Greylock XII GP LLC

SEC source: 0000899243-21-018397 · doc4.xml · nonDerivative · entry 2

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 261,866

F2 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-21-018397 · doc4.xml · nonDerivative · entry 1

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 2,356,842

F1 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-19-024436 · doc4.xml · derivative · entry 16

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 21,155 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.exercise_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.expiration_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.expiration_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F4 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-19-024436 · doc4.xml · derivative · entry 15

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 96,910 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.exercise_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.expiration_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.expiration_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F4 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-19-024436 · doc4.xml · derivative · entry 14

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 64,204 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.exercise_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.expiration_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.expiration_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F4 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-19-024436 · doc4.xml · derivative · entry 13

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 31,084 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.exercise_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.expiration_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.expiration_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F4 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-19-024436 · doc4.xml · derivative · entry 12

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 44,584 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.exercise_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.expiration_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.expiration_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F4 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-19-024436 · doc4.xml · derivative · entry 11

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 10,408 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.exercise_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.expiration_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.expiration_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F4 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-19-024436 · doc4.xml · derivative · entry 10

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 20,117 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.exercise_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.expiration_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.expiration_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F4 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-19-024436 · doc4.xml · derivative · entry 9

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 190,411 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.exercise_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.expiration_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.expiration_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F3 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-19-024436 · doc4.xml · derivative · entry 8

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 872,190 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.exercise_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.expiration_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.expiration_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F3 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-19-024436 · doc4.xml · derivative · entry 7

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 577,865 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.exercise_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.expiration_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.expiration_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F3 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-19-024436 · doc4.xml · derivative · entry 6

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 279,759 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.exercise_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.expiration_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.expiration_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F3 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-19-024436 · doc4.xml · derivative · entry 5

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 401,270 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.exercise_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.expiration_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.expiration_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F3 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-19-024436 · doc4.xml · derivative · entry 4

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 93,680 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.exercise_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.expiration_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.expiration_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F3 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-19-024436 · doc4.xml · derivative · entry 3

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 181,066 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.exercise_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.exercise_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F1 · derivative.expiration_date: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · derivative.expiration_date: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F3 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-19-024436 · doc4.xml · nonDerivative · entry 2

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 288,462

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F4 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-19-024436 · doc4.xml · nonDerivative · entry 1

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 2,596,241

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: In connection with the closing of the issuer's initial public offering on September 30, 2019, each share of the issuer's Series B-1 Preferred Stock automatically converted into 1.1056056 shares of the issuer's Common Stock, each share of the issuer's Series C-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series D-1 Preferred Stock automatically converted into 1.789396 shares of the issuer's Common Stock, each share of the issuer's Series E-1 Preferred Stock automatically converted into 1.9291389 shares of the issuer's Common Stock, each share of the issuer's Series F Preferred Stock automatically converted into 2.697117 shares of the issuer's Common Stock, each share of the issuer's Series F-1 Preferred Stock automatically converted into 1 share of the issuer's Common Stock and each share of the issuer's Series G Preferred Stock automatically converted into 1.48169754117647 shares of the issuer's Common Stock,

F2 · price: (Continued from footnote 1) and such shares had no expiration date. All shares of Common Stock (including fractions thereof) issued upon conversion of more than one share of the issuer's Preferred Stock by a holder thereof were aggregated. No fractional shares were issued upon this conversion.

F3 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-18-005950 · doc4.xml · nonDerivative · entry 2

Greylock XII GP LLC · CIK 0001413877 · Former 10% Owner

Greylock XII Limited Partnership · CIK 0001413950 · Former 10% Owner

Greylock XII-A Limited Partnership · CIK 0001496057 · Former 10% Owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 624,325

F3 · kind: Represents a pro-rata, in-kind distribution by Greylock XII-A Limited Partnership ("Greylock XII-A LP") and its affiliated funds and associated persons, without additional consideration, to their respective partners, members and assigns. Such distribution was made in accordance with the exemption afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F4 · ownership.nature: The shares are held directly by Greylock XII-A LP. Greylock XII GP is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-18-005950 · doc4.xml · nonDerivative · entry 1

Greylock XII GP LLC · CIK 0001413877 · Former 10% Owner

Greylock XII Limited Partnership · CIK 0001413950 · Former 10% Owner

Greylock XII-A Limited Partnership · CIK 0001496057 · Former 10% Owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 5,618,937

F1 · kind: Represents a pro-rata, in-kind distribution by Greylock XII Limited Partnership ("Greylock XII LP") and its affiliated funds and associated persons, without additional consideration, to their respective partners, members and assigns. Such distribution was made in accordance with the exemption afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F2 · ownership.nature: The shares are held directly by Greylock XII LP. Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-023114 · doc4.xml · nonDerivative · entry 2

Greylock XII GP LLC · CIK 0001413877 · Former 10% Owner

Greylock XII Limited Partnership · CIK 0001413950 · Former 10% Owner

Greylock XII-A Limited Partnership · CIK 0001496057 · Former 10% Owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 991,458

F1 · shares: These shares were sold in a firm commitment underwritten public offering pursuant to an underwriting agreement dated as of September 27, 2017 by and between the Issuer, the several underwriters and the selling stockholders identified therein. On September 28, 2017, the underwriters exercised their option under the underwriting agreement to purchase additional shares of Common Stock from the Issuer and the selling stockholders in full.

F3 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP Limited Liability Company is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-023114 · doc4.xml · nonDerivative · entry 1

Greylock XII GP LLC · CIK 0001413877 · Former 10% Owner

Greylock XII Limited Partnership · CIK 0001413950 · Former 10% Owner

Greylock XII-A Limited Partnership · CIK 0001496057 · Former 10% Owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 8,923,172

F1 · shares: These shares were sold in a firm commitment underwritten public offering pursuant to an underwriting agreement dated as of September 27, 2017 by and between the Issuer, the several underwriters and the selling stockholders identified therein. On September 28, 2017, the underwriters exercised their option under the underwriting agreement to purchase additional shares of Common Stock from the Issuer and the selling stockholders in full.

F2 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII Limited Partnership and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-019561 · doc4.xml · derivative · entry 8

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 13,443 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · price: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.exercise_date: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.expiration_date: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F3 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-019561 · doc4.xml · derivative · entry 7

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 26,722 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · price: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.exercise_date: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.expiration_date: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F3 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-019561 · doc4.xml · derivative · entry 6

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 790,785 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · price: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.exercise_date: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.expiration_date: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F3 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-019561 · doc4.xml · derivative · entry 5

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 120,993 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · price: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.exercise_date: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.expiration_date: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F2 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-019561 · doc4.xml · derivative · entry 4

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 240,499 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · price: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.exercise_date: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.expiration_date: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F2 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-019561 · doc4.xml · derivative · entry 3

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 7,117,070 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · price: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.exercise_date: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.expiration_date: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F2 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-019561 · doc4.xml · nonDerivative · entry 2

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 830,950

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F3 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-019561 · doc4.xml · nonDerivative · entry 1

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 7,478,562

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of the issuer's Series D Preferred Stock, Series E Preferred Stock, and Series F Preferred Stock automatically converted into 1 share of the issuer's Common Stock on August 2, 2017 in connection with the closing of the issuer's sale of its Common Stock in its firm commitment initial public offering pursuant to a registration statement on Form S-1 (File No. 333-219093) under the Securities Act of 1933, as amended, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F2 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-012815 · doc4.xml · nonDerivative · entry 2

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 0

F2 · ownership.nature: The shares are held directly by Greylock XII-A LP. Greylock XII GP is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-012815 · doc4.xml · nonDerivative · entry 1

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 0

F1 · ownership.nature: The shares are held directly by Greylock XII LP. Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-011674 · doc4.xml · derivative · entry 10

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 305,466 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.exercise_date: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.expiration_date: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F3 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP Limited Liability Company is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-011674 · doc4.xml · derivative · entry 9

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 2,749,194 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.exercise_date: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.expiration_date: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F2 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII Limited Partnership and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-011674 · doc4.xml · derivative · entry 8

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 143,352 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.exercise_date: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.expiration_date: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F3 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP Limited Liability Company is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-011674 · doc4.xml · derivative · entry 7

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 1,290,196 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.exercise_date: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.expiration_date: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F2 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII Limited Partnership and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-011674 · doc4.xml · derivative · entry 6

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 185,172 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.exercise_date: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.expiration_date: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F3 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP Limited Liability Company is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-011674 · doc4.xml · derivative · entry 5

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 1,666,564 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.exercise_date: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.expiration_date: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F2 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII Limited Partnership and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-011674 · doc4.xml · derivative · entry 4

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 714,978 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.exercise_date: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.expiration_date: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F3 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP Limited Liability Company is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-011674 · doc4.xml · derivative · entry 3

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 0

Underlying: Common Stock · 6,434,806 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.exercise_date: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F1 · derivative.expiration_date: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F2 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII Limited Partnership and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-011674 · doc4.xml · nonDerivative · entry 2

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 1,348,968

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F3 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP Limited Liability Company is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-011674 · doc4.xml · nonDerivative · entry 1

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 12,140,760

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: In connection with the consummation of the Issuer's initial public offering on May 3, 2017, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into one (1) share of Common Stock for no additional consideration, and had no expiration date. All shares of Common Stock issued upon conversion were aggregated.

F2 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII Limited Partnership and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-011236 · doc4.xml · derivative · entry 4

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 489,793

Underlying: Class A Common Stock · 489,793 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. The Class B Common Stock will convert automatically into Class A Common Stock on the same basis upon the earlier of: (i) any transfer, whether or not for value, except for certain transfers to "Permitted Transferees" as defined in the Issuer's restated certificate of incorporation in effect as of the date hereof, (ii) the date on which the Class B Common Stock ceases to represent at least 25% of the Issuer's outstanding common stock, or (iii) the seventh anniversary of the closing of the Issuer's initial public offering.

F5 · derivative.exercise_date: Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. The Class B Common Stock will convert automatically into Class A Common Stock on the same basis upon the earlier of: (i) any transfer, whether or not for value, except for certain transfers to "Permitted Transferees" as defined in the Issuer's restated certificate of incorporation in effect as of the date hereof, (ii) the date on which the Class B Common Stock ceases to represent at least 25% of the Issuer's outstanding common stock, or (iii) the seventh anniversary of the closing of the Issuer's initial public offering.

F5 · derivative.expiration_date: Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. The Class B Common Stock will convert automatically into Class A Common Stock on the same basis upon the earlier of: (i) any transfer, whether or not for value, except for certain transfers to "Permitted Transferees" as defined in the Issuer's restated certificate of incorporation in effect as of the date hereof, (ii) the date on which the Class B Common Stock ceases to represent at least 25% of the Issuer's outstanding common stock, or (iii) the seventh anniversary of the closing of the Issuer's initial public offering.

F4 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-011236 · doc4.xml · derivative · entry 3

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 4,408,144

Underlying: Class A Common Stock · 4,408,144 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. The Class B Common Stock will convert automatically into Class A Common Stock on the same basis upon the earlier of: (i) any transfer, whether or not for value, except for certain transfers to "Permitted Transferees" as defined in the Issuer's restated certificate of incorporation in effect as of the date hereof, (ii) the date on which the Class B Common Stock ceases to represent at least 25% of the Issuer's outstanding common stock, or (iii) the seventh anniversary of the closing of the Issuer's initial public offering.

F5 · derivative.exercise_date: Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. The Class B Common Stock will convert automatically into Class A Common Stock on the same basis upon the earlier of: (i) any transfer, whether or not for value, except for certain transfers to "Permitted Transferees" as defined in the Issuer's restated certificate of incorporation in effect as of the date hereof, (ii) the date on which the Class B Common Stock ceases to represent at least 25% of the Issuer's outstanding common stock, or (iii) the seventh anniversary of the closing of the Issuer's initial public offering.

F5 · derivative.expiration_date: Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. The Class B Common Stock will convert automatically into Class A Common Stock on the same basis upon the earlier of: (i) any transfer, whether or not for value, except for certain transfers to "Permitted Transferees" as defined in the Issuer's restated certificate of incorporation in effect as of the date hereof, (ii) the date on which the Class B Common Stock ceases to represent at least 25% of the Issuer's outstanding common stock, or (iii) the seventh anniversary of the closing of the Issuer's initial public offering.

F3 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-011236 · doc4.xml · nonDerivative · entry 2

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 489,793

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: Represents the conversion of 489,793 shares of Class B Common Stock into 489,793 shares of Class A Common Stock.

F2 · balance_after: Represents the conversion of 489,793 shares of Class B Common Stock into 489,793 shares of Class A Common Stock.

F4 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-011236 · doc4.xml · nonDerivative · entry 1

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 4,408,144

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Represents the conversion of 4,408,144 shares of Class B Common Stock into 4,408,144 shares of Class A Common Stock.

F1 · balance_after: Represents the conversion of 4,408,144 shares of Class B Common Stock into 4,408,144 shares of Class A Common Stock.

F3 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-011447 · doc4.xml · nonDerivative · entry 2

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 300,986

F1 · balance_after: On March 22, 2017, Greylock XII Limited Partnership ("Greylock XII LP") received 10,753 shares of the Issuer's Class A Common Stock and Greylock XII-A Limited Partnership ("Greylock XII-A LP") received 1,193 shares of the Issuer's Class A Common Stock in a pro rata distribution in kind from an unaffiliated venture capital fund in which each of Greylock XII LP and Greylock XII-A LP has a passive limited partner interest. Such pro rata distribution in kind was exempt from Section 16 of the Securities Exchange Act of 1934, as amended, pursuant to Rules 16a-13 and 16a-9 promulgated thereunder.

F3 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-17-011447 · doc4.xml · nonDerivative · entry 1

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 2,708,897

F1 · balance_after: On March 22, 2017, Greylock XII Limited Partnership ("Greylock XII LP") received 10,753 shares of the Issuer's Class A Common Stock and Greylock XII-A Limited Partnership ("Greylock XII-A LP") received 1,193 shares of the Issuer's Class A Common Stock in a pro rata distribution in kind from an unaffiliated venture capital fund in which each of Greylock XII LP and Greylock XII-A LP has a passive limited partner interest. Such pro rata distribution in kind was exempt from Section 16 of the Securities Exchange Act of 1934, as amended, pursuant to Rules 16a-13 and 16a-9 promulgated thereunder.

F2 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-16-030209 · doc4.xml · derivative · entry 12

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII-A Limited Partnership

Disclosed balance after: 489,793

Underlying: Class A Common Stock · 489,793 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_price: Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. The Class B Common Stock will convert automatically into Class A Common Stock on the same basis upon the earlier of: (i) any transfer, whether or not for value, except for certain transfers to "Permitted Transferees" as defined in the Issuer's restated certificate of incorporation in effect as of the date hereof, (ii) the date on which the Class B Common Stock ceases to represent at least 25% of the Issuer's outstanding common stock, or (iii) the seventh anniversary of the closing of the Issuer's initial public offering.

F4 · derivative.exercise_date: Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. The Class B Common Stock will convert automatically into Class A Common Stock on the same basis upon the earlier of: (i) any transfer, whether or not for value, except for certain transfers to "Permitted Transferees" as defined in the Issuer's restated certificate of incorporation in effect as of the date hereof, (ii) the date on which the Class B Common Stock ceases to represent at least 25% of the Issuer's outstanding common stock, or (iii) the seventh anniversary of the closing of the Issuer's initial public offering.

F4 · derivative.expiration_date: Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. The Class B Common Stock will convert automatically into Class A Common Stock on the same basis upon the earlier of: (i) any transfer, whether or not for value, except for certain transfers to "Permitted Transferees" as defined in the Issuer's restated certificate of incorporation in effect as of the date hereof, (ii) the date on which the Class B Common Stock ceases to represent at least 25% of the Issuer's outstanding common stock, or (iii) the seventh anniversary of the closing of the Issuer's initial public offering.

F3 · ownership.nature: The shares are held directly by Greylock XII-A Limited Partnership ("Greylock XII-A LP"). Greylock XII GP is the sole General Partner of Greylock XII-A LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII-A LP. Greylock XII GP disclaims any beneficial ownership of the securities held by Greylock XII-A LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0000899243-16-030209 · doc4.xml · derivative · entry 11

Greylock XII GP LLC · CIK 0001413877 · 10% owner

Greylock XII Limited Partnership · CIK 0001413950 · 10% owner

Greylock XII-A Limited Partnership · CIK 0001496057 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Greylock XII Limited Partnership

Disclosed balance after: 4,408,144

Underlying: Class A Common Stock · 4,408,144 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_price: Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. The Class B Common Stock will convert automatically into Class A Common Stock on the same basis upon the earlier of: (i) any transfer, whether or not for value, except for certain transfers to "Permitted Transferees" as defined in the Issuer's restated certificate of incorporation in effect as of the date hereof, (ii) the date on which the Class B Common Stock ceases to represent at least 25% of the Issuer's outstanding common stock, or (iii) the seventh anniversary of the closing of the Issuer's initial public offering.

F4 · derivative.exercise_date: Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. The Class B Common Stock will convert automatically into Class A Common Stock on the same basis upon the earlier of: (i) any transfer, whether or not for value, except for certain transfers to "Permitted Transferees" as defined in the Issuer's restated certificate of incorporation in effect as of the date hereof, (ii) the date on which the Class B Common Stock ceases to represent at least 25% of the Issuer's outstanding common stock, or (iii) the seventh anniversary of the closing of the Issuer's initial public offering.

F4 · derivative.expiration_date: Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. The Class B Common Stock will convert automatically into Class A Common Stock on the same basis upon the earlier of: (i) any transfer, whether or not for value, except for certain transfers to "Permitted Transferees" as defined in the Issuer's restated certificate of incorporation in effect as of the date hereof, (ii) the date on which the Class B Common Stock ceases to represent at least 25% of the Issuer's outstanding common stock, or (iii) the seventh anniversary of the closing of the Issuer's initial public offering.

F2 · ownership.nature: The shares are held directly by Greylock XII Limited Partnership ("Greylock XII LP"). Greylock XII GP Limited Liability Company ("Greylock XII GP") is the sole General Partner of Greylock XII LP and may be deemed to share voting and dispositive power with respect to the shares held by Greylock XII LP. Greylock XII GP disclaims beneficial ownership of the securities held by Greylock XII LP except to the extent of any pecuniary interest therein and the inclusion of these securities in this report shall not be deemed an admission by Greylock XII GP of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.