REPL

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 18

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 2,386,172

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F16 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.07 to $45.06 inclusive.

F3 · balance_after: The shares reported herein give effect to the pro rata distribution of shares by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X") for no additional consideration to its limited and general partner, Atlas Venture Associates X, L.P. ("AVA X LP") subsequent to the Reporting Person's last Section 16 filing reporting ownership of the Issuer's Common Stock. As the distributions of such shares constituted only a change in the form of the Reporting Person's indirect ownership in such shares, the Reporting Person was not required to report these distributions pursuant to Section 16.

F4 · ownership.nature: The shares are held directly by Atlas Venture Fund X. The general partner of Atlas Venture Fund X is AVA X LP. Atlas Venture Associates X, LLC ("AVA X LLC") is the general partner of AVA X LP. The Reporting Person is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 17

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 2,393,502

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F15 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $42.97 to $43.94 inclusive.

F3 · balance_after: The shares reported herein give effect to the pro rata distribution of shares by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X") for no additional consideration to its limited and general partner, Atlas Venture Associates X, L.P. ("AVA X LP") subsequent to the Reporting Person's last Section 16 filing reporting ownership of the Issuer's Common Stock. As the distributions of such shares constituted only a change in the form of the Reporting Person's indirect ownership in such shares, the Reporting Person was not required to report these distributions pursuant to Section 16.

F4 · ownership.nature: The shares are held directly by Atlas Venture Fund X. The general partner of Atlas Venture Fund X is AVA X LP. Atlas Venture Associates X, LLC ("AVA X LLC") is the general partner of AVA X LP. The Reporting Person is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 16

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 2,411,385

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F14 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $41.95 to $42.91 inclusive.

F3 · balance_after: The shares reported herein give effect to the pro rata distribution of shares by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X") for no additional consideration to its limited and general partner, Atlas Venture Associates X, L.P. ("AVA X LP") subsequent to the Reporting Person's last Section 16 filing reporting ownership of the Issuer's Common Stock. As the distributions of such shares constituted only a change in the form of the Reporting Person's indirect ownership in such shares, the Reporting Person was not required to report these distributions pursuant to Section 16.

F4 · ownership.nature: The shares are held directly by Atlas Venture Fund X. The general partner of Atlas Venture Fund X is AVA X LP. Atlas Venture Associates X, LLC ("AVA X LLC") is the general partner of AVA X LP. The Reporting Person is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001104659-20-134933 · tm2038101-4_4seq1.xml · nonDerivative · entry 5

Astley-Sparke Philip · CIK 0001376491 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,330,297

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on November 6, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F6 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $42.29 to $41.78. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

SEC source: 0001104659-20-134933 · tm2038101-4_4seq1.xml · nonDerivative · entry 4

Astley-Sparke Philip · CIK 0001376491 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,331,097

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on November 6, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F5 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $43.40 to $42.48. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

SEC source: 0001104659-20-134933 · tm2038101-4_4seq1.xml · nonDerivative · entry 3

Astley-Sparke Philip · CIK 0001376491 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,342,213

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on November 6, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F4 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.40 to $43.42. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

SEC source: 0001104659-20-134933 · tm2038101-4_4seq1.xml · nonDerivative · entry 2

Astley-Sparke Philip · CIK 0001376491 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,348,672

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on November 6, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F3 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.40 to $44.41. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

SEC source: 0001104659-20-134933 · tm2038101-4_4seq1.xml · nonDerivative · entry 1

Astley-Sparke Philip · CIK 0001376491 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,354,697

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on November 6, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F2 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.47 to $45.56. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

SEC source: 0001104659-20-134932 · tm2038101-3_4seq1.xml · nonDerivative · entry 5

Love Colin · CIK 0001376493 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 976,524

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on June 12, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F6 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $42.28 to $41.65. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

F7 · balance_after: Following the sales reported on this Form 4, the reporting person continues to beneficially own 976,524 shares of the Issuer's common stock. The reporting person also holds options to acquire 444,653 shares of the Issuer's common stock, 215,521 of which are exercisable as of the date hereof.

SEC source: 0001104659-20-134932 · tm2038101-3_4seq1.xml · nonDerivative · entry 4

Love Colin · CIK 0001376493 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 977,524

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on June 12, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F5 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $43.37 to $42.48. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

SEC source: 0001104659-20-134932 · tm2038101-3_4seq1.xml · nonDerivative · entry 3

Love Colin · CIK 0001376493 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 991,274

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on June 12, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F4 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.37 to $43.39. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

SEC source: 0001104659-20-134932 · tm2038101-3_4seq1.xml · nonDerivative · entry 2

Love Colin · CIK 0001376493 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 998,332

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on June 12, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F3 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.38 to $44.40. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

SEC source: 0001104659-20-134932 · tm2038101-3_4seq1.xml · nonDerivative · entry 1

Love Colin · CIK 0001376493 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,005,824

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on June 12, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F2 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.47 to $45.56. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

SEC source: 0001104659-20-133815 · tm2038101-2_4seq1.xml · derivative · entry 3

SLATTERY JOSEPH P · CIK 0001246530 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,640

Underlying: Common Stock · 5,200 shares

Expires 2027-10-01

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_date: 25% of the shares underlying this stock option vested on October 1, 2018 and the remainder of the shares underlying this stock option vest in 36 equal monthly installments thereafter.

SEC source: 0001104659-20-133815 · tm2038101-2_4seq1.xml · nonDerivative · entry 2

SLATTERY JOSEPH P · CIK 0001246530 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,667

SEC source: 0001104659-20-133815 · tm2038101-2_4seq1.xml · nonDerivative · entry 1

SLATTERY JOSEPH P · CIK 0001246530 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,867

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.

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 15

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 32,234

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F13 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.55 to $47.45 inclusive.

F3 · balance_after: The shares reported herein give effect to the pro rata distribution of shares by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X") for no additional consideration to its limited and general partner, Atlas Venture Associates X, L.P. ("AVA X LP") subsequent to the Reporting Person's last Section 16 filing reporting ownership of the Issuer's Common Stock. As the distributions of such shares constituted only a change in the form of the Reporting Person's indirect ownership in such shares, the Reporting Person was not required to report these distributions pursuant to Section 16.

F11 · ownership.nature: The shares are held directly by AVA X LP. The Reporting Person is a member of AVA X LLC and disclaims beneficial ownership of such securities held by AVA X LP, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 14

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 35,103

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F12 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.52 to $46.42 inclusive.

F3 · balance_after: The shares reported herein give effect to the pro rata distribution of shares by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X") for no additional consideration to its limited and general partner, Atlas Venture Associates X, L.P. ("AVA X LP") subsequent to the Reporting Person's last Section 16 filing reporting ownership of the Issuer's Common Stock. As the distributions of such shares constituted only a change in the form of the Reporting Person's indirect ownership in such shares, the Reporting Person was not required to report these distributions pursuant to Section 16.

F11 · ownership.nature: The shares are held directly by AVA X LP. The Reporting Person is a member of AVA X LLC and disclaims beneficial ownership of such securities held by AVA X LP, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 13

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,003,356

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F13 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.55 to $47.45 inclusive.

F8 · ownership.nature: The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("Atlas Venture Opportunity Fund I"). The general partner of Atlas Venture Opportunity Fund I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") is the general partner of AVAO I LP. The Reporting Person is a member of AVAO I LLC and disclaims beneficial ownership of such securities held by Atlas Venture Opportunity Fund I, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 12

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,048,383

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F12 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.52 to $46.42 inclusive.

F8 · ownership.nature: The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("Atlas Venture Opportunity Fund I"). The general partner of Atlas Venture Opportunity Fund I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") is the general partner of AVAO I LP. The Reporting Person is a member of AVAO I LLC and disclaims beneficial ownership of such securities held by Atlas Venture Opportunity Fund I, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 11

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 2,413,130

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F13 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.55 to $47.45 inclusive.

F3 · balance_after: The shares reported herein give effect to the pro rata distribution of shares by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X") for no additional consideration to its limited and general partner, Atlas Venture Associates X, L.P. ("AVA X LP") subsequent to the Reporting Person's last Section 16 filing reporting ownership of the Issuer's Common Stock. As the distributions of such shares constituted only a change in the form of the Reporting Person's indirect ownership in such shares, the Reporting Person was not required to report these distributions pursuant to Section 16.

F4 · ownership.nature: The shares are held directly by Atlas Venture Fund X. The general partner of Atlas Venture Fund X is AVA X LP. Atlas Venture Associates X, LLC ("AVA X LLC") is the general partner of AVA X LP. The Reporting Person is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 10

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 2,446,263

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F12 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.52 to $46.42 inclusive.

F3 · balance_after: The shares reported herein give effect to the pro rata distribution of shares by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X") for no additional consideration to its limited and general partner, Atlas Venture Associates X, L.P. ("AVA X LP") subsequent to the Reporting Person's last Section 16 filing reporting ownership of the Issuer's Common Stock. As the distributions of such shares constituted only a change in the form of the Reporting Person's indirect ownership in such shares, the Reporting Person was not required to report these distributions pursuant to Section 16.

F4 · ownership.nature: The shares are held directly by Atlas Venture Fund X. The general partner of Atlas Venture Fund X is AVA X LP. Atlas Venture Associates X, LLC ("AVA X LLC") is the general partner of AVA X LP. The Reporting Person is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001104659-20-133812 · tm2038101-1_4seq1.xml · derivative · entry 5

Dhingra Kapil · CIK 0001456849 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,169

Underlying: Common Stock · 40,000 shares

Expires 2026-01-21

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_date: The shares underlying this option vested on January 21, 2016.

SEC source: 0001104659-20-133812 · tm2038101-1_4seq1.xml · nonDerivative · entry 4

Dhingra Kapil · CIK 0001456849 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F3 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.85 to $47.21. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

SEC source: 0001104659-20-133812 · tm2038101-1_4seq1.xml · nonDerivative · entry 3

Dhingra Kapil · CIK 0001456849 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,802

F2 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.85 to $46.84. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

SEC source: 0001104659-20-133812 · tm2038101-1_4seq1.xml · nonDerivative · entry 2

Dhingra Kapil · CIK 0001456849 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,325

F1 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.84 to $45.82. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

SEC source: 0001104659-20-133812 · tm2038101-1_4seq1.xml · nonDerivative · entry 1

Dhingra Kapil · CIK 0001456849 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,000

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.

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 9

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 35,709

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.71 to $47.19 inclusive.

F3 · balance_after: The shares reported herein give effect to the pro rata distribution of shares by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X") for no additional consideration to its limited and general partner, Atlas Venture Associates X, L.P. ("AVA X LP") subsequent to the Reporting Person's last Section 16 filing reporting ownership of the Issuer's Common Stock. As the distributions of such shares constituted only a change in the form of the Reporting Person's indirect ownership in such shares, the Reporting Person was not required to report these distributions pursuant to Section 16.

F11 · ownership.nature: The shares are held directly by AVA X LP. The Reporting Person is a member of AVA X LLC and disclaims beneficial ownership of such securities held by AVA X LP, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 8

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 35,815

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.71 to $46.67 inclusive.

F3 · balance_after: The shares reported herein give effect to the pro rata distribution of shares by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X") for no additional consideration to its limited and general partner, Atlas Venture Associates X, L.P. ("AVA X LP") subsequent to the Reporting Person's last Section 16 filing reporting ownership of the Issuer's Common Stock. As the distributions of such shares constituted only a change in the form of the Reporting Person's indirect ownership in such shares, the Reporting Person was not required to report these distributions pursuant to Section 16.

F11 · ownership.nature: The shares are held directly by AVA X LP. The Reporting Person is a member of AVA X LLC and disclaims beneficial ownership of such securities held by AVA X LP, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 7

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 37,822

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.71 to $45.708 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2), (5), (6), (7), (9), (10), (12), (13), (14), (15), (16) and (17).

F3 · balance_after: The shares reported herein give effect to the pro rata distribution of shares by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X") for no additional consideration to its limited and general partner, Atlas Venture Associates X, L.P. ("AVA X LP") subsequent to the Reporting Person's last Section 16 filing reporting ownership of the Issuer's Common Stock. As the distributions of such shares constituted only a change in the form of the Reporting Person's indirect ownership in such shares, the Reporting Person was not required to report these distributions pursuant to Section 16.

F11 · ownership.nature: The shares are held directly by AVA X LP. The Reporting Person is a member of AVA X LLC and disclaims beneficial ownership of such securities held by AVA X LP, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 6

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,068,003

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F10 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.71 to $47.23 inclusive.

F8 · ownership.nature: The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("Atlas Venture Opportunity Fund I"). The general partner of Atlas Venture Opportunity Fund I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") is the general partner of AVAO I LP. The Reporting Person is a member of AVAO I LLC and disclaims beneficial ownership of such securities held by Atlas Venture Opportunity Fund I, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 5

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,070,325

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.71 to $46.68 inclusive.

F8 · ownership.nature: The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("Atlas Venture Opportunity Fund I"). The general partner of Atlas Venture Opportunity Fund I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") is the general partner of AVAO I LP. The Reporting Person is a member of AVAO I LLC and disclaims beneficial ownership of such securities held by Atlas Venture Opportunity Fund I, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 4

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,097,038

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.71 to $45.70 inclusive.

F8 · ownership.nature: The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("Atlas Venture Opportunity Fund I"). The general partner of Atlas Venture Opportunity Fund I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") is the general partner of AVAO I LP. The Reporting Person is a member of AVAO I LLC and disclaims beneficial ownership of such securities held by Atlas Venture Opportunity Fund I, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 3

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 2,453,264

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.71 to $47.19 inclusive.

F3 · balance_after: The shares reported herein give effect to the pro rata distribution of shares by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X") for no additional consideration to its limited and general partner, Atlas Venture Associates X, L.P. ("AVA X LP") subsequent to the Reporting Person's last Section 16 filing reporting ownership of the Issuer's Common Stock. As the distributions of such shares constituted only a change in the form of the Reporting Person's indirect ownership in such shares, the Reporting Person was not required to report these distributions pursuant to Section 16.

F4 · ownership.nature: The shares are held directly by Atlas Venture Fund X. The general partner of Atlas Venture Fund X is AVA X LP. Atlas Venture Associates X, LLC ("AVA X LLC") is the general partner of AVA X LP. The Reporting Person is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 2

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 2,454,486

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.71 to $46.67 inclusive.

F3 · balance_after: The shares reported herein give effect to the pro rata distribution of shares by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X") for no additional consideration to its limited and general partner, Atlas Venture Associates X, L.P. ("AVA X LP") subsequent to the Reporting Person's last Section 16 filing reporting ownership of the Issuer's Common Stock. As the distributions of such shares constituted only a change in the form of the Reporting Person's indirect ownership in such shares, the Reporting Person was not required to report these distributions pursuant to Section 16.

F4 · ownership.nature: The shares are held directly by Atlas Venture Fund X. The general partner of Atlas Venture Fund X is AVA X LP. Atlas Venture Associates X, LLC ("AVA X LLC") is the general partner of AVA X LP. The Reporting Person is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001209191-20-062624 · doc4.xml · nonDerivative · entry 1

Rhodes Jason P · CIK 0001577014 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 2,477,660

F1 · kind: Shares were sold pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.71 to $45.708 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2), (5), (6), (7), (9), (10), (12), (13), (14), (15), (16) and (17).

F3 · balance_after: The shares reported herein give effect to the pro rata distribution of shares by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X") for no additional consideration to its limited and general partner, Atlas Venture Associates X, L.P. ("AVA X LP") subsequent to the Reporting Person's last Section 16 filing reporting ownership of the Issuer's Common Stock. As the distributions of such shares constituted only a change in the form of the Reporting Person's indirect ownership in such shares, the Reporting Person was not required to report these distributions pursuant to Section 16.

F4 · ownership.nature: The shares are held directly by Atlas Venture Fund X. The general partner of Atlas Venture Fund X is AVA X LP. Atlas Venture Associates X, LLC ("AVA X LLC") is the general partner of AVA X LP. The Reporting Person is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001104659-20-126992 · a4.xml · nonDerivative · entry 3

Love Colin · CIK 0001376493 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,006,524

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on June 12, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F4 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.63 to $44.05. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

F5 · balance_after: Following the sales reported on this Form 4, the reporting person continues to beneficially own 1,006,524 shares of the Issuer's common stock. The reporting person also holds options to acquire 444,653 shares of the Issuer's common stock, 208,687 of which are exercisable as of the date hereof.

SEC source: 0001104659-20-126992 · a4.xml · nonDerivative · entry 2

Love Colin · CIK 0001376493 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,010,283

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on June 12, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F3 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.63 to $44.64. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

SEC source: 0001104659-20-126992 · a4.xml · nonDerivative · entry 1

Love Colin · CIK 0001376493 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,021,224

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on June 12, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F2 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.73 to $46.09. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

SEC source: 0001104659-20-120937 · a4.xml · derivative · entry 1

Lewis Tanya · CIK 0001451038 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 33,000

Underlying: Common Stock · 33,000 shares

Expires 2030-11-02

F1 · derivative.exercise_date: 25% of the shares underlying this stock option vest on November 2, 2021, and the remainder of the shares underlying this stock option vest in 24 approximately equal monthly installments thereafter.

SEC source: 0001104659-20-115710 · a4.xml · derivative · entry 4

Esposito Pamela · CIK 0001744425 · Chief Business Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 128,203

Underlying: Common Stock · 16,000 shares

Expires 2025-11-01

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_date: The reporting person was granted an option to purchase 149,203 shares of the Issuer's common stock on November 1, 2015. All of the shares underlying the stock option have vested and are exercisable as of the date hereof.

SEC source: 0001104659-20-115710 · a4.xml · nonDerivative · entry 3

Esposito Pamela · CIK 0001744425 · Chief Business Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 112,700

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on June 15, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F3 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $35.00 to $35.20.

F4 · balance_after: Following the sales reported on this Form 4, the reporting person continues to beneficially own 112,700 shares of the Issuer's common stock. The reporting person also holds options to acquire an aggregate of 577,146 shares of the Issuer's common stock, 384,273 of which are exercisable as of the date hereof.

SEC source: 0001104659-20-115710 · a4.xml · nonDerivative · entry 2

Esposito Pamela · CIK 0001744425 · Chief Business Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 121,700

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on June 15, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F2 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.00 to $30.57.

SEC source: 0001104659-20-115710 · a4.xml · nonDerivative · entry 1

Esposito Pamela · CIK 0001744425 · Chief Business Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 128,700

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.

SEC source: 0001209191-20-050942 · doc4.xml · nonDerivative · entry 1

Atlas Venture Fund X, L.P. · CIK 0001628098 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,486,296

F1 · kind: Represent a pro rata distribution, and not a purchase or sale of securities, by Atlas Venture Fund X, L.P. to its general partner and limited partners without additional consideration. This distribution was effected pursuant to a plan adopted in accordance with Rule 10b5-1 on February 28, 2020.

SEC source: 0001104659-20-106117 · a4.xml · nonDerivative · entry 3

Love Colin · CIK 0001376493 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,021,524

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on June 12, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F4 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.70 to $25.00.

F5 · balance_after: Following the sales reported on this Form 4, the reporting person continues to beneficially own 1,021,524 shares of the Issuer's common stock. The reporting person also holds options to acquire 444,653 shares of the Issuer's common stock, 195,019 of which are exercisable as of the date hereof.

SEC source: 0001104659-20-106117 · a4.xml · nonDerivative · entry 2

Love Colin · CIK 0001376493 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,023,053

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on June 12, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F3 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.68 to $24.67.

SEC source: 0001104659-20-106117 · a4.xml · nonDerivative · entry 1

Love Colin · CIK 0001376493 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,033,324

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on June 12, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F2 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.60 to $23.57.

SEC source: 0001104659-20-101464 · a4.xml · derivative · entry 3

Esposito Pamela · CIK 0001744425 · Chief Business Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 144,203

Underlying: Common Stock · 5,000 shares

Expires 2025-11-01

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_date: The reporting person was granted an option to purchase 149,203 shares of the Issuer's common stock on November 1, 2015. All of the shares underlying the stock option have vested and are exercisable as of the date hereof.

SEC source: 0001104659-20-101464 · a4.xml · nonDerivative · entry 2

Esposito Pamela · CIK 0001744425 · Chief Business Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 112,700

F1 · kind: The sales reported on this Form 4 were made by the reporting person pursuant to a trading plan adopted on June 15, 2020 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

F2 · price: The price reported reflects a weighted average price. These shares were sold in multiple transactions at prices ranging from $27.00 to $27.18.

F3 · balance_after: Following the sales reported on this Form 4, the reporting person continues to beneficially own 112,700 shares of the Issuer's common stock. The reporting person also holds options to acquire an aggregate of 593,146 shares of the Issuer's common stock, 394,440 of which are exercisable as of the date hereof.