W

SEC source: 0001616707-18-000130 · wf-form4_152123100161693.xml · derivative · entry 11

Mulliken John Champlin · CIK 0001620147 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,000

Underlying: Class A Common Stock · 2,500 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.

F6 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Class A Common Stock when vested.

F7 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition. The service condition is satisfied as to 20% of the shares on March 15, 2016 and as to an additional 5% of the shares for each 3-month period of continuous service thereafter.

F7 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition. The service condition is satisfied as to 20% of the shares on March 15, 2016 and as to an additional 5% of the shares for each 3-month period of continuous service thereafter.

SEC source: 0001616707-18-000130 · wf-form4_152123100161693.xml · derivative · entry 10

Mulliken John Champlin · CIK 0001620147 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 2,001 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 Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · price: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · derivative.exercise_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · derivative.expiration_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

SEC source: 0001616707-18-000130 · wf-form4_152123100161693.xml · derivative · entry 9

Mulliken John Champlin · CIK 0001620147 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,001

Underlying: Class A Common Stock · 2,001 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 Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · price: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · derivative.exercise_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · derivative.expiration_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

SEC source: 0001616707-18-000130 · wf-form4_152123100161693.xml · derivative · entry 8

Mulliken John Champlin · CIK 0001620147 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class B Common Stock · 2,001 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 RSU represents a contingent right to receive one share of Class B Common Stock when vested.

F5 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition and an event condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on March 15, 2014 and as to an additional 1/60th of the shares for each month of continuous service thereafter. The event condition was satisfied on the closing of the issuer's initial public offering of Class A Common Stock.

F5 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and an event condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on March 15, 2014 and as to an additional 1/60th of the shares for each month of continuous service thereafter. The event condition was satisfied on the closing of the issuer's initial public offering of Class A Common Stock.

SEC source: 0001616707-18-000130 · wf-form4_152123100161693.xml · nonDerivative · entry 6

Mulliken John Champlin · CIK 0001620147 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,232

F2 · kind: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of the RSUs listed in Table II and does not represent a discretionary trade by the reporting person.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $82.05 to $82.30, inclusive. The reporting person undertakes to provide to Wayfair Inc., any security holder of Wayfair Inc., 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 this footnote.

SEC source: 0001616707-18-000130 · wf-form4_152123100161693.xml · nonDerivative · entry 5

Mulliken John Champlin · CIK 0001620147 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,667

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: 0001616707-18-000130 · wf-form4_152123100161693.xml · nonDerivative · entry 4

Mulliken John Champlin · CIK 0001620147 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,667

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: 0001616707-18-000130 · wf-form4_152123100161693.xml · nonDerivative · entry 3

Mulliken John Champlin · CIK 0001620147 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,667

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: 0001616707-18-000130 · wf-form4_152123100161693.xml · nonDerivative · entry 2

Mulliken John Champlin · CIK 0001620147 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,215

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: 0001616707-18-000130 · wf-form4_152123100161693.xml · nonDerivative · entry 1

Mulliken John Champlin · CIK 0001620147 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,715

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 Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

SEC source: 0001616707-18-000128 · wf-form4_152123095589465.xml · derivative · entry 13

Oblak Steve · CIK 0001620159 · Chief Merchandising Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,000

Underlying: Class A Common Stock · 10,000 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.

F6 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Class A Common Stock when vested.

F10 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition and an event condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on March 15, 2018 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

F10 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and an event condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on March 15, 2018 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

SEC source: 0001616707-18-000128 · wf-form4_152123095589465.xml · derivative · entry 12

Oblak Steve · CIK 0001620159 · Chief Merchandising Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 60,000

Underlying: Class A Common Stock · 5,000 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.

F6 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Class A Common Stock when vested.

F9 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on March 15, 2017 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

F9 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on March 15, 2017 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

SEC source: 0001616707-18-000128 · wf-form4_152123095589465.xml · derivative · entry 11

Oblak Steve · CIK 0001620159 · Chief Merchandising Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,433

Underlying: Class A Common Stock · 243 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.

F6 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Class A Common Stock when vested.

F8 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on September 15, 2016 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

F8 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on September 15, 2016 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

SEC source: 0001616707-18-000128 · wf-form4_152123095589465.xml · derivative · entry 10

Oblak Steve · CIK 0001620159 · Chief Merchandising Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,000

Underlying: Class A Common Stock · 2,500 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.

F6 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Class A Common Stock when vested.

F7 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition. The service condition is satisfied as to 20% of the shares on March 15, 2016 and as to an additional 5% of the shares for each 3-month period of continuous service thereafter.

F7 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition. The service condition is satisfied as to 20% of the shares on March 15, 2016 and as to an additional 5% of the shares for each 3-month period of continuous service thereafter.

SEC source: 0001616707-18-000128 · wf-form4_152123095589465.xml · derivative · entry 9

Oblak Steve · CIK 0001620159 · Chief Merchandising Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 834 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 Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · price: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · derivative.exercise_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · derivative.expiration_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

SEC source: 0001616707-18-000128 · wf-form4_152123095589465.xml · derivative · entry 8

Oblak Steve · CIK 0001620159 · Chief Merchandising Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 834

Underlying: Class A Common Stock · 834 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 Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · price: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · derivative.exercise_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · derivative.expiration_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

SEC source: 0001616707-18-000128 · wf-form4_152123095589465.xml · derivative · entry 7

Oblak Steve · CIK 0001620159 · Chief Merchandising Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class B Common Stock · 834 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 RSU represents a contingent right to receive one share of Class B Common Stock when vested.

F5 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition and an event condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on March 15, 2014 and as to an additional 1/60th of the shares for each month of continuous service thereafter. The event condition was satisfied on the closing of the issuer's initial public offering of Class A Common Stock.

F5 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and an event condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on March 15, 2014 and as to an additional 1/60th of the shares for each month of continuous service thereafter. The event condition was satisfied on the closing of the issuer's initial public offering of Class A Common Stock.

SEC source: 0001616707-18-000128 · wf-form4_152123095589465.xml · nonDerivative · entry 6

Oblak Steve · CIK 0001620159 · Chief Merchandising Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 138,322

F2 · kind: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of the RSUs listed in Table II and does not represent a discretionary trade by the reporting person.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $83.06 to $83.85, inclusive. The reporting person undertakes to provide to Wayfair Inc., any security holder of Wayfair Inc., 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 this footnote.

SEC source: 0001616707-18-000128 · wf-form4_152123095589465.xml · nonDerivative · entry 5

Oblak Steve · CIK 0001620159 · Chief Merchandising Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 146,967

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: 0001616707-18-000128 · wf-form4_152123095589465.xml · nonDerivative · entry 4

Oblak Steve · CIK 0001620159 · Chief Merchandising Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 136,967

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: 0001616707-18-000128 · wf-form4_152123095589465.xml · nonDerivative · entry 3

Oblak Steve · CIK 0001620159 · Chief Merchandising Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 131,967

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: 0001616707-18-000128 · wf-form4_152123095589465.xml · nonDerivative · entry 2

Oblak Steve · CIK 0001620159 · Chief Merchandising Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 131,724

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: 0001616707-18-000128 · wf-form4_152123095589465.xml · nonDerivative · entry 1

Oblak Steve · CIK 0001620159 · Chief Merchandising Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 129,224

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 Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

SEC source: 0001616707-18-000126 · wf-form4_152123092203916.xml · derivative · entry 13

Savarese James · CIK 0001620005 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,000

Underlying: Class A Common Stock · 10,000 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.

F6 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Class A Common Stock when vested.

F10 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition and an event condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on March 15, 2018 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

F10 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and an event condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on March 15, 2018 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

SEC source: 0001616707-18-000126 · wf-form4_152123092203916.xml · derivative · entry 12

Savarese James · CIK 0001620005 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 60,000

Underlying: Class A Common Stock · 5,000 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.

F6 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Class A Common Stock when vested.

F9 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on March 15, 2017 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

F9 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on March 15, 2017 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

SEC source: 0001616707-18-000126 · wf-form4_152123092203916.xml · derivative · entry 11

Savarese James · CIK 0001620005 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,210

Underlying: Class A Common Stock · 521 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.

F6 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Class A Common Stock when vested.

F8 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on September 15, 2016 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

F8 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on September 15, 2016 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

SEC source: 0001616707-18-000126 · wf-form4_152123092203916.xml · derivative · entry 10

Savarese James · CIK 0001620005 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,000

Underlying: Class A Common Stock · 1,500 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.

F6 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Class A Common Stock when vested.

F7 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition. The service condition is satisfied as to 20% of the shares on March 15, 2016 and as to an additional 5% of the shares for each 3-month period of continuous service thereafter.

F7 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition. The service condition is satisfied as to 20% of the shares on March 15, 2016 and as to an additional 5% of the shares for each 3-month period of continuous service thereafter.

SEC source: 0001616707-18-000126 · wf-form4_152123092203916.xml · derivative · entry 9

Savarese James · CIK 0001620005 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 2,501 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 Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · price: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · derivative.exercise_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · derivative.expiration_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

SEC source: 0001616707-18-000126 · wf-form4_152123092203916.xml · derivative · entry 8

Savarese James · CIK 0001620005 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,501

Underlying: Class A Common Stock · 2,501 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 Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · price: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · derivative.exercise_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · derivative.expiration_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

SEC source: 0001616707-18-000126 · wf-form4_152123092203916.xml · derivative · entry 7

Savarese James · CIK 0001620005 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class B Common Stock · 2,501 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 RSU represents a contingent right to receive one share of Class B Common Stock when vested.

F5 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition and an event condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on March 15, 2014 and as to an additional 1/60th of the shares for each month of continuous service thereafter. The event condition was satisfied on the closing of the issuer's initial public offering of Class A Common Stock.

F5 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and an event condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on March 15, 2014 and as to an additional 1/60th of the shares for each month of continuous service thereafter. The event condition was satisfied on the closing of the issuer's initial public offering of Class A Common Stock.

SEC source: 0001616707-18-000126 · wf-form4_152123092203916.xml · nonDerivative · entry 6

Savarese James · CIK 0001620005 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 546,676

F2 · kind: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of the RSUs listed in Table II and does not represent a discretionary trade by the reporting person.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $83.21 to $84.17, inclusive. The reporting person undertakes to provide to Wayfair Inc., any security holder of Wayfair Inc., 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 this footnote.

SEC source: 0001616707-18-000126 · wf-form4_152123092203916.xml · nonDerivative · entry 5

Savarese James · CIK 0001620005 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 555,723

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: 0001616707-18-000126 · wf-form4_152123092203916.xml · nonDerivative · entry 4

Savarese James · CIK 0001620005 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 545,723

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: 0001616707-18-000126 · wf-form4_152123092203916.xml · nonDerivative · entry 3

Savarese James · CIK 0001620005 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 540,723

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: 0001616707-18-000126 · wf-form4_152123092203916.xml · nonDerivative · entry 2

Savarese James · CIK 0001620005 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 540,202

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: 0001616707-18-000126 · wf-form4_152123092203916.xml · nonDerivative · entry 1

Savarese James · CIK 0001620005 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 538,702

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 Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

SEC source: 0001616707-18-000127 · wf-form4_152123093900621.xml · nonDerivative · entry 1

FLEISHER MICHAEL D · CIK 0001187596 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 61,024

F1 · kind: These shares were transferred to The Hotchkiss School.

SEC source: 0001616707-18-000116 · wf-form4_152106384016722.xml · nonDerivative · entry 1

Macri Edmond · CIK 0001620023 · Chief Product/Marketing

10b5-1 filing: Not disclosed

Ownership: Indirect · By Revocable Trust

Disclosed balance after: 243,949

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $84.99 to $85.41, inclusive. The reporting person undertakes to provide to Wayfair Inc., any security holder of Wayfair Inc., 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 this footnote.

SEC source: 0001616707-18-000116 · wf-form4_152106384016722.xml · derivative · entry 3

Macri Edmond · CIK 0001620023 · Chief Product/Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 60,000

Underlying: Class A Common Stock · 60,000 shares

Expires not disclosed

F3 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Class A Common Stock when vested.

F4 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/20th of the shares on April 15, 2018 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

F4 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/20th of the shares on April 15, 2018 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

SEC source: 0001616707-18-000115 · wf-form4_152106380643116.xml · derivative · entry 1

FLEISHER MICHAEL D · CIK 0001187596 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 275,000

Underlying: Class A Common Stock · 275,000 shares

Expires not disclosed

F1 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Class A Common Stock when vested.

F2 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/20th of the shares on April 15, 2018 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

F2 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/20th of the shares on April 15, 2018 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

SEC source: 0001616707-18-000118 · wf-form4_152106389026421.xml · derivative · entry 2

Oblak Steve · CIK 0001620159 · Chief Merchandising Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 60,000

Underlying: Class A Common Stock · 60,000 shares

Expires not disclosed

F3 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Class A Common Stock when vested.

F4 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/20th of the shares on April 15, 2018 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

F4 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/20th of the shares on April 15, 2018 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

SEC source: 0001616707-18-000118 · wf-form4_152106389026421.xml · nonDerivative · entry 1

Oblak Steve · CIK 0001620159 · Chief Merchandising Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 128,390

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $86.72 to $86.99, inclusive. The reporting person undertakes to provide to Wayfair Inc., any security holder of Wayfair Inc., 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 this footnote.

SEC source: 0001616707-18-000117 · wf-form4_152106387092846.xml · derivative · entry 1

Savarese James · CIK 0001620005 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 80,000

Underlying: Class A Common Stock · 80,000 shares

Expires not disclosed

F1 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Class A Common Stock when vested.

F2 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/20th of the shares on April 15, 2018 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

F2 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/20th of the shares on April 15, 2018 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

SEC source: 0001616707-18-000114 · wf-form4_152106377417423.xml · derivative · entry 3

Mulliken John Champlin · CIK 0001620147 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 60,000

Underlying: Class A Common Stock · 60,000 shares

Expires not disclosed

F2 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Class A Common Stock when vested.

F3 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/20th of the shares on April 15, 2018 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

F3 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is satisfied as to 1/20th of the shares on April 15, 2018 and as to an additional 1/20th of the shares for every three months of continuous service thereafter.

SEC source: 0000899243-18-006978 · doc4.xml · nonDerivative · entry 3

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES LLC · CIK 0001620785 · see remarks

HARBOURVEST PARTNERS 2007 DIRECT FUND L.P. · CIK 0001620787 · see remarks

HARBOURVEST PARTNERS LLC · CIK 0001201001 · see remarks

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES L.P. · CIK 0001620789 · see remarks

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES LLC · CIK 0001620788 · see remarks

HarbourVest Partners VIII-Venture Fund L.P. · CIK 0001620790 · see remarks

HarbourVest Partners/NYSTRS Co-Investment Fund L.P. · CIK 0001620791 · see remarks

HIPEP VI Select Associates L.P. · CIK 0001620817 · see remarks

HIPEP VI Select Associates LLC · CIK 0001620816 · see remarks

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 222,206

F7 · price: This transaction was executed in multiple trades at prices ranging from $85.00 to $85.19 per share inclusive. The price reported above reflects the weighted average sale price. The reporting persons hereby undertake to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and the prices at which the transaction was effected.

F5 · ownership.direct: These securities are owned solely by HarbourVest Partners 2007 Direct Fund L.P. ("HV Direct"). HarbourVest Partners, LLC is the managing member of HarbourVest 2007 Direct Associates LLC, which is the general partner of HarbourVest 2007 Direct Associates L.P., which is the general partner of HV Direct. Each of HarbourVest Partners, LLC, HarbourVest 2007 Direct Associates LLC and HarbourVest 2007 Direct Associates L.P. may be deemed to have a beneficial interest in the securities held by HV Direct and each disclaims beneficial ownership of the securities held by HV Direct, except to the extent of its pecuniary interest which is subject to indeterminable future events.

F6 · ownership.direct: Each of HV Co-Invest, HIPEP VI Select Associates LLC, HIPEP VI Select Associates L.P., HV Ventures, HarbourVest VIII-Venture Associates LLC, HarbourVest VIII-Venture Associates L.P., HV9 (as defined below), HarbourVest IX-Venture Associates LLC, and HarbourVest IX-Venture Associates L.P disclaims beneficial ownership of the securities held by HV Direct and this report shall not be deemed an admission that any such reporting person is the beneficial owner of such securities for purposes of Section 16 of the Securities Exchange Act or for any other purpose.

SEC source: 0000899243-18-006978 · doc4.xml · nonDerivative · entry 2

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES LLC · CIK 0001620785 · see remarks

HARBOURVEST PARTNERS 2007 DIRECT FUND L.P. · CIK 0001620787 · see remarks

HARBOURVEST PARTNERS LLC · CIK 0001201001 · see remarks

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES L.P. · CIK 0001620789 · see remarks

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES LLC · CIK 0001620788 · see remarks

HarbourVest Partners VIII-Venture Fund L.P. · CIK 0001620790 · see remarks

HarbourVest Partners/NYSTRS Co-Investment Fund L.P. · CIK 0001620791 · see remarks

HIPEP VI Select Associates L.P. · CIK 0001620817 · see remarks

HIPEP VI Select Associates LLC · CIK 0001620816 · see remarks

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 111,104

F7 · price: This transaction was executed in multiple trades at prices ranging from $85.00 to $85.19 per share inclusive. The price reported above reflects the weighted average sale price. The reporting persons hereby undertake to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and the prices at which the transaction was effected.

F3 · ownership.direct: These securities are owned solely by HarbourVest/NYSTRS Co-Invest Fund L.P. ("HV Co-Invest"). HarbourVest Partners, LLC is the managing member of HIPEP VI Select Associates LLC, which is the general partner of HIPEP VI Select Associates L.P., which is the general partner of HV Co-Invest. Each of HarbourVest Partners, LLC, HIPEP VI Select Associates LLC and HIPEP VI Select Associates L.P. may be deemed to have a beneficial interest in the securities held by HV Co-Invest and each disclaims beneficial ownership of the securities held by HV Co-Invest, except to the extent of its pecuniary interest which is subject to indeterminable future events.

F4 · ownership.direct: Each of HV Ventures, HarbourVest VIII-Venture Associates LLC, HarbourVest VIII-Venture Associates L.P., HV Direct, HarbourVest 2007 Direct Associates LLC, HarbourVest 2007 Direct Associates L.P., HV9 (as defined below), HarbourVest IX-Venture Associates LLC, and HarbourVest IX-Venture Associates L.P disclaims beneficial ownership of the securities held by HV Co-Invest and this report shall not be deemed an admission that any such reporting person is the beneficial owner of such securities for purposes of Section 16 of the Securities Exchange Act or for any other purpose.

SEC source: 0000899243-18-006978 · doc4.xml · nonDerivative · entry 1

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES LLC · CIK 0001620785 · see remarks

HARBOURVEST PARTNERS 2007 DIRECT FUND L.P. · CIK 0001620787 · see remarks

HARBOURVEST PARTNERS LLC · CIK 0001201001 · see remarks

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES L.P. · CIK 0001620789 · see remarks

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES LLC · CIK 0001620788 · see remarks

HarbourVest Partners VIII-Venture Fund L.P. · CIK 0001620790 · see remarks

HarbourVest Partners/NYSTRS Co-Investment Fund L.P. · CIK 0001620791 · see remarks

HIPEP VI Select Associates L.P. · CIK 0001620817 · see remarks

HIPEP VI Select Associates LLC · CIK 0001620816 · see remarks

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 111,104

F7 · price: This transaction was executed in multiple trades at prices ranging from $85.00 to $85.19 per share inclusive. The price reported above reflects the weighted average sale price. The reporting persons hereby undertake to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and the prices at which the transaction was effected.

F1 · ownership.direct: These securities are owned solely by HarbourVest Partners VIII-Venture Fund, L.P. ("HV Ventures"). HarbourVest Partners, LLC is the managing member of HarbourVest VIII-Venture Associates LLC, which is the general partner of HarbourVest VIII-Venture Associates L.P., which is the general partner of HV Ventures. Each of HarbourVest Partners, LLC, HarbourVest VIII-Venture Associates LLC and HarbourVest VIII-Venture Associates L.P. may be deemed to have a beneficial interest in the securities held by HV Ventures and each disclaims beneficial ownership of the securities held by HV Ventures, except to the extent of its pecuniary interest which is subject to indeterminable future events.

F2 · ownership.direct: Each of HV Co-Invest (as defined below), HIPEP VI Select Associates LLC, HIPEP VI Select Associates L.P., HV Direct (as defined below), HarbourVest 2007 Direct Associates LLC, HarbourVest 2007 Direct Associates L.P., HV9 (as defined below), HarbourVest IX-Venture Associates LLC, and HarbourVest IX-Venture Associates L.P,. disclaims beneficial ownership of the securities held by HV Ventures and this report shall not be deemed an admission that any such reporting person is the beneficial owner of such securities for purposes of Section 16 of the Securities Exchange Act or for any other purpose.

SEC source: 0001616707-18-000108 · wf-form4_152042076536173.xml · nonDerivative · entry 1

Macri Edmond · CIK 0001620023 · Chief Product/Marketing

10b5-1 filing: Not disclosed

Ownership: Indirect · By Revocable Trust

Disclosed balance after: 244,549

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001616707-18-000114 · wf-form4_152106377417423.xml · nonDerivative · entry 2

Mulliken John Champlin · CIK 0001620147 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By Revocable Trust

Disclosed balance after: 178,447

F1 · kind: Represents a transfer to a revocable trust. The reporting person is the trustee of the revocable trust.

SEC source: 0001616707-18-000114 · wf-form4_152106377417423.xml · nonDerivative · entry 1

Mulliken John Champlin · CIK 0001620147 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,714

F1 · kind: Represents a transfer to a revocable trust. The reporting person is the trustee of the revocable trust.