W

SEC source: 0001616707-26-000174 · wk-form4_1792012878.xml · nonDerivative · entry 5

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 222,137

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $107.26 to $107.37, 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: 0001616707-26-000174 · wk-form4_1792012878.xml · nonDerivative · entry 4

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 222,731

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $106.23 to $107.22, 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: 0001616707-26-000174 · wk-form4_1792012878.xml · nonDerivative · entry 3

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 238,328

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $105.23 to $106.22, 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: 0001616707-26-000174 · wk-form4_1792012878.xml · nonDerivative · entry 2

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 277,436

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $104.23 to $105.22, 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: 0001616707-26-000174 · wk-form4_1792012878.xml · nonDerivative · entry 1

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 286,087

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $103.23 to $104.20, 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: 0001616707-26-000172 · wk-form4_1792012820.xml · nonDerivative · entry 5

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 222,073

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $107.26 to $107.37, 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: 0001616707-26-000172 · wk-form4_1792012820.xml · nonDerivative · entry 4

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 222,667

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $106.23 to $107.22, 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: 0001616707-26-000172 · wk-form4_1792012820.xml · nonDerivative · entry 3

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 238,266

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $105.23 to $106.22, 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: 0001616707-26-000172 · wk-form4_1792012820.xml · nonDerivative · entry 2

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 277,372

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $104.23 to $105.22, 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: 0001616707-26-000172 · wk-form4_1792012820.xml · nonDerivative · entry 1

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 286,023

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $103.23 to $104.20, 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: 0001616707-26-000166 · wk-form4_1791240753.xml · nonDerivative · entry 5

Blotner Jon · CIK 0001994593 · Pres., Commercial & Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 116,431

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 9, 2026.

SEC source: 0001616707-26-000170 · wk-form4_1791240900.xml · derivative · entry 6

Tan Fiona · CIK 0001867558 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 54,146

Underlying: Class A Common Stock · 27,073 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 A Common Stock when vested.

F6 · derivative.exercise_date: These RSUs, which were granted on May 1, 2026, vest upon the satisfaction of a service condition and have no expiration date. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 27,073 shares will vest on January 1, 2027, and 27,073 shares will vest on April 1, 2027.

F6 · derivative.expiration_date: These RSUs, which were granted on May 1, 2026, vest upon the satisfaction of a service condition and have no expiration date. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 27,073 shares will vest on January 1, 2027, and 27,073 shares will vest on April 1, 2027.

SEC source: 0001616707-26-000170 · wk-form4_1791240900.xml · derivative · entry 5

Tan Fiona · CIK 0001867558 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,398

Underlying: Class A Common Stock · 1,199 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 A Common Stock when vested.

F5 · derivative.exercise_date: These RSUs, which were granted on April 18, 2022, vest upon the satisfaction of a service condition and have no expiration date. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 1,199 shares will vest on January 1, 2027, and 1,199 shares will vest on April 1, 2027.

F5 · derivative.expiration_date: These RSUs, which were granted on April 18, 2022, vest upon the satisfaction of a service condition and have no expiration date. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 1,199 shares will vest on January 1, 2027, and 1,199 shares will vest on April 1, 2027.

SEC source: 0001616707-26-000170 · wk-form4_1791240900.xml · nonDerivative · entry 4

Tan Fiona · CIK 0001867558 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Indirect · By Revocable Trust

Disclosed balance after: 204,698

F2 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on behalf of the revocable trust, as trustee, on June 1, 2026.

F3 · ownership.direct: The reporting person is the trustee of the revocable trust, and members of the reporting person's immediate family are the sole beneficiaries of the revocable trust.

SEC source: 0001616707-26-000170 · wk-form4_1791240900.xml · nonDerivative · entry 3

Tan Fiona · CIK 0001867558 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 39,195

F1 · shares: These shares represent the number of shares of Class A Common Stock withheld by the issuer to satisfy the reporting person's tax withholding obligation upon the vesting of the RSUs reported in this Form 4.

SEC source: 0001616707-26-000170 · wk-form4_1791240900.xml · nonDerivative · entry 2

Tan Fiona · CIK 0001867558 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 53,552

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: 0001616707-26-000170 · wk-form4_1791240900.xml · nonDerivative · entry 1

Tan Fiona · CIK 0001867558 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 26,479

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: 0001616707-26-000168 · wk-form4_1791240824.xml · derivative · entry 9

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,857

Underlying: Class A Common Stock · 22,429 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.

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

F6 · derivative.exercise_date: These RSUs, which were granted on May 1, 2026, vest upon the satisfaction of a service condition and have no expiration date. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 22,428 shares will vest on January 1, 2027, and 22,429 shares will vest on April 1, 2027.

F6 · derivative.expiration_date: These RSUs, which were granted on May 1, 2026, vest upon the satisfaction of a service condition and have no expiration date. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 22,428 shares will vest on January 1, 2027, and 22,429 shares will vest on April 1, 2027.

SEC source: 0001616707-26-000168 · wk-form4_1791240824.xml · derivative · entry 8

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 856

Underlying: Class A Common Stock · 428 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.

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

F5 · derivative.exercise_date: These RSUs, which were granted on February 1, 2023, vest upon the satisfaction of a service condition and have no expiration date. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 428 shares will vest on January 1, 2027, and 428 shares will vest on April 1, 2027.

F5 · derivative.expiration_date: These RSUs, which were granted on February 1, 2023, vest upon the satisfaction of a service condition and have no expiration date. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 428 shares will vest on January 1, 2027, and 428 shares will vest on April 1, 2027.

SEC source: 0001616707-26-000168 · wk-form4_1791240824.xml · derivative · entry 7

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 438

Underlying: Class A Common Stock · 219 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.

F2 · 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, which were granted on April 18, 2022, vest upon the satisfaction of a service condition and have no expiration date. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 219 shares will vest on January 1, 2027, and 219 shares will vest on April 1, 2027.

F4 · derivative.expiration_date: These RSUs, which were granted on April 18, 2022, vest upon the satisfaction of a service condition and have no expiration date. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 219 shares will vest on January 1, 2027, and 219 shares will vest on April 1, 2027.

SEC source: 0001616707-26-000168 · wk-form4_1791240824.xml · derivative · entry 6

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 392 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.

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, which were granted on November 11, 2021, vest upon the satisfaction of a service condition and have no expiration date. The service condition was fully satisfied on October 1, 2026.

F3 · derivative.expiration_date: These RSUs, which were granted on November 11, 2021, vest upon the satisfaction of a service condition and have no expiration date. The service condition was fully satisfied on October 1, 2026.

SEC source: 0001616707-26-000168 · wk-form4_1791240824.xml · nonDerivative · entry 5

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 183,310

F1 · shares: These shares represent the number of shares of Class A Common Stock withheld by the issuer to satisfy the reporting person's tax withholding obligation upon the vesting of the RSUs reported in this Form 4.

SEC source: 0001616707-26-000168 · wk-form4_1791240824.xml · nonDerivative · entry 4

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 194,658

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: 0001616707-26-000168 · wk-form4_1791240824.xml · nonDerivative · entry 3

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 172,229

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: 0001616707-26-000168 · wk-form4_1791240824.xml · nonDerivative · entry 2

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 171,801

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: 0001616707-26-000168 · wk-form4_1791240824.xml · nonDerivative · entry 1

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 171,582

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: 0001616707-26-000166 · wk-form4_1791240753.xml · derivative · entry 9

Blotner Jon · CIK 0001994593 · Pres., Commercial & Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 45,884

Underlying: Class A Common Stock · 22,942 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 A Common Stock when vested.

F7 · derivative.exercise_date: These RSUs, which were granted on May 1, 2026, vest upon the satisfaction of a service condition and have no expiration date. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 22,942 shares will vest on January 1, 2027, and 22,942 shares will vest on April 1, 2027.

F7 · derivative.expiration_date: These RSUs, which were granted on May 1, 2026, vest upon the satisfaction of a service condition and have no expiration date. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 22,942 shares will vest on January 1, 2027, and 22,942 shares will vest on April 1, 2027.

SEC source: 0001616707-26-000166 · wk-form4_1791240753.xml · derivative · entry 8

Blotner Jon · CIK 0001994593 · Pres., Commercial & Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 365

Underlying: Class A Common Stock · 182 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 A Common Stock when vested.

F6 · derivative.exercise_date: These RSUs, which were granted on April 18, 2022, vest upon the satisfaction of a service condition and have no expiration date. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 182 shares will vest on January 1, 2027, and 183 shares will vest on April 1, 2027.

F6 · derivative.expiration_date: These RSUs, which were granted on April 18, 2022, vest upon the satisfaction of a service condition and have no expiration date. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 182 shares will vest on January 1, 2027, and 183 shares will vest on April 1, 2027.

SEC source: 0001616707-26-000166 · wk-form4_1791240753.xml · derivative · entry 7

Blotner Jon · CIK 0001994593 · Pres., Commercial & Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 327 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 A Common Stock when vested.

F5 · derivative.exercise_date: These RSUs, which were granted on November 11, 2021, vest upon the satisfaction of a service condition and have no expiration date. The service condition was fully satisfied on October 1, 2026.

F5 · derivative.expiration_date: These RSUs, which were granted on November 11, 2021, vest upon the satisfaction of a service condition and have no expiration date. The service condition was fully satisfied on October 1, 2026.

SEC source: 0001616707-26-000166 · wk-form4_1791240753.xml · nonDerivative · entry 4

Blotner Jon · CIK 0001994593 · Pres., Commercial & Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 122,487

F1 · shares: These shares represent the number of shares of Class A Common Stock withheld by the issuer to satisfy the reporting person's tax withholding obligation upon the vesting of the RSUs reported in this Form 4.

SEC source: 0001616707-26-000166 · wk-form4_1791240753.xml · nonDerivative · entry 3

Blotner Jon · CIK 0001994593 · Pres., Commercial & Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 133,827

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: 0001616707-26-000166 · wk-form4_1791240753.xml · nonDerivative · entry 2

Blotner Jon · CIK 0001994593 · Pres., Commercial & Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 110,885

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: 0001616707-26-000166 · wk-form4_1791240753.xml · nonDerivative · entry 1

Blotner Jon · CIK 0001994593 · Pres., Commercial & Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 110,703

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: 0001616707-26-000164 · wk-form4_1789593755.xml · nonDerivative · entry 9

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 291,073

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F10 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $105.87 to $106.36, 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: 0001616707-26-000164 · wk-form4_1789593755.xml · nonDerivative · entry 8

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 298,611

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $104.87 to $105.86, 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: 0001616707-26-000164 · wk-form4_1789593755.xml · nonDerivative · entry 7

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 311,419

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $103.87 to $104.86, 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: 0001616707-26-000164 · wk-form4_1789593755.xml · nonDerivative · entry 6

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 330,578

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $102.87 to $103.86, 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: 0001616707-26-000164 · wk-form4_1789593755.xml · nonDerivative · entry 5

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 338,232

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $101.87 to $102.81, 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: 0001616707-26-000164 · wk-form4_1789593755.xml · nonDerivative · entry 4

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 342,334

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $100.85 to $101.82, 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: 0001616707-26-000164 · wk-form4_1789593755.xml · nonDerivative · entry 3

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 345,859

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $99.84 to $100.82, 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: 0001616707-26-000164 · wk-form4_1789593755.xml · nonDerivative · entry 2

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 350,660

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $98.84 to $99.83, 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: 0001616707-26-000164 · wk-form4_1789593755.xml · nonDerivative · entry 1

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 355,556

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $97.82 to $98.80, 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: 0001616707-26-000162 · wk-form4_1789593603.xml · nonDerivative · entry 9

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 291,137

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F10 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $105.85 to $106.35, 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: 0001616707-26-000162 · wk-form4_1789593603.xml · nonDerivative · entry 8

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 298,571

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $104.85 to $105.84, 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: 0001616707-26-000162 · wk-form4_1789593603.xml · nonDerivative · entry 7

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 311,514

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $103.85 to $104.84, 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: 0001616707-26-000162 · wk-form4_1789593603.xml · nonDerivative · entry 6

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 330,888

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $102.85 to $103.84, 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: 0001616707-26-000162 · wk-form4_1789593603.xml · nonDerivative · entry 5

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 338,146

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $101.82 to $102.79, 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: 0001616707-26-000162 · wk-form4_1789593603.xml · nonDerivative · entry 4

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 342,583

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $100.81 to $101.79, 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: 0001616707-26-000162 · wk-form4_1789593603.xml · nonDerivative · entry 3

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 346,362

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $99.81 to $100.80, 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: 0001616707-26-000162 · wk-form4_1789593603.xml · nonDerivative · entry 2

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 351,094

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2026.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $98.80 to $99.78, 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.