W

SEC source: 0001616707-26-000162 · wk-form4_1789593603.xml · nonDerivative · entry 1

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 355,652

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 $97.80 to $98.67, 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: 0001616707-26-000160 · wk-form4_1789072041.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 110,376

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 June 9, 2026.

SEC source: 0001616707-26-000152 · wk-form4_1786749767.xml · nonDerivative · entry 1

JUNG ANDREA · CIK 0001051401 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,154

F1 · shares: These shares of Class A Common Stock are issuable upon vesting of restricted stock units ("RSUs"). These RSUs vest upon the satisfaction of a service condition. The service condition is satisfied as to 1/4th of the shares on November 1, 2026 and as to an additional 1/4th of the shares for each three-month period of continuous service thereafter.

SEC source: 0001616707-26-000154 · wk-form4_1786749874.xml · nonDerivative · entry 1

King Jeremy · CIK 0001874500 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,965

F1 · shares: These shares of Class A Common Stock are issuable upon vesting of restricted stock units ("RSUs"). These RSUs vest upon the satisfaction of a service condition. The service condition is satisfied as to 1/4th of the shares on November 1, 2026 and as to an additional 1/4th of the shares for each three-month period of continuous service thereafter.

SEC source: 0001616707-26-000158 · wk-form4_1786750340.xml · nonDerivative · entry 5

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 360,137

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.

SEC source: 0001616707-26-000158 · wk-form4_1786750340.xml · nonDerivative · entry 4

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 360,192

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 $104.39 to $105.33, 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: 0001616707-26-000158 · wk-form4_1786750340.xml · nonDerivative · entry 3

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 371,716

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 $103.39 to $104.38, 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: 0001616707-26-000158 · wk-form4_1786750340.xml · nonDerivative · entry 2

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 396,853

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 $102.39 to $103.38, 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: 0001616707-26-000158 · wk-form4_1786750340.xml · nonDerivative · entry 1

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 420,112

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 $101.39 to $102.38, 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: 0001616707-26-000156 · wk-form4_1786750198.xml · nonDerivative · entry 5

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 360,073

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 $105.42 to $105.43, 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: 0001616707-26-000156 · wk-form4_1786750198.xml · nonDerivative · entry 4

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 360,248

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 $104.39 to $105.33, 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: 0001616707-26-000156 · wk-form4_1786750198.xml · nonDerivative · entry 3

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 371,496

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 $103.39 to $104.38, 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: 0001616707-26-000156 · wk-form4_1786750198.xml · nonDerivative · entry 2

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 395,100

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 $102.39 to $103.38, 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: 0001616707-26-000156 · wk-form4_1786750198.xml · nonDerivative · entry 1

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 420,349

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 $101.39 to $102.38, 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: 0001616707-26-000127 · wk-form4_1783371247.xml · nonDerivative · entry 5

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 117,344

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 August 12, 2025.

SEC source: 0001616707-26-000131 · wk-form4_1783371373.xml · derivative · entry 6

Tan Fiona · CIK 0001867558 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 81,219

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.

F3 · 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 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 October 1, 2026, 27,073 shares will vest on January 1, 2027, and 27,073 shares will vest on April 1, 2027.

F5 · 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 October 1, 2026, 27,073 shares will vest on January 1, 2027, and 27,073 shares will vest on April 1, 2027.

SEC source: 0001616707-26-000131 · wk-form4_1783371373.xml · derivative · entry 5

Tan Fiona · CIK 0001867558 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,597

Underlying: Class A Common Stock · 1,198 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.

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, 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 October 1, 2026, 1,199 shares will vest on January 1, 2027, and 1,199 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, 1,199 shares will vest on October 1, 2026, 1,199 shares will vest on January 1, 2027, and 1,199 shares will vest on April 1, 2027.

SEC source: 0001616707-26-000131 · wk-form4_1783371373.xml · nonDerivative · entry 3

Tan Fiona · CIK 0001867558 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,280

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: 0001616707-26-000131 · wk-form4_1783371373.xml · nonDerivative · entry 2

Tan Fiona · CIK 0001867558 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,637

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: 0001616707-26-000131 · wk-form4_1783371373.xml · nonDerivative · entry 1

Tan Fiona · CIK 0001867558 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,564

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: 0001616707-26-000129 · wk-form4_1783371310.xml · derivative · entry 9

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 67,286

Underlying: Class A Common Stock · 22,428 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.

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, 22,429 shares will vest on October 1, 2026, 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, 22,429 shares will vest on October 1, 2026, 22,428 shares will vest on January 1, 2027, and 22,429 shares will vest on April 1, 2027.

SEC source: 0001616707-26-000129 · wk-form4_1783371310.xml · derivative · entry 8

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,284

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 October 1, 2026, 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 October 1, 2026, 428 shares will vest on January 1, 2027, and 428 shares will vest on April 1, 2027.

SEC source: 0001616707-26-000129 · wk-form4_1783371310.xml · derivative · entry 7

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 657

Underlying: Class A Common Stock · 218 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 October 1, 2026, 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 October 1, 2026, 219 shares will vest on January 1, 2027, and 219 shares will vest on April 1, 2027.

SEC source: 0001616707-26-000129 · wk-form4_1783371310.xml · derivative · entry 6

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 392

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. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 392 shares will vest 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. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 392 shares will vest on October 1, 2026.

SEC source: 0001616707-26-000129 · wk-form4_1783371310.xml · nonDerivative · entry 5

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 171,190

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: 0001616707-26-000129 · wk-form4_1783371310.xml · nonDerivative · entry 4

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 182,537

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: 0001616707-26-000129 · wk-form4_1783371310.xml · nonDerivative · entry 3

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 160,109

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: 0001616707-26-000129 · wk-form4_1783371310.xml · nonDerivative · entry 2

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 159,681

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: 0001616707-26-000129 · wk-form4_1783371310.xml · nonDerivative · entry 1

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 159,463

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: 0001616707-26-000127 · wk-form4_1783371247.xml · derivative · entry 9

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 68,826

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 October 1, 2026, 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 October 1, 2026, 22,942 shares will vest on January 1, 2027, and 22,942 shares will vest on April 1, 2027.

SEC source: 0001616707-26-000127 · wk-form4_1783371247.xml · derivative · entry 8

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 547

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 October 1, 2026, 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 October 1, 2026, 182 shares will vest on January 1, 2027, and 183 shares will vest on April 1, 2027.

SEC source: 0001616707-26-000127 · wk-form4_1783371247.xml · derivative · entry 7

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 327

Underlying: Class A Common Stock · 326 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. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 327 shares will vest 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. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 327 shares will vest on October 1, 2026.

SEC source: 0001616707-26-000127 · wk-form4_1783371247.xml · nonDerivative · entry 4

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 123,269

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: 0001616707-26-000127 · wk-form4_1783371247.xml · nonDerivative · entry 3

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 134,608

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: 0001616707-26-000127 · wk-form4_1783371247.xml · nonDerivative · entry 2

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 111,666

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: 0001616707-26-000127 · wk-form4_1783371247.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 111,484

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: 0001950170-26-000003 · wk-form4_1777926257.xml · derivative · entry 1

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 89,714

Underlying: Class A Common Stock · 89,714 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, which were granted on May 1, 2026, vest upon the satisfaction of a service condition and have no expiration date. Subject to continued service on each applicable vesting date, 22,428 shares will vest on July 1, 2026, 22,429 shares will vest on October 1, 2026, 22,428 shares will vest on January 1, 2027, and 22,429 shares will vest on April 1, 2027.

F2 · 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. Subject to continued service on each applicable vesting date, 22,428 shares will vest on July 1, 2026, 22,429 shares will vest on October 1, 2026, 22,428 shares will vest on January 1, 2027, and 22,429 shares will vest on April 1, 2027.

SEC source: 0001994593-26-000003 · wk-form4_1777926195.xml · derivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 91,768

Underlying: Class A Common Stock · 91,768 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, which were granted on May 1, 2026, vest upon the satisfaction of a service condition and have no expiration date. Subject to continued service on each applicable vesting date, 22,942 shares will vest on July 1, 2026, 22,942 shares will vest on October 1, 2026, 22,942 shares will vest on January 1, 2027, and 22,942 shares will vest on April 1, 2027.

F2 · 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. Subject to continued service on each applicable vesting date, 22,942 shares will vest on July 1, 2026, 22,942 shares will vest on October 1, 2026, 22,942 shares will vest on January 1, 2027, and 22,942 shares will vest on April 1, 2027.

SEC source: 0001867558-26-000005 · wk-form4_1777926136.xml · derivative · entry 1

Tan Fiona · CIK 0001867558 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 108,292

Underlying: Class A Common Stock · 108,292 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, which were granted on May 1, 2026, vest upon the satisfaction of a service condition and have no expiration date. Subject to continued service on each applicable vesting date, 27,073 shares will vest on July 1, 2026, 27,073 shares will vest on October 1, 2026, 27,073 shares will vest on January 1, 2027, and 27,073 shares will vest on April 1, 2027.

F2 · 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. Subject to continued service on each applicable vesting date, 27,073 shares will vest on July 1, 2026, 27,073 shares will vest on October 1, 2026, 27,073 shares will vest on January 1, 2027, and 27,073 shares will vest on April 1, 2027.

SEC source: 0001616707-26-000099 · wk-form4_1777325245.xml · nonDerivative · entry 8

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 429,137

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 29, 2025.

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.33 to $79.61, 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: 0001616707-26-000099 · wk-form4_1777325245.xml · nonDerivative · entry 7

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 429,537

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 29, 2025.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $78.31 to $79.27, 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: 0001616707-26-000099 · wk-form4_1777325245.xml · nonDerivative · entry 6

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 434,674

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 29, 2025.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $77.01 to $77.97, 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: 0001616707-26-000101 · wk-form4_1777325295.xml · nonDerivative · entry 8

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 429,073

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 29, 2025.

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.03 to $79.60, 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: 0001616707-26-000101 · wk-form4_1777325295.xml · nonDerivative · entry 7

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 429,773

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 29, 2025.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $78.02 to $78.87, 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: 0001616707-26-000101 · wk-form4_1777325295.xml · nonDerivative · entry 6

Conine Steven · CIK 0001620052 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 435,612

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 29, 2025.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $77.00 to $77.97, 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: 0001616707-26-000099 · wk-form4_1777325245.xml · nonDerivative · entry 5

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 435,274

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 29, 2025.

SEC source: 0001616707-26-000099 · wk-form4_1777325245.xml · nonDerivative · entry 4

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 436,023

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 29, 2025.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $78.84 to $79.54, 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: 0001616707-26-000099 · wk-form4_1777325245.xml · nonDerivative · entry 3

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 439,808

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 29, 2025.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $77.77 to $78.67, 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: 0001616707-26-000099 · wk-form4_1777325245.xml · nonDerivative · entry 2

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 479,285

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 29, 2025.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $76.77 to $77.76, 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: 0001616707-26-000099 · wk-form4_1777325245.xml · nonDerivative · entry 1

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 532,421

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 29, 2025.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $75.77 to $76.76, 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.