W

SEC source: 0001616707-26-000006 · wk-form4_1767661544.xml · nonDerivative · entry 2

Tan Fiona · CIK 0001867558 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,276

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: 0001616707-26-000006 · wk-form4_1767661544.xml · nonDerivative · entry 1

Tan Fiona · CIK 0001867558 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,635

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: 0001616707-26-000002 · wk-form4_1767661394.xml · derivative · entry 10

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 18,001 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.

F3 · 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 December 21, 2025, vest upon the satisfaction of a service condition and have no expiration date. The service condition was fully satisfied on January 1, 2026.

F7 · derivative.expiration_date: These RSUs, which were granted on December 21, 2025, vest upon the satisfaction of a service condition and have no expiration date. The service condition was fully satisfied on January 1, 2026.

SEC source: 0001616707-26-000002 · wk-form4_1767661394.xml · derivative · entry 9

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,296

Underlying: Class A Common Stock · 584 shares

Expires not disclosed

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

F3 · 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 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, 584 shares will vest on April 1, 2026, and an aggregate amount of 1,712 shares will vest in equal quarterly amounts commencing July 1, 2026.

F6 · 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, 584 shares will vest on April 1, 2026, and an aggregate amount of 1,712 shares will vest in equal quarterly amounts commencing July 1, 2026.

SEC source: 0001616707-26-000002 · wk-form4_1767661394.xml · derivative · entry 8

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,092

Underlying: Class A Common Stock · 217 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 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, 217 shares will vest on April 1, 2026, and an aggregate amount of 875 shares will vest in substantially equal quarterly amounts commencing July 1, 2026.

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, 217 shares will vest on April 1, 2026, and an aggregate amount of 875 shares will vest in substantially equal quarterly amounts commencing July 1, 2026.

SEC source: 0001616707-26-000002 · wk-form4_1767661394.xml · derivative · entry 7

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,176

Underlying: Class A Common Stock · 391 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 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 each of April 1, 2026, July 1, 2026, and October 1, 2026.

F4 · 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 each of April 1, 2026, July 1, 2026, and October 1, 2026.

SEC source: 0001616707-26-000002 · wk-form4_1767661394.xml · nonDerivative · entry 5

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 185,735

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: 0001616707-26-000002 · wk-form4_1767661394.xml · nonDerivative · entry 4

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 194,690

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: 0001616707-26-000002 · wk-form4_1767661394.xml · nonDerivative · entry 3

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 176,689

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: 0001616707-26-000002 · wk-form4_1767661394.xml · nonDerivative · entry 2

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 176,105

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: 0001616707-26-000002 · wk-form4_1767661394.xml · nonDerivative · entry 1

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 175,888

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: 0001616707-25-000163 · wk-form4_1767046654.xml · nonDerivative · entry 6

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 439,137

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.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $102.00 to $102.78, 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.

SEC source: 0001616707-25-000165 · wk-form4_1767046856.xml · nonDerivative · entry 6

Conine Steven · CIK 0001620052 · Director · Co-Founder

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 439,073

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.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $102.00 to $102.88, 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: 0001616707-25-000163 · wk-form4_1767046654.xml · nonDerivative · entry 5

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 469,137

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.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $101.61 to $101.76, 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: 0001616707-25-000163 · wk-form4_1767046654.xml · nonDerivative · entry 4

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 473,953

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 $100.61 to $101.60, 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: 0001616707-25-000163 · wk-form4_1767046654.xml · nonDerivative · entry 3

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 506,049

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 $99.61 to $100.60, 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: 0001616707-25-000163 · wk-form4_1767046654.xml · nonDerivative · entry 2

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 564,697

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 $98.61 to $99.60, 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: 0001616707-25-000163 · wk-form4_1767046654.xml · nonDerivative · entry 1

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 584,601

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 $97.60 to $98.59, 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: 0001616707-25-000165 · wk-form4_1767046856.xml · nonDerivative · entry 5

Conine Steven · CIK 0001620052 · Director · Co-Founder

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 469,073

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.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $101.60 to $101.74, 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: 0001616707-25-000165 · wk-form4_1767046856.xml · nonDerivative · entry 4

Conine Steven · CIK 0001620052 · Director · Co-Founder

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 475,268

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 $100.60 to $101.59, 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: 0001616707-25-000165 · wk-form4_1767046856.xml · nonDerivative · entry 3

Conine Steven · CIK 0001620052 · Director · Co-Founder

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 506,086

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 $99.60 to $100.59, 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: 0001616707-25-000165 · wk-form4_1767046856.xml · nonDerivative · entry 2

Conine Steven · CIK 0001620052 · Director · Co-Founder

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 565,766

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 $98.60 to $99.59, 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: 0001616707-25-000165 · wk-form4_1767046856.xml · nonDerivative · entry 1

Conine Steven · CIK 0001620052 · Director · Co-Founder

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 584,519

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 $97.60 to $98.59, 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: 0001616707-25-000161 · wk-form4_1766444336.xml · derivative · entry 1

Tan Fiona · CIK 0001867558 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,641

Underlying: Class A Common Stock · 21,641 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 fully satisfied on January 1, 2026.

F2 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is fully satisfied on January 1, 2026.

SEC source: 0001616707-25-000159 · wk-form4_1766444215.xml · derivative · entry 1

Gulliver Kate · CIK 0001950170 · CFO and Chief Admin Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,001

Underlying: Class A Common Stock · 18,001 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 fully satisfied on January 1, 2026.

F2 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is fully satisfied on January 1, 2026.

SEC source: 0001616707-25-000157 · wk-form4_1766444103.xml · derivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,702

Underlying: Class A Common Stock · 18,702 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 fully satisfied on January 1, 2026.

F2 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and have no expiration date. The service condition is fully satisfied on January 1, 2026.

SEC source: 0001616707-26-000083 · wk-form4a_1774993495.xml · nonDerivative · entry 2

Kumin Michael Andrew · CIK 0001368414 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 316,577

F1 · kind: The previous Form 4 filed in respect of the listed transaction is being amended to indicate that 56,000 shares were transferred from TOF Capital to the reporting person such that the shares are now held directly by the reporting person in his individual capacity.

SEC source: 0001616707-26-000083 · wk-form4a_1774993495.xml · nonDerivative · entry 1

Kumin Michael Andrew · CIK 0001368414 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By TOF Capital

Disclosed balance after: 0

F1 · kind: The previous Form 4 filed in respect of the listed transaction is being amended to indicate that 56,000 shares were transferred from TOF Capital to the reporting person such that the shares are now held directly by the reporting person in his individual capacity.

F2 · ownership.nature: The reporting person is the managing member of TOF Capital, which directly owns the reported securities.

SEC source: 0001620093-25-000042 · wk-form4_1764194812.xml · derivative · entry 9

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 9,134,496

Underlying: Class A Common Stock · 740,000 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.

F1 · derivative.exercise_price: On November 24, 2025, the reporting person converted, at his election, 740,000 shares of his Class B Common Stock into Class A Common Stock. 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.

F1 · derivative.exercise_date: On November 24, 2025, the reporting person converted, at his election, 740,000 shares of his Class B Common Stock into Class A Common Stock. 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.

F1 · derivative.expiration_date: On November 24, 2025, the reporting person converted, at his election, 740,000 shares of his Class B Common Stock into Class A Common Stock. 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.

SEC source: 0001620093-25-000042 · wk-form4_1764194812.xml · nonDerivative · entry 7

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 589,137

F8 · kind: These shares were transferred to the Shah Charitable Foundation.

SEC source: 0001620093-25-000042 · wk-form4_1764194812.xml · nonDerivative · entry 6

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 619,137

F7 · kind: These shares were transferred to a donor advised fund.

SEC source: 0001620093-25-000042 · wk-form4_1764194812.xml · nonDerivative · entry 5

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 729,137

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 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 $107.48 to $107.82, 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: 0001620093-25-000042 · wk-form4_1764194812.xml · nonDerivative · entry 4

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 731,265

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 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 $106.47 to $107.46, 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: 0001620093-25-000042 · wk-form4_1764194812.xml · nonDerivative · entry 3

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 759,811

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 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 $105.47 to $106.46, 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: 0001620093-25-000042 · wk-form4_1764194812.xml · nonDerivative · entry 2

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 840,166

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 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 $104.47 to $105.46, 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: 0001620093-25-000042 · wk-form4_1764194812.xml · nonDerivative · entry 1

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 879,137

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: On November 24, 2025, the reporting person converted, at his election, 740,000 shares of his Class B Common Stock into Class A Common Stock. 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.

SEC source: 0001620052-25-000042 · wk-form4_1764194923.xml · derivative · entry 9

Conine Steven · CIK 0001620052 · Director · Co-Founder

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 9,133,304

Underlying: Class A Common Stock · 740,000 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.

F1 · derivative.exercise_price: On November 24, 2025, the reporting person converted, at his election, 740,000 shares of his Class B Common Stock into Class A Common Stock. 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.

F1 · derivative.exercise_date: On November 24, 2025, the reporting person converted, at his election, 740,000 shares of his Class B Common Stock into Class A Common Stock. 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.

F1 · derivative.expiration_date: On November 24, 2025, the reporting person converted, at his election, 740,000 shares of his Class B Common Stock into Class A Common Stock. 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.

SEC source: 0001620052-25-000042 · wk-form4_1764194923.xml · nonDerivative · entry 7

Conine Steven · CIK 0001620052 · Director · Co-Founder

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 589,073

F8 · kind: These shares were transferred to the Conine Family Foundation.

SEC source: 0001620052-25-000042 · wk-form4_1764194923.xml · nonDerivative · entry 6

Conine Steven · CIK 0001620052 · Director · Co-Founder

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 619,073

F7 · kind: These shares were transferred to a donor advised fund.

SEC source: 0001620052-25-000042 · wk-form4_1764194923.xml · nonDerivative · entry 5

Conine Steven · CIK 0001620052 · Director · Co-Founder

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 729,073

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 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 $107.50 to $107.82, 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: 0001620052-25-000042 · wk-form4_1764194923.xml · nonDerivative · entry 4

Conine Steven · CIK 0001620052 · Director · Co-Founder

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 731,298

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 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 $106.50 to $107.49, 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: 0001620052-25-000042 · wk-form4_1764194923.xml · nonDerivative · entry 3

Conine Steven · CIK 0001620052 · Director · Co-Founder

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 760,181

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 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 $105.50 to $106.49, 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: 0001620052-25-000042 · wk-form4_1764194923.xml · nonDerivative · entry 2

Conine Steven · CIK 0001620052 · Director · Co-Founder

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 836,951

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 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 $104.50 to $105.49, 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: 0001620052-25-000042 · wk-form4_1764194923.xml · nonDerivative · entry 1

Conine Steven · CIK 0001620052 · Director · Co-Founder

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 879,073

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: On November 24, 2025, the reporting person converted, at his election, 740,000 shares of his Class B Common Stock into Class A Common Stock. 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.

SEC source: 0001616707-25-000145 · wk-form4_1763157392.xml · nonDerivative · entry 1

Sneed Michael E · CIK 0001745939 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,543

F1 · shares: These shares of Class A Common Stock are issuable upon vesting of a restricted stock unit ("RSU"). The RSUs vest upon the satisfaction of a service condition over a one year period commencing on November 1, 2025. The service condition is satisfied as to 1/4th of the shares on February 1, 2025 and as to an additional 1/4th of the shares for each three-month period of continuous service thereafter.

SEC source: 0001616707-25-000147 · wk-form4_1763157559.xml · nonDerivative · entry 1

Lawton III Harry A · CIK 0001647222 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,261

F1 · shares: These shares of Class A Common Stock are issuable upon vesting of a restricted stock unit ("RSU"). The RSUs vest upon the satisfaction of a service condition over a one year period commencing on November 1, 2025. The service condition is satisfied as to 1/4th of the shares on February 1, 2025 and as to an additional 1/4th of the shares for each three-month period of continuous service thereafter.

SEC source: 0001616707-25-000143 · wk-form4_1762983860.xml · nonDerivative · entry 3

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 100,856

F2 · kind: These shares were transferred to a donor advised fund.

SEC source: 0001616707-25-000143 · wk-form4_1762983860.xml · nonDerivative · entry 2

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 101,019

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 August 12, 2025.

SEC source: 0001616707-25-000143 · wk-form4_1762983860.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 104,670

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 August 12, 2025.

SEC source: 0001616707-25-000141 · wk-form4_1762983642.xml · nonDerivative · entry 2

Tan Fiona · CIK 0001867558 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Indirect · By Revocable Trust

Disclosed balance after: 209,328

F1 · 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 August 5, 2025.