X0508 4 2025-11-24 0 0001616707 Wayfair Inc. W 0001620052 Conine Steven C/O WAYFAIR INC., 4 COPLEY PLACE BOSTON MA 02116 1 1 0 0 Co-Founder 1 Class A Common Stock 2025-11-24 4 C 0 740000 0 A 879073 D Class A Common Stock 2025-11-24 4 S 0 42122 105.24 D 836951 D Class A Common Stock 2025-11-24 4 S 0 76770 105.87 D 760181 D Class A Common Stock 2025-11-24 4 S 0 28883 106.92 D 731298 D Class A Common Stock 2025-11-24 4 S 0 2225 107.66 D 729073 D Class A Common Stock 2025-11-24 4 G 0 110000 0 D 619073 D Class A Common Stock 2025-11-24 4 G 0 30000 0 D 589073 D Class A Common Stock 22857 I See Footnote Class B Common Stock 2025-11-24 4 C 0 740000 0 D Class A Common Stock 740000 9133304 D 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. 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. 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. 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. 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. 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. These shares were transferred to a donor advised fund. These shares were transferred to the Conine Family Foundation. Represents shares directly owned by SK Ventures LLC, of which the reporting person is a member and may be deemed to be a beneficial owner. /s/ Enrique Colbert, Attorney-in-Fact for Steven Conine 2025-11-26