X0609 4 2026-10-01 0 0001616707 Wayfair Inc. W 0001994593 Blotner Jon false C/O WAYFAIR INC., 4 COPLEY PLACE BOSTON MA 02116 0 1 0 0 Pres., Commercial & Operations 1 Class A Common Stock 2026-10-01 4 M 0 327 0 A 110703 D Class A Common Stock 2026-10-01 4 M 0 182 0 A 110885 D Class A Common Stock 2026-10-01 4 M 0 22942 0 A 133827 D Class A Common Stock 2026-10-01 4 F 0 11340 101.37 D 122487 D Class A Common Stock 2026-10-02 4 S 0 6056 104.13 D 116431 D Class A Common Stock 100 I See Footnote Restricted Stock Units ("RSUs") 2026-10-01 4 M 0 327 0 D Class A Common Stock 327 0 D Restricted Stock Units ("RSUs") 2026-10-01 4 M 0 182 0 D Class A Common Stock 182 365 D Restricted Stock Unit ("RSU") 2026-10-01 4 M 0 22942 0 D Class A Common Stock 22942 45884 D 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. 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. Represents shares directly owned by the reporting person's spouse, of which the reporting person is deemed a beneficial owner. Each RSU represents a contingent right to receive one share of Class A Common Stock when vested. 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. 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. 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. /s/ Enrique Colbert, Attorney-In-Fact for Jon Blotner 2026-10-05