X0609 4 2026-09-01 0 0001484778 ThredUp Inc. TDUP 0001850197 Homer Christopher false C/O THREDUP INC. 969 BROADWAY, SUITE 200 OAKLAND CA 94607 0 1 0 0 Chief Operating Officer 0 Class A Common Stock 2026-09-01 4 M 0 54167 0 A 1389990 D Class A Common Stock 2026-09-02 4 S 0 26632 2.5812 D 1363358 D Class A Common Stock 2026-09-01 4 M 0 39583 0 A 1402941 D Class A Common Stock 2026-09-02 4 S 0 19463 2.5812 D 1383478 D Class A Common Stock 2026-09-01 4 M 0 28745 0 A 1412223 D Class A Common Stock 2026-09-02 4 S 0 14135 2.5812 D 1398088 D Restricted Stock Units 2026-09-01 4 M 0 54167 0 D Class A Common Stock 54167 579118 D Restricted Stock Units 2026-09-01 4 M 0 39583 0 D Class A Common Stock 39583 539535 D Restricted Stock Units 2026-09-01 4 M 0 28745 0 D Class A Common Stock 28745 510790 D Represents the number of shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person. Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock. On February 26, 2024, the Reporting Person was granted 650,000 RSUs, vesting in twelve equal quarterly installments on June 1, September 1, December 1 and March 1 until fully vested, subject to the Reporting Person's continued service to the Issuer on each such date. On January 9, 2025, the Reporting Person was granted 475,000 RSUs, vesting in twelve equal quarterly installments on June 1, September 1, December 1 and March 1 until fully vested, subject to the Reporting Person's continued service to the Issuer on each such date. On January 28, 2026, the Reporting Person was granted 344,941 RSUs, vesting in twelve equal quarterly installments on June 1, September 1, December 1 and March 1 until fully vested, subject to the Reporting Person's continued service to the Issuer on each such date. /s/ Alon Rotem, Attorney-in-Fact 2026-09-03