X0508 4 2025-12-01 0 0001484778 ThredUp Inc. TDUP 0001849447 Reinhart James G. C/O THREDUP INC. 969 BROADWAY, SUITE 200 OAKLAND CA 94607 1 1 0 0 Chief Executive Officer 0 Class A Common Stock 2025-12-01 4 M 0 107514 0 A 681365 D Class A Common Stock 2025-12-02 4 S 0 55364 7.4216 D 626001 D Class A Common Stock 2025-12-01 4 M 0 166667 0 A 792668 D Class A Common Stock 2025-12-02 4 S 0 85824 7.4216 D 706844 D Class A Common Stock 2025-12-01 4 M 0 111666 0 A 818510 D Class A Common Stock 2025-12-02 4 S 0 57502 7.4216 D 761008 D Restricted Stock Units 2025-12-01 4 M 0 107514 0 D Class A Common Stock 107514 1838349 D Restricted Stock Units 2025-12-01 4 M 0 166667 0 D Class A Common Stock 166667 1671682 D Restricted Stock Units 2025-12-01 4 M 0 111666 0 D Class A Common Stock 111666 1560016 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 15, 2023, the Reporting Person was granted 1,290,168 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 February 26, 2024, the Reporting Person was granted 2,000,000 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 1,340,000 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. /s/ Alon Rotem, Attorney-in-Fact 2025-12-02