X0508 4 2025-11-07 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 Common Stock 2025-11-07 4 C 0 200000 0 A 200000 I By Trust Common Stock 2025-11-07 4 S 0 200000 7.9492 D 0 I By Trust Class A Common Stock 2025-11-07 4 S 0 379826 7.932 D 573851 D Class B Common Stock 2025-11-07 4 C 0 200000 0 D Class A Common Stock 200000 2383795 I By Trust Class B Common Stock Class A Common Stock 444629 444629 I By Trust Class B Common Stock Class A Common Stock 446117 446117 D Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation. Shares held of record by James Reinhart and Michele Reinhart as Trustees of the Costanoa Family Trust dated July 22 2015 as amended (the "2015 Costanoa Trust"). The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $7.88 to $8.095 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, 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 range set forth in this footnote. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $7.78 to $8.10 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, 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 range set forth in this footnote. Shares held of record by James Reinhart and Michele Reinhart as Trustees of The Costanoa 2017 Irrevocable GST Trust (the "2017 Costanoa GST Trust"). /s/ Alon Rotem, Attorney-in-Fact 2025-11-07