X0407 4 2023-05-18 0 0001484778 ThredUp Inc. TDUP 0001597755 Nakache Patricia C/O TRINITY VENTURES 325 SHARON PARK DR., #458 MENLO PARK CA 94025 1 0 1 0 0 Class A Common Stock 2023-05-18 4 C 0 7116 0.00 A 7116 I By Trinity Ventures X, L.P. Class A Common Stock 2023-05-18 4 C 0 71 0.00 A 71 I By Trinity X Entrepreneurs' Fund, L.P. Class A Common Stock 2023-05-18 4 C 0 39 0.00 A 39 I By Trinity X Side-By-Side Fund, L.P. Class A Common Stock 2023-05-18 4 S 0 7116 2.99 D 0 I By Trinity Ventures X, L.P. Class A Common Stock 2023-05-18 4 S 0 71 2.99 D 0 I By Trinity X Entrepreneurs' Fund, L.P. Class A Common Stock 2023-05-18 4 S 0 39 2.99 D 0 I By Trinity X Side-By-Side Fund, L.P. Class A Common Stock 2023-05-19 4 C 0 13557 0.00 A 13557 I By Trinity Ventures X, L.P. Class A Common Stock 2023-05-19 4 C 0 134 0.00 A 134 I By Trinity X Entrepreneurs' Fund, L.P. Class A Common Stock 2023-05-19 4 C 0 75 0.00 A 75 I By Trinity X Side-By-Side Fund, L.P. Class A Common Stock 2023-05-19 4 S 0 13557 3.00 D 0 I By Trinity Ventures X, L.P. Class A Common Stock 2023-05-19 4 S 0 134 3.00 D 0 I By Trinity X Entrepreneurs' Fund, L.P. Class A Common Stock 2023-05-19 4 S 0 75 3.00 D 0 I By Trinity X Side-By-Side Fund, L.P. Class A Common Stock 47 I By TVL Management Corp Class A Common Stock 76929 D Class B Common Stock 2023-05-18 4 C 0 7116 0.00 D Class A Common Stock 7116 8703753 I By Trinity Ventures X, L.P. Class B Common Stock 2023-05-18 4 C 0 71 0.00 D Class A Common Stock 71 86291 I By Trinity X Entrepreneurs' Fund, L.P. Class B Common Stock 2023-05-18 4 C 0 39 0.00 D Class A Common Stock 39 47981 I By Trinity X Side-By-Side Fund, L.P. Class B Common Stock 2023-05-19 4 C 0 13557 0.00 D Class A Common Stock 13557 8690196 I By Trinity Ventures X, L.P. Class B Common Stock 2023-05-19 4 C 0 134 0.00 D Class A Common Stock 134 86157 I By Trinity X Entrepreneurs' Fund, L.P. Class B Common Stock 2023-05-19 4 C 0 75 0.00 D Class A Common Stock 75 47906 I By Trinity Ventures X, L.P. Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. The Reporting Person is a Management Member of Trinity TVL X, LLC, the general partner of Trinity Ventures X, L.P., Trinity X Entrepreneurs' Fund, L.P. and Trinity X Side-By-Side Fund, L.P. (collectively, the "Trinity Funds"), and shares voting and dispositive power with the other Management Members over the shares held by each of the Trinity Funds. The Reporting Person disclaims beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.99 to $3.03 inclusive. The Reporting Persons undertake 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 Reporting Person is an executive officer and director of TVL Management Corp and shares voting and dispositive power over the shares held by TVL Management Corp. The Reporting Person disclaims beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein. 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. /s/ Patricia E. Nakache 2023-05-22