X0508 4 2023-07-27 0 0001484778 ThredUp Inc. TDUP 0001461710 Trinity TVL X, LLC 325 SHARON PARK DR., #458 MENLO PARK CA 94025 0 0 1 0 0001456065 TRINITY VENTURES X LP 325 SHARON PARK DR., #458 MENLO PARK CA 94025 0 0 1 0 0001461716 Trinity X Entrepreneurs' Fund, L.P. 325 SHARON PARK DR., #458 MENLO PARK CA 94025 0 0 1 0 0001459208 Trinity X Side-By-Side Fund, L.P. 325 SHARON PARK DR., #458 MENLO PARK CA 94025 0 0 1 0 0001228023 CHOPRA AJAY C/O TRINITY VENTURES 325 SHARON PARK DR., #458 MENLO PARK CA 94025 0 0 1 0 0001290449 Fenton Noel J C/O TRINITY VENTURES 325 SHARON PARK DR., #458 MENLO PARK CA 94025 0 0 1 0 0 Class A Common Stock 2023-07-27 4 C 0 1588 0.00 A 1588 I By Trinity Ventures X, L.P. Class A Common Stock 2023-07-27 4 C 0 16 0.00 A 16 I By Trinity X Entrepreneurs' Fund, L.P. Class A Common Stock 2023-07-27 4 C 0 8 0.00 A 8 I By Trinity X Side-By-Side Fund, L.P. Class A Common Stock 2023-07-27 4 S 0 1588 3.47 D 0 I By Trinity Ventures X, L.P. Class A Common Stock 2023-07-27 4 S 0 16 3.47 D 0 I By Trinity X Entrepreneurs' Fund, L.P. Class A Common Stock 2023-07-27 4 S 0 8 3.47 D 0 I By Trinity X Side-By-Side Fund, L.P. Class A Common Stock 2023-07-28 4 C 0 47652 0.00 A 47652 I By Trinity Ventures X, L.P. Class A Common Stock 2023-07-28 4 C 0 471 0.00 A 471 I By Trinity X Entrepreneurs' Fund, L.P. Class A Common Stock 2023-07-28 4 C 0 264 0.00 A 264 I By Trinity X Side-By-Side Fund, L.P. Class A Common Stock 2023-07-28 4 S 0 47652 3.48 D 0 I By Trinity Ventures X, L.P. Class A Common Stock 2023-07-28 4 S 0 471 3.48 D 0 I By Trinity X Entrepreneurs' Fund, L.P. Class A Common Stock 2023-07-28 4 S 0 264 3.48 D 0 I By Trinity X Side-By-Side Fund, L.P. Class A Common Stock 47 D Class A Common Stock 957 D Class A Common Stock 1031 D Class B Common Stock 2023-07-27 4 C 0 1588 0.00 D Class A Common Stock 1588 8540888 I By Trinity Ventures X, L.P. Class B Common Stock 2023-07-27 4 C 0 16 0.00 D Class A Common Stock 16 84559 I By Trinity X Entrepreneurs' Fund, L.P. Class B Common Stock 2023-07-27 4 C 0 8 0.00 D Class A Common Stock 8 47203 I By Trinity X Side-By-Side Fund, L.P. Class B Common Stock 2023-07-28 4 C 0 47652 0.00 D Class A Common Stock 47652 8493236 I By Trinity Ventures X, L.P. Class B Common Stock 2023-07-28 4 C 0 471 0.00 D Class A Common Stock 471 84088 I By Trinity X Entrepreneurs' Fund, L.P. Class B Common Stock 2023-07-28 4 C 0 264 0.00 D Class A Common Stock 264 46939 I By Trinity X Side-By-Side Fund, L.P. This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on June 9, 2023. Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. Trinity TVL X, LLC is 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 the Management Members of Trinity TVL X, LLC share voting and dispositive power over the shares held by each of the Trinity Funds. The Management Members of Trinity TVL X, LLC are Ajay Chopra, Noel Fenton and Patricia Nakache. Each of Trinity TVL X, LLC, Mr. Chopra and Mr. Fenton disclaims beneficial ownership of the shares reported herein except to the extent of its or his respective pecuniary interest therein. Ms. Nakache is a director of the Issuer and files separate Section 16 reports. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.46 to $3.48 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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.46 to $3.52 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. Shares are directly held by TVL Management Corp ("TVL Corp"). Each of Ajay Chopra, Noel Fenton and Patricia Nakache is an executive officer and director of TVL Corp and shares voting and dispositive power over the shares held by TVL Corp. Each of Mr. Chopra and Mr. Fenton disclaims beneficial ownership of the shares reported herein except to the extent of his respective pecuniary interest therein. Ms. Nakache is a director of the Issuer and files separate Section 16 reports. Shares are directly held by Ajay Chopra. Shares are directly held by Noel J. Fenton. 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. Trinity TVL X, LLC By /s/ Lyle McCulloch, SVP Finance 2023-07-31 Trinity Ventures X, L.P., By: Trinity TVL X, LLC, its General Partner, By /s/ Lyle McCulloch, SVP Finance 2023-07-31 Trinity X Entrepreneurs' Fund, L.P., By: Trinity TVL X, LLC, its General Partner, By /s/ Lyle McCulloch, SVP Finance 2023-07-31 Trinity X Side-By-Side Fund, L.P., By: Trinity TVL X, LLC, its General Partner, By /s/ Lyle McCulloch, SVP Finance 2023-07-31 /s/ Ajay Chopra 2023-07-31 /s/ Noel J. Fenton 2023-07-31