UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 or ThredUp Inc. (Exact name of registrant as specified in its charter) Delaware 26-4009181 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.) 969 Broadway, Suite 200 Oakland, California 94607 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 ...