(Mark One)☒QUARTERLY REPORT PURSUANT TO SECTION13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the quarterly period endedMarch31, 2025 ☐TRANSITION REPORT PURSUANT TO SECTION13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ThredUp Inc. Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule405 ofRegulationS-T (§232.405 of this chapter) during the preceding 12months (or for such shorter period that the registrant was required to submit suchfiles).Yes☒No☐ Accelerated filerSmaller reporting company Table of Contents SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS This Quarterly Report on Form10-Q contains forward-looking statements within the meaning of the Private SecuritiesLitigation Reform Act of 1995, Section27A of the Securities Act of 1933, as amended, and Section21E of the SecuritiesExchange Act of 1934, as amended, which are statements that involve substantial risks and uncertainties. Forward-looking statements generally relate to future events or our future financial or operating performance. In some cases, youcan identify forward-looking statements because they contain words such as “may,” “will,” “shall,” “should,” “expects,” •our future financial performance, including our revenue, cost of revenue and operating expenses and our ability toachieve and maintain future profitability; •the sufficiency of our cash, cash equivalents and capital resources to meet our liquidity needs;•our ability to effectively manage or sustain our growth and to effectively expand our operations;•our strategies, plans, objectives and goals, including our expectations regarding future infrastructure investmentsas well as restructuring activities; •our ability to attract and retain buyers and sellers and the continued impact of network effects as we scale ourplatform; •our ability to continue to generate revenue from Resale-as-a-Service (“RaaS”) offerings as sources of revenue; •trends in our key financial and operating metrics; •our estimated market opportunity; •economic and industry trends, projected growth or trend analysis, including inflationary pressures, increasedinterest rates, cybersecurity risks, changing consumer habits, climate change and extreme weather events and •our ability to comply with applicable laws and regulations; •our ability to incorporate artificial intelligence and machine learning and other emergent technologies into our our discontinuation of European operations in connection with the divestiture of our Remix subsidiary. You should not rely upon forward-looking statements as predictions of future events. Forward-looking statements areneither historical facts nor assurances of future performance. Forward-looking statements involve substantial risks anduncertainties that may cause actual results to differ materially from those that we expect. These risks and uncertaintiesinclude, but are not limited to: our ability to attract new users and convert users into buyers and active buyers; thesufficiency of our cash, cash equivalents and capital resources to meet our liquidity needs; our ability to effectivelymanage or sustain our growth and to effectively expand our operations; our ability to continue to generate revenue fromnew RaaS offerings as sources of revenue; risks from an intensely competitive market; our ability to effectively deploy newand evolving technologies, such as artificial intelligence and machine learning, in our offerings; risks arising fromeconomic and industry trends, including the effects of inflationary pressures, increased interest rates, changing consumerhabits, climate change and general global political and economic uncertainty; our ability to comply with applicable laws Table of Contents The forward-looking statements made in this Quarterly Report on Form10-Q relate only to events as of the date onwhich the statements are made. We undertake no obligation to update any forward-looking statements made in this Unless otherwise indicated or unless the context requires otherwise, all references in this document to “ThredUp”, “theCompany”, “we”, “us”, “our”, or similar references are to ThredUp Inc. and its consolidated subsidiaries. ThredUp is one of the world’s largest online resale platforms for apparel, shoes and accessories, based primarily onitems processed, items sold and the capacity of our distribution centers. The “estimated retail price” of an item is based on the estimated original retail price of a comparable item of the samequality, construction and material offered elsewhere in new condition. Our estimated original retail prices are set by our Channels for Disclosure of Information ThredUp intends to announce material information to the public through the ThredUp Investor Relations website(ir.thredup.com), SEC filings, press releases, public conference calls, and public webcasts. ThredUp uses these channels,as well as social media, to communica