•Quarterly revenue of $81.4 million, representing an increase of 14% year-over-year.

•Fourth quarter gross margin of 61.9% and an increase in gross profit of 12% year-over-year, which included a $1.9 million inventory write-off in Europe, an impact of 230 basis points to gross margin.

•Record full year revenue of $322.0 million, representing 12% growth year-over-year. Full year gross margin of 66.4% and gross profit growth of 11% year-over-year.

•Record Active Buyers of 1.8 million and Orders of 1.8 million in Q4 2023, representing year-over-year growth of 9% and 17%, respectively. Record annual orders of 6.9 million, representing growth of 6% year-over-year.

Oakland, CA — March 4, 2024 — ThredUp Inc. (Nasdaq: TDUP, LTSE: TDUP), one of the largest online resale platforms for apparel, shoes, and accessories, today announced its financial results for the fourth quarter and full year ended December 31, 2023.

“We closed out 2023 with another quarter of strong financial performance, demonstrating healthy top-line growth and bottom-line leverage,” said ThredUp CEO and co-founder James Reinhart. “Looking ahead, we are confident that by focusing on strategic growth drivers in the U.S. and applying our proven resale playbook in Europe, we can deliver adjusted EBITDA breakeven on an annual basis in 2024.”

•Revenue: Total revenue of $81.4 million, an increase of 14% year-over-year.

•Gross Profit and Gross Margin: Gross profit totaled $50.4 million, representing an increase of 12% year-over-year. Gross margin was 61.9% as compared to 63.1% in the fourth quarter last year. Gross profit included a $1.9 million inventory write-off in Europe, an impact of 230 basis points to gross margin.

•Net Loss: Net loss was $14.6 million, or a negative 18.0% of revenue, for the fourth quarter 2023, compared to a net loss of $19.5 million, or a negative 27.3% of revenue, for the fourth quarter 2022.

•Adjusted EBITDA Loss and Adjusted EBITDA Loss Margin1: Adjusted EBITDA loss was $2.1 million, or a negative 2.6% of revenue, for the fourth quarter 2023. This is compared to an Adjusted EBITDA loss of $5.8 million, or a negative 8.2% of revenue, for the fourth quarter 2022.

1 Adjusted EBITDA loss and Adjusted EBITDA loss margin are non-GAAP measures. See “Reconciliation of GAAP to Non-GAAP Financial Measures” for a detailed reconciliation of Adjusted EBITDA loss to the most directly comparable GAAP measure and “Non-GAAP Financial Measures” for a discussion of why we believe these non-GAAP measures are useful.

•Active Buyers and Orders: Active Buyers of 1.797 million and Orders of 1.807 million, representing increases of 9% and 17%, respectively, over the fourth quarter 2022.

•Revenue: Total revenue of $322.0 million, an increase of 12% year-over-year.

•Gross Profit and Gross Margin: Gross profit totaled $213.8 million, representing an increase of 11% year-over-year. Gross margin was 66.4% compared to 66.7% last year.

•Net Loss: Net loss was $71.2 million, or a negative 22.1% of revenue, for the full year 2023, compared to a net loss of $92.3 million, or a negative 32.0% of revenue, for the full year 2022.

•Adjusted EBITDA Loss and Adjusted EBITDA Loss Margin1: Adjusted EBITDA loss was $17.4 million, or a negative 5.4% of revenue, for the full year 2023, compared to the Adjusted EBITDA loss of $43.4 million, or a negative 15.0% of revenue, for the full year 2022.

•Orders: Record orders of 6.9 million for the full year 2023, growing 6% over 6.5 million for the full year 2022.

•AI Innovation: ThredUp recently debuted an AI-powered search experience that makes it easy and intuitive to find secondhand items in its marketplace. They’ve also begun to leverage generative AI that will soon give customers the ability to create outfits they love and are strategically implementing AI across operations in its distribution center network to enhance inventory management and processing.

•Customer Experience Improvements: After implementing Delivery Promise and Thrift Promise, which aim to deliver purchase-to-doorstep shipping in three days or less and ensure the highest levels of customer satisfaction with every order, ThredUp’s Q4 return rate decreased by 700 basis points compared to the same quarter of 2022.

•Industry recognition: ThredUp's Resale-as-a-Service (RaaS) was named a winner in Good Housekeeping’s 2024 Sustainable Innovation Awards, which recognizes products and services that have embraced a “people, purpose, and planet” approach to sustainability.

For the first quarter 2024, ThredUp expects:

•Revenue in the range of $79.0 million to $81.0 million.

•Gross margin in the range of 68.5% to 70.5%, representing gross profit dollar growth of 9% year over year at the midpoint of revenue and gross margin guidance.

•Adjusted EBITDA loss margin in the range of 3.0% to 1.0%.

For the full fiscal year 2024, ThredUp expects:

•Revenue in the range of $340.0 million to $350.0 million.

•Gross margin in the range of 69.5% to 71.5%, representing gross profit dollar growth of 14% year over year at the midpoint of revenue and gross margin guidance.

•Adjusted EBITDA margin in the range of 0.5% to 1.5%.

ThredUp is not providing a quantitative reconciliation of forward-looking guidance of the non-GAAP measure Adjusted EBITDA loss to net loss because certain items are out of ThredUp’s control or cannot be reasonably predicted. Historically, these items have included, but are not limited to, depreciation and amortization, stock-based compensation expense and provision for income taxes. Accordingly, a reconciliation for Adjusted EBITDA loss in order to calculate forward-looking Adjusted EBITDA loss margin is not available without unreasonable effort. However, for the first quarter of 2024 and full year 2024, depreciation and amortization is expected to be $5.0 million and $19.8 million, respectively. In addition, for the first quarter of 2024 and full year 2024, stock-based compensation expense is expected to be $7.5 million and $33.0 million, respectively. These items are uncertain, depend on various factors, and could result in the projected net loss being materially less than indicated by the currently estimated Adjusted EBITDA loss margin.

•The live and archived webcast and all related earnings materials will be available at ThredUp’s investor relations website: ir.thredup.com/news-events/events-and-presentations.

ir@thredup.com

media@thredup.com

ThredUp is transforming resale with technology and a mission to inspire the world to think secondhand first. By making it easy to buy and sell secondhand, ThredUp has become one of the world's largest online resale platforms for apparel, shoes and accessories. Sellers love ThredUp because we make it easy to clean out their closets and unlock value for themselves or for the charity of their choice while doing good for the planet. Buyers love shopping value, premium and luxury brands all in one place, at up to 90% off estimated retail price. Our proprietary operating platform is the foundation for our managed marketplace and consists of distributed processing infrastructure, proprietary software and systems, and data science expertise. With ThredUp’s Resale-as-a-Service, some of the world's leading brands and retailers are leveraging our platform to deliver customizable, scalable resale experiences to their customers. ThredUp has processed over 172 million unique secondhand items from 55,000 brands across 100 categories. By extending the life cycle of clothing, ThredUp is changing the way consumers shop and ushering in a more sustainable future for the fashion industry.

This press release contains forward-looking statements within the meaning of the federal securities laws, 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, you can identify forward-looking statements because they contain words such as “may,” “will,” “shall,” “should,” “expects,” “plans,” “anticipates,” “could,” “intends,” “target,” “projects,” “contemplates,” “believes,” “estimates,” “predicts,” “potential” or “continue” or the negative of these words or other similar terms or expressions that concern our expectations, strategy, plans or intentions. Forward-looking statements in this release include, but are not limited to, guidance on financial results for the first quarter and full year of 2024; statements about future operating results, capital expenditures and other developments in our business in the U.S. and Europe and our long term growth; the momentum of our business; our investments in technology and infrastructure, including our AI-powered search experience; our ability to successfully integrate and realize the benefits of our past or future strategic acquisitions, investments or restructuring activities; and our ability to attract new Active Buyers.

Forward-looking statements are neither historical facts nor assurances of future performance. Forward-looking statements involve substantial risks and uncertainties that may cause actual results to differ materially from those that we expect. These risks and uncertainties include, but are not limited to: our ability to attract new users and convert users into buyers and active buyers; our ability to achieve 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 ability to continue to generate revenue from new RaaS offerings as sources of revenue; risks from an intensely competitive market; our ability to effectively deploy new and evolving technologies, such as artificial intelligence and machine learning, in our offerings; risks arising from economic and industry trends, including the effects of foreign currency exchange rate fluctuations, inflationary pressures, increased interest rates, changing consumer habits, climate change and general global economic uncertainty; our ability to comply with applicable laws and regulations; and our ability to successfully integrate and realize the benefits of our past or future strategic acquisitions or investments. More information on these risks and other potential factors that could affect the Company’s business, reputation, results of operations, financial condition, and stock price is included in the Company’s filings with the Securities and Exchange Commission (“SEC”), including in the “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” sections of the Company’s most recently filed periodic reports on Form 10-K and subsequent filings. The forward-looking statements in this release are based on information available to us as of the date hereof, and we disclaim any obligation to update any forward-looking statements, except as required by law. These forward-looking statements should not be relied upon as representing ThredUp’s views as of any date subsequent to the date of this press release.

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 communicate with its investors, customers, and the public about the company, its offerings, and other issues. It is possible that the information ThredUp posts on social media could be deemed to be material information. As such, ThredUp encourages investors, the media, and others to follow the channels listed above, including the social media channels listed on ThredUp’s investor relations website, and to review the information disclosed through such channels.

This press release and the accompanying tables contain non-GAAP financial measures, including: Adjusted EBITDA loss and Adjusted EBITDA loss margin. In addition to our results determined in accordance with GAAP, we believe these non-GAAP measures, are useful in evaluating our operating performance. We use these measures to evaluate and assess our operating performance and the operating leverage in our business, and for internal planning and forecasting purposes. We believe that these non-GAAP measures, when taken collectively with our GAAP results, may be helpful to investors because they provide consistency and comparability with past financial performance and assist in comparisons with other companies, some of which use similar non-GAAP financial information to supplement their GAAP results. Our non-GAAP measures are presented for supplemental informational purposes only, should not be considered a substitute for financial information presented in accordance with GAAP and may be different from similarly-titled non-GAAP measures used by other companies. We encourage investors to review our results determined in accordance with GAAP and the accompanying reconciliations for more information.

A reconciliation is provided above for Adjusted EBITDA loss to net loss, the most directly comparable financial measure stated in accordance with GAAP. We calculate Adjusted EBITDA loss as net loss adjusted to exclude, where applicable in a given period, stock-based compensation expense, depreciation and amortization, interest expense, severance and other, provision (benefit) for income taxes, impairment of non-marketable equity investment and acquisition and offering-related expenses. Non-GAAP Adjusted EBITDA loss margin represents Non-GAAP Adjusted EBITDA loss divided by total revenue for the same period.

ir@thredup.com

media@thredup.com

ThredUp is transforming resale with technology and a mission to inspire the world to think secondhand first. By making it easy to buy and sell secondhand, ThredUp has become one of the world's largest online resale platforms for apparel, shoes and accessories. Sellers love ThredUp because we make it easy to clean out their closets and unlock value for themselves or for the charity of their choice while doing good for the planet. Buyers love shopping value, premium and luxury brands all in one place, at up to 90% off estimated retail price. Our proprietary operating platform is the foundation for our managed marketplace and consists of distributed processing infrastructure, proprietary software and systems and data science expertise. With ThredUp’s Resale-as-a-Service, some of the world's leading brands and retailers are leveraging our platform to deliver customizable, scalable resale experiences to their customers. ThredUp has processed over 172 million unique secondhand items from 55,000 brands across 100 categories. By extending the life cycle of clothing, ThredUp is changing the way consumers shop and ushering in a more sustainable future for the fashion industry.

This financial supplement contains forward-looking statements within the meaning of the federal securities laws, 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, you can identify forward-looking statements because they contain words such as “may,” “will,” “shall,” “should,” “expects,” “plans,” “anticipates,” “could,” “intends,” “target,” “projects,” “contemplates,” “believes,” “estimates,” “predicts,” “potential” or “continue” or the negative of these words or other similar terms or expressions that concern our expectations, strategy, plans or intentions. Forward-looking statements in this financial supplement include, but are not limited to, guidance on financial results for the first quarter and full year of 2024; statements about future operating results and our long term growth; the momentum of our business; the growth rates in the markets in which we compete; the impact of inflationary pressures, increased interest rates, climate change and general global economic uncertainty on consumer behavior and our business; our investments in technology and infrastructure; our ability to successfully integrate and realize the benefits of our past or future strategic acquisitions, investments or restructuring activities; the success and expansion of our RaaS® model and the timing and plans for future RaaS® clients; and our ability to attract new Active Buyers.

More information on these risks and other potential factors that could affect the Company’s business, reputation, results of operations, financial condition, and stock price is included in the Company’s filings with the Securities and Exchange Commission (“SEC”), including in the “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” sections of the Company’s most recently filed periodic reports on Form 10-K and Form 10-Q and subsequent filings. The forward-looking statements in this financial supplement are based on information available to us as of the date hereof, and we disclaim any obligation to update any forward-looking statements, except as required by law. These forward-looking statements should not be relied upon as representing ThredUp’s views as of any date subsequent to the date of this financial supplement.

This financial supplement and the accompanying tables contain non-GAAP financial measures: Adjusted EBITDA loss, Adjusted EBITDA loss margin, and Non-GAAP operating expenses. In addition to our results determined in accordance with GAAP, we believe that Adjusted EBITDA loss, Adjusted EBITDA loss margin, and non-GAAP operating expenses, our non-GAAP financial measures, are useful in evaluating our operating performance. We use Adjusted EBITDA loss, Adjusted EBITDA loss margin, and Non-GAAP operating expenses to evaluate and assess our operating performance and the operating leverage in our business, and for internal planning and forecasting purposes. We believe that Adjusted EBITDA loss, Adjusted EBITDA loss margin, and Non-GAAP operating expenses, when taken collectively with our GAAP results, may be helpful to investors because they provide consistency and comparability with past financial performance and assist in comparisons with other companies, some of which use similar non-GAAP financial information to supplement their GAAP results. Adjusted EBITDA loss, Adjusted EBITDA loss margin, and Non-GAAP operating expenses are presented for supplemental informational purposes only, should not be considered a substitute for financial information presented in accordance with GAAP and may be different from similarly-titled non-GAAP financial measures used by other companies.

A reconciliation is provided above for Adjusted EBITDA loss to net loss and Non-GAAP operating expenses to total operating expenses, the most directly comparable financial measures stated in accordance with GAAP. We calculate Adjusted EBITDA loss as net loss adjusted to exclude, where applicable in a given period, stock-based compensation expense, depreciation and amortization, interest expense, severance and other, provision (benefit) for income taxes, impairment of non-marketable equity investment and acquisition and offering-related expenses. Non-GAAP operating expenses are operating expenses adjusted to exclude stock-based compensation expense.

Investors are encouraged to review our results determined in accordance with GAAP and the reconciliation of Adjusted EBITDA loss to net loss. ThredUp is not providing a quantitative reconciliation of forward-looking guidance of Adjusted EBITDA loss to net loss because certain items are out of ThredUp’s control or cannot be reasonably predicted. Historically, these items have included, but are not limited to, depreciation and amortization, stock-based compensation expense and provision for income taxes. Accordingly, a reconciliation for Adjusted EBITDA loss in order to calculate forward-looking Adjusted EBITDA loss margin is not available without unreasonable effort. However, for the first quarter of 2024 and full year 2024, depreciation and amortization is expected to be $5.0 million and $19.8 million, respectively. In addition, for the first quarter of 2024 and full year 2024, stock-based compensation expense is expected to be $7.5 million and $33.0 million, respectively. These items are uncertain, depend on various factors, and could result in the projected net loss being materially less than indicated by the currently estimated Adjusted EBITDA margin.