#1Investor Presentation 2023 Q3 ARVONGW 1€DIBS 18% M AM-60 DODOMA 8000000 AMA 88-#22 Disclaimer This presentation contains "forward-looking statements" within the meaning of federal securities laws, including the Securities Act of 1933, as amended, and the Securities Exchange Act of 1934, as amended, that involve substantial risks and uncertainties. Any statements contained in this presentation that are not statements of historical facts may be deemed to be forward-looking statements. In some cases, you can identify forward-looking statements by the words "may," "might," "will," "can," "could," "would," "should," "expect," “intend,” “plan,” “objective,” “target," "anticipate," "believe," "estimate," "predict,” “project,” “potential,” “continue,” and “ongoing," or the negative of these terms, or other comparable terminology intended to identify statements about the future. These statements involve known and unknown risks, uncertainties, and other factors that may cause our actual results, performance, or achievements to be materially different from the information expressed or implied by these forward-looking statements. Forward-looking statements include, but are not limited to, statements about: our estimated market opportunity; our future financial performance and business model, including our expectations regarding our GMV, net revenue, cost of revenue, operating expenses, and our ability to achieve and maintain future profitability; our buyer and seller unit economics; our growth drivers and expectations as to future growth and our ability to manage growth; our key metrics; our cohort data; our strategies, plans, objectives, and goals; market demand for the products offered on our online marketplace and for online purchases of luxury design products generally; our ability to compete, scale our operations, attract and retain sellers and buyers, expand in our existing verticals and into adjacent verticals, increase our GMV and supply, expand our business within the U.S. and abroad, and launch additional business models; and economic and industry trends, projected growth, or trend analysis.#33 JEAN PROUVE JEAN PROUVE ARAKI Company Overview 1€DIBS#44 OUR MISSION We enrich lives with extraordinary design 9:41 EN MA all The Most Beautiful Things From the way they catch the eye to the stories they tell, these are our most iconic picces Search O I FURNITURE LIGHTING DECOR & GIFTS ART NFTS SHOP THE COLLECTION 1{DIBS Make Yourself at Home It takes hands to build a house, but only a heart can build a home. Our passions, quirks and memories infuse the spaces we inhabit, making them singular and deeply personal. Such is the magic of extraordinary design. JEWELRY & WATCHES FASHION Editors' Picks WORLD OF 1STDIBS SALE AUCTIONS#55 Asset-Light, Two-Sided Marketplace With Powerful Network Effects More highly-engaged buyers Unique, high-quality supply O Buyers 1{DIBS Superior UX underpinned by trusted brand Unrivaled access to global luxury buyer base Asset-light business model More supply: Vintage & Antique Furniture, New & Custom Furniture, Jewelry & Watches, Art, Fashion Sellers End-to-end technology platform, data, and analytics to support and grow business#62000 Company founded in Paris. 6 2011 Series A investment from Benchmark 44 Luxury E-Commerce Marketplace Built On a Legacy Brand 2012 Acquired Online Galleries and expanded international supply ESTABLISHING THE BRAND 2013 Launched e-Commerce 2014 Launched "Message Center," to facilitate. buyer/seller negotiations, and Paid Media Program 2015 Launched Trade Program for professional designers and architects 2015 Launched mobile app TRANSFORMING FROM LISTING TO E-COMMERCE MODEL 2016 Shifted to full e-Commerce marketplace model 2016 Launched. New & Custom Furniture 2018 Launched New & Contemporary Jewelry 2019 Over Im total listings 750 Ca 2020 $ibn in cumulative GMV 2021 IPO on NASDAQ 2021 First $ım art order placed on platform 2021 Launch of Online Auctions 2022 Launch of French & German Localization SCALING MARKETPLACE SUPPLY & DEMAND ACROSS VERTICALS 2023 Launch of Italian & Spanish Localization#77 $380m GMV 5.5m+) REGISTERED USERS $16bn+) SELLER STOCK VALUE 70% GROSS MARGIN 85+ (¹) COUNTRIES WHERE SELLERS ARE BASED 1stDibs By The Numbers $87m REVENUE 63,200 (2) ACTIVE BUYERS 9,100+(²) SELLERS ACCOUNTS $1,200+/$2,800+(2) MOV / AOV $0 OWNED INVENTORY 0000 Note: TTM through Q3 2023, unless otherwise noted. (1) As of December 31, 2022. (2) As of September 30, 2023. MOV denotes median order value. AOV denotes average (mean) order value. SEA#88 Vertical Expansion Supplements Vintage & Antique Furniture Core GMV at Inception OTHER VERTICALS COMPRISE A LARGER PERCENTAGE OF OUR GMV Note: Other Verticals includes Jewelry, New & Custom Furniture, Art, and Fashion. GMV in 2018 Vintage & Antique Other Verticals GMV in 2022#99 Technology Driven Platform Uniquely Positioned To Capture Share As The Luxury Goods Market Shifts Online LARGE MARKET OPPORTUNITY. Global luxury goods market is large, expanding, and currently has a relatively low online penetration due to physical nature of high AOV purchases UNIQUE, TRUSTED ONLINE LUXURY BRAND NAME. Multi-vertical marketplace for luxury goods trusted by both buyers and sellers DURABLE, TWO-SIDED NETWORK EFFECTS. Unique supply and vetted sellers attract buyers; high quality, loyal buyers attract sellers HIGHLY-SCALABLE TECH PLATFORM & BUSINESS MODEL. Technology designed to support growing business; no owned or managed inventory#1010 Financials 1€DIBS#112023 Q3 GMV: $89.0m $125,000 $100,000 $75,000 $50,000 $25,000 11 $0 Q3 2022 Q4 2022 Q1 2023 GMV (SK) Q2 2023 Q3 2023 Financial Performance 2023 Q3 Revenue: $20.7m $25,000 $20,000 $15,000 $10,000 $5,000 $0 Q3 2022 Q4 2022 Revenue (Sk) Q1 2023 Q2 2023 Gross Margin (%) Q3 2023 80% 60% 40% 20% 0% 2023 Q3 Adj. EBITDA: ($1.8m) $0 -$2,000 -$4,000 -$6,000 TW Q3 2022 Q4 2022 Adj. EBITDA (SK) Q1 2023 Q2 2023 - Adj. EBITDA Margin Q3 2023 0% -5% -10% -15% -20% -25%#1212 Appendix VREELAND MEMON SENTERET 1€DIBS THE 2#13Reconciliation of Quarterly Net Income to Adj. EBITDA Q1 2023 Q4 2022 (Amounts in thousands) Net loss Excluding: 13 Depreciation and amortization Stock-based compensation expense Other income, net Provision for income taxes Strategic alternative expenses Adjusted EBITDA (non-GAAP) Divided by: Net revenue Adjusted EBITDA Margin (non-GAAP) S S $ Q3 2023 (3,305) S 449 2,982 (1,928) (1,802) S 20,663 $ -8.7% Q2 2023 (8,320) S 427 3,252 (2,117) 2,179 (4,579) S 20,921 $ -21.9% 1€DIBS (8,133) S (6,861) S 939 3,106 (2,048) 882 (5,254) S 22,178 $ -23.7% 521 3,552 (1,804) 37 80 (4,475) S 22,957 $ -19.5% Q3 2022 (9,028) 708 3,154 (870) 580 (5,456) 22,729 -24.0%