United States securities and exchange commission logo April 14, 2021 David S. Rosenblatt Chief Executive Officer 1stdibs.com, Inc. 51 Astor Place, 3rd Floor New York, New York 10003 Re: 1stdibs.com, Inc. Amendment No. 1 to Draft Registration Statement on Form S-1 Submitted March 29, 2021 CIK No. 0001600641 Dear Mr. Rosenblatt: We have reviewed your amended draft registration statement and have the following comments. In some of our comments, we may ask you to provide us with information so we may better understand your disclosure. Please respond to this letter by providing the requested information and either submitting an amended draft registration statement or publicly filing your registration statement on EDGAR. If you do not believe our comments apply to your facts and circumstances or do not believe an amendment is appropriate, please tell us why in your response. After reviewing the information you provide in response to these comments and your amended draft registration statement or filed registration statement, we may have additional comments. Amendment No. 1 to Draft Registration Statement on Form S-1 submitted March 29, 2021 Prospectus Summary, page 1 1. We note your response to comment 1, and your amended disclosure that you are "one of" the world's leading marketplaces for luxury items. Please disclose the measure by which you are one of the leading marketplaces. For example, disclose whether you lead by market share, sales, revenues, etc. Management's Discussion and Analysis of Financial Condition and Results of Operations Our Business Model, page 66 2. We note your response to comment 13, including that your Trade 1st program is a buyer- only program and offers certain commercial benefits to Trade 1st members who are a David S. Rosenblatt 1stdibs.com, Inc. April 14, 2021 Page 2 subset of your buyers. Please amend the disclosure in an appropriate place in your filing to include the discussion in your response. Key Factors Affecting Our Performance Sourcing and Quality of Our Highly-Curated Luxury Supply, page 69 3. We note your response to our prior comment 18, and reissue the comment in part. Please tell us why you believe that the average retention rate provides investors with information necessary to understand the retention rate and its overall impact on your business, and how presenting the average for each year in a five-year period is appropriate given that 2015 appears to be the only cohort which is included in each of the years. In the alternative, please break out the data separately for each cohort. Buyer Acquisition Costs and Lifetime Value, page 71 4. We note your response to comment 20, and your amended disclosure on page 72. However, your disclosure provides increasing value for the Registrant s LTV/BAC ratio for each year in solely the 2017 cohort's life, and provides no data for other cohorts with respect to the LTV/BAC ratio. To provide investors with context regarding how your LTV to BAC ratio is "increasing," please amend your disclosure to provide LTV to BAC data for other cohorts before and after 2017. Please also tell us how you allocate retention marketing costs in a single year, including performance-based marketing, among the various cohorts. Liquidity and Capital Resources Cash Flows Cash Flows from Operating Activities, page 84 5. Your discussion of cash flows from operating activities appears to focus on how this amount was derived in each period. The discussion should be a comparative analysis of material changes in this amount between periods. Refer to Item 303(a) and (b) of Regulation S-K. In your analysis, please note that references to results of operations, which is prepared on the accrual basis of accounting, and working capital movements may not provide a sufficient basis for an investor to fully understand comparative changes in terms of cash. Refer to Section IV.B.1 of Interpretation: Commission Guidance Regarding Management's Discussion and Analysis of Financial Condition and Results of Operations for guidance. Your discussion should address the drivers underlying each FirstName LastNameDavid S. Rosenblatt factor cited. For example, discuss the specific items that created favorable and Comapany Name1stdibs.com, unfavorable movementsInc. in working capital in terms of cash and the reasons underlying such April 14, movements. 2021 Page 2 FirstName LastName David S. Rosenblatt FirstName LastNameDavid S. Rosenblatt 1stdibs.com, Inc. Comapany April Name1stdibs.com, Inc. 14, 2021 April 314, 2021 Page 3 Page FirstName LastName The 1stDibs Marketplace Trust, page 94 6. We note your response to comment 18, including that the chart on page 69 represents retention rate for seller cohorts, and the statement on page 94 relates to on-platform GMV from buyers. To provide context for investors related to your buyer retention, please amend your disclosure in this section to provide your buyer GMV retention rate for 2019. As a related matter, please clarify how you attribute GMV to specific buyers or buyer cohorts, including how you define buyer cohorts, considering that you define GMV as "the total dollar value from items sold by our sellers through 1stDibs in a given month, minus cancellations within that month, and excluding shipping and sales taxes" (emphasis added). You may contact Patrick Kuhn at (202) 551-3308 or Doug Jones at (202) 551-3309 if you have questions regarding comments on the financial statements and related matters. Please contact Katherine Bagley at (202) 551-2545 or Erin Jaskot at (202) 551-3442 with any other questions. Sincerely, Division of Corporation Finance Office of Trade & Services cc: Davina K. Kaile