1stdibs.com, Inc.

We operate in a rapidly changing environment that involves a number of risks that could materially and adversely affect our business, financial condition, prospects, operating results or cash flows. For a detailed discussion of certain risks that affect our business, refer to the section entitled “Risk Factors” in our 2025 Annual Report on Form 10-K. There have been no material changes to the risk factors disclosed in our 2025 Form 10-K other than the addition of the Risk Factor below.

The risks described in our 2025 Form 10-K and below are not the only risks we face. We describe in Management’s Discussion and Analysis of Financial Condition and Results of Operations in Part I of this Quarterly Report on Form 10-Q certain known trends and uncertainties that affect our business. Additional risks and uncertainties that we are unaware of, or that we currently believe are not material, may also become important factors that adversely affect our business, operating results and financial condition.

Transitions in our executive management team may be disruptive to, impact investor confidence in, or cause uncertainty in, our business, results of operations and the price of our common stock, and we may not successfully manage the transition associated with our new Chief Executive Officer.

On November 2, 2026, David Rosenblatt, who has served as Chief Executive Officer and Chairman of the Board since 2011, provided the Board of Directors with notice of his decision to resign from the position of Chief Executive Officer, effective January 1, 2027. The Board of Directors subsequently appointed Mr. Rosenblatt as Executive Chairperson of the Board and appointed Bradford Shellhammer, currently serving as the Company’s Chief Product Officer and Chief Marketing Officer, as Chief Executive Officer and a member of the Board, in both cases effective January 1, 2027.

Leadership transitions of this nature can be disruptive to, impact investor confidence in, or cause uncertainty in, our business, results of operations and the price of our common stock. Leadership transitions are inherently difficult to manage and may result in the loss of institutional knowledge and changes to business strategy or objectives. Although we believe our leadership team brings valuable experience and skills, there can be no assurance our transition efforts will be successful or that our new leaders will achieve our strategic, operational, or financial objectives. If we are unsuccessful in our succession planning or transition efforts, or if we experience additional unanticipated departures among senior management or other key employees, investor confidence and our results of operations could be adversely affected.