Commerce.com, Inc.

and Notice of Annual Meeting

Commerce’s 2026 Annual Meeting will be held at 8:00 a.m. Central Time on Thursday, May 14, 2026. This Annual Meeting of Shareholders will be held in virtual format only. You will not be able to attend the annual meeting in person.

Letter toStockholdersDear Stockholder:You are cordially invited to attend this year’s annual meeting of stockholders of Commerce.com, Inc. on May 14, 2026, at 8:00 a.m. Central Time. The annual meeting will be a completely “virtual” meeting. You will be able to attend the annual meeting, as well as vote and submit your questions during the live webcast of the meeting, by visiting www.virtualshareholdermeeting.com/CMRC2026 and entering the company number and control number included on your proxy card or in the instructions that accompany your proxy materials. Details regarding admission to the annual meeting and the business to be conducted at the annual meeting are described in the accompanying Notice of Annual Meeting of Stockholders and Proxy Statement. Whether or not you plan to attend the annual meeting, your vote is important and we encourage you to vote promptly. You may vote by either marking, signing and returning the enclosed proxy card or using telephone or internet voting. For specific instructions on voting, please refer to the instructions on your enclosed proxy card. If you attend the annual meeting you will have the right to revoke the proxy and vote your shares virtually at the meeting. If you hold your shares through an account with a brokerage firm, bank or other nominee, please follow the instructions you receive from your brokerage firm, bank or other nominee to vote your shares. Sincerely yours, TRAVIS HESS Director and Chief Executive OfficerApril 1, 2026

In accordance with rules and regulations adopted by the Securities and Exchange Commission, we have elected to furnish our proxy materials to stockholders by providing access to the materials on the Internet. Accordingly, a Notice of Internet Availability of Proxy Materials (the Internet Availability Notice) has been mailed to the majority of our stockholders, while other stockholders have instead received paper copies of the documents accessible on the Internet. It is important that your shares be represented and voted whether or not you plan to attend the annual meeting. If you are the registered holder of your shares and are viewing the proxy statement on the Internet, you may grant your proxy electronically via the Internet by following the instructions on the Internet Availability Notice previously mailed to you and the instructions listed on the Internet site. If you are receiving a paper copy of the proxy statement, you may vote by completing and mailing the proxy card enclosed with the proxy statement, or you may grant your proxy electronically via the Internet or by telephone by following the instructions on the proxy card. If your shares are held in “street name,” which means your shares are held of record by a broker, bank or other nominee, you should review the Notice of Internet Availability of Proxy Materials used by that firm to determine whether and how you will be able to submit your proxy by telephone or over the Internet. Submitting a proxy over the Internet, by telephone or by mailing a proxy card will ensure your shares are represented at the annual meeting. A list of stockholders entitled to vote at the annual meeting will be available for examination by stockholders of record atwww.virtualshareholdermeeting.com/CMRC2026 during the annual meeting.

By Order Of The Board Of Directors

Chuck Cassidy

Corporate Secretary

Notice of AnnualMeeting of Stockholders

Dated: May 14, 2026

Time: 8:00 a.m., Central Time

Location: Virtually at www.virtualshareholdermeeting.com/CMRC2026

Table of Contents

COMMERCE.COM, INC.

11920 Alterra Parkway, D11 / Suite 100, 8th Floor

Austin, Texas 78758