Information Services Group Inc.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No. )

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

Information Services Group, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

(203) 517-3100

TO THE STOCKHOLDERS OF

Information Services Group, Inc.:

You are cordially invited to attend the Annual Meeting of Stockholders of Information Services Group, Inc. (the “Company”) on April 24, 2025, at 10:00 a.m. Eastern Time, which will be held at the offices of the Company, 2187 Atlantic Street, Stamford, Connecticut 06902 (the “Annual Meeting”).

Details of the business to be conducted at the Annual Meeting are given in the attached Notice of Annual Meeting of Stockholders and accompanying Proxy Statement.

We are pleased to take advantage of the U.S. Securities and Exchange Commission rule that allows companies to furnish proxy materials to their stockholders over the internet. As a result, we are mailing to our stockholders a Notice of Internet Availability of Proxy Materials (the “Notice”) instead of a paper copy of the accompanying Proxy Statement and our Annual Report to Stockholders for the fiscal year ended December 31, 2024. We believe this process allows us to provide our stockholders with the information they need in a timely manner while reducing environmental impact, lowering costs of printing, and distributing our proxy materials. The Notice contains instructions on how to access our proxy materials over the internet. The Notice also contains instructions on how to request a paper copy of our proxy materials, including the accompanying Proxy Statement, our Annual Report to Stockholders for the fiscal year ended December 31, 2024 and a form of proxy card. The Notice and accompanying Proxy Statement are first being made available to our stockholders beginning on or about March 14, 2025.

Your vote is important to us and to our business. We encourage you to vote by telephone, over the internet or, if you requested to receive printed proxy materials, by marking, signing, dating and returning your proxy card so that your shares will be represented and voted at the Annual Meeting, whether or not you plan to attend. If you attend the Annual Meeting, you will, of course, have the right to revoke the proxy and vote your shares in person.

Sincerely yours,

Michael P. ConnorsChairman and Chief Executive Officer

(203) 517-3100

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

To Be Held April 24, 2025

TO THE STOCKHOLDERS OF

Information Services Group, Inc.:

Notice is hereby given that the Annual Meeting of Stockholders (the “Annual Meeting”) of Information Services Group, Inc. (the “Company”) will be held at the Company’s offices, 2187 Atlantic Street, Stamford, Connecticut 06902 on April 24, 2025, at 10:00 a.m. Eastern Time, for the following purposes:

Stockholders of record at the close of business on February 25, 2025, are entitled to notice of, and to vote at, the Annual Meeting and any adjournment or postponement thereof.

By Order of the Board of Directors,

Michael P. Connors Chairman and Chief Executive Officer

Stamford, Connecticut

IMPORTANT: Your vote is important. Proxy voting permits stockholders unable to attend the Annual Meeting to vote their shares through a proxy. We understand that most stockholders are unable to attend the Annual Meeting. By appointing a proxy, your shares will be represented and voted in accordance with your instructions. If you submit a proxy but do not provide specific instructions on how to vote, the proxies will vote your shares as recommended by the Board of Directors. You can change your voting instructions or revoke your proxy at any time prior to the Annual Meeting by following the instructions described in the accompanying proxy statement. If you hold your shares through an account with a brokerage firm, bank or other nominee, please follow the instructions you receive from them to vote your shares. If you have any questions regarding how to vote, please contact our proxy solicitor, Innisfree M&A Incorporated, toll-free at (877) 717-3930 (banks and brokers may call collect at (212) 750-5833).

Important Notice Regarding the Availability of Proxy Materials

for the Stockholder Meeting to Be Held on April 24, 2025

The Notice of Annual Meeting of Stockholders, Proxy Statement and 2024 Annual Report to Stockholders are available free of charge atwww.proxyvote.com.

Copies of our Annual Report on Form 10-K for the fiscal year ended December 31, 2024, including financial statements and schedules thereto, are also available without charge to stockholders upon written request addressed to: Chief Financial Officer, Information Services Group, Inc., 2187 Atlantic Street, Stamford, Connecticut 06902.