Information Services Group Inc. 10-Q

ITEM 5. OTHER INFORMATION ​ During the three months ended March 31, 2026, none of the Company’s directors or officers adopted, modified or terminated a Rule 10 b5- 1 trading arrangement or a non-Rule 10 b 5 - 1 trading arrangement (each as defined in Item 408 of Regulation S-K under the Exchange Act). ​ ITEM 6. EXHIBITS ​ The following exhibits are filed or furnished as part of this report: ​ ​ ​ ​ ​ Exhibit ​ ​ Number ​ Description 31.1 * Certification of Chief Executive Officer Pursuant to SEC Rule 13a−14(a)/15d−14(a). 31.2 * Certification of Chief Financial Officer Pursuant to SEC Rule 13a−14(a)/15d−14(a). 32.1 ** Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. 32.2 ** Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. 101 * The following materials from ISG’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2026 formatted in Inline XBRL (Extensible Business Reporting Language): (i) Condensed Consolidated Balance Sheets, (ii) Condensed Consolidated Statements of Income and Comprehensive Income, (iii) Condensed Consolidated Statement of Stockholders’ Equity, (iv) Condensed Consolidated Statement of Cash Flows and (v) the Notes to Condensed Consolidated Financial Statements. 104 * Cover Page Interactive Data File (formatted as inline XBRL and contained in Exhibit 101). * Filed herewith. ** Furnished herewith. ​ ​ ​ 26 ​ SIGNATURES ​ In accordance with the requirements of the Exchange Act, the registrant caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. ​ ​ ​ INFORMATION SERVICES GROUP, INC. ​ ​ ​ ​ Date: May 8, 2026 /s/ Michael P. Connors ​ Michael P. Connors, Chairman of the ​ Board and Chief Executive Officer ​ ​ ​ ​ Date: May 8, 2026 /s/ Michael A. Sherrick ​ Michael A. Sherrick, Executive Vice ​ President and Chief Financial Officer ​ ​ ​ 27