X0609 4 2026-08-18 0001371489 Information Services Group Inc. III 0001760914 Lavieri Todd D. false 400 ATLANTIC STREET STAMFORD CT 06901 false true false false VICE CHAIRMAN 0 Shares of Common Stock 2026-08-18 4 M 0 25880 A 1229573 D Shares of Common Stock 2026-08-18 4 F 0 11481 4.93 D 1219105 D Performance Based RSUs 2026-08-18 4 M 0 25880 0 D 2026-08-18 2029-06-02 Common Stock 25880 0 D On June 2, 2025, the Reporting Person received a grant of RSUs that could be earned based on the achievement of market price goals, which were measured as the average closing price of issuer's common stock over any ten consecutive trading day period beginning with the first anniversary of the award. 100% of the number of RSUs will be earned if the measured market price is $5.00 or above This performance condition was met on August 18, 2026, and 100% of the performance-based RSUs were fully vested. Represents deemed disposition of shares of common stock to the Issuer as a result of withholding of shares of common stock to satisfy tax withholding obligations in connection with vesting of restricted stock units issued in accordance with Rule 16b-3. Includes 1,013 shares acquired under the Information Services Group, Inc. Amended and Restated 2007 Employee Stock Purchase Plan. /s/ Michael A. Sherrick, Attorney-in-Fact 2026-08-20