Exhibit 99.1 FOR IMMEDIATE RELEASE Forrester Research Reports 2025 Third-Quarter Financial Results CAMBRIDGE, Mass., October 30, 2025 — Forrester Research, Inc. (Nasdaq: FORR) today announced financial results for the third quarter ended September 30, 2025, with contract value at $288.1 million, down 7% compared with the prior year. "Despite ongoing market uncertainty, we delivered operating margin and EPS growth this quarter," said CEO and Chairman George F. Colony. "On the heels of the two-year anniversar ...