Exhibit 99.1 FOR IMMEDIATE RELEASE Forrester Research Reports 2026 First-Quarter Financial Results CAMBRIDGE, Mass., May 6, 2026 — Forrester Research, Inc. (Nasdaq: FORR) today announced financial results for the first quarter ended March 31, 2026, with contract value at $285.3 million, down 3% compared with the prior year. "We are seeing continued momentum in our metrics, which has allowed us to increase the low-to-midpoint range of our revenue guidance for 2026," said CEO and Chairman George F. Colony. "F ...