FORRESTER RESEARCH, INC.

The Board of Directors of Forrester Research, Inc., a Delaware corporation, is soliciting proxies from our stockholders. The proxy will be used at our 2026 Annual Meeting of Stockholders and at any adjournments thereof. You are invited to attend the meeting to be held at 10:00 a.m. Eastern Daylight Time on Tuesday, May 12, 2026. The annual meeting will be held virtually, conducted via live audio webcast, through which you can submit questions and vote online. You may attend the meeting by visitingwww.virtualshareholdermeeting.com/FORR2026. Be sure to have your 16-digit control number included with these proxy materials in order to access the annual meeting. This proxy statement was first made available to stockholders on or about March 31, 2026.

This proxy statement contains important information regarding our annual meeting. Specifically, it identifies the proposals upon which you are being asked to vote, provides information that you may find useful in determining how to vote, and describes voting procedures.

We use several abbreviations in this proxy statement. We call our Board of Directors the “Board”, refer to our fiscal year which began on January 1, 2025 and ended on December 31, 2025 as “fiscal 2025,” and refer to our fiscal year ending December 31, 2026 as “fiscal 2026”. We also refer to ourselves as “Forrester” or the “Company.”