144 0001882029 XXXXXXXX LIVE 0001023313 FORRESTER RESEARCH, INC. 000-21433 60 Acorn Park Drive Cambridge MA 02140 617-613-6000 Leo Christian Finn Officer Common Stock Robert W. Baird & Co. Incorporated

777 East Wisconsin Avenue Milwaukee WI 53202

7000 82432.70 19466815 08/20/2026 NASDAQ Common Stock 10/01/2022 Restricted stock units granted 10/01/2021 Forrester Research, Inc. N 3562 10/01/2022 Stock-based compensation Common Stock 03/01/2023 Restricted stock units granted 03/01/2022 Forrester Research, Inc. N 1755 03/01/2023 Stock-based compensation Common Stock 10/01/2023 Restricted stock units granted 10/01/2021 Forrester Research, Inc. N 1683 10/01/2023 Stock-based compensation Y 08/20/2026 Ryan Darrah, as attorney-in-fact for Leo Christian Finn