X0303 5 2010-12-31 0 0 0 0001023313 FORRESTER RESEARCH INC FORR 0001033665 COLONY GEORGE F 400 TECHNOLOGY SQUARE CAMBRIDGE MA 02139 1 1 1 0 Chairman & CEO Common Stock 2010-05-10 5 G 0 10 31.02 D 7640135 D Common Stock 1580 I By Spouse Common Stock 292483 I By Trust The reporting person disclaims beneficial ownership of all securities owned by spouse and this report should not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or any other purpose. These shares are held by the George F. Colony Retained Annuity Trust #4. Maite Garcia, attorney-in-fact for George F. Colony 2011-02-04