X0306 4 2013-05-14 0 0001023313 FORRESTER RESEARCH, INC. FORR 0001280010 MANN GAIL C/O FORRESTER RESEARCH, INC. 60 ACORN PARK DRIVE CAMBRIDGE MA 02140 0 1 0 0 Chief Legal Officer Common Stock 2013-05-14 4 M 0 542 0.00 A 1223 D Common Stock 2013-05-14 4 F 0 171 35.94 D 1052 D Restricted Stock Units 0.00 2013-05-14 4 M 0 542 D common stock 542 1625 D Represents the conversion, upon vesting, of restricted stock units into common stock. Represents shares withheld by the Issuer to satisfy tax withholding obligations upon the vesting on May 14, 2013 of the restricted stock units awarded to the reporting person on May 14, 2012. The award includes a provision for the withholding of shares by the Issuer to satisfy withholding taxes due as a result of the vesting of the award. Each Restricted Stock Unit represents the right to receive, following vesting, one share of Forrester Research, Inc. common stock. On May 14, 2012, the reporting person was granted 2167 Restricted Stock Units that vest and convert into common stock in four equal and consecutive installments beginning on the first anniversary of the grant date. Each Restricted Stock Unit is the equivalent of one share of Forrester Research, Inc. common stock. Maite Garcia, attorney-in-fact to Gail S. Mann 2013-05-16