X0303 4 2011-01-25 0000097210 TERADYNE, INC TER 0001198621 BRADLEY MICHAEL A TERADYNE, INC. 600 RIVERPARK DRIVE NORTH READING MA 01864 1 1 0 0 CEO and President Common Stock 2011-01-25 4 M 0 27288 0 A 249458 D Common Stock 2011-01-25 4 F 0 8824 0 D 240634 D Common Stock 2011-01-26 4 M 0 18783 0 A 259417 D Common Stock 2011-01-26 4 F 0 5964 0 D 253453 D Common Stock 2011-01-26 4 M 0 3732 0 A 257185 D Common Stock 2011-01-26 4 F 0 1185 0 D 256000 D Restricted Stock Units 0 2011-01-25 4 A 0 122056 0 A Common Stock 122056 122056 D Restricted Stock Units 0 2011-01-25 4 M 0 27288 0 A Common Stock 27288 27288 D Restricted Stock Units 0 2011-01-26 4 M 0 18783 0 A Common Stock 18783 0 D Restricted Stock Units 0 2011-01-26 4 M 0 3732 0 A Common Stock 3732 0 D Shares/units withheld but not issued to satisfy certain tax withholding obligations. Each Restricted Stock Unit (RSU) represents a right to receive one share of Teradyne, Inc. common stock. These are performance-based RSU's. The number of performance-based RSU's was determined on January 25, 2011 and will vest in four equal annual installments beginning on January 29, 2011. Indicates conversion upon vesting of 25% of the time-based Restricted Stock Units (RSU's) granted on January 25, 2008. The remaining portion of the time-based RSU's will vest on January 25, 2012. Indicates conversion upon vesting of the final portion of the time-based RSU's granted on January 26, 2007. Indicates conversion upon vesting of the final portion of the performance-based RSU's granted on January 26, 2007. \s\ Ryan Driscoll, Deputy General Counsel, by power of attorney 2011-01-27