X0304 4 2012-03-01 0001145197 INSULET CORP PODD 0001259094 ROBERTS BRIAN K C/O INSULET CORPORATION 9 OAK PARK DRIVE BEDFORD MA 01730 1 Chief Financial Officer Common Stock 2012-03-01 4 F 0 5082 19.53 D 52995 D This transaction represents the withholding of shares received upon the vesting of restricted stock units to cover the associated tax obligations. Includes 8,000 restricted stock units granted on March 1, 2010 which vest on March 1, 2013; 16,000 restricted stock units granted on March 1, 2011 which vest one-half of the total units on March 1, 2013 and one-half the total units on March 1, 2014; and 7,500 restricted stock units granted on March 1, 2011 which vest one-half of the total units on December 31, 2012 and one-half of the total units on December 31, 2013. Vested shares will be delivered to the reporting person as soon as practicable following a vesting date. /s/ R. Anthony Diehl, attorney in fact 2012-03-02