X0303 4 2009-12-01 0001145197 INSULET CORP PODD 0001395783 Diehl R Anthony C/O INSULET CORPORATION 9 OAK PARK DRIVE BEDFORD MA 01730 1 Secretary and General Counsel Common Stock 2009-12-01 4 M 0 3000 2.50 A 4249 D Common Stock 2009-12-01 4 S 0 3000 12.37 D 1249 D Employee Stock Option (Right to Buy) 2.50 2009-12-01 4 M 0 3000 0 D 2014-02-23 Common Stock 3000 14649 D This option may be exercised at any time, whether vested or not, but, upon termination of employment, we may repurchase any unvested shares at the exercise price paid for the shares. This option vested 25% on March 1, 2005 with the remainder vesting in equal monthly installments each month thereafter for 36 months, subject to continued employment. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 17, 2007, as modified on August 10, 2009. Includes 400 shares acquired under the Insulet Corporation 2007 Employee Stock Purchase Plan on December 31, 2007. Includes 849 shares acquired under the Insulet Corporation 2007 Employee Stock Purchase Plan on June 30, 2008. /s/ R. Anthony Diehl 2009-12-01