X0306 4 2018-05-15 0001145197 INSULET CORP PODD 0001667779 Spears Michael P C/O INSULET CORPORATION 600 TECHNOLOGY PARK DRIVE, SUITE 200 BILLERICA MA 01821 1 SVP, QA and RA Common Stock 2018-05-15 4 S 0 6221 86.47 D 45338 D Common Stock 2018-05-15 4 S 0 1893 87.20 D 43445 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 14, 2018. The price reported represents the weighted average sale price of the shares sold. The shares were sold at varying prices in the range of $85.88 to $86.88. The Reporting Person hereby undertakes, upon request of the Staff of the U.S. Securities Exchange Commission, the Issuer or a security holder of the Issuer, to provide full information regarding the number of shares sold at each separate price. Includes 4,328 restricted stock units granted on February 22, 2017, which vest as to one-half of the total units on February 22, 2019 and one-half of the total units on February 22, 2020; 7,477 restricted stock units granted on July 27, 2015, which vest on July 27, 2018; 3,418 restricted stock units granted on February 24, 2016, which vest on February 24, 2019; 5,982 performance share units granted on February 24, 2016, which vest on February 24, 2019; and 4,027 restricted stock units granted on February 14, 2018, which vest as to one-third of the total units on February 14, 2019, one-third of the total units on February 14, 2020 and one-third of the total units on February 14, 2021, subject to continued employment. Vested shares will be delivered to the reporting person as soon as practicable following a vesting date. The price reported represents the weighted average sale price of the shares sold. The shares were sold at varying prices in the range of $86.93 to $87.42. The Reporting Person hereby undertakes, upon request of the Staff of the U.S. Securities Exchange Commission, the Issuer or a security holder of the Issuer, to provide full information regarding the number of shares sold at each separate price. /s/ David Colleran, attorney-in-fact 2018-05-16