X0306 4 2017-02-15 0 0001560327 Rapid7, Inc. RPD 0001647486 Thomas Corey E. C/O RAPID7, INC. 100 SUMMER STREET BOSTON MA 02110 1 1 0 0 President and CEO Common Stock 2017-02-15 4 F 0 2237 15.07 D 235594 D Common Stock 200000 I By Trust Represents shares withheld by the Issuer to satisfy Mr. Thomas' tax withholding obligation upon the vesting of restricted stock units previously granted to Mr. Thomas on February 2, 2016. Represents shares held by the Corey E. Thomas Irrevocable Trust of 2016, which is administrated by an independent trustee, and is for the benefit of the reporting person's immediate and other family members. The reporting person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of these securities for purposes of Section 16 or for any other purpose. /s/ Peter Kaes, Attorney-in-Fact 2017-02-17