X0306 4 2016-10-05 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 2016-10-05 4 S 0 25000 18.0511 D 194757 D Common Stock 200000 I By Trust The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 2, 2016. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.77 to $18.28, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. 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 2016-10-07