Rapid7 Announces Closing of Initial Public Offering

Boston, MA — July 22, 2015

Rapid7, Inc. (NASDAQ: RPD) a leading provider of security data and analytics solutions, announced today the closing of its initial public offering of 7,417,500 shares of common stock at a price to the public of $16.00 per share. The number of shares issued at closing included the exercise in full of the underwriters’ option to purchase 967,500 additional shares. All of the shares were offered by Rapid7. Rapid7 received approximately $110.4 million in proceeds from the offering, net of underwriting discounts and commissions, but before estimated offering expenses.

Morgan Stanley & Co. LLC and Barclays Capital Inc. acted as joint book-running managers for the offering. Pacific Crest Securities, a division of KeyBanc Capital Markets Inc., William Blair & Company, L.L.C., Raymond James & Associates, Inc., and Cowen and Company, LLC acted as co-managers. The offering was made only by means of a prospectus. A copy of the final prospectus related to the offering may be obtained from Morgan Stanley & Co. LLC, Attention: Prospectus Department, 180 Varick Street, Second Floor, New York, New York 10014; or Barclays Capital Inc., c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, New York 11717, telephone: (888) 603-5847, email: Barclaysprospectus@broadridge.com.

A registration statement related to these securities has been filed with, and declared effective by, the U.S. Securities and Exchange Commission. Copies of the registration statement can also be accessed by visiting the Securities and Exchange Commission website at www.sec.gov. This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.