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CORRESP
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CORRESP

 July 14, 2015

VIA EDGAR

 U.S. Securities and Exchange Commission

 Division of Corporation Finance

 100 F Street, N.E.

Washington, D.C. 20549

Attn:
Barbara C. Jacobs

Jeffrey Kauten

Re:
Rapid7, Inc.

Registration Statement on Form S-1

File No. 333-204874

Acceleration Request

Requested Date:
Thursday, July 16, 2015

Requested Time:
4:00 P.M. Eastern Daylight Time

 Ladies and Gentlemen:

In accordance with Rule 461 under the Securities Act of 1933, as amended, the undersigned registrant (the “Registrant”)
hereby requests that the Securities and Exchange Commission (the “Commission”) take appropriate action to cause the above-referenced Registration Statement on Form S-1 (the “Registration Statement”) to
become effective on July 16, 2015, at 4:00 p.m., Eastern Daylight Time, or as soon thereafter as is practicable, or at such later time as the Registrant may orally request via telephone call to the staff (the “Staff”).
This request for acceleration is subject, however, to your receiving a telephone call prior to such time from our legal counsel, Cooley LLP, confirming this request. The Registrant hereby authorizes each of Nicole Brookshire and Richard Segal of
Cooley LLP, counsel to the Registrant, to make such request on its behalf.

 Once the Registration Statement has been declared effective,
please orally confirm that event with Nicole Brookshire of Cooley LLP, counsel to the Registrant, at (617) 937-2357, or in her absence, Richard Segal at (617) 937-2332.

In connection with this request, the Registrant acknowledges that:

•

should the Commission or the Staff, acting pursuant to delegated authority, declare the Registration Statement effective, it does not foreclose the Commission from taking any action with respect to the Registration
Statement;

•

the action of the Commission or the Staff, acting pursuant to delegated authority, in declaring the Registration Statement effective, does not relieve the Registrant from its full responsibility for the adequacy and
accuracy of the disclosure in the Registration Statement; and

•

the Registrant may not assert Staff comments and the declaration of effectiveness as a defense in any proceeding initiated by the Commission or any person under the federal securities laws of the United States.

 Very truly yours,

Rapid7, Inc.

By:

/s/ Steven Gatoff

 Name:

 Title:

 Steven Gatoff

 Chief Financial
Officer

cc:
Corey Thomas, Rapid7, Inc.

 Nicole C. Brookshire, Esq., Cooley LLP

Richard C. Segal, Esq., Cooley LLP

Christopher J. Austin, Esq., Orrick, Herrington & Sutcliffe LLP