Sec Form 4 Filing - BAIN CAPITAL VENTURE INVESTORS, LLC @ Rapid7, Inc. - 2017-11-13

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person BAIN CAPITAL VENTURE INVESTORS, LLC 2. Issuer Name and Ticker or Trading Symbol Rapid7, Inc. [ RPD] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 200 CLARENDON STREET, 3. Date of Earliest Transaction (MM/DD/YY) 11/13/2017 (Street) BOSTON, MA02116 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 11/13/2017 S 898,517 D $ 18.3 6,682,713 I See footnotes ( 1 ) ( 2 ) ( 3 ) ( 4 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other BAIN CAPITAL VENTURE INVESTORS, LLC 200 CLARENDON STREET BOSTON, MA02116 X Bain Capital Venture Partners 2007, L.P. 200 CLARENDON STREET BOSTON, MA02116 X Bain Capital Venture Fund 2007, L.P. 200 CLARENDON STREET BOSTON, MA02116 X BCIP Venture Associates 200 CLARENDON STREET BOSTON, MA02116 X BCIP VENTURE ASSOCIATES-B 200 CLARENDON STREET BOSTON, MA02116 X KRUPKA MICHAEL A C/O BAIN CAPITAL VENTURE INVESTORS, LLC 200 CLARENDON STREET BOSTON, MA02116 X Agarwal Ajay C/O BAIN CAPITAL VENTURE INVESTORS, LLC 200 CLARENDON STREET BOSTON, MA02116 X Signatures BAIN CAPITAL VENTURE INVESTORS, LLC, By: /s/ Michael A. Krupka, Name: Michael A. Krupka, Title: Managing Director 11/15/2017 Signature of Reporting Person Date BAIN CAPITAL VENTURE PARTNERS 2007, L.P., BY: Bain Capital Venture Investors, LLC, its general partner, By: /s/ Michael A. Krupka, Name: Michael A. Krupka, Title: Managing Director 11/15/2017 Signature of Reporting Person Date BAIN CAPITAL VENTURE FUND 2007, L.P., BY: Bain Capital Venture Partners 2007, L.P., its general partner, BY: Bain Capital Venture Investors, LLC, its general partner, By: /s/ Michael A. Krupka, Name: Michael A. Krupka, Title: Managing Director 11/15/2017 Signature of Reporting Person Date BCIP VENTURE ASSOCIATES, BY: Boylston Coinvestors, LLC, its managing partner, By: /s/ Michael A. Krupka, Name: Michael A. Krupka, Title: Authorized Signatory 11/15/2017 Signature of Reporting Person Date BCIP VENTURE ASSOCIATES-B, BY: Boylston Coinvestors, LLC, its managing partner, By: /s/ Michael A. Krupka, Name: Michael A. Krupka, Title: Authorized Signatory 11/15/2017 Signature of Reporting Person Date By: /s/ Michael A. Krupka 11/15/2017 Signature of Reporting Person Date By: /s/ Ajay Agarwal 11/15/2017 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2007, L.P. ("Partners 2007"), which is the general partner of Bain Capital Venture Fund 2007, L.P. ("Fund 2007"). As a result, Partners 2007 may be deemed to share voting and dispositive power with respect to shares of Common Stock held by Fund 2007. Partners 2007 disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. On November 13, 2017, Fund 2007 sold 785,414 shares of Common Stock. Following such sale Fund 2007 held 5,841,509 shares of Common Stock. ( 2 )On November 13, 2017, BCIP Venture Associates ("BCIP VA"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), sold 111,707 shares of Common Stock. Following such sale BCIP VA held 830,820 shares of Common Stock. ( 3 )On November 13, 2017, BCIP Venture Associates-B ("BCIP VA-B" and together with Fund 2007, and BCIP VA, the "Bain Capital Entities"), whose managing partner is Boylston, sold 1,396 shares of Common Stock. Following such sale BCIP VA-B held 10,384 shares of Common Stock. ( 4 )The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Entities is directed by the Executive Committee of BCVI, which consists of Michael A. Krupka, and Ajay Agarwal. As a result, BCVI may be deemed to share voting and dispositive power with respect to all of the shares of Common Stock held by the Bain Capital Entities. BCVI disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

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