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 OF SECURITIES 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 * Charles River Partnership XIII, LP   2. Issuer Name and Ticker or Trading Symbol RPX Corp [RPXC] 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) ONE BROADWAY, 15TH FLOOR 3. Date of Earliest Transaction (Month/Day/Year) 02/16/2012 (Street) CAMBRIDGE, MA 02142 4. If Amendment, Date Original Filed(Month/Day/Year) 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 02/16/2012   J(1)   1,254,486 D $ 0 7,308,282 (2) (3) (4) D (2) (4)   Common Stock 02/16/2012   J(5)   20,125 D $ 0 7,108,753 (2) (6) (7) D (2) (7)   Common Stock 02/16/2012   J(8)   22 D $ 0 7,308,282 (2) (3) (4) D (2) (4)   Common Stock 02/16/2012   S(9)   35,211 D $ 19.3245 7,308,282 (3) (4) D (4)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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
Charles River Partnership XIII, LP ONE BROADWAY 15TH FLOOR CAMBRIDGE, MA 02142		X
Charles River Friends XIII-A LP c/o Charles River Ventures Inc ONE BROADWAY, 15TH FLOOR CAMBRIDGE, MA 02142		X
Charles River XIII GP, LP ONE BROADWAY 15TH FLOOR CAMBRIDGE, MA 02142		X
Charles River XIII GP, LLC ONE BROADWAY 15TH FLOOR CAMBRIDGE, MA 02142		X

Signatures

/s/ Sarah Reed, as Attorney-in-Fact for Charles River Partnership XIII, LP		02/16/2012
**Signature of Reporting Person		Date
/s/ Sarah Reed, as Attorney-in-Fact for Charles River Friends XIII-A, LP		02/16/2012
**Signature of Reporting Person		Date
/s/ Sarah Reed, as Attorney-in-Fact for Charles River XIII GP, LP		02/16/2012
**Signature of Reporting Person		Date
/s/ Sarah Reed, as Attorney-in-Fact for Charles River XIII GP, LLC		02/16/2012
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Pro rata distribution for no consideraton to partners of Charles River Partnership XIII, LP ("XIII LP").
(2)	The pro rata distribution from XIII LP to its partners, and from one partner to another partner as general partner or member of the distributing partner, reflects a change in form of beneficial ownership only of the ultimate partner, and does not reflect a change in such ultimate partner's pecuniary interest in the securities reported herein.
(3)	Includes 7,108,753 shares held by XIII LP and 199,529 shares held by Charles River Friends XIII-A, LP ("XIII-A LP").
(4)	Charles River XIII GP, LP ("CR XIII GP LP") is the General Partner of XIII LP. Charles River XIII GP, LLC ("CR XIII GP LLC") is the General Partner of both XIII-A LP and CR XIII GP LP. Each of XIII LP, XIII-A LP, CR XIII GP LP and CR XIII GP LLC may be deemed to beneficially own the reported securities, but each disclaims beneficial ownership of such reported securities except to the extent of its pecuniary interest therein. The filing of this statement by any reporting person shall not be deemed an admission that such person is, for purposes of Section 16 of the Securities Exchange Act of 1934 or otherwise, the beneficial owner of any equity securities covered by this statement.
(5)	Pro rata distribution for no consideration from Charles River XIII GP, LP to its partners.
(6)	Represents 7,108,753 shares held by XIII LP.
(7)	CR XIII GP LP is the General Partner of XIII LP. CR XIII GP LLC is the General Partner of CR XIII GP LP. Each of XIII LP, CR XIII GP LP and CR XIII GP LLC may be deemed to beneficially own the reported securities, but each disclaims beneficial ownership of such reported securities except to the extent of its pecuniary interest therein. The filing of this statement by any reporting person shall not be deemed an admission that such person is, for purposes of Section 16 of the Securities Exchange Act of 1934 or otherwise, the beneficial owner of any equity securities covered by this statement.
(8)	Pro rata distribution for no consideration from CR XIII GP LLC to its members.
(9)	Sale by XIII-A LP.

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