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 * ADDANTE FRANK   2. Issuer Name and Ticker or Trading Symbol RUBICON PROJECT, INC. [RUBI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) See Remarks (Last) (First) (Middle) C/O THE RUBICON PROJECT, INC., 12181 BLUFF CREEK DRIVE, 4TH FLOOR 3. Date of Earliest Transaction (Month/Day/Year) 03/14/2014 (Street) LOS ANGELES, CA 90094 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ 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 Class A Common Stock 03/14/2014   A   431,669 (1) (2) A $ 0 (3) 2,859,374 (2) D   Class A Common Stock 03/14/2014   A   100,000 (4) A $ 0 (3) 2,959,374 D   Class A Common Stock 04/07/2014   J(5)   2,959,374 D (5) 0 D   Common Stock 04/07/2014   J(5)   2,959,374 A (5) 2,959,374 D   Class A Common Stock 04/07/2014   J(5)   1,250 D (5) 0 I By Spouse Common Stock 04/07/2014   J(5)   1,250 A (5) 1,250 I By Spouse

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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
ADDANTE FRANK C/O THE RUBICON PROJECT, INC. 12181 BLUFF CREEK DRIVE, 4TH FLOOR LOS ANGELES, CA 90094	X		See Remarks

Signatures

/s/ Jonathan Feldman, attorney-in-fact		04/11/2014
**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)	Represents shares of restricted stock that vest as follows: (a) November 15, 2014: 269,793 shares; (b) May 15, 2015: 53,959 shares; (c) November 15, 2015: 53,959 shares; and (d) May 15, 2016: 53,958 shares.
(2)	The number of securities reported has been adjusted to give effect to the 1-for-2 reverse stock split of The Rubicon Project, Inc.'s (the "Issuer") Class A Common Stock, which was effected on March 18, 2014.
(3)	Granted as compensation for services.
(4)	Represents shares of restricted stock that vest in semi-annual installments on November 15 and May 15 over a four-year period commencing on November 15, 2014.
(5)	Pursuant to the Sixth Amended and Restated Certificate of Incorporation of the Issuer filed prior to the completion of the Issuer's initial public offering, each share of Class A Common Stock was reclassified and converted into one share of a single class of Common Stock on April 7, 2014. Such reclassification was exempt under Rule 16b-7 of the Securities Exchange Act of 1934, as amended.
Remarks: Chief Executive Officer and Chief Product Architect.

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