FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF 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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(Print or Type Responses)

1. Name and Address of Reporting Person *   NEWS CORP 2. Date of Event Requiring Statement (Month/Day/Year) 04/01/2014 3. Issuer Name and Ticker or Trading Symbol RUBICON PROJECT, INC. [RUBI] (Last) (First) (Middle) 1211 AVENUE OF THE AMERICAS 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) NEW YORK, NY 10036 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 Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Class B Common Stock (1) (2) 4,190,063 D Â

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Series D Convertible Preferred Stock	  (3)	  (3)	Class A Common Stock (2)	1,406,062	$ (3)	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
NEWS CORP 1211 AVENUE OF THE AMERICAS NEW YORK, NY 10036	Â	  X	Â	Â

Signatures

/s/ Michael L. Bunder, Senior Vice President, Deputy General Counsel and Corporate Secretary		04/01/2014
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(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)	The Class B Common Stock will automatically convert into Class A Common Stock on a one-for-one basis immediately prior to the completion of the initial public offering of The Rubicon Project, Inc.'s (the "Issuer") Common Stock.
(2)	Pursuant to the Sixth Amended and Restated Certificate of Incorporation (the "A&R Charter") of the Issuer to be filed immediately prior to the completion of the Issuer's initial public offering, effective upon the filing of the A&R Charter each share of Class A Common Stock (including each share of Class A Common Stock issued upon the conversion of shares of the Company's Series D Convertible Preferred Stock upon completion of the Issuer's initial public offering ), and each share of Class B Common Stock that is issued and outstanding and has not been converted into Class A Common Stock, will be automatically reclassified and converted into one share of a single class of Common Stock.
(3)	The Series D Convertible Preferred Stock will automatically convert into 1/2 of a share of Class A Common Stock upon completion of the Issuer's initial public offering of its Common Stock. The Convertible Preferred Stock has no expiration date.

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