Magnite (MGNI) Form 4/A Change in insider ownership (amended)

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

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

1. Name and Address of Reporting Person^*

CLEARSTONE VENTURE PARTNERS III-A LP

(Last) (First) (Middle)

1351 4TH STREET

4TH FLOOR

(Street)

SANTA MONICA CA 90401

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
RUBICON PROJECT, INC. [ RUBI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

Director	X	10% Owner
Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
05/22/2015

4. If Amendment, Date of Original Filed (Month/Day/Year)
05/27/2015

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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	05/22/2015		J(1)(2)		618,934	D	$0(1)(2)	5,570,406	D

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 Securities Underlying Derivative Security (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: 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

Explanation of Responses:

1. This Form 4 amends the Form 4 filed by Mandal Sumant on May 27, 2015 to (i) reflect that the proper reporting person is Clearstone Venture Partners III-A, L.P., a Delaware limited partnership ("CVP III-A"), and not Mandal Sumant, (ii) correct the transaction date and (iii) reflect that the shares distributed on May 22, 2015 were distributed on a pro rata basis for no consideration.

2. On May 22, 2015, CVP III-A distributed, for no consideration, 618,934 shares of Common Stock of the Issuer (the "Shares") to one or more limited partners and to Clearstone Venture Management III, LLC, a Delaware limited liability company ("CVM III"), the general partner of the CVP III-A, representing each such partner's pro rata interest in the shares held by the CVP III-A. This distribution was made in accordance with the exemptions afforded by Rule 16a-13 and Rule 16a-9 of the Securities Exchange Act of 1934, as amended.

	Dana Moraly, Chief Financial Officer and Member, Clearstone Venture Management III, L.L.C., the General Partner of Clearstone Venture Partners III-A, L.P.	05/29/2015
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
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