<SEC-DOCUMENT>0001104659-15-083184-index.html : 20151207
<SEC-HEADER>0001104659-15-083184.hdr.sgml : 20151207
<ACCEPTANCE-DATETIME>20151207111635
ACCESSION NUMBER:		0001104659-15-083184
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20151207
DATE AS OF CHANGE:		20151207

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			RUBICON PROJECT, INC.
		CENTRAL INDEX KEY:			0001595974
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER PROGRAMMING, DATA PROCESSING, ETC. [7370]
		IRS NUMBER:				208881738
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-88535
		FILM NUMBER:		151271757

	BUSINESS ADDRESS:	
		STREET 1:		12181 BLUFF CREEK DRIVE, 4TH FLOOR
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90094
		BUSINESS PHONE:		310-207-0272

	MAIL ADDRESS:	
		STREET 1:		12181 BLUFF CREEK DRIVE, 4TH FLOOR
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90094

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PRIMECAP MANAGEMENT CO/CA/
		CENTRAL INDEX KEY:			0000763212
		IRS NUMBER:				953868081

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		225 SOUTH LAKE AVE STE 400
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91101-3005
		BUSINESS PHONE:		8183049222

	MAIL ADDRESS:	
		STREET 1:		225 SOUTH LAKE AVE SUITE 400
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91101
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>a15-24577_1sc13g.htm
<DESCRIPTION>SC 13G
<TEXT>
Document 1 - file: a15-24577_1sc13g.htm

</DOCUMENT>
</SEC-DOCUMENT>