The Rubicon Project, Inc. S-4

Exhibit 99.3

CONSENT OF PAUL CAINE

Pursuant to Rule 438 promulgated under the Securities Act of 1933, as amended, the undersigned hereby consents to be named in this Registration Statement on Form S-4 (the “Registration Statement”) of The Rubicon Project, Inc. (“Rubicon Project”), and any amendments thereto, as a person who is about to become a director on Rubicon Project’s Board of Directors following the completion of the merger (as defined in the Registration Statement) and consents to the filing of this consent as an exhibit to the Registration Statement.

By:	/s/ Paul Caine
Name:	Paul Caine

Date: January 30, 2020