February 6, 2020

Michael G. Barrett
Chief Executive Officer
Rubicon Project, Inc.
12181 Bluff Creek Drive, 4th Floor
Los Angeles, CA 90094

       Re: Rubicon Project, Inc.
           Registration Statement on Form S-4
           Filed January 30, 2020
           File No. 333-236174

Dear Mr. Barrett:

       This is to advise you that we have not reviewed and will not review your
registration
statement.

        Please refer to Rules 460 and 461 regarding requests for acceleration.
We remind you
that the company and its management are responsible for the accuracy and
adequacy of their
disclosures, notwithstanding any review, comments, action or absence of action
by the staff.

      Please contact Edwin Kim, Attorney-Advisor, at (202) 551-3297 or Jan Woo,
Legal
Branch Chief, at (202) 551-3453 with any questions.



                                                            Sincerely,

                                                            Division of
Corporation Finance
                                                            Office of
Technology
cc:    Andrew Friedman, Esq.