RUBI The Rubicon Project Inc

SCHEDULE 13D

SCHEDULE 13D

Item 1. Security and Issuer

The statement on Schedule 13D (the "Schedule 13D") relates to the Common Stock, $0.00001 par value (the "Common Stock"), of Magnite, Inc. (the "Issuer"). The address of the principal executive offices of the Issuer is 1250 Broadway, 15^th Floor, New York, New York 10001

Item 2. Identity and Background

(a) This Schedule 13D is being filed jointly by (i) Edenbrook Capital, LLC ("Edenbrook"), a New York limited liability company, as the investment manager to certain private investment funds, with respect to Common Stock owned by such private investment funds and (ii)  Jonathan Brolin ("Mr. Brolin"), a United States citizen and the principal of Edenbrook with respect to the Common Stock owned by such private investment funds (collectively, the "Reporting Persons").

Any disclosures herein with respect to persons other than the Reporting Persons are made on information and belief after making inquiry to the appropriate party.

(b) The business address of Mr. Brolin and Edenbrook is 116 Radio Circle, Mount Kisco, New York 10549. 

(c) The principal occupation of Edenbrook is to serve as the investment adviser of certain private investment funds. Mr. Brolin's principal occupation or employment is acting as a private investor.  Mr. Brolin is the Managing Member of Edenbrook and, as such, is in the position to determine the investment and voting decisions made by Edenbrook.

(d) The Reporting Persons have not, during the last five years, been convicted in any criminal proceeding (excluding traffic violations or similar misdemeanors).

(e) The Reporting Persons have not, during the last five years, been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgement, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, Federal or State securities laws or finding any violation with respect to such laws.

(f) Edenbrook is a New York limited liability company. Mr. Brolin is a United States citizen.

Item 3. Source and Amount of Funds or Other Considerations

Shares reported represent 6,893,079 shares of the Common Stock of the Issuer.

The net investment costs (including commissions, if any) of the Common Stock directly owned by the private investment funds advised by Edenbrook is approximately $76,609,320.  The Common Stock was purchased with the investment capital of the private investment funds advised by Edenbrook.

Item 4. Purpose of Transaction

The Reporting Persons have acquired their Shares of the Issuer for investment in the ordinary course of business.

The Reporting Persons and their representatives have, from time to time, engaged in, and expect to continue to engage in, discussions with members of management and the board of directors of the Issuer, other current or prospective shareholders, industry analysts, existing or potential strategic partners or competitors, investment and financing professionals, sources of credit and other third parties regarding a variety of matters relating to the Issuer, which may include, among other things, the Issuer's business, management, capital structure and allocation, corporate governance, Board composition and strategic alternatives and direction, and may take other steps seeking to bring about changes to increase shareholder value.

The Reporting Persons continually evaluate their investment in the Common Stock and may in the future seek to acquire additional shares or to dispose of all or a portion of the Common Stock beneficially owned by them. Any such acquisition or disposition may be effected through privately negotiated transactions, in the open market, in block transactions or otherwise. In addition, the Reporting Persons may enter into hedging or derivative transactions with respect to the securities of the Issuer, including Common Stock beneficially owned by them. Any determination to acquire or dispose of securities of the Issuer will depend on a number of factors, including the Issuer's business and financial position and prospects, other developments concerning the Issuer, the price levels of the Common Stock, general market and economic conditions, the availability of financing and other opportunities available to the Reporting Persons.

Except as set forth herein, no Reporting Person has any present plan or proposal which would relate to or

would result in any of the matters set forth in subparagraphs (a)- (j) of Item 4 of Schedule 13D.

Item 5. Interest in Securities of the Issuer

(a) As of the date hereof, Edenbrook and Mr. Brolin may be deemed to be the beneficial owners of 6,893,079 shares of Common Stock, constituting 5.17% of the shares of Common Stock, based upon 133,384,717 shares of Common Stock outstanding as of November 3, 2022, based on the information set forth in the September 30, 2022 quarterly report filed by the Issuer on November 9, 2022

(b) Edenbrook and Mr. Brolin have the sole power to vote or direct the vote of 0 shares of Common Stock; has the shared power to vote or direct the vote of 6,893,079 shares of Common Stock; has the sole power to dispose or direct the disposition of 0 shares of Common Stock; and has the shared power to dispose or direct the disposition of 6,893,079 shares of Common Stock.

(c) The transactions by the Reporting Persons in the securities of the Issuer during the past sixty days are set forth in Schedule A. All such transactions were carried out in open market transactions.

(d) No person other than the Reporting Persons and the private investment funds advised by Edenbrook are known to have the right to receive, or the power to direct the receipt of dividends from, or proceeds from the sale of, the shares of Common Stock held by the Fund and the other private investment funds advised by Edenbrook.             

(e) Not applicable

Item 6. Contracts, Arrangements, Understandings or Relationships with Respect to Securities of the Issuer

The Reporting Persons are parties to an agreement with respect to the joint filing of this Schedule 13D and any amendments thereto.  A copy of such agreement is attached as Exhibit 1 to this Schedule 13 D and is incorporated by reference herein.

The reporting persons wrote 2,000, 13,900 and 5,000 put option contracts expiring in January 2023, January 2024 and August 2024, respectively, which provide that the Reporting Persons will be required to purchase additional shares of Common Stock if the counterparty thereto exercises such put options.

Except as described in this Item 6, none of the Reporting Persons has any contracts, arrangements, understandings or relationships with respect to the securities of the Issuer.

Item 7. Material to Be Filed as Exhibits

Signature

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete, and correct.

EDENBROOK CAPITAL, LLC

/s/ Jonathan Brolin___________

Name:  Jonathan Brolin

Title: Managing Member

/s/ Jonathan Brolin                      

JONATHAN BROLIN

EXHIBIT 1

JOINT FILING AGREEMENT
PURSUANT TO RULE 13D-1(k)

The undersigned acknowledge and agree that the foregoing statement on Schedule 13D is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13D shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained herein and therein but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate.

DATE: November 10, 2022

EDENBROOK CAPITAL, LLC

/s/ Jonathan Brolin__________

Name:  Jonathan Brolin

Title: Managing Member

/s/ Jonathan Brolin__________

JONATHAN BROLIN

Schedule A