FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      
1. Name and Address of Reporting Person * Gephart Brian 2. Issuer Name and Ticker or Trading Symbol MAGNITE, INC. [ MGNI ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable)_____ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
Chief Accounting Officer
(Last)         (First)         (Middle)
C/O MAGNITE, INC., 6080 CENTER DRIVE, 4TH FLOOR
3. Date of Earliest Transaction (MM/DD/YYYY)
7/1/2021
(Street)
LOS ANGELES, CA 90045
(City)       (State)       (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)
 
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. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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  7/1/2021    A    18268 (1) A $0.00 (2) 18268  D   

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 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 of Derivative Security: 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
Stock Option (Right to Buy)  $34.68  7/1/2021    A     13594       (3) 7/1/2031  Common Stock  13594  $0.00 (2) 13594  D   

Explanation of Responses:
(1)  Represents restricted stock units that vest as follows: 4,948 on August 15, 2022, 1,142 on each November 15, February 15, May 15 and August 15 thereafter until May 15, 2025 and 758 on August 15, 2025, subject to the Reporting Person's continued service to the Issuer through each vesting date. This equity grant may be subject to accelerated vesting in the event the Reporting Person's employment is terminated under certain circumstances.
(2)  Equity grant under the Issuer's 2014 Equity Incentive Plan.
(3)  25% of the total number of shares underlying the option will vest on June 28, 2022 and the remaining shares vest 1/36 per month over the next 36 months thereafter, subject to the Reporting Person's continued service to the Issuer through each vesting date. This equity grant may be subject to accelerated vesting in the event the Reporting Person's employment is terminated under certain circumstances.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Gephart Brian
C/O MAGNITE, INC.
6080 CENTER DRIVE, 4TH FLOOR
LOS ANGELES, CA 90045


Chief Accounting Officer

Signatures
/s/ Aaron Saltz, attorney-in-fact 7/2/2021
**Signature of Reporting Person Date
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