Brian Gephart - 01 Jan 2026 Form 4 Insider Report for MAGNITE, INC. (MGNI)

Role: CHIEF ACCOUNTING OFFICER
Signature: /s/ Aaron Saltz, attorney-in-fact
Issuer symbol: MGNI
Transactions as of: 01 Jan 2026
Net transactions value: $0
Form type: 4
Filing time: 05 Jan 2026, 19:11:07 UTC
Previous filing: 18 Nov 2025
Next filing: 18 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Gephart Brian	CHIEF ACCOUNTING OFFICER	C/O MAGNITE, INC., 1250 BROADWAY, 9TH FLOOR, NEW YORK	/s/ Aaron Saltz, attorney-in-fact	05 Jan 2026	0001778484

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MGNI	Common Stock	Award	$0	+39,185	+44%	$0.000000	128,534	01 Jan 2026	Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents restricted stock units that vest as follows: 10,613 on February 15, 2027, 2.449 on each May 15, August 15, November 15, and February 15 thereafter until November 15, 2029 and 1,633 on February 15, 2030, subject to 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.
F2	Equity grant under the Company's Amended and Restated 2014 Equity Incentive Plan.

Content

Represents restricted stock units that vest as follows: 10,613 on February 15, 2027, 2.449 on each May 15, August 15, November 15, and February 15 thereafter until November 15, 2029 and 1,633 on February 15, 2030, subject to 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.

Equity grant under the Company's Amended and Restated 2014 Equity Incentive Plan.