MICHAEL G. BARRETT - 15 May 2025 Form 4 Insider Report for MAGNITE, INC. (MGNI)

Role: CEO, Director
Signature: /s/ Aaron Saltz, attorney-in-fact
Issuer symbol: MGNI
Transactions as of: 15 May 2025
Net transactions value: -$207,806
Form type: 4
Filing time: 16 May 2025, 17:40:06 UTC
Previous filing: 19 Feb 2025
Next filing: 18 Jun 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
BARRETT MICHAEL G.	CEO, Director	C/O MAGNITE, INC., 1250 BROADWAY, 15TH FLOOR, NEW YORK	/s/ Aaron Saltz, attorney-in-fact	16 May 2025	0001100612

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MGNI	Common Stock	Tax liability	$207,806	-13,086	-1.8%	$15.88	731,708	15 May 2025	Direct	F1, F2

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

Explanation of Responses:

Id	Content
F1	Represents the non-discretionary forfeiture of shares on behalf of the Reporting Person pursuant to an arrangement mandated by the Issuer to cover the tax withholding obligations associated with the vesting of restricted stock units.
F2	Includes 1,577 shares acquired by the Reporting Person on May 15, 2025 under the Issuer's Employee Stock Purchase Plan.