MGNI Chief Legal Officer reports tax-related forfeiture, holds 209,384 shares

Rhea-AI Filing Summary

Magnite, Inc. insider Aaron Saltz, Chief Legal Officer, reported an administrative share transaction related to equity compensation. On 11/15/2025, 5,695 shares of Magnite common stock were forfeited at a price of $14.15 per share to cover tax withholding obligations arising from the vesting of restricted stock units. After this tax-related forfeiture, Saltz beneficially owned 209,384 shares of Magnite common stock directly. The transaction was characterized as a non-discretionary forfeiture mandated by the company’s arrangement for handling tax obligations on vesting awards.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Saltz Aaron

(Last) (First) (Middle)

C/O MAGNITE, INC.

1250 BROADWAY, 9TH FLOOR

(Street)

NEW YORK NY 10001

(City) (State) (Zip)

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 LEGAL OFFICER

3. Date of Earliest Transaction (Month/Day/Year)
11/15/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

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. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction 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	11/15/2025		F(1)		5,695	D	$14.15	209,384	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction 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 (Month/Day/Year)		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: 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

Explanation of Responses:

1. 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.

	/s/ Aaron Saltz	11/18/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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FAQ

What insider transaction did MGNI report for its Chief Legal Officer?

Magnite, Inc. (MGNI) reported that Chief Legal Officer Aaron Saltz had 5,695 shares of common stock forfeited on 11/15/2025 to satisfy tax withholding obligations tied to the vesting of restricted stock units.

How many MGNI shares does Aaron Saltz own after the reported transaction?

Following the tax-related forfeiture, Aaron Saltz beneficially owned 209,384 shares of Magnite common stock directly.

What was the price used for the forfeited MGNI shares in this Form 4?

The 5,695 forfeited shares of Magnite common stock were reported at a price of $14.15 per share.

Why were MGNI shares forfeited in this insider transaction?

The filing states the forfeiture was non-discretionary and made on behalf of the reporting person under a company-mandated arrangement to cover tax withholding obligations associated with vesting restricted stock units.

Does this MGNI Form 4 involve any derivative securities?

The Form 4 includes a section for derivative securities, but no derivative transactions or holdings are reported for this event.

What is the relationship of the reporting person to MGNI?

The reporting person, Aaron Saltz, is identified as an officer of Magnite, Inc., serving as the Chief Legal Officer.