[Form 4] MAGNITE, INC. Insider Trading Activity

Rhea-AI Filing Summary

Insider sale disclosed: Aaron Saltz, Chief Legal Officer of Magnite, Inc. (MGNI), reported a sale of 6,180 shares of common stock on 09/15/2025 at a price of $23.94 per share. After the sale, Mr. Saltz beneficially owned 223,601 shares, held directly. The filing states the sale was executed under a Rule 10b5-1 trading plan adopted March 14, 2025.

Insights

Financial Analyst

TL;DR: Routine insider sale under a 10b5-1 plan; small relative holding reduction, likely neutral for valuation.

The transaction reports a single sale of 6,180 shares at $23.94, leaving a direct beneficial ownership of 223,601 shares. Execution under a Rule 10b5-1 plan indicates the trade was prearranged, reducing the likelihood the sale was driven by material nonpublic information. The size of the sale appears modest relative to the remaining holdings disclosed, suggesting limited immediate impact on company governance or capital structure.

Corporate Governance Expert

TL;DR: Proper disclosure and use of a 10b5-1 plan reflect governance compliance; transaction is procedural.

The Form 4 is correctly completed showing officer status, transaction date, price, and post-transaction ownership. The stated adoption date of the 10b5-1 plan (March 14, 2025) provides a documented prearrangement for sales, which supports insider trading controls and compliance practices. No amendments or additional disclosures accompany this filing.

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

OMB APPROVAL

OMB Number:			3235-0287
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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).

1. Name and Address of Reporting Person^*

Saltz Aaron

(Last) (First) (Middle)

C/O MAGNITE, INC.

1250 BROADWAY, 15TH 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)
09/15/2025

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	09/15/2025		S(1)		6,180	D	$23.94	223,601	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. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2025.

	/s/ Aaron Saltz	09/17/2025
	** 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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did Aaron Saltz sell in the MGNI Form 4 filing?

The filing shows Aaron Saltz sold 6,180 shares of Magnite common stock on 09/15/2025 at $23.94 per share.

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

After the sale, Aaron Saltz beneficially owned 223,601 shares, held directly.

Was the MGNI sale executed under a trading plan?

Yes. The transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 14, 2025.

What is Aaron Saltz's role at Magnite listed on the Form 4?

He is listed as an Officer with the title Chief Legal Officer and a director status is indicated.

When was the Form 4 signed and filed?

The signature block shows Aaron Saltz signed the form on 09/17/2025.