[Form 4] MAGNITE, INC. Insider Trading Activity

Rhea-AI Filing Summary

A MagNite insider, Chief Legal Officer Aaron Saltz, sold 8,522 shares of MAGNITE, INC. (MGNI) on 09/19/2025 at $24.50 per share, reducing his direct holdings to 215,079 shares. The filing states the sale was executed under a Rule 10b5-1 trading plan adopted by the reporting person on March 14, 2025, indicating the transactions were preplanned. No additional derivative transactions or amendments are reported.

Insights

Securities Analyst

TL;DR: Insider sale of 8,522 shares under a 10b5-1 plan; appears routine and non-informative for immediate valuation changes.

The reported transaction is a single open-market sale by the Chief Legal Officer for proceeds of $208,?? (8,522 shares x $24.50). The filing explicitly cites a Rule 10b5-1 plan adopted March 14, 2025, which typically reduces the informational content of the sale because timing and amounts can be pre-scheduled. The remaining direct beneficial ownership of 215,079 shares is disclosed; without company-level context (total outstanding shares or recent insider activity), this sale alone is not material to firm valuation.

Corporate Governance Expert

TL;DR: Transaction follows a documented 10b5-1 plan, consistent with routine liquidity management by an executive.

The form identifies Aaron Saltz as an officer and confirms a pre-established trading plan, which aligns with good governance practices for managing perceived insider trading risks. The disclosure is complete for a Form 4: it shows the date, number of shares sold, price, and post-transaction beneficial ownership. There are no amendments, derivative holdings, or indications of unusual timing in the filing itself.

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

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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)
09/19/2025

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	09/19/2025		S(1)		8,522	D	$24.5	215,079	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	09/19/2025
	** 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 report on the Form 4 for MAGNITE, INC. (MGNI)?

The Form 4 reports that Aaron Saltz sold 8,522 shares of MGNI on 09/19/2025 at $24.50 per share, leaving 215,079 shares beneficially owned.

Was the insider sale by Aaron Saltz part of a 10b5-1 trading plan?

Yes. The filing states the sale was effected pursuant to a Rule 10b5-1 trading plan adopted on March 14, 2025.

Does the Form 4 show any derivative transactions or option activity for Aaron Saltz?

No. Table II (derivative securities) contains no reported transactions or holdings in this filing.

Did the filing indicate joint filing or amendments for this transaction?

The filing indicates it was filed by one reporting person and shows no amendment date, so this appears to be an initial Form 4 submission for the reported transaction.