Magnite President, Revenue reports 2,213-share insider sale

Rhea-AI Filing Summary

Magnite, Inc. (MGNI) reported an insider stock sale by a senior executive. The company’s President, Revenue filed a Form 4 disclosing that on 11/24/2025, they sold 2,213 shares of Magnite common stock at a price of $14.50 per share in an open-market transaction.

After this sale, the executive beneficially owns 268,912 shares of Magnite common stock in direct ownership. The filing notes that the transaction was executed under a pre-arranged Rule 10b5-1 trading plan adopted on 11/24/2023, which is designed to allow insiders to trade shares according to a preset schedule.

Insider Trade Summary

Net Seller: 2,213 shares ($32,089)

Net Sell 1 txn

Insider Buckley Sean Patrick

Role President, Revenue

Sold 2,213 shs ($32K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,213	$14.50	$32K

Holdings After Transaction: Common Stock — 268,912 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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
Estimated average burden
hours per response:			0.5

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

X

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^*

Buckley Sean Patrick

(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)
	President, Revenue

3. Date of Earliest Transaction (Month/Day/Year)
11/24/2025

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	11/24/2025		S(1)		2,213	D	$14.5	268,912	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 November 24, 2023.

	/s/ Aaron Saltz, attorney-in-fact	11/26/2025
	** 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 Magnite (MGNI) disclose in this Form 4 filing?

The Form 4 reports that Magnite’s President, Revenue sold 2,213 shares of common stock at $14.50 per share on 11/24/2025, and now holds 268,912 shares directly.

Who is the reporting person in this Magnite (MGNI) Form 4?

The reporting person is an officer of Magnite, Inc., serving as President, Revenue, and is required to report changes in ownership of company stock.

How many Magnite (MGNI) shares were sold and at what price?

The executive sold 2,213 shares of Magnite common stock at a price of $14.50 per share in the reported transaction.

How many Magnite (MGNI) shares does the executive own after the transaction?

Following the sale, the executive beneficially owns 268,912 shares of Magnite common stock in direct ownership.

Was the Magnite (MGNI) insider sale under a Rule 10b5-1 plan?

Yes. The filing states the sale was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2023 by the reporting person.

What is the significance of Rule 10b5-1 in this Magnite (MGNI) transaction?

Rule 10b5-1 trading plans allow insiders to pre-schedule trades of company stock, helping separate routine share sales from day-to-day market information.