Magnite CEO sells 293,968 shares after option exercise

Magnite, Inc. CEO Michael G. Barrett exercised stock options covering 293,968 shares of common stock at an exercise price of $5.80 per share and sold the same number of shares at $22.72 per share on August 6, 2026.

Rhea-AI Filing Summary

Magnite, Inc. CEO Michael G. Barrett exercised stock options covering 293,968 shares of common stock at an exercise price of $5.80 per share and sold the same number of shares at $22.72 per share on August 6, 2026. The options were granted as compensation, were fully vested and immediately exercisable, and were due to expire on March 17, 2027. The exercise and subsequent sale were carried out under a Rule 10b5-1 trading plan adopted on March 13, 2026.

Insider Trade Summary 10b5-1

Exercise and Sale: 293,968 shares ($4.97M approx. pre-tax spread)

Exercise and Sale 3 txns

Insider BARRETT MICHAEL G.

Role CEO

Sold 293,968 shs ($6.68M)

Approx. gross sale proceeds $6.68M

Approx. exercise cost $1.71M

Approx. pre-tax spread $4.97M

Type	Security	Shares	Price	Value
Exercise	Stock Option (right to buy) F1, F3, F2	293,968	$0.00	$0.00
Exercise	Common Stock F1	293,968	$5.80	$1.71M
Sale	Common Stock F1	293,968	$22.72	$6.68M

Holdings After Transaction: Stock Option (right to buy) — 0 contracts (Direct); Common Stock — 403,074 shares (Direct)

Footnotes (3)

1. F1. This exercise and subsequent sale were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 13, 2026.
2. F2. The stock options have fully vested and are immediately exercisable.
3. F3. Granted as compensation for services.

Key Figures

Options exercised: 293,968 shares Exercise price: $5.80 per share Shares sold: 293,968 shares +3 more

6 metrics

Options exercised 293,968 shares Stock options converted into common stock on August 6, 2026

Exercise price $5.80 per share Exercise price of stock options exercised by CEO Michael G. Barrett

Shares sold 293,968 shares Common shares sold on August 6, 2026 following option exercise

Sale price $22.72 per share Sale price for Magnite common stock sold by Michael G. Barrett

Option expiration date March 17, 2027 Expiration date of the stock options that were exercised

Trading plan adoption date March 13, 2026 Date the Rule 10b5-1 trading plan governing these trades was adopted

Key Terms

Rule 10b5-1 trading plan, Stock Option (right to buy, Exercise or conversion of derivative security

3 terms

Rule 10b5-1 trading plan regulatory

"This exercise and subsequent sale were made pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Stock Option (right to buy financial

"security_title: Stock Option (right to buy) reported as derivative"

Exercise or conversion of derivative security financial

"transaction_code_description: Exercise or conversion of derivative security"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider stock transaction did Magnite (MGNI) disclose for its CEO?

Magnite disclosed that CEO Michael G. Barrett exercised stock options for 293,968 shares at $5.80 per share and sold the same number of common shares at $22.72 per share on August 6, 2026, as part of a pre-arranged Rule 10b5-1 trading plan.

How many Magnite (MGNI) shares did Michael G. Barrett sell and at what price?

Michael G. Barrett sold 293,968 shares of Magnite common stock at a price of $22.72 per share. These shares were acquired the same day through the exercise of stock options and the transactions were executed under a Rule 10b5-1 trading plan.

At what price did the Magnite (MGNI) CEO exercise his stock options?

The CEO exercised stock options at an exercise price of $5.80 per share for 293,968 shares of Magnite common stock. These options were fully vested, granted as compensation, and were immediately exercisable before being converted and the shares sold.

Were the Magnite (MGNI) CEO’s option exercise and sale under a Rule 10b5-1 plan?

Yes. The exercise and subsequent sale by Michael G. Barrett were conducted under a Rule 10b5-1 trading plan adopted on March 13, 2026. This indicates the transactions followed a pre-established schedule rather than discretionary timing.

What was the origin and status of the options Magnite (MGNI) CEO exercised?

The stock options exercised by the CEO were granted as compensation for services and were fully vested and immediately exercisable. They related to 293,968 underlying shares of common stock and were scheduled to expire on March 17, 2027 before being fully exercised.

Did Michael G. Barrett retain any of the Magnite (MGNI) shares from this option exercise?

In this reported sequence, Michael G. Barrett exercised options for 293,968 shares and sold 293,968 shares of common stock on the same date. The disclosure does not list any resulting common stock holdings tied specifically to these transactions.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/07/2026 - 05:01 PM Accepted by SEC EDGAR 08/07/2026 - 05:00 PM Learn about SEC filing dates

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^*

BARRETT MICHAEL G.

(Last) (First) (Middle)

C/O MAGNITE, INC.

1250 BROADWAY, 9TH FLOOR

(Street)

NEW YORK NEW YORK 10001

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
MAGNITE, INC. [ MGNI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/06/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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

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	08/06/2026		M(1)		293,968	A	$5.8	697,042	D
Common Stock	08/06/2026		S(1)		293,968	D	$22.72	403,074	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
Stock Option (right to buy)	$5.8	08/06/2026		M(1)			293,968	(2)	03/17/2027	Common Stock	293,968	$0(3)	0	D

Explanation of Responses:

1. This exercise and subsequent sale were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 13, 2026.

2. The stock options have fully vested and are immediately exercisable.

3. Granted as compensation for services.

Remarks:

	/s/ Aaron Saltz, attorney-in-fact	08/07/2026
	** 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.
* Form 4: SEC 1474 (03-26)