Magnite (MGNI) president forfeits stock to cover RSU taxes

Rhea-AI Filing Summary

MAGNITE, INC. (MGNI) reported an insider tax-related share disposition by officer Katie Seitz Evans, President, Product & Operations. On 2026-08-15, 11,204 shares of common stock were forfeited on a non-discretionary basis to cover tax withholding obligations tied to vesting restricted stock units. Following this withholding transaction, Evans directly holds 485,636 shares of Magnite common stock.

Insider Trade Summary

Net Seller: 11,204 shares

Net Sell 1 txn

Insider Evans Katie Seitz

Role See Remarks

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	11,204	$24.73	$277K

Holdings After Transaction: Common Stock — 485,636 shares (Direct)

Footnotes (1)

1. F1. 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.

Key Figures

Shares withheld/forfeited for taxes: 11,204 shares Reference price per share: $24.73 per share Shares held after transaction: 485,636 shares

3 metrics

Shares withheld/forfeited for taxes 11,204 shares Common stock delivered/withheld on 2026-08-15 to cover tax withholding on RSU vesting

Reference price per share $24.73 per share Price applied to the 11,204 shares used for tax withholding

Shares held after transaction 485,636 shares Direct holdings of MAGNITE, INC. common stock by Katie Seitz Evans after transaction

Key Terms

restricted stock units, non-discretionary forfeiture, tax withholding obligations

3 terms

restricted stock units financial

"associated with the vesting of restricted stock units."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

non-discretionary forfeiture financial

"Represents the non-discretionary forfeiture of shares on behalf of the Reporting Person"

tax withholding obligations financial

"to cover the tax withholding obligations associated with the vesting of restricted stock units."

FAQ

What insider transaction did MAGNITE, INC. (MGNI) report for Katie Seitz Evans?

MAGNITE, INC. reported that Katie Seitz Evans had 11,204 shares of common stock forfeited on 2026-08-15 to satisfy tax withholding obligations from vesting restricted stock units, a non-discretionary, tax-related transaction.

How many MGNI shares does Katie Seitz Evans hold after the reported transaction?

After the 2026-08-15 tax-withholding disposition, Katie Seitz Evans directly holds 485,636 shares of MAGNITE, INC. common stock, as reported in the Form 4 insider filing.

Was the MGNI insider transaction a market sale or a tax withholding event?

The MGNI insider transaction was a tax withholding event, not a market sale. Shares were forfeited non-discretionarily to cover tax obligations associated with vesting restricted stock units.

What price per share was used in the MAGNITE, INC. (MGNI) tax-withholding transaction?

The Form 4 reports a reference price of $24.73 per share for the 11,204 shares delivered or withheld to satisfy tax withholding obligations related to restricted stock unit vesting.

What role does Katie Seitz Evans hold at MAGNITE, INC. (MGNI)?

Katie Seitz Evans is reported as an officer of MAGNITE, INC., serving as President, Product & Operations, according to the Form 4 insider ownership filing.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/18/2026 - 04:24 PM Accepted by SEC EDGAR 08/18/2026 - 04:23 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).

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^*

Evans Katie Seitz

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/15/2026

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	08/15/2026		F(1)		11,204	D	$24.73	485,636	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.

Remarks:

President, Product & Operations

	/s/ Aaron Saltz, attorney-in-fact	08/18/2026
	** 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)