Magnite president sells 13,997 shares at $24

Magnite’s President, Product & Operations reported a Rule 10b5-1 planned sale of 13,997 shares at $24.00, leaving her with 441,800 shares.

Available on EDGAR 09/11/2026 - 04:20 PM EDT Accepted by SEC EDGAR 09/11/2026 - 04:19 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

MAGNITE, INC. (MGNI) executive Katie Seitz Evans, President, Product & Operations, reported selling 13,997 shares of common stock on September 11, 2026 at $24.00 per share in an open-market or private transaction. After this sale, she directly holds 441,800 shares of Magnite common stock. The transaction was effected under a Rule 10b5-1 trading plan adopted on June 8, 2026.

Insider Trade Summary 10b5-1

Net Seller: 13,997 shares

Net Sell 1 txn

Insider Evans Katie Seitz

Role See Remarks

Sold 13,997 shs ($336K)

Share of Position Sold 3.1%

Type	Security	Shares	Price	Value
Sale	Common Stock F1	13,997	$24.00	$336K

Holdings After Transaction: Common Stock — 441,800 shares (Direct)

Holdings Before and After: Common Stock, 455,797 to 441,800 shares (Direct)

Other Insiders: 5 other insiders reported open-market sales of this stock in the 30 days up to this filing.

Footnotes (1)

1. F1. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 8, 2026.

Key Figures

Shares sold: 13,997 shares Sale price per share: $24.00 per share Shares held after transaction: 441,800 shares +2 more

5 metrics

Shares sold 13,997 shares Common stock sale reported for September 11, 2026

Sale price per share $24.00 per share Price for the 13,997 shares of common stock sold

Shares held after transaction 441,800 shares Direct holdings of common stock by Katie Seitz Evans after the sale

Rule 10b5-1 plan adoption date June 8, 2026 Date the trading plan governing this sale was adopted

Transactions reported as sales 1 transaction Form 4 transaction summary for this filing

Key Terms

Rule 10b5-1 trading plan, open market or private transaction, beneficial ownership

3 terms

Rule 10b5-1 trading plan regulatory

"The reported transaction was effected 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.

open market or private transaction market

"Sale in open market or private transaction"

beneficial ownership regulatory

"adopted by the Reporting Person on June 8, 2026"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

FAQ

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

What insider transaction did MGNI report for Katie Seitz Evans?

MAGNITE, INC. reported that Katie Seitz Evans sold 13,997 shares of common stock on September 11, 2026 in a sale characterized as an open-market or private transaction at a price of $24.00 per share.

How many MGNI shares does Katie Seitz Evans hold after this Form 4 transaction?

After the reported sale, Katie Seitz Evans directly holds 441,800 shares of MAGNITE, INC. common stock, according to the Form 4 insider filing data.

Was the MGNI insider sale by Katie Seitz Evans under a Rule 10b5-1 trading plan?

Yes. A footnote states that the reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by Katie Seitz Evans on June 8, 2026, and the plan status checkbox is marked accordingly.

What price per share was received in the MGNI insider sale?

The Form 4 reports that the 13,997 shares of MAGNITE, INC. common stock were sold at a price of $24.00 per share, with the price specified on a per-share basis for this transaction.

What role does the reporting person hold at MGNI?

The reporting person, Katie Seitz Evans, is identified in the filing as an officer of MAGNITE, INC., with the remarks specifying her position as President, Product & Operations.

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

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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^*

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)
09/11/2026

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	09/11/2026		S(1)		13,997	D	$24	441,800	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 June 8, 2026.

Remarks:

President, Product & Operations

	/s/ Aaron Saltz, attorney-in-fact	09/11/2026
	** 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)