MGNI Insider Sale: Rachel Lam Disposes of 15,000 Shares

Rhea-AI Filing Summary

Magnite, Inc. (MGNI) director Rachel Lam reported a sale of common stock on 08/12/2025. The Form 4 shows she disposed of 15,000 shares at a weighted average price of $22.25 per share (transactions ranged from $22.24 to $22.28). After the sale, the reporting person beneficially owned 226,822 shares, reported as direct ownership. The filing was executed by attorney-in-fact Aaron Saltz and dated 08/14/2025. The report indicates routine Section 16 disclosure of an insider sale and includes a footnote offering to provide transaction-level details on request.

Insights

Corporate Governance Expert

TL;DR: Routine insider sale disclosed promptly; no other governance actions or related-party transactions reported.

This Form 4 documents a straightforward sale by a director, with full Section 16 disclosure. The filing identifies the reporting person as a director and shows direct beneficial ownership after the transactions. There are no amendments, option exercises, or derivative transactions reported. From a governance perspective, timely and complete reporting helps meet regulatory obligations and maintain transparency about insider activity.

Securities Analyst

TL;DR: Insider sold 15,000 shares at a weighted average of $22.25; remaining direct holdings reported at 226,822 shares.

The Form 4 provides clear, itemized disclosure of a multi-trade sale executed on a single date with a provided price range. The filing does not include information about intent, planned future transactions, or transactions by related parties. For investors, this is a routine disclosure of insider liquidity rather than a material corporate event.

Insider Trade Summary

Net Seller: 15,000 shares ($333,750)

Net Sell 1 txn

Insider Lam Rachel

Role Director

Sold 15,000 shs ($334K)

Type	Security	Shares	Price	Value
Sale	Common Stock	15,000	$22.25	$334K

Holdings After Transaction: Common Stock — 226,822 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).

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^*

Lam Rachel

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
08/12/2025

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	08/12/2025		S		15,000	D	$22.25(1)	226,822	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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.24 to $22.28, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

	/s/ Aaron Saltz, attorney-in-fact	08/14/2025
	** 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 insider transaction did Rachel Lam report for Magnite (MGNI)?

Rachel Lam reported selling 15,000 shares of Magnite common stock on 08/12/2025 at a weighted average price of $22.25 per share.

How many Magnite shares does the reporting person own after the sale?

The Form 4 reports 226,822 shares beneficially owned following the reported transaction.

What price range were the shares sold at in the Form 4?

The footnote states the shares were sold at prices ranging from $22.24 to $22.28, with a reported weighted average of $22.25.

When was the Form 4 filed and who signed it?

The filing shows execution by attorney-in-fact Aaron Saltz with a signature date of 08/14/2025.

Does the Form 4 report any derivative transactions or option exercises?

No. Table II for derivative securities is empty; only a non-derivative sale of common stock is reported.