Magnite director sells 10,000 shares of stock

MAGNITE, INC. director Rachel Lam reported a sale of 10,000 shares of common stock on 2026-08-10 in a non-derivative transaction.

Rhea-AI Filing Summary

MAGNITE, INC. director Rachel Lam reported a sale of 10,000 shares of common stock on 2026-08-10 in a non-derivative transaction. The sale was executed at a weighted average price of $24.16 per share, with individual trades ranging from $24.11 to $24.20. Following this sale, Lam directly holds 230,620 shares of MAGNITE common stock.

Insider Trade Summary

Net Seller: 10,000 shares

Net Sell 1 txn

Insider Lam Rachel

Role Director

Sold 10,000 shs ($242K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	10,000	$24.16	$242K

Holdings After Transaction: Common Stock — 230,620 shares (Direct)

Footnotes (1)

1. F1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.11 to $24.20, 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.

Key Figures

Shares sold: 10,000 shares Weighted average sale price: $24.16 per share Approximate transaction value: $241,600 +1 more

4 metrics

Shares sold 10,000 shares Non-derivative sale of common stock on 2026-08-10

Weighted average sale price $24.16 per share Sale in multiple transactions at prices from $24.11 to $24.20

Approximate transaction value $241,600 Derived by multiplying 10,000 shares by $24.16 per share

Shares owned after transaction 230,620 shares Direct common stock holdings following the 10,000-share sale

Key Terms

weighted average price, open market, non-derivative

3 terms

weighted average price financial

"The price reported in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

open market financial

"transaction code description: Sale in open market or private transaction"

An open market is a system where buying and selling of goods, services, or financial assets happen freely without restrictions or special controls. For investors, it means they can trade assets easily and quickly, which helps determine fair prices based on supply and demand. This environment encourages transparency and competition, making it easier to buy or sell with confidence.

non-derivative financial

"transaction_type: non-derivative"

FAQ

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

What did MAGNITE, INC. (MGNI) director Rachel Lam report in this Form 4?

Rachel Lam reported selling 10,000 shares of MAGNITE common stock on 2026-08-10. The transaction was a non-derivative, open-market or private sale, and was executed at a weighted average price within a narrow range around $24 per share.

At what price did Rachel Lam sell MAGNITE (MGNI) shares in this filing?

The reported sale used a weighted average price of $24.16 per share. A footnote explains the shares were sold in multiple transactions at prices ranging from $24.11 to $24.20, and detailed trade data is available upon request from specified parties.

How many MAGNITE (MGNI) shares does Rachel Lam hold after this reported sale?

After the reported transaction, Rachel Lam directly holds 230,620 shares of MAGNITE common stock. This post-transaction holding reflects only the position disclosed in this Form 4 and shows the remaining direct ownership following the 10,000-share sale.

What is the size of the MAGNITE (MGNI) stock sale reported by Rachel Lam in dollar terms?

The sale of 10,000 shares at a weighted average price of $24.16 per share represents an approximate transaction value of $241,600. This value is derived by multiplying the disclosed share amount by the weighted average per-share price reported.

Was the Rachel Lam MAGNITE (MGNI) sale executed as a derivative or non-derivative transaction?

The reported sale was a non-derivative transaction in MAGNITE common stock. It is coded as a “Sale in open market or private transaction”, indicating it involved direct common shares rather than options or other derivative securities.

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

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Accepted by SEC EDGAR 08/12/2026 - 04:51 PM EDT 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^*

Lam Rachel

(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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/10/2026

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	08/10/2026		S		10,000	D	$24.16(1)	230,620	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 $24.11 to $24.20, 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.

Remarks:

	/s/ Aaron Saltz, attorney-in-fact	08/12/2026
	** 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)