Magnite Form 4: Diane Yu disposes 20,000 MGNI shares; holdings 67,481

Rhea-AI Filing Summary

Magnite, Inc. (MGNI) director Diane Yu reported the sale of 20,000 shares on 08/26/2025 at a weighted average price of $25.23, reducing her direct holdings to 67,481 shares. The Form 4 shows the sale was executed in multiple transactions with prices ranging from $25.18 to $25.265 and discloses that the filer will provide transaction-level details on request.

The filing is a routine Section 16 disclosure of a director sale; it was signed by an attorney-in-fact on 08/27/2025. No derivative transactions or other changes in beneficial ownership are reported in this Form 4.

Positive

• Timely and detailed disclosure including weighted average price and price range enhances transparency
• Attorney-in-fact signature indicates authorized filing procedure was followed

Negative

• Director sold 20,000 shares, decreasing direct beneficial ownership to 67,481 shares
• Sale may be viewed as insider liquidity, which could draw investor attention absent explanatory context

Insights

Corporate Governance Expert

TL;DR: A director sold a portion of her stake; the filing is compliant and provides a price range for transparency.

The Form 4 records a straightforward open-market sale of 20,000 common shares by director Diane Yu, leaving 67,481 shares beneficially owned. The filing includes a weighted average sale price of $25.23 and a disclosed price range of $25.18 to $25.265, which is useful for market transparency. Filing by attorney-in-fact is common and acceptable when properly authorized. There is no indication of derivative activity or acquisition, so corporate governance implications are limited to routine insider liquidity.

Securities Analyst

TL;DR: Insider sale of 20,000 shares is material to the individual holding but appears routine and not company-changing.

The sale reduces the reporting person’s direct stake to 67,481 shares. The transaction was executed on 08/26/2025 at a weighted average price of $25.23, with transactions spanning $25.18 to $25.265. The Form 4 does not report any purchases or option exercises that would offset the disposition. For investors, this is a factual disclosure of insider liquidity rather than a signal of corporate events because no additional context or material company developments are included in the filing.

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^*

Yu Diane

(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)
08/26/2025

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	08/26/2025		S		20,000	D	$25.23(1)	67,481	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 $25.18 to $25.265, 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 to this Form 4.

	/s/ Aaron Saltz, attorney-in-fact	08/27/2025
	** 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 did Diane Yu report on Form 4 for MGNI?

The form reports a sale of 20,000 common shares on 08/26/2025 at a weighted average price of $25.23, leaving 67,481 shares beneficially owned.

What price range did the sale of MGNI shares occur at?

The filing discloses trades executed at prices ranging from $25.18 to $25.265; the reported price is a weighted average of $25.23.

Does the Form 4 show any option exercises or derivative transactions for MGNI?

No. Table II (derivative securities) contains no reported transactions; only a non-derivative sale of common stock is reported.

Who signed the Form 4 for Diane Yu?

The document is signed by Aaron Saltz, attorney-in-fact on 08/27/2025, indicating the filing was made by an authorized representative.

Did the filing indicate the sale was part of a 10b5-1 plan?

No. The Form 4 does not check the box indicating the transaction was made pursuant to a 10b5-1 plan.