Magnite (MGNI) Insider Sale: CFO Disposes 26,374 Shares

Rhea-AI Filing Summary

David Day, Chief Financial Officer of Magnite, Inc. (MGNI), reported a sale of 26,374 shares of common stock on 08/15/2025. After the reported disposition, he beneficially owned 395,472 shares. The Form 4 was signed by an attorney-in-fact on 08/19/2025. The filing indicates the transaction code G and a reported price of $0 for the disposed shares as stated on the form.

Positive

• None.

Negative

• Officer disposed of 26,374 shares, reducing direct holdings but still retaining 395,472 shares
• Form shows price as $0 for the disposed shares on the line item, and no sale proceeds or execution price are provided in the filing

Insights

Financial Analyst

TL;DR: CFO sold a modest stake; ownership remains meaningful at ~395k shares.

The reported sale of 26,374 shares reduces the CFO's stake but leaves him with 395,472 shares, which remains a material personal holding in absolute terms. The transaction code G typically denotes a transaction under a Rule 10b5-1 trading plan or similar pre-arranged sale, which can indicate the sale was pre-scheduled rather than opportunistic. No proceeds or market price are provided on the form beyond the listed $0 amount, so we cannot assess dollar impact or timing relative to market moves.

Corporate Governance Expert

TL;DR: Routine insider disclosure; appears administrative and compliant.

The Form 4 discloses an officer-level disposition and shows timely attestation via attorney-in-fact. The filing does not allege any irregularity; it documents the post-transaction beneficial ownership. Because the form lists transaction code G, the sale may be pursuant to a pre-established plan, which typically reduces governance concerns about opportunistic insider trading. The record lacks additional context such as plan adoption date or transaction price.

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^*

Day David

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
08/15/2025

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	08/15/2025		G		26,374	D	$0	395,472	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:

	/s/ Aaron Saltz, attorney-in-fact	08/19/2025
	** 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 MGNI insider David Day report on Form 4?

The filing reports a sale of 26,374 shares on 08/15/2025, leaving him with 395,472 shares beneficially owned.

What is the reporting person's role at Magnite (MGNI)?

The reporting person is listed as David Day, the Chief Financial Officer of Magnite, Inc.

What does transaction code G mean on the Form 4?

The form lists transaction code G; the filing itself does not define the code or provide plan adoption details, only the code value is shown.

When was the Form 4 signed and by whom?

The signature block shows the form was signed by Aaron Saltz, attorney-in-fact on 08/19/2025.

How many shares does David Day own after the transaction?

After the reported disposition, he beneficially owns 395,472 shares according to the Form 4.