Magnite director sells 7,500 shares at $26.50

A MAGNITE, INC. director sold 7,500 MGNI shares under a pre-arranged Rule 10b5-1 trading plan, retaining 137,401 shares afterward.

Rhea-AI Filing Summary

MAGNITE, INC. (MGNI) director Paul Caine reported selling 7,500 shares of common stock on September 17, 2026 at $26.50 per share in an open-market or private transaction. Following this sale, he directly holds 137,401 shares of MAGNITE common stock. The trade was effected pursuant to a Rule 10b5-1 trading plan adopted on August 20, 2025.

Insider Trade Summary 10b5-1

Net Seller: 7,500 shares

Net Sell 1 txn

Insider Caine Paul

Role Director

Sold 7,500 shs ($199K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	7,500	$26.50	$199K

Holdings After Transaction: Common Stock — 137,401 shares (Direct)

Footnotes (1)

1. F1. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 20, 2025.

Key Figures

Shares sold: 7,500 shares Sale price per share: $26.50 per share Shares owned after transaction: 137,401 shares +2 more

5 metrics

Shares sold 7,500 shares Common stock sale reported for September 17, 2026

Sale price per share $26.50 per share Price for the 7,500 MAGNITE shares sold

Shares owned after transaction 137,401 shares Direct holdings of Paul Caine following the sale

Transaction date September 17, 2026 Date of reported sale of common stock

Rule 10b5-1 plan adoption date August 20, 2025 Adoption date of trading plan governing the sale

Key Terms

Rule 10b5-1 trading plan, open market or private transaction, common stock

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 financial

"Sale in open market or private transaction"

common stock financial

"7,500 shares of MAGNITE common stock sold"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

FAQ

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

What insider transaction did MAGNITE, INC. (MGNI) report in this Form 4?

The filing reports that director Paul Caine sold 7,500 shares of MAGNITE common stock on September 17, 2026 in a sale characterized as an open-market or private transaction at $26.50 per share.

How many MGNI shares does Paul Caine hold after this reported sale?

After the reported transaction, Paul Caine directly holds 137,401 shares of MAGNITE, INC. common stock. This figure is reported as his total direct ownership following the sale of 7,500 shares.

Was the MGNI insider trade made under a Rule 10b5-1 trading plan?

Yes. The footnote states the transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by Paul Caine on August 20, 2025, indicating it was pre-arranged under that plan.

What was the sale price per share in the MGNI Form 4 transaction?

The reported transaction price was $26.50 per share for the 7,500 shares of MAGNITE common stock sold on September 17, 2026. The price is identified as a per-share amount for this sale.

What is the nature of Paul Caine’s ownership of MGNI shares after the sale?

The Form 4 identifies his post-transaction holdings of 137,401 shares as held with direct ownership. No indirect ownership relationship is indicated for this transaction.

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

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Available on EDGAR 09/18/2026 - 04:06 PM Accepted by SEC EDGAR 09/18/2026 - 04:06 PM 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).

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^*

Caine Paul

(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)
09/17/2026

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	09/17/2026		S(1)		7,500	D	$26.5	137,401	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 August 20, 2025.

Remarks:

	/s/ Aaron Saltz, attorney-in-fact	09/18/2026
	** 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)