Magnite director sells 5,000 shares at $23.53

MAGNITE director Paul Caine sold 5,000 shares under a pre-arranged Rule 10b5-1 trading plan and now directly holds 144,901 shares.

Available on EDGAR 09/11/2026 - 04:12 PM EDT Accepted by SEC EDGAR 09/11/2026 - 04:11 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

MAGNITE, INC. (MGNI) director Paul Caine reported selling 5,000 shares of common stock on September 10, 2026 in an open-market transaction at a weighted average price of $23.53 per share, under a Rule 10b5-1 trading plan adopted on August 20, 2025. After this sale, he directly holds 144,901 shares of MAGNITE common stock. The shares were sold in multiple trades at prices between $23.22 and $23.63 per share.

Insider Trade Summary 10b5-1

Net Seller: 5,000 shares

Net Sell 1 txn

Insider Caine Paul

Role Director

Sold 5,000 shs ($118K)

Share of Position Sold 3.3%

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	5,000	$23.53	$118K

Holdings After Transaction: Common Stock — 144,901 shares (Direct)

Holdings Before and After: Common Stock, 149,901 to 144,901 shares (Direct)

Other Insiders: 5 other insiders reported open-market sales of this stock in the 30 days up to this filing.

Footnotes (2)

1. F1. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 20, 2025.
2. F2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.22 to $23.63, 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.

Key Figures

Shares sold: 5,000 shares Weighted average sale price: $23.53 per share Sale price range: $23.22–$23.63 per share +2 more

5 metrics

Shares sold 5,000 shares Common stock sale reported for September 10, 2026

Weighted average sale price $23.53 per share Average price for 5,000 shares sold on September 10, 2026

Sale price range $23.22–$23.63 per share Range of prices for multiple transactions making up the 5,000-share sale

Shares owned after transaction 144,901 shares Direct holdings of Paul Caine after the September 10, 2026 sale

Rule 10b5-1 plan adoption date August 20, 2025 Date the trading plan governing this sale was adopted

Key Terms

Rule 10b5-1 trading plan, weighted average price, open market or private transaction

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.

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 or private transaction financial

"Sale in open market or private transaction"

FAQ

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

What insider transaction did MAGNITE (MGNI) director Paul Caine report?

Paul Caine reported the sale of 5,000 shares of MAGNITE common stock on September 10, 2026. The transaction was a sale in the open market or a private transaction as described in the Form 4.

At what price did Paul Caine sell MAGNITE (MGNI) shares?

The Form 4 reports a weighted average price of $23.53 per share. A footnote explains the 5,000 shares were sold in multiple trades at prices ranging from $23.22 to $23.63 per share.

How many MAGNITE (MGNI) shares does Paul Caine hold after this transaction?

After the reported sale, Paul Caine directly holds 144,901 shares of MAGNITE common stock, as stated in the post-transaction holdings column of the Form 4.

Was the MAGNITE (MGNI) insider sale made under a Rule 10b5-1 plan?

Yes. A 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.

How many MAGNITE (MGNI) insider transactions are reported in this Form 4?

The Form 4 reports one non-derivative transaction: a sale of 5,000 shares of common stock. There are no derivative transactions or gifts reported in this filing.

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

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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)
09/10/2026

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	09/10/2026		S(1)		5,000	D	$23.53(2)	144,901	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.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.22 to $23.63, 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.

Remarks:

	/s/ Aaron Saltz, attorney-in-fact	09/11/2026
	** 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)