Magnite (MGNI) director Paul Caine sells 5,000 shares under 10b5-1 plan

Rhea-AI Filing Summary

Magnite, Inc. director Paul Caine reported an open-market sale of 5,000 shares of common stock on July 10, 2026 at a weighted average price of $20.64 per share, with individual trades between $20.31 and $21.25. The sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on August 20, 2025, and Caine now directly owns 162,401 shares of Magnite common stock.

Insider Trade Summary 10b5-1

Net Seller: 5,000 shares ($103,200)

Net Sell 1 txn

Insider Caine Paul

Role Director

Sold 5,000 shs ($103K)

Type	Security	Shares	Price	Value
Sale	Common Stock	5,000	$20.64	$103K

Holdings After Transaction: Common Stock — 162,401 shares (Direct)

Footnotes (1)

1. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 20, 2025. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.31 to $21.25, 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: $20.64 per share Sale price range low: $20.31 per share +2 more

5 metrics

Shares sold 5,000 shares Common stock sold in open-market transaction on July 10, 2026

Weighted average sale price $20.64 per share Average price for 5,000 shares sold on July 10, 2026

Sale price range low $20.31 per share Lowest price among multiple transactions in the reported sale

Sale price range high $21.25 per share Highest price among multiple transactions in the reported sale

Shares owned after transaction 162,401 shares Direct ownership of Magnite common stock following the sale

Key Terms

Rule 10b5-1 trading plan, weighted average price, open-market sale

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 sale financial

"transaction_action: open-market sale of Common Stock"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/14/2026 - 05:51 PM Accepted by SEC EDGAR 07/14/2026 - 05:50 PM Learn about SEC filing dates

FAQ

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

Director Paul Caine reported selling 5,000 shares of Magnite common stock in an open-market transaction on July 10, 2026 at a $20.64 weighted average price, with trades occurring between $20.31 and $21.25 per share.

At what price did the Magnite (MGNI) shares sell in Paul Caine’s latest trade?

The shares sold at a $20.64 weighted average price. Individual trades were executed in multiple transactions at prices ranging from $20.31 to $21.25 per share, reflecting the actual market levels during the sale period.

How many Magnite (MGNI) shares does Paul Caine hold after the reported sale?

After selling 5,000 shares, Paul Caine directly holds 162,401 shares of Magnite common stock. This figure reflects his direct ownership position immediately following the July 10, 2026 open-market transaction reported in the Form 4 data.

Was Paul Caine’s Magnite (MGNI) stock sale made under a Rule 10b5-1 plan?

Yes. The transaction was executed under a Rule 10b5-1 trading plan adopted by Paul Caine on August 20, 2025, indicating the sale was pre-scheduled rather than a discretionary, opportunistic trade based on contemporaneous market conditions.

What type of transaction did Magnite (MGNI) director Paul Caine execute?

Paul Caine executed an open-market sale of 5,000 shares of Magnite common stock on July 10, 2026. The sale is categorized as a non-derivative transaction and is reported with code “S” for a sale in open market or private transaction.

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)
07/10/2026

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	07/10/2026		S(1)		5,000	D	$20.64(2)	162,401	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.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.31 to $21.25, 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	07/14/2026
	** 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)