Magnite director sells 5,000 shares under plan

MAGNITE, INC. director Paul Caine reported selling 5,000 shares of common stock on August 10, 2026 in an open-market transaction.

Rhea-AI Filing Summary

MAGNITE, INC. director Paul Caine reported selling 5,000 shares of common stock on August 10, 2026 in an open-market transaction. The sale was executed under a Rule 10b5-1 trading plan adopted on August 20, 2025. The weighted average sale price was $24.35 per share, with individual trades executed between $24.07 and $24.91. Following this transaction, Caine directly holds 157,401 shares of MAGNITE common stock.

Insider Trade Summary 10b5-1

Net Seller: 5,000 shares

Net Sell 1 txn

Insider Caine Paul

Role Director

Sold 5,000 shs ($122K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	5,000	$24.35	$122K

Holdings After Transaction: Common Stock — 157,401 shares (Direct)

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 $24.07 to $24.91, 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: $24.35 per share Sale price range: $24.07 to $24.91 per share +2 more

5 metrics

Shares sold 5,000 shares Common stock sold on August 10, 2026 by director Paul Caine

Weighted average sale price $24.35 per share Weighted average price for the 5,000 shares sold

Sale price range $24.07 to $24.91 per share Range of individual transaction prices for the reported sale

Shares owned after transaction 157,401 shares Direct holdings of Paul Caine following the August 10, 2026 sale

10b5-1 plan adoption date August 20, 2025 Date the Rule 10b5-1 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

"transaction code description: Sale in open market or private transaction"

FAQ

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

What did MAGNITE (MGNI) director Paul Caine report in this Form 4?

Paul Caine reported a sale of 5,000 MAGNITE common shares on August 10, 2026. The transaction was executed in the open market and left him with 157,401 shares held directly.

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

The reported sale used a weighted average price of $24.35 per share. According to the filing, individual trades occurred in multiple transactions at prices ranging from $24.07 to $24.91.

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

After the reported sale, Paul Caine directly owns 157,401 shares of MAGNITE common stock. This figure reflects holdings following the August 10, 2026 open‑market sale of 5,000 shares.

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

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

How many MAGNITE (MGNI) shares did Paul Caine sell in this Form 4?

The Form 4 reports that Paul Caine sold 5,000 shares of MAGNITE common stock. These shares were sold in multiple transactions within the disclosed price range on August 10, 2026.

What does the price range in Paul Caine’s MAGNITE (MGNI) sale mean?

The filing notes the $24.35 price is a weighted average, with shares sold in multiple trades between $24.07 and $24.91. Detailed share counts at each price are available from the reporting person upon request.

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

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Accepted by SEC EDGAR 08/12/2026 - 04:49 PM EDT 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)
08/10/2026

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	08/10/2026		S(1)		5,000	D	$24.35(2)	157,401	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 $24.07 to $24.91, 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	08/12/2026
	** 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)