Magnite (NASDAQ: MGNI) insider sells $187.5K in preset plan

Rhea-AI Filing Summary

MAGNITE, INC. (MGNI) director Paul Caine reported selling 7,500 shares of common stock on August 14, 2026, at $25.00 per share in an open-market or private transaction. The sale was effected pursuant to a Rule 10b5-1 trading plan adopted on August 20, 2025, and Caine now directly holds 149,901 shares.

Insider Trade Summary 10b5-1

Net Seller: 7,500 shares

Net Sell 1 txn

Insider Caine Paul

Role Director

Sold 7,500 shs ($188K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	7,500	$25.00	$188K

Holdings After Transaction: Common Stock — 149,901 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: $25.00 Transaction value: $187,500 +1 more

4 metrics

Shares sold 7,500 shares Common stock sale reported for August 14, 2026

Sale price per share $25.00 Per-share price for the 7,500 common shares sold

Transaction value $187,500 7,500 shares sold at $25.00 per share

Shares owned after transaction 149,901 shares Paul Caine’s direct ownership after the August 14, 2026 sale

Key Terms

Rule 10b5-1 trading plan, open market or private transaction, Form 4

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"

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

What insider transaction did MAGNITE, INC. (MGNI) report for Paul Caine?

Paul Caine reported a sale of 7,500 MAGNITE (MGNI) common shares on August 14, 2026. The shares were sold at $25.00 per share in an open-market or private transaction under a pre-established Rule 10b5-1 trading plan.

At what price were the MAGNITE (MGNI) shares sold in Paul Caine’s Form 4?

The reported MAGNITE (MGNI) shares were sold at an average price of $25.00 per share. This transaction involved 7,500 shares of common stock in an open-market or private transaction recorded on August 14, 2026.

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

After the reported sale, Paul Caine directly holds 149,901 shares of MAGNITE (MGNI) common stock. This figure reflects his post-transaction direct ownership as disclosed in the Form 4 filing for the August 14, 2026 transaction.

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

Yes, the sale was effected under a Rule 10b5-1 trading plan adopted on August 20, 2025. Such plans pre-schedule trades, so the timing of this August 14, 2026 transaction was set in advance rather than decided at the moment.

What is the total dollar value of Paul Caine’s reported MAGNITE (MGNI) share sale?

The reported sale of 7,500 MAGNITE (MGNI) shares at $25.00 per share represents a total transaction value of $187,500. This value is computed directly from the disclosed share count and per-share sale price.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/18/2026 - 04:18 PM Accepted by SEC EDGAR 08/18/2026 - 04:16 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)
08/14/2026

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	08/14/2026		S(1)		7,500	D	$25	149,901	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.

Remarks:

	/s/ Aaron Saltz, attorney-in-fact	08/18/2026
	** 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)