Magnite (NASDAQ: MGNI) director sells 37,337 shares in 10b5-1 plan

Rhea-AI Filing Summary

MAGNITE, INC. director Douglas S. Knopper sold 37,337 shares of common stock on August 6, 2026 at $22.72 per share. The sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on December 12, 2025, and he now directly owns 88,473 shares.

Insider Trade Summary 10b5-1

Net Seller: 37,337 shares

Net Sell 1 txn

Insider Knopper Douglas S

Role Director

Sold 37,337 shs ($848K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	37,337	$22.72	$848K

Holdings After Transaction: Common Stock — 88,473 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 December 12, 2025.

Key Figures

Shares sold: 37,337 shares Sale price per share: $22.72 Shares owned after sale: 88,473 shares +2 more

5 metrics

Shares sold 37,337 shares Common stock sale by director on August 6, 2026

Sale price per share $22.72 Average price for the 37,337 shares sold

Shares owned after sale 88,473 shares Direct ownership by Douglas S. Knopper following the transaction

Transaction date August 6, 2026 Date of reported common stock sale

Rule 10b5-1 plan adoption date December 12, 2025 Adoption date of trading plan governing this sale

Key Terms

Rule 10b5-1 trading plan

1 terms

Rule 10b5-1 trading plan regulatory

"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person"

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.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/07/2026 - 05:11 PM Accepted by SEC EDGAR 08/07/2026 - 05:10 PM Learn about SEC filing dates

FAQ

What insider stock transaction did Magnite (MGNI) report for Douglas S. Knopper?

Magnite reported that director Douglas S. Knopper sold 37,337 shares of common stock on August 6, 2026 at $22.72 per share, leaving him with 88,473 shares directly owned after the transaction.

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

Yes. The stock sale by director Douglas S. Knopper was effected pursuant to a Rule 10b5-1 trading plan adopted on December 12, 2025, indicating the transaction was pre-arranged rather than opportunistic based on recent market information.

How many Magnite (MGNI) shares does Douglas S. Knopper own after his August 2026 sale?

After selling 37,337 shares of Magnite common stock, director Douglas S. Knopper directly owns 88,473 shares. This post-transaction holding reflects his remaining direct ownership position as of the August 6, 2026 transaction date reported.

What price per share did the Magnite (MGNI) director receive in the latest reported sale?

Director Douglas S. Knopper sold Magnite common stock at an average price of $22.72 per share on August 6, 2026. The transaction involved 37,337 shares, resulting in total proceeds based on that per-share sale price.

Does the latest Magnite (MGNI) insider report include any option exercises or derivative trades?

The report shows only a single transaction: a sale of 37,337 shares of Magnite common stock by director Douglas S. Knopper. It does not list any option exercises, conversions, or other derivative security transactions for the reported date.

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^*

Knopper Douglas S

(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)
08/06/2026

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	08/06/2026		S(1)		37,337	D	$22.72	88,473	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 December 12, 2025.

Remarks:

	/s/ Aaron Saltz, attorney-in-fact	08/07/2026
	** 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)