Magnite (NASDAQ: MGNI) insider Knopper details planned stock sale and prior 10b5-1 trades

Rhea-AI Filing Summary

Magnite, Inc. insider Douglas Knopper filed to potentially sell shares of the company’s common stock. The notice lists 19,128 shares of common stock associated with restricted stock units granted on 06/07/2022 and indicates use of Morgan Stanley Smith Barney LLC Executive Financial Services as broker. It also reports prior Rule 10b5-1 plan sales of common stock, including 37,337 shares for $675,799.70 on 06/16/2026 and 10,766 shares for $169,391.17 on 06/10/2026.

Key Figures

Planned shares referenced: 19,128 shares Recent 10b5-1 sale 1: 37,337 shares for $675,799.70 Recent 10b5-1 sale 2: 10,766 shares for $169,391.17 +2 more

5 metrics

Planned shares referenced 19,128 shares Common stock tied to restricted stock units granted 06/07/2022 in the securities-to-be-sold section

Recent 10b5-1 sale 1 37,337 shares for $675,799.70 Common stock sold under a 10b5-1 plan on 06/16/2026

Recent 10b5-1 sale 2 10,766 shares for $169,391.17 Common stock sold under a 10b5-1 plan on 06/10/2026

Broker reference number 143424157 Identifier associated with Morgan Stanley Smith Barney LLC Executive Financial Services

Planned sale date reference 08/06/2026 Date associated with the common stock line item on NASDAQ

Key Terms

Restricted Stock Units, 10b5-1 Sales, Common, Executive Financial Services

4 terms

Restricted Stock Units financial

"Common | 06/07/2022 | Restricted Stock Units | Issuer"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

10b5-1 Sales regulatory

"10b5-1 Sales for DOUGLAS KNOPPER 1250 Broadway"

10b5-1 sales are pre-arranged stock-trading plans that let company insiders automatically buy or sell shares according to a fixed schedule or formula, even if they later learn confidential information. Think of it as setting up an automatic thermostat for trades: it creates a clear, documented path that can protect insiders from insider-trading accusations and gives investors a signal about predictable insider activity—though it can also simply be a way for insiders to diversify or raise cash.

Common financial

"Common | Morgan Stanley Smith Barney LLC Executive Financial Services"

Executive Financial Services financial

"Morgan Stanley Smith Barney LLC Executive Financial Services"

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

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Available on EDGAR 08/06/2026 - 04:25 PM Accepted by SEC EDGAR 08/06/2026 - 04:24 PM Learn about SEC filing dates

FAQ

What does this Form 144 filing mean for Magnite (MGNI)?

This Form 144 notice shows Douglas Knopper plans or may plan to sell Magnite common shares, with 19,128 shares referenced and recent 10b5-1 sales disclosed for transparency on insider trading activity.

How many Magnite (MGNI) shares are covered by the new sale notice?

The filing references 19,128 shares of Magnite common stock tied to restricted stock units granted on 06/07/2022. This figure reflects the amount indicated in the securities-to-be-sold section of the notice.

What recent 10b5-1 sales did Douglas Knopper report for Magnite (MGNI)?

The notice lists 10b5-1 plan sales of Magnite common stock: 37,337 shares for $675,799.70 on 06/16/2026 and 10,766 shares for $169,391.17 on 06/10/2026, reflecting prior automated trading activity.

What type of Magnite (MGNI) equity is associated with the 19,128 shares?

The 19,128 shares relate to Restricted Stock Units granted on 06/07/2022. These units convert into common stock under their vesting terms and are now referenced in connection with a potential sale.

Which broker is handling the potential Magnite (MGNI) insider sale?

The filing identifies Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004, as the broker for the Magnite common stock indicated in the notice.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	19128	395375.76	143424157	08/06/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	06/07/2022	Restricted Stock Units	Issuer			19128	06/07/2022	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for DOUGLAS KNOPPER 1250 Broadway, 9th Floor New York NY 10001	Common	06/16/2026	37337	675799.70
10b5-1 Sales for DOUGLAS KNOPPER 1250 Broadway, 9th Floor New York NY 10001	Common	06/10/2026	10766	169391.17

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)