MGNI insider plans sale of 18,209 common shares

A Form 144 filing related to MGNI reports a proposed sale of up to 18,209 shares of common stock through Morgan Stanley Smith Barney LLC Executive Financial Services, with a notation date of 08/06/2026.

Rhea-AI Filing Summary

A Form 144 filing related to MGNI reports a proposed sale of up to 18,209 shares of common stock through Morgan Stanley Smith Barney LLC Executive Financial Services, with a notation date of 08/06/2026. The securities derive from Restricted Stock Units originally dated 11/06/2019. The filing also lists prior Rule 10b5-1 sales for Douglas Knopper over the past three months, totaling 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

Shares proposed for sale: 18,209 shares 10b5-1 sale 06/16/2026: 37,337 shares Proceeds 06/16/2026 sale: $675,799.70 +4 more

7 metrics

Shares proposed for sale 18,209 shares Common stock linked to RSUs dated 11/06/2019, noted 08/06/2026

10b5-1 sale 06/16/2026 37,337 shares Rule 10b5-1 sale for $675,799.70

Proceeds 06/16/2026 sale $675,799.70 Rule 10b5-1 sale of 37,337 common shares

10b5-1 sale 06/10/2026 10,766 shares Rule 10b5-1 sale for $169,391.17

Proceeds 06/10/2026 sale $169,391.17 Rule 10b5-1 sale of 10,766 common shares

RSU grant date 11/06/2019 Restricted Stock Units that underpin the shares proposed for sale

Exchange NASDAQ Listing venue for the common stock referenced in the filing

Key Terms

Form 144, Restricted Stock Units, 10b5-1 Sales, Executive Financial Services

4 terms

Form 144 regulatory

"Filer Information | | | 144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Restricted Stock Units financial

"Common | 11/06/2019 | 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.

Executive Financial Services financial

"Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza"

FAQ

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

What does the MGNI Form 144 filing disclose about planned stock sales?

The Form 144 related to MGNI discloses a proposed sale of up to 18,209 shares of common stock linked to Restricted Stock Units dated 11/06/2019, to be handled through Morgan Stanley Smith Barney LLC Executive Financial Services.

How many MGNI shares are proposed to be sold under this Form 144?

The filing indicates a proposed sale of up to 18,209 shares of MGNI common stock. These shares are associated with Restricted Stock Units originally granted on 11/06/2019 and are to be sold through a brokerage arrangement.

What recent MGNI stock sales under Rule 10b5-1 are reported for Douglas Knopper?

The filing lists 10b5-1 sales for Douglas Knopper of 37,337 shares for $675,799.70 on 06/16/2026 and 10,766 shares for $169,391.17 on 06/10/2026, both involving MGNI common stock.

What type of MGNI security is covered in this Form 144 notice?

The notice covers common stock of MGNI, originating from Restricted Stock Units dated 11/06/2019. The filing outlines a planned disposition of these equity awards through a brokerage service.

Which broker is handling the proposed MGNI stock sale in this Form 144?

The proposed sale of up to 18,209 MGNI common shares is to be handled by Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004.

On which exchange is the MGNI stock referenced in the Form 144 listed?

The common stock referenced in the Form 144 is listed on the NASDAQ. The filing ties the proposed sale of up to 18,209 shares and prior Rule 10b5-1 sales to MGNI’s NASDAQ-listed common stock.

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

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	0001350876
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	MAGNITE, INC.
SEC File Number	001-36384
Address of Issuer	1250 Broadway, 9th Floor New York NEW YORK 10001
Phone	2122432769
Name of Person for Whose Account the Securities are To Be Sold	Douglas S. Knopper & Abigail L. Knopper TTEES of the Knopper Joint Mgmt Trust 11/15/13
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	Director

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	18209	376380.03	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	11/06/2019	Restricted Stock Units	Issuer			18209	11/06/2019	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	08/06/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/12/2025
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	/s/ Douglas Knopper
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)