Planned sale of 12,479 MGNI common shares

A shareholder of MGNI filed to potentially sell common stock under a resale notice.

Rhea-AI Filing Summary

A shareholder of MGNI filed to potentially sell common stock under a resale notice. The filing covers 12,479 common shares to be sold through Morgan Stanley Smith Barney LLC Executive Financial Services, with an aggregate market value of $308,024.15 and a noted sale date of 08/10/2026 on NASDAQ. The shares relate to multiple tranches of restricted stock originally from issuer grants dated between August 2025 and May 2026.

Key Figures

Shares to be sold: 12,479 shares Aggregate market value: $308,024.15 Proposed sale date: 08/10/2026 +5 more

8 metrics

Shares to be sold 12,479 shares Common stock covered by the resale notice

Aggregate market value $308,024.15 Market value associated with the 12,479 shares

Proposed sale date 08/10/2026 Date associated with the planned sale on NASDAQ

Grant date tranche 1 1,907 shares Restricted stock from issuer grant dated 08/15/2025

Grant date tranche 2 1,496 shares Restricted stock from issuer grant dated 11/15/2025

Grant date tranche 3 5,661 shares Restricted stock from issuer grant dated 02/15/2026

Grant date tranche 4 1,919 shares Restricted stock from issuer grant dated 02/15/2026

Grant date tranche 5 1,496 shares Restricted stock from issuer grant dated 05/15/2026

Key Terms

Form 144, restricted stock, aggregate market value, common stock

4 terms

Form 144 regulatory

"A shareholder of MGNI filed to potentially sell common stock under a resale notice."

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 financial

"The shares relate to multiple tranches of restricted stock originally from issuer grants."

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

aggregate market value financial

"The filing covers 12,479 common shares with an aggregate market value of $308,024.15."

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

common stock financial

"The filing covers 12,479 common shares to be sold through Morgan Stanley."

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

FAQ

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

What does the MGNI Form 144 filing disclose?

The filing discloses a proposed sale of 12,479 MGNI common shares with an aggregate market value of $308,024.15, to be executed through Morgan Stanley Smith Barney LLC Executive Financial Services on or around 08/10/2026.

How many MGNI shares are planned for sale and what is their value?

The shareholder plans for the potential sale of 12,479 common shares of MGNI. The filing lists an aggregate market value of $308,024.15 for these shares in connection with the planned transaction.

What type of MGNI securities are covered by this Form 144?

The Form 144 covers restricted stock in the form of MGNI common shares. The shares come from several issuer grant dates in 2025 and 2026, which are now being registered for potential resale under this notice.

Which broker is handling the potential MGNI share sale?

The potential MGNI share sale is to be handled through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004, as indicated in the resale notice.

On which market is the MGNI stock associated with this Form 144 listed?

The MGNI common stock referenced in this Form 144 is listed on NASDAQ. This listing venue is specified alongside the details of the planned sale and the aggregate market value of the covered shares.

What are the grant dates of the restricted MGNI shares in this filing?

The restricted MGNI shares relate to issuer grants dated 08/15/2025, 11/15/2025, 02/15/2026 and 05/15/2026. Specific share amounts from each of these dates are included in the total of 12,479 common shares.

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

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Accepted by SEC EDGAR 08/10/2026 - 04:16 PM EDT 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	0001778484
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	(212) 243-2769
Name of Person for Whose Account the Securities are To Be Sold	BRIAN GEPHART
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	Officer

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	12479	308024.15	143424157	08/10/2026	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	08/15/2025	Restricted Stock	Issuer			1907	08/15/2025	Not Applicable
Common	11/15/2025	Restricted Stock	Issuer			1496	11/15/2025	Not Applicable
Common	02/15/2026	Restricted Stock	Issuer			5661	02/15/2026	Not Applicable
Common	02/15/2026	Restricted Stock	Issuer			1919	02/15/2026	Not Applicable
Common	05/15/2026	Restricted Stock	Issuer			1496	05/15/2026	Not Applicable

* 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

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	08/10/2026
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/ Brian Lee Gephart
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)