Morgan Stanley to sell 10,000 MGNI shares

Morgan Stanley Smith Barney LLC Executive Financial Services submitted a Form 144 notice to sell 10,000 shares of Common Stock of the company (symbol MGNI).

Rhea-AI Filing Summary

Morgan Stanley Smith Barney LLC Executive Financial Services submitted a Form 144 notice to sell 10,000 shares of Common Stock of the company (symbol MGNI). The filing lists restricted stock lots dated 06/12/2024 (7,166 shares) and 06/05/2025 (2,834 shares). The entry shows a filing-related date of 05/19/2026 and identifies NASDAQ as the trading market.

Insights

Securities Counsel

Routine Form 144 notice for a broker-dealer sale of restricted shares.

The filing records a proposed sale notice under Form 144 for 10,000 shares consisting of two restricted-stock lots dated 06/12/2024 and 06/05/2025Morgan Stanley Smith Barney LLC Executive Financial Services.

Timing, sale method, and purchaser counterparties are not provided in the excerpt; subsequent trade specifics would appear in transaction confirmations or broker reports.

Key Figures

Proposed sale notice: 10,000 shares Restricted stock lot: 7,166 shares Restricted stock lot: 2,834 shares +2 more

5 metrics

Proposed sale notice 10,000 shares Form 144 entry

Restricted stock lot 7,166 shares dated 06/12/2024

Restricted stock lot 2,834 shares dated 06/05/2025

Filing-related date 05/19/2026 entry date in the excerpt

Exchange NASDAQ trading market listed in the entry

Key Terms

Form 144, Restricted Stock, Filer

3 terms

Form 144 regulatory

"submitted a Form 144 notice to sell 10,000 shares"

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

"Restricted Stock | Issuer | 7166 | 06/12/2024"

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.

Filer regulatory

"Morgan Stanley Smith Barney LLC Executive Financial Services"

FAQ

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

What does the MGNI Form 144 filing report?

The filing reports a proposed sale notice of 10,000 shares of Common Stock (symbol MGNI). It lists two restricted-stock lots dated 06/12/2024 (7,166 shares) and 06/05/2025 (2,834 shares).

Who is the filer named on the MGNI Form 144?

The filer is listed as Morgan Stanley Smith Barney LLC Executive Financial Services at 1 New York Plaza, New York. The entry identifies that entity as the party submitting the Form 144 notice.

Does the excerpt show when the Form 144 was submitted?

The excerpt includes a date field of 05/19/2026 associated with the filing entry. It also identifies NASDAQ as the trading market for the reported securities.

Which securities and lot dates are listed in the filing?

The filing lists Common restricted stock with two grant dates: 06/12/2024 for 7,166 shares and 06/05/2025 for 2,834 shares, together totaling the reported 10,000 shares.

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

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Accepted by SEC EDGAR 05/19/2026 - 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	0001603808
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	ROBERT SPILLANE
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	10000	133331.00	143215003	05/19/2026	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	06/12/2024	Restricted Stock	Issuer			7166	06/12/2024	Not Applicable
Common	06/05/2025	Restricted Stock	Issuer			2834	06/05/2025	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	05/19/2026
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/ Robert F Spillane
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)