Michael G Barrett files notice to sell 75,000 shares

Michael G Barrett filed a Form 144 notice to sell 75,000 shares of Common Stock via a stock option exercise on 06/29/2026, using Morgan Stanley Smith Barney LLC as broker.

Rhea-AI Filing Summary

Michael G Barrett filed a Form 144 notice to sell 75,000 shares of Common Stock via a stock option exercise on 06/29/2026, using Morgan Stanley Smith Barney LLC as broker. The filing lists cash exercise treatment and shows prior reported sales in June 2026: 100,000 shares on 06/16/2026 and 178,596 shares on 06/15/2026.

Insights

Securities Compliance

Form 144 lists a proposed sale of 75,000 shares via option exercise and prior June sales.

The filing names Michael G Barrett and Morgan Stanley Smith Barney LLC as the broker, and specifies a stock option exercise as the method for the 75,000 shares on 06/29/2026. The receipt of cash is indicated for the exercise.

Prior reported dispositions include 100,000 shares on 06/16/2026 and 178,596 shares on 06/15/2026. Timing and settlement details beyond the listed dates are not provided in the excerpt.

Key Figures

Proposed sale: 75,000 shares Prior sale: 100,000 shares Prior sale: 178,596 shares

3 metrics

Proposed sale 75,000 shares Stock option exercise on 06/29/2026

Prior sale 100,000 shares Sale reported on 06/16/2026

Prior sale 178,596 shares Sale reported on 06/15/2026

Key Terms

Form 144, Stock Option Exercise, Broker

3 terms

Form 144 regulatory

"filed a Form 144 notice to sell 75,000 shares via a stock option exercise"

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.

Stock Option Exercise financial

"Stock Option Exercise | ISSUER | 75000 | 06/29/2026 | Cash"

A stock option exercise is the act of using a previously granted right to buy shares of a company's stock at a specific, predetermined price by paying that price and receiving the shares. It matters to investors because exercising changes who owns the shares (which can dilute existing ownership), can trigger taxable events and shift potential gains or losses, and affects voting power and the company’s outstanding share count—like turning a voucher into an actual product that becomes part of circulating supply.

Broker financial

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

A broker is a licensed professional or firm that helps investors buy and sell financial assets by executing trades on their behalf, acting like a marketplace agent or matchmaker between buyers and sellers. Brokers matter to investors because they provide access to markets, handle order execution and paperwork, and can offer research or advice—services that affect trade speed, costs, and the quality of investment decisions.

FAQ

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

What does Michael G Barrett's Form 144 for MGNI report?

The Form 144 reports a proposed sale of 75,000 shares via a stock option exercise scheduled on 06/29/2026, with Morgan Stanley Smith Barney LLC listed as broker.

How were prior June 2026 sales by Michael G Barrett disclosed?

The filing lists prior dispositions of 100,000 shares on 06/16/2026 and 178,596 shares on 06/15/2026, with cash values shown alongside each sale.

Who is the broker handling the reported sale in the Form 144?

The broker named is Morgan Stanley Smith Barney LLC, with an address listed as 1 New York Plaza, New York, NY, in the provided excerpt.

What method is used to sell the 75,000 shares in the Form 144?

The method specified is a Stock Option Exercise with cash identified as the exercise payment method on 06/29/2026.

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

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Accepted by SEC EDGAR 06/29/2026 - 04:03 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	0001100612
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	MICHAEL G BARRETT
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
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	75000	1462500.00	143215003	06/29/2026	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	06/29/2026	Stock Option Exercise	ISSUER			75000	06/29/2026	Cash

* 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
MICHAEL G BARRETT 1250 Broadway, 9th Floor New York, NY 10001	Common	06/16/2026	100000	1750000.00
MICHAEL G BARRETT 1250 Broadway, 9th Floor New York, NY 10001	Common	06/15/2026	178596	2962061.65

144: Remarks and Signature

Remarks
Date of Notice	06/29/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	03/13/2026
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/ Michael G. Barrett
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)