MGNI holder plans sale of 38,596 common shares

MGNI shareholder Michael G Barrett filed a notice to sell 38,596 shares of common stock, with an indicated value of $785,509.65, through Morgan Stanley Smith Barney LLC Executive Financial Services on or after July 15, 2026 on NASDAQ.

Rhea-AI Filing Summary

MGNI shareholder Michael G Barrett filed a notice to sell 38,596 shares of common stock, with an indicated value of $785,509.65, through Morgan Stanley Smith Barney LLC Executive Financial Services on or after July 15, 2026 on NASDAQ.

The shares are to be acquired from the issuer via a stock option exercise paid in cash on July 15, 2026. The filing also lists sales during the past three months, including 75,000, 100,000 and 178,596 shares of common stock on June 29, June 16 and June 15, 2026, respectively, for consideration of $1,462,500.00, $1,750,000.00 and $2,962,061.65.

Key Figures

Shares proposed for sale: 38,596 shares Proposed sale value: $785,509.65 Proposed sale date: 07/15/2026 +3 more

6 metrics

Shares proposed for sale 38,596 shares Common stock covered by the notice to be sold on or after July 15, 2026

Proposed sale value $785,509.65 Indicated value of 38,596 common shares to be sold through Morgan Stanley Smith Barney LLC

Proposed sale date 07/15/2026 Date associated with the planned sale and stock option exercise for the 38,596 shares

Prior sale on 06/29/2026 75,000 shares for $1,462,500.00 Common stock sold by Michael G Barrett during the past three months

Prior sale on 06/16/2026 100,000 shares for $1,750,000.00 Common stock sale disclosed in the three-month history

Prior sale on 06/15/2026 178,596 shares for $2,962,061.65 Largest single common stock sale listed in the recent three-month period

Key Terms

Stock Option Exercise, Executive Financial Services, Securities Sold During The Past 3 Months

3 terms

Stock Option Exercise financial

"Common | 07/15/2026 | Stock Option Exercise | ISSUER"

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.

Executive Financial Services financial

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

Securities Sold During The Past 3 Months regulatory

"144: Securities Sold During The Past 3 Months"

FAQ

What stock sale is disclosed for MGNI in this Form 144 filing?

The filing discloses that Michael G Barrett plans to sell 38,596 shares of MGNI common stock, with an indicated value of $785,509.65, through Morgan Stanley Smith Barney LLC on or after July 15, 2026.

How will the MGNI shares in this Form 144 be acquired before sale?

The 38,596 MGNI shares are to be acquired from the issuer via a Stock Option Exercise on July 15, 2026, with payment in cash, before being sold on NASDAQ through Morgan Stanley Smith Barney LLC.

What prior MGNI stock sales by Michael G Barrett are reported?

The notice lists prior MGNI common stock sales during the past three months: 75,000 shares for $1,462,500.00 on June 29, 2026; 100,000 shares for $1,750,000.00 on June 16, 2026; and 178,596 shares for $2,962,061.65 on June 15, 2026.

On which market are the MGNI shares in this Form 144 expected to trade?

The shares covered by this notice are MGNI common stock expected to be sold on the NASDAQ market, with Morgan Stanley Smith Barney LLC Executive Financial Services named as the broker handling the transaction.

Who is the broker for the MGNI Form 144 stock sale by Michael G Barrett?

The broker identified is Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004, which is listed as handling the proposed sale of 38,596 MGNI common shares.

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Available on EDGAR 07/15/2026 - 04:20 PM Accepted by SEC EDGAR 07/15/2026 - 04:20 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	38596	785509.65	143215003	07/15/2026	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	07/15/2026	Stock Option Exercise	ISSUER			38596	07/15/2026	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	06/29/2026	75000	1462500.00
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	07/15/2026
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)