Notice to Sell 100,000 Shares via Option Exercise

Affiliate files a Rule 144 notice to sell 100,000 shares.

Rhea-AI Filing Summary

Affiliate files a Rule 144 notice to sell 100,000 shares. The filing records a stock option exercise transaction scheduled for 06/16/2026 through Morgan Stanley Smith Barney LLC and indicates cash settlement. The excerpt also shows a prior sale of 178,596 shares on 06/15/2026 for $2,962,061.65.

Key Figures

Proposed shares to sell: 100,000 shares Prior shares sold: 178,596 shares Proceeds from prior sale: $2,962,061.65

3 metrics

Proposed shares to sell 100,000 shares stock option exercise scheduled on <date>06/16/2026</date>

Prior shares sold 178,596 shares sold on <date>06/15/2026</date>

Proceeds from prior sale $2,962,061.65 aggregate amount for sale on <date>06/15/2026</date>

Key Terms

Form 144, Stock Option Exercise, Cash settlement

3 terms

Form 144 regulatory

"144: Securities To Be Sold"

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

"Common | 06/16/2026 | Stock Option Exercise"

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.

Cash settlement financial

"100000 | 06/16/2026 | Cash"

Cash settlement is a process where, instead of exchanging physical assets like stocks or commodities, the parties involved settle the difference in value with money after a contract ends. For investors, it simplifies transactions by avoiding the need to handle or deliver the actual asset, making it quicker and more convenient to complete trades. This method ensures a straightforward way to settle agreements based on their final value.

FAQ

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

What does MGNI's Form 144 report show?

The filing notifies a proposed sale of 100,000 shares via stock option exercise on 06/16/2026. It names Morgan Stanley Smith Barney LLC as the broker and lists cash settlement for the transaction.

Who is listed as the broker for the sale in the Form 144?

The broker is listed as Morgan Stanley Smith Barney LLC, located at 1 New York Plaza, 8th Floor, New York. The broker entry accompanies the 100,000-share option exercise slated for 06/16/2026.

Does the filing show any recent sales by insiders for MGNI?

Yes; the excerpt shows 178,596 shares sold on 06/15/2026 for $2,962,061.65. That prior sale is listed separately from the proposed 100,000-share transaction.

Is the proposed sale in the Form 144 an open-market transaction?

The excerpt labels the method as a stock option exercise with cash settlement and names an issuing party; the filing does not describe specific open-market sale methods.

What dates are relevant in this Form 144 excerpt?

Key dates shown are the proposed transaction date 06/16/2026 for the 100,000-share option exercise and a prior sale date 06/15/2026 for 178,596 shares.

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

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Accepted by SEC EDGAR 06/16/2026 - 04:21 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	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	100000	1750000.00	143215003	06/16/2026	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	06/16/2026	Stock Option Exercise	ISSUER			100000	06/16/2026	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	06/15/2026	178596	2962061.65

144: Remarks and Signature

Remarks
Date of Notice	06/16/2026
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)