MGNI Form 144: Affiliate files to sell 1,057 shares

MGNI affiliate filed a Form 144 notice to sell Common stock.

Rhea-AI Filing Summary

MGNI affiliate filed a Form 144 notice to sell Common stock. The filing lists 1,057 shares as securities to be sold through Morgan Stanley Smith Barney LLC. The filing also records a sale during the past three months on 06/01/2026 of 1,409 shares.

Insights

Corporate Finance Counsel

Form 144 lists a planned resale of restricted Common shares and notes a recent disposition.

The notice shows 1,057 shares identified as "Securities To Be Sold" and records a past sale on 06/01/2026 of 1,409 shares. The shares are labeled Restricted Stock.

Timing and cash‑flow treatment for the planned resale are not detailed in the excerpt; subsequent broker reporting or amendment filings would clarify execution method and proceeds.

Key Figures

Shares listed to be sold: 1,057 shares Shares sold in past 3 months: 1,409 shares Broker/Agent: Morgan Stanley Smith Barney LLC

3 metrics

Shares listed to be sold 1,057 shares Securities To Be Sold line

Shares sold in past 3 months 1,409 shares Securities Sold During The Past 3 Months on <date>06/01/2026</date>

Broker/Agent Morgan Stanley Smith Barney LLC Listed as broker in filing header

Key Terms

Restricted Stock, Form 144, Securities Sold During The Past 3 Months

3 terms

Restricted Stock regulatory

"Securities To Be Sold | Common | 05/15/2025 | Restricted Stock"

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.

Form 144 regulatory

"Filer Information | 144: Filer Information"

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.

Securities Sold During The Past 3 Months regulatory

"144: Securities Sold During The Past 3 Months | Common | 06/01/2026"

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Accepted by SEC EDGAR 06/15/2026 - 05:07 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	0001966857
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	DAVID BUONASERA
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	1057	17969.00	143215003	06/15/2026	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	05/15/2025	Restricted Stock	ISSUER			1057	05/15/2025	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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
DAVID BUONASERA 1250 Broadway, 9th Floor New York, NY 10001	Common	06/01/2026	1409	21135.00

144: Remarks and Signature

Remarks
Date of Notice	06/15/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	09/11/2025
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/ David Matthew Buoanesera
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)