MGNI Form 144: Proposed resale of Common restricted shares

MGNI proposes the sale of Common restricted securities under a Form 144 notice by an affiliated broker-dealer.

Rhea-AI Filing Summary

MGNI proposes the sale of Common restricted securities under a Form 144 notice by an affiliated broker-dealer. The filing lists recent transactions by David Buonasera on 06/01/2026, 06/15/2026, and 06/16/2026 with share quantities recorded for each date.

Insights

Compliance Attorney

Form 144 records proposed resale activity in restricted/common stock by an affiliated party.

The filing lists Controlled/Restricted Common securities and three recent sale entries attributed to David Buonasera on 06/01/2026, 06/15/2026, and 06/16/2026. The entries include per-date share counts and numeric amounts.

These notices are procedural disclosures of intended resale under applicable rules. Cash-flow treatment and any trading plan references are not present in the excerpt; subsequent filings would report completion or different treatment.

Key Figures

Form type: Form 144 Sale date: 06/16/2026 Shares (06/16/2026): 11,233 shares +5 more

8 metrics

Form type Form 144 Notice of proposed resale

Sale date 06/16/2026 Listed sale entry date

Shares (06/16/2026) 11,233 shares Entry listed under 06/16/2026

Amount (06/16/2026) 202,194.00 Numeric amount on the 06/16/2026 line

Shares (06/15/2026) 1,057 shares Entry listed under 06/15/2026

Amount (06/15/2026) 17,969.00 Numeric amount on the 06/15/2026 line

Shares (06/01/2026) 1,409 shares Entry listed under 06/01/2026

Amount (06/01/2026) 21,135.00 Numeric amount on the 06/01/2026 line

Key Terms

Restricted Stock, Securities To Be Sold, Common

3 terms

Restricted Stock regulatory

"Restricted Stock | ISSUER | 11/15/2024"

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.

Securities To Be Sold regulatory

"144: Securities To Be Sold"

Common market

"Common | Morgan Stanley Smith Barney LLC Executive Financial Services"

FAQ

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

What does MGNI's Form 144 filing mean?

It records a proposed resale of restricted/common shares by an affiliate. The notice lists specific dates and share counts, which disclose intent to sell but do not confirm completed sales or proceeds.

Who is listed as the seller in the MGNI Form 144 excerpt?

The excerpt names David Buonasera with an address and multiple sale entries dated 06/01/2026, 06/15/2026, and 06/16/2026, each showing share quantities and numeric amounts.

How many shares are shown in the June 16, 2026 entry for MGNI?

The June 16, 2026 line shows 11,233 as the numeric share quantity and a second numeric value 202,194.00 on the same row, as recorded in the excerpt.

Does this Form 144 confirm the sales were completed?

No. The Form 144 excerpt documents proposed or reported resale activity; it does not by itself confirm execution or provide final settlement details or net proceeds.

Are the securities described as restricted or unrestricted?

The filing labels the securities as Restricted Stock for the Common shares shown, indicating they were originally subject to transfer restrictions before the proposed resale.

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

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Accepted by SEC EDGAR 06/17/2026 - 04:05 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	1409	26771.00	143215003	06/17/2026	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	11/15/2024	Restricted Stock	ISSUER			1409	11/15/2024	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	06/16/2026	11233	202194.00
DAVID BUONASERA 1250 Broadway, 9th Floor New York, NY 10001	Common	06/15/2026	1057	17969.00
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	06/17/2026
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)