MGNI insider plans sale of 7,649 common shares

David Buonasera filed to sell 7,649 shares of common stock of MGNI through Morgan Stanley Smith Barney LLC Executive Financial Services, with an indicated value of $179,459.56.

Rhea-AI Filing Summary

David Buonasera filed to sell 7,649 shares of common stock of MGNI through Morgan Stanley Smith Barney LLC Executive Financial Services, with an indicated value of $179,459.56. These shares were acquired as restricted stock from the issuer on 08/15/2024. In the past three months, Buonasera has already sold multiple common share blocks, including 9,376 shares for $187,520.00 on 07/01/2026 and 11,233 shares for $202,194.00 on 06/16/2026, along with several smaller transactions.

Key Figures

Planned shares to be sold: 7,649 shares Planned sale value: $179,459.56 Largest recent sale: 11,233 shares for $202,194.00 +3 more

6 metrics

Planned shares to be sold 7,649 shares Common stock to be sold under Form 144

Planned sale value $179,459.56 Indicated value of 7,649 shares of common stock

Largest recent sale 11,233 shares for $202,194.00 Common stock sale on 06/16/2026

Second-largest recent sale 9,376 shares for $187,520.00 Common stock sale on 07/01/2026

Recent sale 07/07/2026 1,224 shares for $25,704.00 Common stock sold during past three months

Restricted stock grant date 08/15/2024 Date shares to be sold were acquired as restricted stock

Key Terms

Restricted Stock, Executive Financial Services, Securities To Be Sold

3 terms

Restricted Stock financial

"Common | 08/15/2024 | Restricted Stock | Issuer"

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.

Executive Financial Services financial

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

Securities To Be Sold regulatory

"144: Securities To Be Sold"

FAQ

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

What does the MGNI Form 144 filing by David Buonasera disclose?

The filing discloses that David Buonasera plans to sell 7,649 MGNI common shares valued at $179,459.56. These shares were acquired as restricted stock from the issuer on August 15, 2024, and are to be sold through Morgan Stanley Smith Barney LLC.

How many MGNI shares is David Buonasera planning to sell under this Form 144?

David Buonasera plans to sell 7,649 shares of MGNI common stock. The proposed sale has an indicated value of $179,459.56, and the transaction is arranged through Morgan Stanley Smith Barney LLC Executive Financial Services.

How were the 7,649 MGNI shares in the Form 144 acquired?

The 7,649 MGNI shares were acquired as restricted stock from the issuer on 08/15/2024. The nature of the acquisition is listed as “Issuer,” with the nature of payment described as “Not Applicable,” indicating a non-cash or equity-based award.

What MGNI stock sales has David Buonasera made in the past 3 months?

Over the past three months, David Buonasera sold several MGNI common stock blocks, including 9,376 shares for $187,520.00 on 07/01/2026 and 11,233 shares for $202,194.00 on 06/16/2026, plus multiple smaller trades in June and July 2026.

What is the largest recent MGNI sale reported for David Buonasera?

The largest recent sale reported is 11,233 MGNI common shares for $202,194.00 on 06/16/2026. Other notable transactions include 9,376 shares for $187,520.00 on 07/01/2026 and multiple smaller June and July 2026 trades.

Which broker is handling David Buonasera’s planned MGNI share sale?

The planned sale of 7,649 MGNI common shares is being handled by Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004, as indicated in the Form 144 filing.

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

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Available on EDGAR 08/06/2026 - 04:23 PM Accepted by SEC EDGAR 08/06/2026 - 04:22 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	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	7649	179459.56	143424157	08/06/2026	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	08/15/2024	Restricted Stock	Issuer			7649	08/15/2024	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	07/07/2026	1224	25704.00
DAVID BUONASERA 1250 Broadway, 9th Floor New York, NY 10001	Common	07/01/2026	9376	187520.00
DAVID BUONASERA 1250 Broadway, 9th Floor New York, NY 10001	Common	06/17/2026	1409	26771.00
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	Remarks: The securities to be sold were acquired upon the vesting of restricted stock during the period of 08/15/2024 through 5/15/2025
Date of Notice	08/06/2026
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)