Magnite officer proposes $250K share sale

The proposed shares comprise 3,375 shares associated with performance stock awards and 7,616 associated with restricted stock units.

Available on EDGAR 11/05/2026 - 04:30 PM EST Accepted by SEC EDGAR 11/05/2026 - 04:29 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Magnite, Inc. (MGNI) officer Sean Buckley reported a proposed sale of 10,991 common shares, with an aggregate market value of $250,484.89, through Morgan Stanley Smith Barney LLC. The approximate sale date is November 5, 2026.

The shares to be sold include 3,375 identified as Performance Stock Awards acquired January 1, 2026, and 7,616 identified as Restricted Stock Units acquired November 15, 2023. In the preceding three months, Buckley reported sales identified as 10b5-1 sales: 2,759 shares on August 18, 2026; 8,271 shares on August 17, 2026; and 67,179 shares on August 6, 2026.

Key Figures

Proposed common shares: 10,991 shares Aggregate market value: $250,484.89 Performance Stock Awards shares: 3,375 shares +4 more

7 metrics

Proposed common shares 10,991 shares Approximate sale date November 5, 2026

Aggregate market value $250,484.89 Proposed sale

Performance Stock Awards shares 3,375 shares Acquired January 1, 2026

Restricted Stock Units shares 7,616 shares Acquired November 15, 2023

Reported sale 2,759 shares 10b5-1 sale on August 18, 2026

Reported sale 8,271 shares 10b5-1 sale on August 17, 2026

Reported sale 67,179 shares 10b5-1 sale on August 6, 2026

Key Terms

Performance Stock Awards, Restricted Stock Units, Rule 10b5-1

3 terms

Performance Stock Awards financial

"Performance Stock Awards"

Restricted Stock Units financial

"Restricted Stock Units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Rule 10b5-1 financial

"10b5-1 Sales for Sean Buckley"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

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

How many MGNI shares did Sean Buckley plan to sell?

Sean Buckley, an officer, reported a proposed sale of 10,991 common shares, with an aggregate market value of $250,484.89. The approximate sale date is November 5, 2026.

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

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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	0001865116
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	2122432769
Name of Person for Whose Account the Securities are To Be Sold	SEAN BUCKLEY
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	10991	250484.89	143559468	11/05/2026	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	01/01/2026	Performance Stock Awards	Issuer			3375	01/01/2026	N/A
Common	11/15/2023	Restricted Stock Units	Issuer			7616	11/15/2023	N/A

* 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
10b5-1 Sales for SEAN BUCKLEY 1250 Broadway, 9th Floor New York NY 10001	Common	08/18/2026	2759	68975.00
10b5-1 Sales for SEAN BUCKLEY 1250 Broadway, 9th Floor New York NY 10001	Common	08/17/2026	8271	201106.06
10b5-1 Sales for SEAN BUCKLEY 1250 Broadway, 9th Floor New York NY 10001	Common	08/06/2026	67179	1645076.07

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon the vesting of restricted stock units during the period of 11/15/2023 through 08/15/2026.
Date of Notice	11/05/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	09/10/2025
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/ Sean Buckley
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)