Magnite plan outlines sale of 8,271 MGNI shares

Magnite, Inc. (MGNI) reports a planned sale of 8,271 shares of common stock through Morgan Stanley Smith Barney LLC Executive Financial Services, with trading indicated for NASDAQ.

Rhea-AI Filing Summary

Magnite, Inc. (MGNI) reports a planned sale of 8,271 shares of common stock through Morgan Stanley Smith Barney LLC Executive Financial Services, with trading indicated for NASDAQ. The shares to be sold relate to Restricted Stock Units dated August 15, 2026. Over the past three months, Sean Buckley has reported 10b5-1 plan sales of MGNI common stock, including 67,179 shares on August 6, 2026, 19,233 shares on July 7, 2026, and 19,233 shares on June 17, 2026, for stated gross proceeds in each case.

Key Figures

Planned shares to be sold: 8,271 shares 10b5-1 sale on August 6, 2026: 67,179 shares Proceeds August 6, 2026 sale: $1,645,076.07 +4 more

7 metrics

Planned shares to be sold 8,271 shares Common stock indicated for sale through Executive Financial Services

10b5-1 sale on August 6, 2026 67,179 shares Sean Buckley 10b5-1 sale of MGNI common stock

Proceeds August 6, 2026 sale $1,645,076.07 Gross value for 67,179-share 10b5-1 sale

10b5-1 sale on July 7, 2026 19,233 shares Sean Buckley 10b5-1 sale of MGNI common stock

Proceeds July 7, 2026 sale $404,553.78 Gross value for 19,233-share 10b5-1 sale

10b5-1 sale on June 17, 2026 19,233 shares Sean Buckley 10b5-1 sale of MGNI common stock

Proceeds June 17, 2026 sale $365,427.00 Gross value for 19,233-share 10b5-1 sale

Key Terms

10b5-1, Restricted Stock Units, Executive Financial Services

3 terms

10b5-1 regulatory

"10b5-1 Sales for SEAN BUCKLEY 1250 Broadway, 9th Floor New York NY 10001"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Restricted Stock Units financial

"Common | 08/15/2026 | Restricted Stock Units | Issuer"

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.

Executive Financial Services financial

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

FAQ

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

What does MGNI’s Form 144 filing disclose about upcoming share sales?

The filing discloses an intent to sell 8,271 shares of MGNI common stock through Morgan Stanley Smith Barney LLC Executive Financial Services, tied to Restricted Stock Units dated August 15, 2026 and listed for trading on NASDAQ.

How many MGNI shares are planned to be sold under this Form 144?

The filer indicates a planned sale of 8,271 MGNI common shares. These shares are associated with Restricted Stock Units dated August 15, 2026, and are to be sold through Morgan Stanley Smith Barney LLC Executive Financial Services.

What recent 10b5-1 sales of MGNI stock by Sean Buckley are disclosed?

The disclosure lists three 10b5-1 plan sales of MGNI common stock by Sean Buckley: 67,179 shares on August 6, 2026, 19,233 shares on July 7, 2026, and 19,233 shares on June 17, 2026, each with related gross sale values.

What was the size and value of Sean Buckley’s MGNI sale on August 6, 2026?

On August 6, 2026, Sean Buckley reported selling 67,179 MGNI shares under a 10b5-1 plan for stated gross proceeds of $1,645,076.07, according to the disclosed transaction data.

What MGNI sales did Sean Buckley report on July 7 and June 17, 2026?

Sean Buckley reported 10b5-1 plan sales of 19,233 MGNI shares on July 7, 2026 for $404,553.78, and another 19,233 shares on June 17, 2026 for $365,427.00, as reflected in the recent sales section.

Are the MGNI shares in the Form 144 related to Restricted Stock Units?

Yes. The common shares covered by this notice are linked to Restricted Stock Units dated August 15, 2026, with the issuer listed as the source of these RSUs in the disclosure.

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

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Accepted by SEC EDGAR 08/17/2026 - 04:36 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	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	8271	204541.83	143424157	08/17/2026	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	08/15/2026	Restricted Stock Units	Issuer			8271	08/15/2026	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	08/06/2026	67179	1645076.07
10b5-1 Sales for SEAN BUCKLEY 1250 Broadway, 9th Floor New York NY 10001	Common	07/07/2026	19233	404553.78
10b5-1 Sales for SEAN BUCKLEY 1250 Broadway, 9th Floor New York NY 10001	Common	06/17/2026	19233	365427.00

144: Remarks and Signature

Remarks
Date of Notice	08/17/2026
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)