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  4. [144] MAGNITE, INC. SEC Filing

Magnite (NASDAQ: MGNI) exec plans sale after $2.6M stock-plan trades

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
144

Rhea-AI Filing Summary

MAGNITE, INC. (MGNI) received a notice that officer Sean Buckley intends to sell common stock under Rule 144. The notice covers 2,759 shares of common stock, to be sold through Morgan Stanley Smith Barney LLC, with a reported transaction value of $66,740.21.

The shares derive from restricted stock units, with the planned sale date reported as August 18, 2026 and trading on NASDAQ. Over the prior three months, the notice lists additional Rule 10b5-1 sales by Sean Buckley totaling several tranches of common stock with reported transaction values in the hundreds of thousands of dollars.

Positive

  • None.

Negative

  • None.
Planned shares to be sold 2,759 shares Common stock covered by the Form 144 notice for Sean Buckley
Reported value of planned sale $66,740.21 Transaction value reported for the 2,759 shares of common stock
10b5-1 sale on 08/17/2026 8,271 shares; $201,106.06 Common stock sold for Sean Buckley under a 10b5-1 plan
10b5-1 sale on 08/06/2026 67,179 shares; $1,645,076.07 Common stock sold for Sean Buckley under a 10b5-1 plan
10b5-1 sale on 07/07/2026 19,233 shares; $404,553.78 Common stock sold for Sean Buckley under a 10b5-1 plan
10b5-1 sale on 06/17/2026 19,233 shares; $365,427.00 Common stock sold for Sean Buckley under a 10b5-1 plan
Rule 144 regulatory
"See the definition of "person" in paragraph (a) of Rule 144."
Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.
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.
10b5-1 regulatory
"10b5-1 Sales for SEAN BUCKLEY 1250 Broadway, 9th Floor"
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.
Executive Financial Services financial
"Common | Morgan Stanley Smith Barney LLC Executive Financial Services"

FAQ

What does the Form 144 filing mean for MAGNITE, INC. (MGNI)?
The Form 144 reports that officer Sean Buckley plans to sell 2,759 MGNI common shares under Rule 144. This is an advance notice of a potential sale by an affiliate, not a transaction by Magnite itself.

How many MAGNITE (MGNI) shares is Sean Buckley planning to sell?
Sean Buckley’s notice covers 2,759 shares of MGNI common stock. The filing also reports a related transaction value of $66,740.21, reflecting the value associated with these shares as stated in the notice.

What is the source of the MAGNITE (MGNI) shares listed in this Form 144?
The Form 144 states the shares are from Restricted Stock Units. The securities to be sold section identifies the class as Common and the nature of acquisition as restricted stock units issued by Magnite.

Which broker is handling Sean Buckley’s planned sale of MAGNITE (MGNI) shares?
The notice lists Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY, as the broker handling the planned sale of Magnite common shares.

What recent 10b5-1 sales in MAGNITE (MGNI) stock does the filing report?
The filing lists Rule 10b5-1 sales for Sean Buckley on 06/17/2026, 07/07/2026, 08/06/2026, and 08/17/2026, with share amounts from 8,271 to 67,179 and reported transaction values between hundreds of thousands and over a million dollars.

Is this MAGNITE (MGNI) Form 144 a sale by the company or by an individual?
The notice relates to Sean Buckley, an officer of Magnite, selling shares for his own account. It does not represent a sale of securities by Magnite, Inc. itself and does not describe primary capital raising.

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

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144: Filer Information

144: Issuer Information

144: Securities Information



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


* 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

144: Remarks and Signature

Source: View Original Filing on SEC EDGAR