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  4. [144] MAGNITE, INC. SEC Filing

Magnite (NASDAQ: MGNI) holder Sean Buckley logs option, RSU share sales

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

Rhea-AI Filing Summary

Sean Buckley, a shareholder of MGNI, filed a notice to potentially sell common stock through Morgan Stanley Smith Barney LLC. The planned sales include 28,703 shares to be issued upon the exercise of stock options dated 08/06/2026 and 38,476 shares from RSU & PSA awards dated 11/15/2023. The filing also reports prior Rule 10b5-1 plan sales of 19,233 shares of common stock on both 06/17/2026 and 07/07/2026, for proceeds of $365,427.00 and $404,553.78, respectively.

Positive

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Negative

  • None.
Option-related shares 28,703 shares Common stock issuable upon exercise of stock options dated 08/06/2026
RSU & PSA shares 38,476 shares Common stock tied to RSU & PSA awards dated 11/15/2023
10b5-1 sale shares 19,233 shares Each of two Rule 10b5-1 sales of common stock in June and July 2026
Proceeds 07/07/2026 sale $404,553.78 Value of 19,233 common shares sold on 07/07/2026 under Rule 10b5-1
Proceeds 06/17/2026 sale $365,427.00 Value of 19,233 common shares sold on 06/17/2026 under Rule 10b5-1
Form 144 regulatory
"Filer Information | | | 144: Filer Information"
Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.
Rule 10b5-1 regulatory
"10b5-1 Sales for SEAN BUCKLEY 1250 Broadway, 9th Floor"
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.
RSU financial
"Common | 11/15/2023 | RSU & PSA | Issuer |"
Restricted stock units (RSUs) are a form of company shares given to employees as part of their compensation, usually with certain restrictions or conditions, such as remaining with the company for a set period. When these restrictions lift, employees receive actual shares that they can sell or hold. For investors, RSUs can impact a company's stock supply and reflect the company's commitment to attracting and retaining talent.
PSA financial
"Common | 11/15/2023 | RSU & PSA | Issuer |"
Prostate-specific antigen (PSA) is a protein produced by prostate tissue and measured in blood to help detect and monitor prostate conditions, including prostate cancer and benign enlargement. For investors, changes in PSA levels reported in clinical studies or regulatory filings can signal how well a drug or diagnostic test is working, similar to how a gauge on a dashboard indicates the health of a machine and can affect a company’s valuation and regulatory outlook.

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

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FAQ

What does the MGNI Form 144 filing by Sean Buckley disclose?
The filing discloses that Sean Buckley may sell MGNI common stock, including shares from stock option exercises and RSU & PSA awards, and lists prior Rule 10b5-1 sales over the past three months.

How many MGNI shares are tied to Sean Buckley’s option exercise?
The notice covers a potential sale of 28,703 shares of MGNI common stock issuable upon the exercise of stock options dated 08/06/2026, to be sold for cash through Morgan Stanley Smith Barney LLC.

How many MGNI shares come from RSU and PSA awards in this filing?
The filing includes 38,476 shares of MGNI common stock associated with RSU & PSA awards dated 11/15/2023, which are listed as securities that may be sold by the issuer’s shareholder.

What prior 10b5-1 sales of MGNI stock did Sean Buckley report?
Sean Buckley reported two Rule 10b5-1 plan sales of MGNI common stock: 19,233 shares on 06/17/2026 for $365,427.00 and 19,233 shares on 07/07/2026 for $404,553.78.

Which broker is used for the MGNI stock sales in this Form 144?
The planned MGNI stock sales are to be executed through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004.

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