[144] Magnite, Inc. SEC Filing

Rhea-AI Filing Summary

Insider sale notice for Magnite, Inc. (MGNI). The filing shows a proposed sale of 20,000 common shares through Morgan Stanley Smith Barney with an aggregate market value of $511,214, scheduled approximately on 09/08/2025 on NASDAQ. The filer reports acquiring 14,853 shares on 02/15/2025 and 5,147 shares on 08/15/2025 via restricted stock vesting as compensation. During the past three months the same person sold 10,886 shares on 08/18/2025 for $259,667.02 and 9,315 shares on 08/19/2025 for $218,152.18. The signer certifies they are not aware of any undisclosed material adverse information about the issuer.

Positive

• Full Rule 144 disclosure provided including broker, share counts, acquisition dates, and past three months' sales, supporting regulatory transparency
• Shares acquired via restricted stock vesting indicate these sales derive from compensation-related grants rather than undisclosed transfers

Negative

• Insider has made multiple recent dispositions (10,886 and 9,315 shares in August plus the proposed 20,000), which may attract investor attention
• Filing does not cite a trading plan adoption date or 10b5-1 instruction, so timing may be interpreted as ad hoc rather than pre-planned

Insights

Financial Analyst

TL;DR: Routine insider sale disclosure; transaction size is small relative to company equity and follows recent disposals.

The filing documents a planned sale of 20,000 shares valued at $511,214 via a broker on NASDAQ and notes two recent sales in August totaling 20,201 shares for roughly $477,819. Acquisition records show the shares being sold were granted as restricted stock vesting in February and August 2025 and were paid as compensation. From an investor perspective this is a standard Rule 144 notice that provides transparency about insider liquidity but, by itself, offers no disclosure of material nonpublic information.

Corporate Governance Expert

TL;DR: Proper Rule 144 notice filed, indicating compliance with insider-sale reporting requirements.

The form identifies the broker, number of shares, estimated market value, and acquisition details, and includes the required representation regarding material nonpublic information. The filing does not state any trading plan adoption date or 10b5-1 instruction. This is a compliance-focused disclosure and does not report any governance actions or executive changes.

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
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

Relationship to Issuer

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	20000	511214.00	142399305	09/08/2025	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	02/15/2025	Restricted stock vesting under a registered plan	Issuer			14853	02/15/2025	Compensation
Common	08/15/2025	Restricted stock vesting under a registered plan	Issuer			5147	08/15/2025	Compensation

* 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
SEAN P BUCKLEY 1250 Broadway, 15th Floor New York NY 10001	Common	08/19/2025	9315	218152.18
SEAN P BUCKLEY 1250 Broadway, 15th Floor New York NY 10001	Common	08/18/2025	10886	259667.02

144: Remarks and Signature

Remarks

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the Form 144 for Magnite (MGNI) report?

The Form 144 reports a proposed sale of 20,000 common shares valued at $511,214 to be executed on NASDAQ through Morgan Stanley Smith Barney, with acquisition details and recent sales disclosed.

Who is the seller named in the filing?

The filing identifies the seller as Sean P Buckley, with prior August sales and the current proposed sale listed on the notice.

When were the shares being sold originally acquired?

14,853 shares were acquired on 02/15/2025 and 5,147 shares were acquired on 08/15/2025, both noted as restricted stock vesting under a registered plan.

What sales by this person occurred in the past three months?

Two sales: 10,886 shares on 08/18/2025 for $259,667.02 and 9,315 shares on 08/19/2025 for $218,152.18.

On what exchange will the proposed sale occur?

The proposed sale is scheduled on NASDAQ.

Does the filer state possession of any material nonpublic information?

The signer represents they do not know of any material adverse information about the issuer that has not been publicly disclosed.