MGNI insider sale notice: 21,509 shares via Morgan Stanley on NASDAQ

Rhea-AI Filing Summary

Form 144 filed for Magnite, Inc. (MGNI) shows a proposed sale of 21,509 common shares through Morgan Stanley Smith Barney with an aggregate market value of $548,952.70, to be sold approximately on 08/27/2025 on NASDAQ. The filing discloses prior restricted stock acquisitions dated 02/14/2022, 04/01/2022 and 02/14/2023 totaling 21,509 shares acquired from the issuer and paid in full on acquisition dates. The filing also lists sales by Katheryn Evans totaling 98,327 common shares during June–August 2025 with gross proceeds disclosed per trade.

Positive

• Regulatory compliance: The seller filed a Form 144 and included acquisition and sale details, meeting disclosure requirements.
• Brokered transaction: Proposed sale is routed through Morgan Stanley Smith Barney on NASDAQ, indicating orderly execution.

Negative

• Insider selling activity: The filing plus prior sales show cumulative insider disposals of 98,327 shares in June–August 2025, which may be viewed negatively by some investors.
• Ongoing sales: Additional proposed sale of 21,509 shares adds to recent insider sell volume disclosed in the filing.

Insights

Financial Analyst

TL;DR: Insider sale notice of 21,509 shares; recent selling history shows meaningful dispositions in June–August 2025.

The Form 144 documents a proposed sale of 21,509 common shares worth $548,952.70 and enumerates prior restricted stock grants that comprised the sold holdings. The filing also lists five transactions by Katheryn Evans totaling 98,327 shares sold for disclosed gross proceeds across June through August 2025. From a liquidity perspective, the planned sale and the recent disposals are executed through an institutional broker on NASDAQ and are explicitly reported, ensuring regulatory compliance and market transparency.

Corporate Governance Expert

TL;DR: Repeated insider dispositions raise governance and signaling questions despite being formally reported.

The disclosure shows multiple sales by an identified insider and a new Form 144 notice for additional shares. While the filing itself is procedural and satisfies Rule 144 notice requirements, consecutive sales by the same person over a short period can be notable to stakeholders. The document contains required representations that no undisclosed material adverse information is known by the seller, and the presence of restricted stock acquisition details confirms the shares originated from issuer grants rather than open-market purchases.

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

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	21509	548952.70	142399305	08/27/2025	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	02/14/2022	Restricted Stock	Issuer			5805	02/14/2022	Not Applicable
Common	02/14/2023	Restricted Stock	Issuer			5704	02/14/2023	Not Applicable
Common	04/01/2022	Restricted Stock	Issuer			10000	04/01/2022	Not Applicable

* 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
KATHERYN EVANS 1250 Broadway, 15th Floor New York NY 10001	Common	08/25/2025	8345	216970.00
KATHERYN EVANS 1250 Broadway, 15th Floor New York NY 10001	Common	08/18/2025	10487	250149.56
KATHERYN EVANS 1250 Broadway, 15th Floor New York NY 10001	Common	06/30/2025	24495	571164.00
KATHERYN EVANS 1250 Broadway, 15th Floor New York NY 10001	Common	06/16/2025	20000	370000.00
KATHERYN EVANS 1250 Broadway, 15th Floor New York NY 10001	Common	06/05/2025	35000	607695.50

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 21,509 common shares valued at $548,952.70, to be sold on or about 08/27/2025 on NASDAQ.

Who conducted recent sales of MGNI shares listed in the filing?

The filing lists sales by Katheryn Evans with addresses provided, showing five transactions totaling 98,327 shares between 06/05/2025 and 08/25/2025.

Were the shares being sold originally granted or purchased?

The securities to be sold were acquired as Restricted Stock from the issuer on 02/14/2022, 04/01/2022, and 02/14/2023 and were paid in full on those dates.

Through which broker will the proposed sale be executed?

The proposed sale is to be executed through Morgan Stanley Smith Barney LLC, Executive Financial Services on NASDAQ.

Does the filing state any undisclosed material adverse information?

By signature, the person for whose account the securities are to be sold represents they do not know any material adverse information regarding the issuer that has not been publicly disclosed.