Magnite (MGNI) Form 144: Insider Reports 39,054-Share Sale; Recent Sales Listed

Rhea-AI Filing Summary

Form 144 notice for Magnite, Inc. (MGNI) reports a proposed sale of 39,054 common shares with an aggregate market value of $925,579.80, to be effected approximately on 08/18/2025 on NASDAQ through Morgan Stanley Smith Barney LLC Executive Financial Services.

The filing states the shares were acquired on 08/15/2025 as Restricted Stock Units and paid as equity compensation. The document also lists four prior sales by Michael Barrett during the past three months totaling 446,900 shares for gross proceeds of $8,350,722.60. The signer represents no undisclosed material adverse information.

Insights

Securities Analyst

TL;DR: Routine insider sale filing showing a small planned disposition and several recent sales, not clearly material to market capitalization.

The notice documents a proposed sale of 39,054 shares valued at $925,579.80 and discloses acquisition as Restricted Stock Units on 08/15/2025. The filing lists four recent transactions by Michael Barrett totaling 446,900 shares and $8,350,722.60 in gross proceeds in the prior three months. Given the issuer's outstanding share count of 142,399,305, these transactions represent a small fraction of outstanding equity and appear to be executions of compensation-related and discretionary sales rather than a corporate or market-moving event. The filing meets Rule 144 disclosure elements and names the executing broker.

Compliance / Risk Analyst

TL;DR: Filing appears procedurally complete and includes required attestations; no regulatory concerns evident from disclosed details.

The Form 144 includes required information about the securities to be sold, acquisition history, nature of acquisition (Restricted Stock Units), broker details (Morgan Stanley Smith Barney LLC), and a attestation regarding undisclosed material adverse information. Dates and amounts for recent sales are provided, supporting traceability. There is no indication in the filing of Rule 10b5-1 plan adoption or other special trading instructions in the remarks. From a compliance standpoint, the notice contains the standard representations and transaction history needed to satisfy Rule 144 reporting obligations.

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	39054	925579.80	142399305	08/18/2025	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	08/15/2025	Restricted Stock Unit- See Remarks	Issuer			39054	08/15/2025	Equity 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
Michael Barrett c/o Magnite, Inc. 1250 Broadway, 15th Floor New York NY 10001	Common	07/15/2025	70900	1650161.60
Michael Barrett c/o Magnite, Inc. 1250 Broadway, 15th Floor New York NY 10001	Common	06/24/2025	300000	6000000.00
Michael Barrett c/o Magnite, Inc. 1250 Broadway, 15th Floor New York NY 10001	Common	06/18/2025	30000	570000.00
Michael Barrett c/o Magnite, Inc. 1250 Broadway, 15th Floor New York NY 10001	Common	06/16/2025	45000	799000.00

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 filed for MGNI disclose about the planned sale?

The form discloses a proposed sale of 39,054 common shares valued at $925,579.80, to occur approximately on 08/18/2025 on NASDAQ through Morgan Stanley Smith Barney LLC.

How were the 39,054 shares acquired according to the filing?

The shares were acquired on 08/15/2025 as Restricted Stock Units and the payment is listed as equity compensation.

Does the filing show recent sales by the same person?

Yes. The filing lists four sales by Michael Barrett on 07/15/2025, 06/24/2025, 06/18/2025, and 06/16/2025 totaling 446,900 shares for gross proceeds of $8,350,722.60.

What is the issuer's outstanding share count reported in the filing?

The filing reports 142,399,305 shares outstanding for the issuer.

Does the Form 144 include any attestation about material nonpublic information?

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