[144] Magnite, Inc. SEC Filing

Rhea-AI Filing Summary

Magnite, Inc. (MGNI) Form 144: This notice reports a proposed sale of 8,510 shares of common stock held as restricted stock units acquired on 08/15/2025. The shares are to be sold through Morgan Stanley Smith Barney LLC on 08/18/2025 on NASDAQ with an aggregate market value of $201,687.00. The filing shows 142,399,305 shares outstanding for the class.

The filer discloses three prior sales by the same person during the past three months: 9,289 shares on 06/30/2025 (gross proceeds $204,358.00), 8,742 shares on 05/27/2025 (gross proceeds $139,872.00), and 3,653 shares on 05/23/2025 (gross proceeds $54,904.59). The acquisition was via equity compensation (restricted stock unit) and payment was recorded on 08/15/2025.

Insights

Securities Compliance Analyst

TL;DR: Routine insider sale notice showing RSU-derived shares to be sold via broker; prior sales in recent months are disclosed.

The Form 144 is procedural and meets Rule 144 notice requirements by identifying the broker, number of shares, acquisition source (restricted stock unit), intended sale date, and aggregate value. The filing also transparently lists three recent dispositions by the same individual with gross proceeds, which is important for aggregation and compliance with resale rules. There is no indication in this notice of undisclosed material information about the issuer.

Equity Research Analyst

TL;DR: Small insider liquidity actions disclosed; transaction size is minor relative to total shares outstanding.

The proposed sale of 8,510 shares for $201,687 and recent aggregate dispositions (~21,684 shares across three transactions) are factual and allow investors to track insider selling. Given the reported shares outstanding (142,399,305), these amounts represent a very small portion of the float and appear unlikely to materially affect company valuation by themselves. The origin of the shares as RSUs and the use of a major broker are standard for executive compensation realizations.

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	8510	201687.00	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			8510	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
David Buonasera c/o Magnite, Inc. 1250 Broadway, 15th Floor New York NY 10001	Common	06/30/2025	9289	204358.00
David Buonasera c/o Magnite, Inc. 1250 Broadway, 15th Floor New York NY 10001	Common	05/27/2025	8742	139872.00
David Buonasera c/o Magnite, Inc. 1250 Broadway, 15th Floor New York NY 10001	Common	05/23/2025	3653	54904.59

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)