MGNI insider plan: 12,500 shares via Morgan Stanley, aggregate $302K

Rhea-AI Filing Summary

Magnite, Inc. (MGNI) reported a proposed sale of 12,500 common shares to be executed through Morgan Stanley Smith Barney on 08/25/2025, with an aggregate market value of $302,000. The shares were originally acquired as restricted stock units on 06/01/2018. The filing lists total outstanding shares of 142,399,305, indicating the proposed sale represents a very small fraction of the company.

The filing also discloses recent 10b5-1 plan sales by the same person totaling 15,000 shares in the past three months, generating gross proceeds of $329,064. The filer affirms no undisclosed material adverse information and references reliance on a trading plan where applicable.

Insights

Securities Analyst

TL;DR: Insider proposes a routine small sale under a brokered plan; not material to company valuation.

The notice shows a planned sale of 12,500 shares valued at $302,000 executed through a major broker and sourced from restricted stock units granted in 2018. Given the issuer's stated outstanding share count, the transaction size is immaterial to market capitalization and unlikely to affect liquidity or investor valuation metrics. Recent 10b5-1 sales totaling 15,000 shares in the prior three months suggest systematic disposition rather than ad-hoc trading. From a market-impact perspective this filing is routine and neutral.

Corporate Governance Expert

TL;DR: Disclosure follows Rule 144 and 10b5-1 practices; governance transparency is maintained.

The form discloses the nature and source of the securities (restricted stock units) and affirms the absence of undisclosed material information, consistent with compliance expectations for insider disposals. Use of a brokered execution and documented 10b5-1 plan sales in prior months supports procedural compliance. There is no indication of accelerated insider liquidation or governance red flags in the data provided.

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	12500	302000.00	142399305	08/25/2025	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	06/01/2018	Restricted Stock Units	Issuer			12500	06/01/2018	N/A

* 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
10b5-1 Sales for PAUL CAINE 1250 Broadway 15th Floor New York NY 10001	Common	08/11/2025	5000	111427.50
10b5-1 Sales for PAUL CAINE 1250 Broadway 15th Floor New York NY 10001	Common	07/10/2025	5000	117636.50
10b5-1 Sales for PAUL CAINE 1250 Broadway 15th Floor New York NY 10001	Common	06/24/2025	5000	100000.00

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

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 shares of MGNI are proposed for sale in this Form 144?

The filing proposes sale of 12,500 common shares of Magnite, Inc.

What is the aggregate market value of the proposed MGNI sale?

The aggregate market value is listed as $302,000 for the 12,500 shares.

How were the shares being sold originally acquired?

The shares were acquired as restricted stock units on 06/01/2018 from the issuer.

Has the filer sold MGNI shares recently under a trading plan?

Yes; the filing discloses 10b5-1 sales of 5,000 shares on 06/24/2025, 5,000 shares on 07/10/2025, and 5,000 shares on 08/11/2025, with combined gross proceeds of $329,064.

What percentage of outstanding shares does the proposed sale represent?

Based on 142,399,305 outstanding shares, the 12,500-share sale represents a very small fraction of the total outstanding stock.