Magnite officer proposes $106K share sale

The three-month sale history includes 12,479 common shares sold on August 10, 2026, for gross proceeds of $308,024.15.

Available on EDGAR 11/09/2026 - 04:05 PM EST Accepted by SEC EDGAR 11/09/2026 - 04:04 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Magnite, Inc. (MGNI) officer Brian Lee Gephart gave notice of a proposed sale of 3,700 common shares, with an aggregate market value of $106,486 and an approximate sale date of November 9, 2026. The shares were acquired from the issuer as restricted stock on August 15, 2025; Morgan Stanley Smith Barney LLC is listed as the broker.

Key Figures

Proposed sale: 3,700 common shares Aggregate market value: $106,486 Prior sale: 12,479 common shares +2 more

5 metrics

Proposed sale 3,700 common shares Approximate sale date November 9, 2026

Aggregate market value $106,486 Proposed sale

Prior sale 12,479 common shares Sold August 10, 2026; listed among securities sold during the past three months

Gross proceeds $308,024.15 Prior sale on August 10, 2026

Common shares outstanding 143,559,468 shares Outstanding share count stated in the notice

Key Terms

Restricted Stock, Aggregate Market Value, Gross Proceeds

3 terms

Restricted Stock financial

"Nature of Acquisition Transaction: Restricted Stock"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

Aggregate Market Value financial

"Aggregate Market Value"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

Gross Proceeds financial

"Amount of Securities Sold | Gross Proceeds"

The total amount of cash a company receives from a financing event or sale before any fees, expenses, taxes or deductions are taken out. Investors watch gross proceeds because it shows the raw scale of new capital being raised—think of it as the paycheck amount before withholdings—which helps assess how much funding is available for operations, growth, debt payoff or how much shareholder dilution might occur once costs are removed.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many MGNI shares did Brian Gephart propose to sell?

Brian Gephart gave notice of a proposed sale of 3,700 common shares, with an aggregate market value of $106,486 and an approximate sale date of November 9, 2026. Morgan Stanley Smith Barney LLC is listed as the broker.

How many MGNI shares had Brian Gephart sold in the previous three months?

The listed prior sale was 12,479 common shares on August 10, 2026, for gross proceeds of $308,024.15.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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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	0001778484
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	MAGNITE, INC.
SEC File Number	001-36384
Address of Issuer	1250 Broadway, 9th Floor New York, NEW YORK 10001
Phone	(212) 243-2769
Name of Person for Whose Account the Securities are To Be Sold	BRIAN GEPHART
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	Officer

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	3700	106486.00	143559468	11/09/2026	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	Issuer			3700	08/15/2025	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
BRIAN GEPHART 1250 Broadway, 9th Floor New York, NY 10001	Common	08/10/2026	12479	308024.15

144: Remarks and Signature

Remarks
Date of Notice	11/09/2026
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	/s/ Brian Lee Gephart
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)