Magnite officer may sell $260K in Rule 144 stock

Magnite officer Katheryn Evans filed a Rule 144 notice to resell 11,100 MGNI shares, with prior insider sales also disclosed for the past three months.

Rhea-AI Filing Summary

MAGNITE, INC. (MGNI) officer Katheryn Evans has filed a notice of proposed resale of company stock under Rule 144. The filing covers the potential sale of 11,100 shares of common stock with an aggregate market value of $260,357.00, based on a reported 143,424,157 shares outstanding as of September 9, 2026.

The shares proposed for sale consist of restricted stock awards granted on April 1, 2022 (10,000 shares) and February 15, 2024 (1,100 shares). Morgan Stanley Smith Barney LLC Executive Financial Services is listed as the broker. The notice also lists prior sales by Evans in the past three months.

Key Figures

Shares to be sold under Rule 144: 11,100 shares Aggregate market value of proposed sale: $260,357.00 Shares outstanding: 143,424,157 shares +4 more

7 metrics

Shares to be sold under Rule 144 11,100 shares Proposed Magnite common stock sale reported for September 9, 2026

Aggregate market value of proposed sale $260,357.00 Value of 11,100 Magnite shares covered by the notice

Shares outstanding 143,424,157 shares Magnite common stock outstanding as of September 9, 2026

Shares sold on September 8, 2026 32,285 shares Prior sale of Magnite common stock by Katheryn Evans

Proceeds from September 8, 2026 sale $762,870.57 Value of 32,285 Magnite shares sold

Shares sold on August 6, 2026 20,000 shares Earlier sale of Magnite common stock by Katheryn Evans

Proceeds from August 6, 2026 sale $480,000.00 Value of 20,000 Magnite shares sold

Key Terms

Rule 144, restricted stock, aggregate market value

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

restricted stock financial

"Common | 04/01/2022 | Restricted Stock | Issuer"

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

"Common | Morgan Stanley ... | 11100 | 260357.00"

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.

FAQ

What does the Form 144 filing for MGNI disclose about planned stock sales?

It discloses that officer Katheryn Evans may sell 11,100 shares of Magnite common stock under Rule 144, representing restricted stock grants from April 1, 2022 and February 15, 2024, with an aggregate market value of $260,357.00 at the time cited.

How many MAGNITE, INC. (MGNI) shares are registered as outstanding in this notice?

The notice reports 143,424,157 shares of Magnite common stock as outstanding as of September 9, 2026; this figure is provided as a baseline for applying Rule 144 volume limitations, not as the amount being sold.

What prior MAGNITE, INC. (MGNI) stock sales by Katheryn Evans are disclosed?

The notice lists sales of 32,285 shares of common stock on September 8, 2026 for proceeds of $762,870.57, and 20,000 shares on August 6, 2026 for proceeds of $480,000.00.

What type of MAGNITE, INC. (MGNI) securities are covered by this Form 144?

The Form 144 relates to common stock of Magnite, specifically restricted stock originally acquired from the issuer on April 1, 2022 and February 15, 2024, now proposed to be sold under the Rule 144 safe harbor.

Which broker is handling the planned MAGNITE, INC. (MGNI) Rule 144 sale?

The broker listed is Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004, in connection with the proposed sale of 11,100 Magnite common shares.

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

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Available on EDGAR 09/09/2026 - 04:53 PM Accepted by SEC EDGAR 09/09/2026 - 04:53 PM Learn about SEC filing dates

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	0001700262
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	KATHERYN EVANS
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	11100	260357.00	143424157	09/09/2026	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	04/01/2022	Restricted Stock	Issuer			10000	04/01/2022	Not Applicable
Common	02/15/2024	Restricted Stock	Issuer			1100	02/15/2024	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, 9th Floor New York, NY 10001	Common	09/08/2026	32285	762870.57
KATHERYN EVANS 1250 Broadway, 9th Floor New York, NY 10001	Common	08/06/2026	20000	480000.00

144: Remarks and Signature

Remarks
Date of Notice	09/09/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/08/2026
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/ Katheryn Evans
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)