Magnite officer plans $336K stock sale

Available on EDGAR 09/11/2026 - 04:09 PM EDT Accepted by SEC EDGAR 09/11/2026 - 04:08 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

MAGNITE, INC. (MGNI) received a Rule 144 notice that officer Katheryn Evans plans to sell 13,997 shares of common stock, with an indicated aggregate market value of $335,928.00. The notice states that 143,424,157 shares of MAGNITE common stock were outstanding as of September 11, 2026.

Key Figures

Shares to be sold under Rule 144: 13,997 shares Aggregate market value of planned sale: $335,928.00 Shares outstanding: 143,424,157 shares +3 more

6 metrics

Shares to be sold under Rule 144 13,997 shares Planned sale of MAGNITE, INC. common stock by officer Katheryn Evans

Aggregate market value of planned sale $335,928.00 Value associated with the 13,997 shares listed in the securities information

Shares outstanding 143,424,157 shares MAGNITE, INC. common stock outstanding as of September 11, 2026

Sale on August 6, 2026 20,000 shares; $480,000.00 Common stock sold by Katheryn Evans during the past 3 months

Sale on September 8, 2026 32,285 shares; $762,870.57 Common stock sold by Katheryn Evans during the past 3 months

Sale on September 9, 2026 11,100 shares; $260,357.00 Common stock sold by Katheryn Evans during the past 3 months

Key Terms

Rule 144, restricted stock, Securities To Be Sold, aggregate market value

4 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 | 02/15/2024 | 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.

Securities To Be Sold regulatory

"144: Securities To Be Sold"

aggregate market value financial

"Common | Morgan Stanley Smith Barney LLC ... | 13997 | 335928.00"

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

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

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

The Form 144 discloses that officer Katheryn Evans has filed to sell 13,997 shares of MAGNITE, INC. common stock under Rule 144, with an indicated aggregate market value of $335,928.00 as referenced in the securities information section.

How many MAGNITE (MGNI) shares are reported as outstanding in this Form 144?

The notice reports that 143,424,157 shares of MAGNITE, INC. common stock were outstanding as of September 11, 2026, providing a share count reference in connection with the proposed Rule 144 sale.

What recent MGNI share sales by Katheryn Evans are listed in the past 3 months?

The filing lists sales of 20,000 shares for $480,000.00 on August 6, 2026, 32,285 shares for $762,870.57 on September 8, 2026, and 11,100 shares for $260,357.00 on September 9, 2026.

What type of MGNI securities are covered by this Form 144 notice?

The notice covers common stock of MAGNITE, INC., identified as restricted stock to be sold for the account of officer Katheryn Evans, with Morgan Stanley Smith Barney LLC listed in the securities information section.

On what date were the MGNI restricted shares for this Form 144 acquired?

The securities to be sold are identified as restricted stock acquired on February 15, 2024, according to the “Securities To Be Sold” section of the notice filed for Katheryn Evans.

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	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	13997	335928.00	143424157	09/11/2026	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	02/15/2024	Restricted Stock	ISSUER			13997	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	09/09/2026	11100	260357.00
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	09/11/2026
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)