Magnite director plans $236K stock sale under Rule 144

Director Paul Caine files a Rule 144 notice to sell up to 10,000 shares of Magnite common stock, with prior 10b5-1 sales also disclosed.

Rhea-AI Filing Summary

MAGNITE, INC. (MGNI) is the issuer for a planned sale of common stock by director Paul Caine under Rule 144. The notice covers up to 10,000 shares of common stock, with an aggregate market value of $235,800.00, to be sold through Morgan Stanley Smith Barney LLC on NASDAQ.

The shares relate to Restricted Stock Units originally dated June 1, 2017 and issued by Magnite. The filing also lists prior Rule 10b5-1 sales by Paul Caine over the past three months, each involving Magnite common stock.

Key Figures

Planned shares to be sold: 10,000 shares Aggregate market value of planned sale: $235,800.00 Security type: Common stock +4 more

7 metrics

Planned shares to be sold 10,000 shares Common stock covered by Paul Caine’s Rule 144 notice

Aggregate market value of planned sale $235,800.00 Value of 10,000 MAGNITE, INC. common shares listed in the notice

Security type Common stock Class of securities to be sold under Rule 144

Underlying award date June 1, 2017 Date of Restricted Stock Units related to the shares to be sold

10b5-1 sale on August 14, 2026 7,500 shares for $187,500.00 Past three months’ Rule 10b5-1 sale of MAGNITE common stock

10b5-1 sale on August 10, 2026 5,000 shares for $121,740.00 Past three months’ Rule 10b5-1 sale of MAGNITE common stock

10b5-1 sale on July 10, 2026 5,000 shares for $103,185.00 Past three months’ Rule 10b5-1 sale of MAGNITE common stock

Key Terms

Rule 144, Restricted Stock Units, 10b5-1

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 Units financial

"Common | 06/01/2017 | Restricted Stock Units | Issuer"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

10b5-1 regulatory

"10b5-1 Sales for PAUL CAINE 1250 Broadway, 9th Floor New York NY 10001"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

FAQ

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

What does the Form 144 filing disclose for MAGNITE, INC. (MGNI)?

It discloses that director Paul Caine has filed a Rule 144 notice to sell up to 10,000 shares of Magnite common stock, with an indicated aggregate market value of $235,800.00, to be sold through Morgan Stanley Smith Barney LLC on NASDAQ.

How many MAGNITE (MGNI) shares are covered by Paul Caine’s planned Rule 144 sale?

The planned sale covers up to 10,000 shares of MAGNITE, INC. common stock, with an indicated aggregate market value of $235,800.00 as stated in the securities information section.

What is the origin of the MAGNITE (MGNI) shares Paul Caine plans to sell?

The shares are tied to Restricted Stock Units dated June 1, 2017, identified as having been issued by MAGNITE, INC. under the securities-to-be-sold section of the notice.

Which broker is handling Paul Caine’s planned MAGNITE (MGNI) share sale?

The planned sale is listed through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, with the shares to be sold on NASDAQ according to the filing.

What prior 10b5-1 sales of MAGNITE (MGNI) shares by Paul Caine are disclosed?

The filing lists prior Rule 10b5-1 sales of MAGNITE, INC. common stock by Paul Caine: 7,500 shares for $187,500.00 on August 14, 2026; 5,000 shares for $121,740.00 on August 10, 2026; and 5,000 shares for $103,185.00 on July 10, 2026.

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

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Available on EDGAR 09/10/2026 - 04:37 PM Accepted by SEC EDGAR 09/10/2026 - 04:36 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	0001411765
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	2122432769
Name of Person for Whose Account the Securities are To Be Sold	PAUL CAINE
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	Director

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	10000	235800.00	143424157	09/10/2026	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	06/01/2017	Restricted Stock Units	Issuer			10000	06/01/2017	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, 9th Floor New York NY 10001	Common	08/14/2026	7500	187500.00
10b5-1 Sales for PAUL CAINE 1250 Broadway, 9th Floor New York NY 10001	Common	08/10/2026	5000	121740.00
10b5-1 Sales for PAUL CAINE 1250 Broadway, 9th Floor New York NY 10001	Common	07/10/2026	5000	103185.00

144: Remarks and Signature

Remarks
Date of Notice	09/10/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	08/20/2025
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/ Paul Caine
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)