Magnite officer plans $1.4M stock sale

An officer of Magnite, Inc. filed a Rule 144 notice to potentially sell 60,000 MGNI common shares valued at about $1.41 million.

Rhea-AI Filing Summary

MAGNITE, INC. (MGNI) received a Rule 144 notice from officer Aaron Saltz covering a proposed sale of 60,000 shares of common stock through Morgan Stanley Smith Barney LLC Executive Financial Services. The shares have an indicated aggregate market value of $1,414,800.00 and are listed for sale on NASDAQ around September 10, 2026.

The 60,000 shares consist of 22,257 shares acquired from previously exercised stock options on September 8, 2021 and 37,743 shares acquired from restricted stock units on April 1, 2021. As context, common shares outstanding were 143,424,157, a baseline figure, not the amount being offered.

Key Figures

Shares to be sold: 60,000 shares Aggregate market value: $1,414,800.00 Shares outstanding: 143,424,157 shares +3 more

6 metrics

Shares to be sold 60,000 shares Common stock covered by the Rule 144 notice

Aggregate market value $1,414,800.00 Estimated value of 60,000 shares proposed for sale

Shares outstanding 143,424,157 shares Common shares outstanding as context in the notice

Shares from stock options 22,257 shares Common shares acquired from previously exercised stock options on September 8, 2021

Shares from RSUs 37,743 shares Common shares acquired from restricted stock units on April 1, 2021

Notice date September 10, 2026 Date of Rule 144 notice signed by Aaron Saltz

Key Terms

Rule 144, restricted stock units, Previously Exercised Stock Options, vesting

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 units financial

"Restricted Stock Units | Issuer | | | 37743 | 04/01/2021 | N/A"

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.

Previously Exercised Stock Options financial

"Previously Exercised Stock Options | Issuer | | | 22257"

vesting financial

"acquired upon the vesting of restricted stock units during the period"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

FAQ

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

What did MAGNITE, INC. (MGNI) disclose in this Form 144 filing?

MAGNITE, INC. disclosed that officer Aaron Saltz filed a Rule 144 notice for a potential sale of 60,000 shares of the company’s common stock through Morgan Stanley Smith Barney LLC Executive Financial Services.

How many MGNI shares are covered by Aaron Saltz’s planned Rule 144 sale?

The notice covers a proposed sale of 60,000 shares of MAGNITE, INC. common stock, with an indicated aggregate market value of $1,414,800.00 as reflected in the filing.

What is the source of the MGNI shares to be sold under this Form 144?

The 60,000 MAGNITE, INC. shares come from 22,257 shares acquired via previously exercised stock options on September 8, 2021 and 37,743 shares acquired via restricted stock units on April 1, 2021.

When are the MGNI shares expected to be sold according to the Rule 144 notice?

The filing lists an approximate sale date of September 10, 2026 for the proposed sale of MAGNITE, INC. common shares under Rule 144.

How many MAGNITE, INC. shares were outstanding as context in this Form 144?

The Form 144 states that 143,424,157 shares of MAGNITE, INC. common stock were outstanding; this is a contextual baseline figure and not the amount covered by the Rule 144 sale.

What additional detail is given about how the MGNI shares were or will be acquired?

The remarks explain that the securities to be sold were or will be acquired upon the vesting of restricted stock units during the period from April 1, 2021 through August 15, 2025.

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

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Available on EDGAR 09/10/2026 - 04:36 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	0001807986
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	AARON SALTZ
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	60000	1414800.00	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	09/08/2021	Previously Exercised Stock Options	Issuer			22257	09/08/2021	Cash
Common	04/01/2021	Restricted Stock Units	Issuer			37743	04/01/2021	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

Nothing to Report

144: Remarks and Signature

Remarks	The securities to be sold were or will be acquired upon the vesting of restricted stock units during the period of 04/01/2021 through 08/15/2025.
Date of Notice	09/10/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/11/2026
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/ Aaron Saltz
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)