Magnite (MGNI) Form 144 Notice — 3,217 RSU Shares Planned Sale

Rhea-AI Filing Summary

Magnite, Inc. (MGNI) filed a Form 144 reporting a proposed sale of common stock tied to recent equity compensation. The notice reports 3,217 shares acquired as Restricted Stock Units on 08/15/2025, with an aggregate market value of $76,242.90. The proposed sale is to be handled by Morgan Stanley Smith Barney on the NASDAQ, with an approximate sale date of 08/18/2025. The filing states there were 142,399,305 shares outstanding, and no other sales by the reporting person in the past three months were reported. The filer certifies no undisclosed material adverse information is known.

Positive

• Disclosure complies with Rule 144 providing broker, acquisition, and planned sale details
• Transaction size is modest (3,217 shares, $76,242.90) relative to 142,399,305 shares outstanding
• No sales in the past three months were reported for the selling person

Negative

• None.

Insights

Financial Analyst

Routine insider sale notice for equity compensation; size is small relative to the company's outstanding shares.

The Form 144 documents a proposed sale of 3,217 shares acquired via Restricted Stock Units and scheduled for sale within days of grant. The transaction appears procedural—disposition of equity compensation through a broker—and the aggregate value (~$76k) is modest versus the reported 142.4 million shares outstanding. For most investors this is unlikely to be materially value-changing, but it does increase available shares temporarily if executed.

Corporate Governance Expert

Disclosure complies with Rule 144 notice requirements; filer makes required representations.

The filing provides the broker, acquisition date, nature of acquisition (Restricted Stock Unit), and planned sale date, meeting the procedural elements of Rule 144 notice. The signature/remarks section includes the standard representation about no undisclosed material adverse information and warns against false statements. There are no reported sales in the prior three months, which simplifies aggregation rules for this notice.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	3217	76242.90	142399305	08/18/2025	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 Unit- See Remarks	Issuer			3217	08/15/2025	Equity Compensation

* 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

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What transaction does the MGNI Form 144 report?

The filing reports a proposed sale of 3,217 common shares acquired as Restricted Stock Units.

When were the shares acquired and when is the approximate sale date?

The shares were acquired on 08/15/2025 and the approximate sale date is 08/18/2025.

What is the aggregate market value and who is the broker handling the sale?

Aggregate market value is $76,242.90 and the broker is Morgan Stanley Smith Barney LLC, New York.

How many shares outstanding does the filing report for MGNI?

The filing lists 142,399,305 shares outstanding.

Did the filer report any securities sold in the past three months?

The filing states Nothing to Report for securities sold during the past three months.