MGNI Rule 144 Notice — 6,265 Shares Proposed Sale; Recent Sales $1.26M

Rhea-AI Filing Summary

Form 144 notice for Magnite, Inc. (MGNI) reporting a proposed sale of 6,265 common shares with an aggregate market value of $148,480.50, scheduled approximately for 08/18/2025. The shares were acquired as restricted stock units on 08/15/2025 and paid via equity compensation. The filer also disclosed four sales in the past three months totaling 63,552 shares for gross proceeds of $1,260,065.06 (sales on 06/04/2025, 06/16/2025, 06/30/2025 and 08/14/2025). The notice includes the standard signer representation that no undisclosed material adverse information is known by the seller.

Insights

Securities Analyst

TL;DR: Insider proposes to sell 6,265 RSU shares and has sold 63,552 shares recently, totaling $1.26M in proceeds.

This Form 144 shows a scheduled Rule 144 sale of newly vested restricted stock units (acquired 08/15/2025) and documents recent insider liquidations aggregating 63,552 shares for $1,260,065.06. The filing is procedural and complies with Rule 144 disclosure requirements; it does not include commentary on company results or material nonpublic information. For investors, the filing confirms insider selling activity and the timing of a proposed sale, but contains no financial performance metrics or new corporate events.

Corporate Governance Expert

TL;DR: Routine Rule 144 disclosure of vested RSUs being sold and prior insider sales; no governance exceptions noted.

The notice identifies the nature of acquisition as equity compensation and shows multiple dispositions in the past three months. From a governance perspective, the document satisfies the disclosure mechanics required when insiders sell under Rule 144 and includes the statutory representation about material nonpublic information. The filing does not indicate adoption of a 10b5-1 plan or other trading plan within the notice text.

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	6265	148480.50	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			6265	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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Aaron Saltz c/o Magnite, Inc. 1250 Broadway, 15th Floor New York NY 10001	Common	08/14/2025	13860	323519.68
Aaron Saltz c/o Magnite, Inc. 1250 Broadway, 15th Floor New York NY 10001	Common	06/30/2025	17574	386628.00
Aaron Saltz c/o Magnite, Inc. 1250 Broadway, 15th Floor New York NY 10001	Common	06/16/2025	16788	293790.00
Aaron Saltz c/o Magnite, Inc. 1250 Broadway, 15th Floor New York NY 10001	Common	06/04/2025	15330	256127.38

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 does the Form 144 for Magnite (MGNI) disclose?

The Form 144 discloses a proposed sale of 6,265 common shares (market value $148,480.50) and four prior sales totaling 63,552 shares for $1,260,065.06.

When were the shares to be sold acquired according to the filing?

The shares to be sold were acquired on 08/15/2025 as restricted stock units and payment is listed as equity compensation.

What were the dates and total proceeds of recent sales by the filer?

Recent sales occurred on 06/04/2025, 06/16/2025, 06/30/2025, and 08/14/2025, totaling 63,552 shares and gross proceeds of $1,260,065.06.

Does the filing state the filer knows of any undisclosed material information?

Yes. By signing, the person represents they do not know any material adverse information about the issuer that has not been publicly disclosed.

Does the Form 144 indicate the seller adopted a 10b5-1 trading plan?

The filing text does not indicate that a 10b5-1 trading plan was adopted or provide a plan adoption date.

Which broker is named for the proposed sale?

The broker named is Morgan Stanley Smith Barney LLC Executive Financial Services, 1 New York Plaza 8th Floor New York NY 10004.