Magnite (MGNI) Rule 144 Notice — 13,860 Shares Planned Sale

Rhea-AI Filing Summary

Form 144 notice for Magnite, Inc. (MGNI): An affiliate intends to sell 13,860 common shares with an aggregate market value of $323,518.47. The shares represent a small fraction of the issuer's outstanding common stock of 142,399,305 shares and are expected to be sold on or about 08/14/2025 on NASDAQ. The filing identifies Morgan Stanley Smith Barney LLC as the broker through which the sale is to occur.

The specific shares to be sold were acquired through restricted stock awards on 11/15/2023, 02/15/2024, and 05/15/2024, and via the employee stock purchase plan on 08/27/2018 and 08/28/2017. The filer, Aaron Saltz, reported multiple prior dispositions in June 2025 totaling 49,692 shares generating gross proceeds of roughly $1.04 million across several sales.

Insights

Securities Analyst

TL;DR: Routine Rule 144 sale by an affiliate; size is immaterial relative to shares outstanding and appears consistent with prior June dispositions.

The filing shows an affiliate intends to sell 13,860 shares valued at $323,518.47 via Morgan Stanley Smith Barney on NASDAQ around 08/14/2025. Acquisition dates and quantities reconcile to the shares offered, indicating these are vested/restricted and ESPP-origin shares rather than newly transferred third-party purchases. Prior sales in June 2025 total 49,692 shares, suggesting ongoing liquidity activity by the same person. From a market-impact perspective, 13,860 shares is approximately 0.0097% of the 142.4 million shares outstanding, which is small and unlikely to move the stock materially.

Corporate Governance Expert

TL;DR: Disclosure is complete for a Rule 144 notice; the signer affirms no undisclosed material nonpublic information.

The form contains acquisition details for each lot and indicates the nature of payment where applicable, meeting standard Rule 144 disclosure expectations. The signature block includes the required representation that the seller is not aware of material adverse undisclosed information. Multiple clustered sales by the same individual in a short period merit attention from governance perspective but do not by themselves indicate policy breach given the affirmation provided.

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	13860	323518.47	142399305	08/14/2025	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	11/15/2023	Restricted Stock	Issuer			1233	11/15/2023	Not Applicable
Common	02/15/2024	Restricted Stock	Issuer			1610	02/15/2024	Not Applicable
Common	05/15/2024	Restricted Stock	Issuer			1074	05/15/2024	Not Applicable
Common	08/27/2018	Employee Stock Purchase Plan	Issuer			5358	08/27/2018	Cash
Common	08/28/2017	Employee Stock Purchase Plan	Issuer			4585	08/28/2017	Cash

* 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 1250 Broadway, 15th Floor New York NY 10001	Common	06/30/2025	17574	386628.00
AARON SALTZ 1250 Broadway, 15th Floor New York NY 10001	Common	06/16/2025	16788	293790.00
AARON SALTZ 1250 Broadway, 15th Floor New York NY 10001	Common	06/04/2025	9447	157798.91
AARON SALTZ 1250 Broadway, 15th Floor New York NY 10001	Common	06/04/2025	825	13789.05
AARON SALTZ 1250 Broadway, 15th Floor New York NY 10001	Common	06/04/2025	2444	40849.02
AARON SALTZ 1250 Broadway, 15th Floor New York NY 10001	Common	06/04/2025	2614	43690.40

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

Who is selling shares in this Form 144 for Magnite (MGNI)?

The filing identifies the seller as Aaron Saltz with an address at 1250 Broadway, 15th Floor, New York, NY 10001.

How many shares and what dollar value are proposed to be sold under this Form 144?

The notice proposes the sale of 13,860 common shares with an aggregate market value of $323,518.47.

When and where is the proposed sale expected to occur?

The approximate date of sale is listed as 08/14/2025 and the securities exchange is NASDAQ; the broker named is Morgan Stanley Smith Barney LLC.

What is the relationship between the acquisition lots and the shares to be sold?

The filing lists five acquisition lots (restricted stock and ESPP) totaling 13,860 shares, which matches the number proposed for sale.

Has the filer sold other Magnite shares recently?

Yes; the filer reported six sales in June 2025 totaling 49,692 shares and gross proceeds of roughly $1,037,445.38 across those transactions.