Monolithic Power (MPWR) Form 144 Notice for 14,510 Share Sale

Rhea-AI Filing Summary

Form 144 notice from Monolithic Power Systems, Inc. (MPWR) discloses a proposed sale of 14,510 common shares through Morgan Stanley Smith Barney LLC on 09/18/2025 on the NASDAQ with an aggregate market value of $13,268,669.50. The shares were acquired as performance shares from the issuer on 07/20/2023 and the filing reports no securities sold in the past three months by the selling person. The filer attests they are not aware of undisclosed material adverse information and the notice includes the standard signatures and Rule 10b5-1 plan disclosure fields.

Insights

Securities Analyst

TL;DR: Insider proposes to sell 14,510 shares valued at $13.27M; acquired as 2023 performance shares.

The filing notifies the market of a proposed sale under Rule 144: 14,510 common shares to be sold via Morgan Stanley on 09/18/2025 with an aggregate market value of $13,268,669.50. These shares were granted as performance shares on 07/20/2023. The filer reports no sales in the prior three months and affirms lack of undisclosed material adverse information. As a procedural disclosure, this informs liquidity expectations for the specified lot but does not by itself reveal intent beyond the sale notice.

Corporate Governance Expert

TL;DR: Routine Rule 144 notice for vested performance shares; standard attestations present.

The notice documents a proposed sale of vested performance shares by a person related to the issuer, filed on a live submission channel and listing Morgan Stanley Smith Barney LLC as broker. The form includes the required representation regarding material non-public information and fields for Rule 10b5-1 plan dates though no plan date is shown. This is a compliance-focused disclosure and, based solely on the form's contents, is a routine transfer notification rather than a governance event.

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	14510	13268669.50	47892000	09/18/2025	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	07/20/2023	Performance Shares	ISSUER			14510	07/20/2023	Not Applicable

* 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

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

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 MPWR Form 144 disclose about the planned sale?

The filing discloses a proposed sale of 14,510 common shares on 09/18/2025 through Morgan Stanley Smith Barney LLC on NASDAQ with an aggregate market value of $13,268,669.50.

When and how were the shares being sold acquired?

The shares were acquired as performance shares from the issuer on 07/20/2023.

Does the filing report other recent sales by the same person?

No. The filing states "Nothing to Report" for securities sold during the past three months.

Does the filer attest to possession of material non-public information?

Yes. The filer represents by signing the notice that they do not know any material adverse information about the issuer that has not been publicly disclosed.

Which broker is handling the proposed sale?

The sale is to be executed through Morgan Stanley Smith Barney LLC, Executive Financial Services, 1 New York Plaza, 8th Floor, New York NY 10004.