Monolithic Power Systems (MPWR) Insider Plans 3,000-Share Sale on Sep 2, 2025

Rhea-AI Filing Summary

Form 144 filing for Monolithic Power Systems, Inc. (MPWR) states that an insider intends to sell 3,000 shares of common stock through Morgan Stanley Smith Barney on 09/02/2025, with an aggregate market value reported as $2,443,025.70. The 3,000 shares match performance awards acquired in 2023 (dates: 05/07/2023, 06/30/2023, 07/20/2023 totaling 3,000 shares). The filer also reported prior sales by the same person of 6,000 shares on 07/01/2025 for $4,500,000.00 and 3,000 shares on 08/01/2025 for $2,250,000.00. The notice includes the signature representation that the seller is not aware of undisclosed material adverse information about the issuer.

Positive

• Clear disclosure of broker, number of shares, aggregate market value, and exact sale date
• Shares sold correspond to performance awards acquired in 2023, indicating sale of vested compensation rather than newly purchased shares
• Previous sales provided for context with exact gross proceeds, improving transparency

Negative

• Insider selling of 9,000 shares in recent months could be perceived negatively by some investors
• No 10b5-1 plan date is indicated in the filing, so the sale may not be pre-scheduled

Insights

Securities Analyst

TL;DR: Insider sale of 3,000 shares from 2023 performance awards; amounts are modest relative to company market cap but notable as recent insider activity.

The filing documents a planned sale of 3,000 common shares valued at $2.44 million via a major broker on September 2, 2025. The shares were acquired as performance awards in 2023 and the filer disclosed two prior sales in July and August 2025 totaling 9,000 shares and $6.75 million in gross proceeds. From a trading-flow perspective, this is a routine Rule 144 notice showing insider monetization of vested performance equity rather than a market-moving corporate event. Trackable data includes exact sale dates, broker, and prior sale amounts which permit calculation of realized prices from recent transactions.

Corporate Governance Expert

TL;DR: Disclosure is procedurally complete and includes the seller's representation about material non-public information; no governance red flags are evident from the notice alone.

The Form 144 provides required details: class, broker, number of shares, aggregate market value, acquisition dates and nature (performance shares), and recent sales by the same person. The seller affirms lack of undisclosed material adverse information and cites no 10b5-1 plan date. As a governance matter, the filing documents transparent insider selling of earned equity but does not indicate misconduct or irregularity within the information 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	3000	2443025.70	47892000	09/02/2025	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			1906	07/20/2023	Not Applicable
Common	05/07/2023	Performance Shares	ISSUER			199	05/07/2023	Not Applicable
Common	06/30/2023	Performance Shares	ISSUER			895	06/30/2023	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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
BERNIE BLEGEN 5808 Lake Washington Blvd. NE Kirkland WA 98033	Common	08/01/2025	3000	2250000.00
BERNIE BLEGEN 5808 Lake Washington Blvd. NE Kirkland WA 98033	Common	07/01/2025	6000	4500000.00

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 upcoming sale?

The filing discloses a proposed sale of 3,000 common shares via Morgan Stanley Smith Barney on 09/02/2025 with an aggregate market value of $2,443,025.70.

Were the shares being sold recently acquired by the insider at Monolithic Power Systems (MPWR)?

Yes. The 3,000 shares were acquired as performance shares on 05/07/2023, 06/30/2023, and 07/20/2023.

Has the insider sold other MPWR shares in the past three months?

Yes. The filing reports sales of 6,000 shares on 07/01/2025 for $4,500,000.00 and 3,000 shares on 08/01/2025 for $2,250,000.00.

Through which broker will the MPWR shares be sold?

The sale is to be executed through Morgan Stanley Smith Barney LLC, Executive Financial Services.

Does the Form 144 state whether the seller knows any undisclosed material information?

Yes. The signer represents they do not know of any material adverse information about the issuer that is not publicly disclosed.