Monolithic Power (MPWR) Form 144: 3,000 Shares Proposed Sale on NASDAQ

Rhea-AI Filing Summary

Form 144 filing for MPWR (Monolithic Power Systems Inc.): The notice reports a proposed sale of 3,000 common shares to be executed through Morgan Stanley Smith Barney LLC on 10/01/2025 on NASDAQ, with an aggregate market value of $2,739,643.80. The shares were acquired as performance shares from the issuer on 07/20/2023 and paid for on that date. The filing lists 47,892,000 shares outstanding for the class. The filer, identified in sale history as Bernie Blegen, sold 3,000, 3,000, and 6,000 common shares on 09/02/2025, 08/01/2025, and 07/01/2025 respectively, generating gross proceeds of $2,443,025.70, $2,250,000.00, and $4,500,000.00.

Insights

Financial Analyst

TL;DR: Insider proposes to sell 3,000 common shares; prior recent sales total 12,000 shares, with stated proceeds listed.

The filing documents a routine Rule 144 notice for the planned disposition of 3,000 common shares via Morgan Stanley Smith Barney on NASDAQ with an aggregate market value of $2,739,643.80. The shares were granted as performance shares on 07/20/2023. Recent sale history from the filer shows three transactions in the past three months totaling 12,000 shares and aggregate gross proceeds of $9,193,025.70. Relative to the reported 47,892,000 shares outstanding, the sizes disclosed here are very small on a percentage basis, indicating limited market impact from these specific transactions.

Corporate Governance Expert

TL;DR: This is a standard compliance filing under Rule 144 documenting insider sales and source of shares.

The notice includes the required attestations and shows the securities were acquired from the issuer as performance shares. The filer certifies no undisclosed material adverse information. The filing follows procedural requirements for reporting proposed off‑market sales by an insider or person covered by Rule 144; no governance actions or departures are disclosed in this document.

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	2739643.80	47892000	10/01/2025	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			3000	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

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	09/02/2025	3000	2443025.70
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 Form 144 for MPWR report?

It reports a proposed sale of 3,000 common shares through Morgan Stanley Smith Barney LLC on 10/01/2025 on NASDAQ with aggregate value $2,739,643.80.

Who acquired the shares and how were they acquired?

The 3,000 shares were acquired as performance shares from the issuer on 07/20/2023, with payment dated 07/20/2023.

Has the filer sold any MPWR shares recently?

Yes. The filing lists sales by Bernie Blegen of 6,000 shares on 07/01/2025 (gross proceeds $4,500,000.00), 3,000 on 08/01/2025 ($2,250,000.00), and 3,000 on 09/02/2025 ($2,443,025.70).

How many shares are outstanding for the class reported?

The filing reports 47,892,000 shares outstanding for the class.

Does the filer attest to material information status?

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.