Insider Blegen files to sell 3,000 MPWR (MPWR) shares after prior sales

Rhea-AI Filing Summary

Monolithic Power Systems investor notice: A holder named Bernie Blegen has filed to sell 3,000 shares of MPWR common stock through Morgan Stanley Smith Barney LLC on NASDAQ, with an aggregate market value of 3,389,269.80. The filing states that 47,907,000 shares of common stock were outstanding.

The 3,000 shares to be sold were acquired as performance shares from the issuer on 01/01/2024. The notice also lists prior sales over the past three months, including three separate 3,000‑share transactions with gross proceeds of 2,724,621.30, 3,073,277.40, and 2,821,403.10.

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	3389269.80	47907000	02/02/2026	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	01/01/2024	Performance Shares	ISSUER			3000	01/01/2024	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 1555 Palm Beach Lakes Blvd. West Palm Beach FL 33401	Common	12/01/2025	3000	2724621.30
BERNIE BLEGEN 1555 Palm Beach Lakes Blvd. West Palm Beach FL 33401	Common	11/03/2025	3000	3073277.40
THEODORE BERNHARD BLEGEN 1555 Palm Beach Lakes Blvd. West Palm Beach FL 33401	Common	01/02/2026	3000	2821403.10

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 filing for MPWR disclose?

The filing discloses a planned sale of 3,000 MPWR common shares by a holder named Bernie Blegen. It also provides details on prior sales over the last three months and confirms 47,907,000 common shares outstanding at the time referenced.

How many MPWR shares are planned to be sold under this Form 144?

The notice covers a proposed sale of 3,000 shares of MPWR common stock. These shares are to be sold through Morgan Stanley Smith Barney LLC on NASDAQ and were originally acquired as performance shares from the issuer on January 1, 2024.

What is the aggregate market value of the MPWR shares in this planned sale?

The 3,000 MPWR common shares covered by this notice have an aggregate market value of 3,389,269.80. This figure reflects the market value used in the Form 144 filing for the proposed sale on NASDAQ.

What prior MPWR share sales are reported in this Form 144?

The filing lists three prior sales of 3,000 MPWR common shares each, dated November 3, 2025, December 1, 2025, and January 2, 2026. Gross proceeds were 3,073,277.40, 2,724,621.30, and 2,821,403.10, respectively.

How were the MPWR shares in this Form 144 originally acquired?

The 3,000 MPWR shares were acquired on 01/01/2024 as performance shares from the issuer. The filing records this as the nature of the acquisition transaction, with the issuer listed as the party from whom the shares were obtained.

What does the Form 144 say about MPWR shares outstanding?

The notice states that 47,907,000 shares of MPWR common stock were outstanding. This figure provides context for the planned 3,000‑share sale described in the filing, but is not itself part of the sale amount.