MONOLITHIC POWER SYSTEMS INC SEC Filing

Monolithic Power Systems insider Michael Hsing filed a notice to sell 33,000 shares of MPWR common stock under Rule 144.

Rhea-AI Filing Summary

Monolithic Power Systems insider Michael Hsing filed a notice to sell 33,000 shares of MPWR common stock under Rule 144. The shares were acquired on 02/03/2026 as performance shares from the issuer and are to be sold through Morgan Stanley Smith Barney LLC on NASDAQ.

The planned sale has an aggregate market value of $39,234,171.90, based on 47,907,000 shares of common stock outstanding. Over the prior three months, Hsing reported additional MPWR common stock sales totaling 34,000 shares on 02/10/2026, 54,923 shares on 02/06/2026, and 30,000 shares on 11/12/2025.

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Accepted by SEC EDGAR 02/11/2026 - 04:47 PM EST Learn about SEC filing dates

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	0001308676
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	MONOLITHIC POWER SYSTEMS, INC.
SEC File Number	000-51026
Address of Issuer	1555 Palm Beach Lakes Blvd. West Palm Beach FLORIDA 33401
Phone	(425) 296-9956
Name of Person for Whose Account the Securities are To Be Sold	MICHAEL HSING
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	Officer
Relationship to Issuer	Director

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	33000	39234171.90	47907000	02/11/2026	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	02/03/2026	Performance Shares	ISSUER			33000	02/03/2026	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
MICHAEL HSING 1555 Palm Beach Lakes Blvd. West Palm Beach FL 33401	Common	02/10/2026	34000	38837373.80
Michael Hsing 1555 Palm Beach Lakes Blvd. West Palm Beach FL 33401	Common	02/06/2026	54923	64323823.90
Michael Hsing 1555 Palm Beach Lakes Blvd. West Palm Beach FL 33401	Common	11/12/2025	30000	28958826.00

144: Remarks and Signature

Remarks
Date of Notice	02/11/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	08/28/2025
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	/s/ Michael Hsing
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)