MPWR holder files notice of potential stock sale

Rhea-AI Filing Summary

A holder of common stock of an issuer with shares listed on NASDAQ submitted a Form 144 indicating an intention to sell securities through UBS Financial Services Inc. The notice includes a common stock entry with figures of 142,000 and 49,130,000, and references RSU-related entries dated February 6, 2025 and February 4, 2026 with quantities of 91 and 9, respectively.

Key Figures

Common stock quantity figure: 142,000 Common stock value figure: 49,130,000 RSU quantity figure (02/06/2025): 91 +2 more

5 metrics

Common stock quantity figure 142,000 Figure shown in the common stock securities information row

Common stock value figure 49,130,000 Figure shown with the common stock securities information entry

RSU quantity figure (02/06/2025) 91 Quantity shown for RSU-related common stock entry dated February 6, 2025

RSU quantity figure (02/04/2026) 9 Quantity shown for RSU-related common stock entry dated February 4, 2026

Proposed sale date figure 08/11/2026 Date listed in the common stock securities information row

Key Terms

Form 144, Securities To Be Sold, RSU, Securities Sold During The Past 3 Months

4 terms

Form 144 regulatory

"144: Filer Information | | | 144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Securities To Be Sold regulatory

"144: Securities To Be Sold Common | 02/06/2025 | RSU | Issuer"

RSU financial

"Common | 02/06/2025 | RSU | Issuer | | | 91"

Restricted stock units (RSUs) are a form of company shares given to employees as part of their compensation, usually with certain restrictions or conditions, such as remaining with the company for a set period. When these restrictions lift, employees receive actual shares that they can sell or hold. For investors, RSUs can impact a company's stock supply and reflect the company's commitment to attracting and retaining talent.

Securities Sold During The Past 3 Months regulatory

"144: Securities Sold During The Past 3 Months 144: Remarks"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing for MPWR indicate?

The Form 144 for MPWR indicates that a security holder has given notice of a potential sale of common stock through UBS Financial Services Inc., including associated figures and related RSU entries from 2025 and 2026.

How many MPWR common shares are referenced in the Form 144?

The Form 144 references a common stock line with a figure of 142,000. It also lists RSU-related quantities of 91 and 9 tied to dates in 2025 and 2026, respectively.

What aggregate value is shown in the MPWR Form 144 entry?

The common stock entry in the MPWR Form 144 includes a figure of 49,130,000 alongside the quantity of 142,000. These numbers appear together in the securities information section for the proposed sale.

Which broker is named in the MPWR Form 144 filing?

The Form 144 for MPWR names UBS Financial Services Inc., located at 1000 Harbor Blvd, 3rd Floor, Weehawken, NJ 07086, in connection with the common stock securities information row.

What RSU-related details appear in the MPWR Form 144?

The filing lists two RSU-related entries for MPWR common stock: one dated February 6, 2025 with a quantity of 91, and another dated February 4, 2026 with a quantity of 9, both shown as RSU and acquired from the issuer.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 08/11/2026 - 12:28 PM EDT 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	0001192171
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	4252969956
Name of Person for Whose Account the Securities are To Be Sold	Kuo Wei Chang
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	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	UBS Financial Services Inc 1000 Harbor Blvd 3rd Floor Weehawken NJ 07086	100	142000	49130000	08/11/2026	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	02/06/2025	RSU	Issuer			91	02/06/2025	Not Applicable
Common	02/04/2026	RSU	Issuer			9	02/04/2026	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

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	08/11/2026
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/Mijo Suric, for UBS Financial Services Inc, as attorney-in-fact for Kuo Wei Chang
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)