Morgan Stanley Smith Barney files Form 144 for MPWR

Morgan Stanley Smith Barney LLC submitted a Form 144 notifying the SEC of proposed sales of Common Stock of MPWR.

Rhea-AI Filing Summary

Morgan Stanley Smith Barney LLC submitted a Form 144 notifying the SEC of proposed sales of Common Stock of MPWR.

The filing is dated 05/05/2026 and lists NASDAQ as the market. The header shows the figures 1609285.29 and 49130000. The securities to be sold are listed as Restricted Stock with example lot sizes including 227 (02/07/2013) and 348 (02/06/2025).

Key Figures

Header figure: 1609285.29 Header figure: 49130000 Filing date: 05/05/2026 +5 more

8 metrics

Header figure 1609285.29 Listed in the filing header

Header figure 49130000 Listed in the filing header

Filing date 05/05/2026 Date shown in the header

Exchange NASDAQ Market listed in the header

Lot example 227 shares Restricted stock dated 02/07/2013

Lot example 348 shares Restricted stock dated 02/06/2025

Lot example 166 shares Restricted stock dated 02/05/2014

Lot example 273 shares Restricted stock dated 02/07/2013

Key Terms

Form 144, Restricted Stock, Issuer, NASDAQ

4 terms

Form 144 regulatory

"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.

Restricted Stock financial

"Securities To Be Sold | Restricted Stock | Issuer"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

Issuer regulatory

"Restricted Stock | Issuer"

NASDAQ market

"05/05/2026 | NASDAQ"

The Nasdaq is a stock exchange where many companies' shares are bought and sold, functioning much like a marketplace for investments. It matters to investors because it provides a platform to buy and sell ownership stakes in companies, helping them track the value of those companies and make informed decisions. As one of the largest and most technology-focused markets, it also reflects trends and developments in the business world.

FAQ

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

What does the Form 144 filed for MPWR mean?

It notifies the SEC of an intended sale of MPWR common stock under Rule 144. The form lists proposed restricted stock sales and dates, indicating planned dispositions subject to Rule 144 conditions and market availability.

Who is selling MPWR shares according to this filing?

The filer is Morgan Stanley Smith Barney LLC, named in the header. The filing lists the firm as the reporting broker-dealer and identifies lots of restricted common stock dated 2013–2025.

What quantities or lots are shown in the MPWR Form 144?

The excerpt shows example lot sizes of 227 shares (02/07/2013) and 348 shares (02/06/2025). Additional lots of 166 and 273 shares also appear in the securities table.

When was this Form 144 filed and on which exchange is MPWR listed?

The filing date shown is 05/05/2026 and the exchange listed is NASDAQ. These entries appear in the header rows of the provided excerpt.

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

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Accepted by SEC EDGAR 05/05/2026 - 05:03 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	0001480772
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	(561) 839-3999
Name of Person for Whose Account the Securities are To Be Sold	JEFF ZHOU
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	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	1014	1609285.29	49130000	05/05/2026	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	02/07/2013	Restricted Stock	Issuer			227	02/07/2013	Not Applicable
Common	02/06/2025	Restricted Stock	Issuer			348	02/06/2025	Not Applicable
Common	02/05/2014	Restricted Stock	Issuer			166	02/05/2014	Not Applicable
Common	02/07/2013	Restricted Stock	Issuer			273	02/07/2013	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	05/05/2026
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/ Jeff Zhou
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)