MPWR files Rule 144 notice for Common stock resale

MPWR submitted a Rule 144 notice listing resale of Common stock that originated as restricted stock dated 02/07/2013.

Rhea-AI Filing Summary

MPWR submitted a Rule 144 notice listing resale of Common stock that originated as restricted stock dated 02/07/2013. The filing shows two reported dispositions by Jeff Zhou: 1,014 shares on 05/05/2026 and 500 shares on 05/06/2026, with dollar amounts displayed alongside each sale.

Key Figures

Restricted stock grant date: 02/07/2013 Disposition by Jeff Zhou: 1,014 shares Disposition by Jeff Zhou: 500 shares +4 more

7 metrics

Restricted stock grant date 02/07/2013 Grant date for the Common restricted stock listed in the filing

Disposition by Jeff Zhou 1,014 shares Sale dated 05/05/2026 as shown in the filing

Disposition by Jeff Zhou 500 shares Sale dated 05/06/2026 as shown in the filing

Dollar amount reported for 1,014-share sale $1,609,285.29 Amount printed adjacent to the 1,014-share line dated 05/05/2026

Dollar amount reported for 500-share sale $825,000.00 Amount printed adjacent to the 500-share line dated 05/06/2026

Broker/agent Morgan Stanley Smith Barney LLC Named in the filer information section

Exchange/Date line 05/26/2026 Date shown near exchange/filing line in the securities section

Key Terms

Restricted Stock, Rule 144, Filer/Broker

3 terms

Restricted Stock financial

"Common | 02/07/2013 | 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.

Rule 144 regulatory

"144: Securities To Be Sold"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Filer/Broker other

"Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza"

FAQ

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

What does MPWR's Form 144 disclose about the securities?

The filing discloses resale of Common stock originally issued as restricted stock on 02/07/2013. It lists individual dispositions with share counts and associated dollar figures, and names the broker as Morgan Stanley Smith Barney LLC.

How many shares did Jeff Zhou report selling in these entries?

The excerpt shows 1,014 shares sold on 05/05/2026 and 500 shares sold on 05/06/2026. Each sale line in the filing also includes an associated dollar amount recorded next to the share count.

Does the Form 144 state the original grant date for the restricted shares?

Yes. The restricted stock grant date is listed as 02/07/2013. That date appears in the filing's securities section tied to the Common restricted stock description.

Who is the broker or selling agent named in the filing?

The filing names Morgan Stanley Smith Barney LLC, 1 New York Plaza as the broker/agent. The broker address and role are printed in the securities and filer information lines.

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

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Accepted by SEC EDGAR 05/26/2026 - 04:06 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	486	816480.00	49130000	05/26/2026	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			486	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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
JEFF ZHOU 1555 Palm Beach Lakes Blvd. West Palm Beach FL 33401	Common	05/06/2026	500	825000.00
JEFF ZHOU 1555 Palm Beach Lakes Blvd. West Palm Beach FL 33401	Common	05/05/2026	1014	1609285.29

144: Remarks and Signature

Remarks
Date of Notice	05/26/2026
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)