MPWR Form 144: Proposed resale of 12,000 shares

MPWR filing reports proposed resale of 12,000 common shares through Morgan Stanley Smith Barney LLC with an execution date listed as 05/15/2026 on NASDAQ.

Rhea-AI Filing Summary

MPWR filing reports proposed resale of 12,000 common shares through Morgan Stanley Smith Barney LLC with an execution date listed as 05/15/2026 on NASDAQ. The filing also lists performance shares dated 10/25/2025 totaling 12,000 and recent sales by Maurice Sciammas: 380, 30, 30, and 30 common shares on 05/05/2026, 05/04/2026, 04/01/2026, and 03/20/2026, respectively.

Key Figures

Offered shares: 12,000 shares Execution date: 05/15/2026 Performance shares: 12,000 shares +3 more

6 metrics

Offered shares 12,000 shares listed under Securities To Be Sold

Execution date 05/15/2026 date associated with proposed sale on NASDAQ

Performance shares 12,000 shares Performance Shares dated 10/25/2025

Recent sale 380 shares sale by Maurice Sciammas on 05/05/2026

Recent sales (other) 30 shares; 30 shares; 30 shares sales by Maurice Sciammas on 05/04/2026, 04/01/2026, 03/20/2026

Dollar amount tied to 05/05/2026 sale $601,847.80 amount shown alongside 380-share sale

Key Terms

Form 144, Performance Shares, Issuer

3 terms

Form 144 regulatory

"144: Securities To Be Sold"

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.

Performance Shares financial

"Common | 10/25/2025 | Performance Shares"

Performance shares are a type of company stock given to executives or employees that only become theirs if the company meets specific goals, like hitting certain profits or growth targets. They motivate leaders to work toward the company’s success, because their additional shares depend on achieving these results.

Issuer regulatory

"ISSUER | 12000 | 10/25/2025"

FAQ

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

What does the MPWR Form 144 disclose about shares offered?

It discloses an offering of 12,000 common shares via Morgan Stanley Smith Barney LLC. The form lists an execution date of 05/15/2026 and indicates the shares are to be sold on NASDAQ.

Who is the broker handling the proposed sale in the MPWR filing?

Morgan Stanley Smith Barney LLC is listed as the broker with an address at 1 New York Plaza, 8th Floor, New York, NY. The filing pairs that broker entry with the 12,000 common shares offering.

What recent sales by Maurice Sciammas are shown in the MPWR filing?

Four recent dispositions are listed: 380 shares on 05/05/2026, and three trades of 30 shares on 05/04/2026, 04/01/2026, and 03/20/2026. Dollar figures accompany each trade in the excerpt.

Are the performance shares in the MPWR excerpt part of the sale?

The excerpt lists 12,000 performance shares dated 10/25/2025 under “Securities To Be Sold.” The line labels them Performance Shares with the issuer indicated, but sale mechanics or proceeds treatment are not detailed in the excerpt.

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

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Accepted by SEC EDGAR 05/15/2026 - 04:42 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	0001360833
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	MAURICE SCIAMMAS
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

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	12000	18736864.80	49130000	05/15/2026	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	10/25/2025	Performance Shares	ISSUER			12000	10/25/2025	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
MAURICE SCIAMMAS 1555 Palm Beach Lakes Blvd. West Palm Beach FL 33401	Common	05/05/2026	380	601847.80
MAURICE SCIAMMAS 1555 Palm Beach Lakes Blvd. West Palm Beach FL 33401	Common	05/04/2026	30	47661.90
MAURICE SCIAMMAS 1555 Palm Beach Lakes Blvd. West Palm Beach FL 33401	Common	04/01/2026	30	33493.20
MAURICE SCIAMMAS 1555 Palm Beach Lakes Blvd. West Palm Beach FL 33401	Common	03/20/2026	30	32852.10

144: Remarks and Signature

Remarks
Date of Notice	05/15/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/24/2025
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/ Maurice Sciammas
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)