Maurice Sciammas plans MPWR (NASDAQ: MPWR) Rule 144 sale of 21,590 shares

Rhea-AI Filing Summary

Monolithic Power Systems insider Maurice Sciammas has filed a notice of intent to sell common stock under SEC Rule 144. The filing covers 21,590 shares of common stock, with an aggregate market value of 25,148,679.70, to be sold through Morgan Stanley Smith Barney LLC on NASDAQ.

The 21,590 shares were acquired on 02/03/2026 as performance-based restricted stock units from the issuer. As context, the filing lists 48,710,953 shares of common stock outstanding and notes prior sales by Sciammas in the last three months totaling 38,976 shares of common stock for gross proceeds of 34,337,784.48.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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 Stock	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York FL 10004	21590	25148679.70	48710953	02/04/2026	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 Stock	02/03/2026	Performance-based restricted stock units	Issuer			21590	02/03/2026	N/A

* 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 98033	Common Stock	11/19/2025	35000	30777350.00
Maurice Sciammas 1555 PALM BEACH LAKES BLVD. WEST PALM BEACH FL 33401	Common Stock	11/24/2025	3976	3559434.48

144: Remarks and Signature

Remarks

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the MPWR Form 144 filing by Maurice Sciammas disclose?

The Form 144 notice states that Maurice Sciammas intends to sell 21,590 shares of Monolithic Power Systems common stock. These shares are to be sold on NASDAQ through Morgan Stanley Smith Barney LLC, with an aggregate market value of 25,148,679.70.

How many MPWR shares is Maurice Sciammas planning to sell under Rule 144?

Maurice Sciammas plans to sell 21,590 shares of Monolithic Power Systems common stock. The filing lists an aggregate market value of 25,148,679.70 for these shares and indicates they will be sold on NASDAQ through Morgan Stanley Smith Barney LLC.

When and how did Maurice Sciammas acquire the MPWR shares to be sold?

The 21,590 Monolithic Power Systems shares were acquired on 02/03/2026 as performance-based restricted stock units from the issuer. The filing notes the acquisition date, transaction type, and that no separate cash payment description was required, marked as “N/A.”

What prior MPWR stock sales by Maurice Sciammas are reported in this Form 144?

The notice lists two recent sales of Monolithic Power Systems common stock by Maurice Sciammas. He sold 35,000 shares on 11/19/2025 for gross proceeds of 30,777,350.00, and 3,976 shares on 11/24/2025 for gross proceeds of 3,559,434.48.

How many Monolithic Power Systems shares are outstanding in this Form 144?

The filing reports that 48,710,953 shares of Monolithic Power Systems common stock are outstanding. This figure provides context for the planned sale of 21,590 shares under Rule 144 through Morgan Stanley Smith Barney LLC on NASDAQ.

Which broker will handle Maurice Sciammas’s planned MPWR share sale?

The Form 144 identifies Morgan Stanley Smith Barney LLC Executive Financial Services as the broker. The firm, located at 1 New York Plaza, 8th Floor, New York, is listed to handle the planned sale of 21,590 Monolithic Power Systems common shares on NASDAQ.