Insider plans Rule 144 sale of 1286 MPWR shares

Maurice Sciammas filed a Rule 144 notice to sell 1286 shares of MPWR common stock through Morgan Stanley Smith Barney LLC on NASDAQ, with an approximate sale date of 02/06/2026.

Rhea-AI Filing Summary

Maurice Sciammas filed a Rule 144 notice to sell 1286 shares of MPWR common stock through Morgan Stanley Smith Barney LLC on NASDAQ, with an approximate sale date of 02/06/2026. The filing notes 48710953 shares of common stock outstanding.

The 1286 shares to be sold were acquired on 02/03/2026 as performance-based restricted stock units from the issuer, with payment also dated 02/03/2026. Over the past three months, Sciammas previously sold 35000, 3976, and 21590 common shares on 11/19/2025, 11/24/2025, and 02/04/2026 for gross proceeds of 30777350.00, 3559434.48, and 25285344.00.

FAQ

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

What does the Form 144 filing for MPWR show about Maurice Sciammas?

The Form 144 shows that Maurice Sciammas plans to sell 1286 shares of MPWR common stock through Morgan Stanley Smith Barney LLC. It also details prior three-month sales totaling several transactions with significant gross proceeds in MPWR shares.

How many MPWR shares are covered by Maurice Sciammas’s new planned Rule 144 sale?

The new planned Rule 144 sale covers 1286 MPWR common shares. These shares were acquired on 02/03/2026 as performance-based restricted stock units from the issuer, with the same date listed for payment of the consideration.

What prior MPWR stock sales has Maurice Sciammas reported in the last three months?

The filing lists three prior MPWR sales: 35000 shares on 11/19/2025, 3976 shares on 11/24/2025, and 21590 shares on 02/04/2026. Reported gross proceeds were 30777350.00, 3559434.48, and 25285344.00, respectively.

How were the 1286 MPWR shares being sold by Maurice Sciammas originally acquired?

The 1286 MPWR shares were acquired on 02/03/2026 as performance-based restricted stock units from the issuer. The filing lists that same date as the date of payment, with the nature of payment described as N/A in the table.

Which broker and exchange are involved in Maurice Sciammas’s planned MPWR share sale?

The planned sale will be executed through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, New York. The shares are listed for sale on NASDAQ, with an approximate sale date of 02/06/2026.

How many MPWR common shares are outstanding according to this Form 144?

The Form 144 lists 48710953 MPWR common shares outstanding in the securities information table. This figure provides context for the planned 1286-share Rule 144 sale disclosed by Maurice Sciammas.

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

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Accepted by SEC EDGAR 02/06/2026 - 08:56 PM 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	Sciammas Maurice
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 Stock	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York FL 10004	1286	1505526.00	48710953	02/06/2026	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			1286	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 33401	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
Maurice Sciammas 1555 PALM BEACH LAKES BLVD. WEST PALM BEACH FL 33401	Common Stock	02/04/2026	21590	25285344.00

144: Remarks and Signature

Remarks
Date of Notice	02/06/2026
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/ Maurice Sciammas
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)