MPWR files Rule 144 notice to sell 400 shares

MPWR filed a Rule 144 notice reporting the intended sale of 400 shares of Common Stock.

Rhea-AI Filing Summary

MPWR filed a Rule 144 notice reporting the intended sale of 400 shares of Common Stock. The filing lists two GRAT distributions to Maurice Sciammas dated 08/19/2025 (80 shares from 05/02/2018 and 320 shares from 05/07/2014) and names UBS Financial Services Inc. as the broker.

Key Figures

Shares reported for sale: 400 shares GRAT distribution (entry 1): 80 shares GRAT distribution (entry 2): 320 shares +3 more

6 metrics

Shares reported for sale 400 shares Form 144 securities to be sold

GRAT distribution (entry 1) 80 shares GRAT distribution dated 08/19/2025; original date 05/02/2018

GRAT distribution (entry 2) 320 shares GRAT distribution dated 08/19/2025; original date 05/07/2014

Broker listed UBS Financial Services Inc. Broker on Form 144 cover rows

Exchange NASDAQ Exchange listed on the filing

Filing date/anchor 05/05/2026 Date shown near securities header

Key Terms

Rule 144, GRAT distribution, Form 144

3 terms

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.

GRAT distribution financial

"08/19/2025 | GRAT Distribution | Maurice Sciammas"

Form 144 regulatory

"form_type: 144"

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.

FAQ

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

What does MPWR's Form 144 report?

The Form 144 reports an intended sale of 400 shares of MPWR common stock. It lists two GRAT distributions totaling 400 shares to Maurice Sciammas with a broker identified as UBS Financial Services Inc.

Who is the selling party named in MPWR's filing?

The filing identifies Maurice Sciammas in connection with GRAT distributions dated 08/19/2025. The entries show 80 shares (from 05/02/2018) and 320 shares (from 05/07/2014), totaling 400 shares.

Which broker is listed in the MPWR Form 144?

The filing names UBS Financial Services Inc. at 1000 Harbor Blvd, Weehawken, NJ. The broker entry appears alongside the Common Stock and the 400-share amount in the notice.

When are the distributions tied to MPWR's Form 144 dated?

The GRAT distributions are dated 08/19/2025. Source rows show underlying grant dates of 05/02/2018 (80 shares) and 05/07/2014 (320 shares) associated with those distributions.

Does MPWR's Form 144 indicate where the shares will be sold?

The notice lists NASDAQ as the exchange and names UBS Financial Services Inc. as the broker. The filing does not specify transaction timing beyond the listed dates.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Accepted by SEC EDGAR 05/05/2026 - 10:50 AM 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	Rosalind 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	Member of immediate family of any of the foregoing

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	UBS Financial Services Inc 1000 Harbor Blvd 3rd Floor Weehawken NJ 07086	400	600000	49890000	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 Stock	08/19/2025	GRAT Distribution	Maurice Sciammas		05/02/2018	80	05/02/2018	N/A
Common Stock	08/19/2025	GRAT Distribution	Maurice Sciammas		05/07/2014	320	08/19/2025	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

Nothing to Report

144: Remarks and Signature

Remarks	Rosalind Sciammas is the seller; she is the sister of Maurice Sciammas, who is Executive Vice President at Monolithic Power Systems Inc.
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/Mijo Suric, for UBS Financial Services Inc, as attorney-in-fact for Rosalind Sciammas
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)