MPWR Form 144: Insider notice for Saria Tseng proposed sales

MPWR filing a Form 144 notice for proposed sales of Common stock by an individual Saria Tseng.

Rhea-AI Filing Summary

MPWR filing a Form 144 notice for proposed sales of Common stock by an individual Saria Tseng. The excerpt lists three proposed sale dates with share counts: 1,400 on 04/01/2026, 25,674 on 03/30/2026, and 22,876 on 02/06/2026. The filing names Morgan Stanley Smith Barney LLC as the broker.

Key Figures

Proposed sale 04/01/2026: 1,400 shares Proposed sale 03/30/2026: 25,674 shares Proposed sale 02/06/2026: 22,876 shares +3 more

6 metrics

Proposed sale 04/01/2026 1,400 shares listed sale date <date>04/01/2026</date>

Proposed sale 03/30/2026 25,674 shares listed sale date <date>03/30/2026</date>

Proposed sale 02/06/2026 22,876 shares listed sale date <date>02/06/2026</date>

Dollar figure 04/01/2026 line 1,586,924.78 amount adjacent to 1,400-share line

Dollar figure 03/30/2026 line 25,943,648.15 amount adjacent to 25,674-share line

Dollar figure 02/06/2026 line 26,791,540.80 amount adjacent to 22,876-share line

Key Terms

Form 144, Performance Shares, Broker

3 terms

Form 144 regulatory

"144: Securities Sold During The Past 3 Months"

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

"Securities To Be Sold | 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.

Broker market

"Morgan Stanley Smith Barney LLC Executive Financial Services"

A broker is a licensed professional or firm that helps investors buy and sell financial assets by executing trades on their behalf, acting like a marketplace agent or matchmaker between buyers and sellers. Brokers matter to investors because they provide access to markets, handle order execution and paperwork, and can offer research or advice—services that affect trade speed, costs, and the quality of investment decisions.

FAQ

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

What does MPWR's Form 144 disclose about the proposed sales?

The Form 144 lists proposed sales of Common stock by Saria Tseng on specific dates. It shows 1,400, 25,674, and 22,876 shares tied to 04/01/2026, 03/30/2026, and 02/06/2026 respectively.

Who is the broker listed on the MPWR Form 144?

The filing lists Morgan Stanley Smith Barney LLC as the broker. The broker address shown is 1 New York Plaza, 8th Floor, New York, NY 10004 in the excerpt.

Does the Form 144 show proceeds or dollar values for the proposed sales?

The excerpt includes numeric dollar-like figures adjacent to each sale line, such as 1,586,924.78, 25,943,648.15, and 26,791,540.80, presented next to the listed share counts in the table.

Who is the reporting holder named in the MPWR Form 144?

The reporting person named is Saria Tseng with an address at 1555 Palm Beach Lakes Blvd., West Palm Beach, FL 33401 as shown in the excerpt.

What security type is covered by this Form 144 for MPWR?

The excerpt identifies the security as Common stock and references Performance Shares with an original date shown as 01/01/2024 in the securities section.

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

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Accepted by SEC EDGAR 04/06/2026 - 05:04 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	0001312593
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	SARIA TSENG
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	7636	8918428.78	49118000	04/06/2026	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	01/01/2024	Performance Shares	ISSUER			7636	01/01/2024	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
SARIA TSENG 1555 Palm Beach Lakes Blvd. West Palm Beach FL 33401	Common	04/01/2026	1400	1586924.78
SARIA TSENG 1555 Palm Beach Lakes Blvd. West Palm Beach FL 33401	Common	03/30/2026	25674	25943648.15
SARIA TSENG 1555 Palm Beach Lakes Blvd. West Palm Beach FL 33401	Common	02/06/2026	22876	26791540.80

144: Remarks and Signature

Remarks
Date of Notice	04/06/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/28/2025
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/ Saria Tseng
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)