MPWR: Selling holder (S. Tseng) reports large common‑stock sales and performance shares

Rhea-AI Filing Summary

MPWR related filing reports proposed and recent dispositions of Common Stock by an affiliated selling holder. The filing lists four blocks of Performance Shares eligible for sale (2,980; 811; 2,377; 1,397 shares) and multiple sales by Saria Tseng in the past three months (examples: 25,674 shares on 03/30/2026, 8,964 shares on 04/08/2026). The filing is a regulatory notice of resale activity.

Insights

Securities Compliance Analyst

Forms show resale notice and recent insider sales; documentation focuses on quantities and dates.

The excerpt lists specific Performance Shares entries of 2,980, 811, 2,377, and 1,397 shares as securities to be sold. It also records actual sales by Saria Tseng including 25,674 shares on 03/30/2026 with proceeds shown.

These items are administrative disclosures under resale rules; cash‑flow treatment and any limits on resale are not stated in the provided excerpt.

Key Figures

Performance Shares block 1: 2,980 shares Performance Shares block 2: 811 shares Performance Shares block 3: 2,377 shares +5 more

8 metrics

Performance Shares block 1 2,980 shares listed as Performance Shares dated 02/07/2022

Performance Shares block 2 811 shares listed as Performance Shares dated 02/03/2022

Performance Shares block 3 2,377 shares listed as Performance Shares dated 11/11/2022

Performance Shares block 4 1,397 shares listed as Performance Shares dated 01/01/2024

Sale example — 03/30/2026 25,674 shares sale by Saria Tseng on 03/30/2026 with proceeds shown

Proceeds example — 03/30/2026 $25,943,648.15 proceeds reported for 25,674 shares sold on 03/30/2026

Sale example — 04/08/2026 8,964 shares sale by Saria Tseng on 04/08/2026

Proceeds example — 04/08/2026 $11,699,941.28 proceeds reported for 8,964 shares sold on 04/08/2026

Key Terms

Form 144, Performance Shares, Securities To Be Sold

3 terms

Form 144 regulatory

"Form identifier for resale notice and selling holder disclosures"

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

"Listed securities to be sold with grant dates and share counts"

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.

Securities To Be Sold regulatory

"Section heading listing issuer‑designated Performance Shares and counts"

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	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	7565	12860500.00	49130000	05/27/2026	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	02/07/2022	Performance Shares	Issuer			2980	02/07/2022	Not Applicable
Common	02/03/2022	Performance Shares	Issuer			811	02/03/2022	Not Applicable
Common	11/11/2022	Performance Shares	Issuer			2377	11/11/2022	Not Applicable
Common	01/01/2024	Performance Shares	Issuer			1397	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	05/22/2026	5000	7932150.00
SARIA TSENG 1555 Palm Beach Lakes Blvd. West Palm Beach FL 33401	Common	04/08/2026	8964	11699941.28
SARIA TSENG 1555 Palm Beach Lakes Blvd. West Palm Beach FL 33401	Common	04/06/2026	7636	8918428.78
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

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 disclose?

It discloses proposed and completed dispositions of Common Stock by a selling holder. The excerpt lists four Performance Share blocks (2,980; 811; 2,377; 1,397) and multiple sales by Saria Tseng in March–May 2026.

Who executed recent sales listed in the filing for MPWR?

The filing lists sales by Saria Tseng as the selling person. Examples include 25,674 shares sold on 03/30/2026 and 8,964 shares sold on 04/08/2026 with proceeds shown.

Are the Performance Shares in the filing described as issuer‑granted?

Yes. The securities labeled Performance Shares are shown with an "Issuer" designation and dated grant entries such as 02/07/2022 and 11/11/2022 totaling listed share amounts.

Does the excerpt state proceeds received from the recent sales?

Yes. The sales entries include proceeds for each listed trade (for example, proceeds of 25,943,648.15 shown for 25,674 shares on 03/30/2026). The filing excerpt pairs share quantities with dollar proceeds.