Insider share sale notice filed for issuer (NASDAQ: MPWR)

Rhea-AI Filing Summary

Michael Hsing has filed a notice to sell 3,082 shares of common stock under Rule 144. The planned sale will be executed through Morgan Stanley Smith Barney LLC on NASDAQ, with an aggregate market value of 3609222.00.

The 3,082 shares were acquired on 02/03/2026 as performance-based restricted stock units from the issuer. The filing notes that there were 48,710,953 shares of this class outstanding at the time of the notice.

Over the prior three months, the same seller disposed of additional common stock: 40,000 shares for gross proceeds of 38335600.00 on 11/11/2025, 30,000 shares for 28958700.00 on 11/12/2025, and 51,841 shares for 60714106.00 on 02/04/2026. The signer represents they are not aware of undisclosed material adverse information about the issuer.

Insights

Insider transactions analyst

Rule 144 filing shows sizeable ongoing insider share sales, but motives are not disclosed.

The notice covers a planned sale of 3,082 common shares with an aggregate market value of 3609222.00. These shares were recently acquired on 02/03/2026 as performance-based restricted stock units from the issuer, indicating compensation-linked equity rather than open-market purchases.

The disclosure also lists prior sales by Michael Hsing over the past three months: 40,000, 30,000, and 51,841 shares on 11/11/2025, 11/12/2025, and 02/04/2026, respectively, with gross proceeds ranging from 28958700.00 to 60714106.00. Rule 144 requires this notice when affiliates sell larger blocks, so this filing primarily provides transparency on those transactions.

The seller certifies they are not aware of any undisclosed material adverse information about the issuer’s current or prospective operations. The filing does not state reasons for the sales or any changes in the issuer’s fundamentals, so the informational impact centers on awareness of transaction size and timing rather than new operating data.

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

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	3082	3609222.00	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			3082	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
Michael Hsing 1555 PALM BEACH LAKES BLVD. WEST PALM BEACH FL 33401	Common Stock	11/11/2025	40000	38335600.00
Michael Hsing 1555 PALM BEACH LAKES BLVD. WEST PALM BEACH FL 33401	Common Stock	11/12/2025	30000	28958700.00
Michael Hsing 1555 PALM BEACH LAKES BLVD. WEST PALM BEACH FL 33401	Common Stock	02/04/2026	51841	60714106.00

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 Rule 144 filing disclose about the new planned share sale?

The filing discloses a planned sale of 3,082 common shares. These shares have an aggregate market value of 3609222.00 and will be sold through Morgan Stanley Smith Barney LLC on NASDAQ. The shares were acquired as performance-based restricted stock units on 02/03/2026.

How many MPWR shares has Michael Hsing sold in the past three months?

The filing lists three prior sales totaling 121,841 shares. It shows 40,000 shares sold on 11/11/2025, 30,000 on 11/12/2025, and 51,841 on 02/04/2026, with gross proceeds of 38335600.00, 28958700.00, and 60714106.00, respectively.

How were the 3,082 MPWR shares in the new sale obtained?

The 3,082 shares were acquired as performance-based restricted stock units. According to the disclosure, they were received from the issuer on 02/03/2026. The same date is listed as the payment date, and the nature of payment is described as N/A, consistent with equity compensation grants.

What does the MPWR Rule 144 filer say about material nonpublic information?

The seller represents they do not know of undisclosed material adverse information. By signing the notice, the person for whose account the securities are to be sold states they are unaware of material adverse information about the issuer’s current or prospective operations that has not been publicly disclosed.

How many MPWR common shares are outstanding according to this notice?

The notice reports 48,710,953 common shares outstanding. This figure appears in the securities information section alongside the planned sale of 3,082 shares. It provides a baseline context for the issuer’s total common stock at the time of the filing.

Which broker and exchange are involved in the MPWR planned share sale?

The planned sale will use Morgan Stanley Smith Barney LLC on NASDAQ. The broker’s address is listed as 1 New York Plaza, 8th Floor, New York, FL 10004, and NASDAQ is named as the securities exchange for executing the 3,082-share transaction.