Shareholder Bernie Blegen plans 20,730-share Rule 144 sale

Shareholder Bernie Blegen filed a Rule 144 notice to sell 20,730 shares of common stock through Morgan Stanley Smith Barney LLC around February 4, 2026 on NASDAQ, with an aggregate market value of $24,146,925.90 and 48,710,953 shares outstanding.

Rhea-AI Filing Summary

Shareholder Bernie Blegen filed a Rule 144 notice to sell 20,730 shares of common stock through Morgan Stanley Smith Barney LLC around February 4, 2026 on NASDAQ, with an aggregate market value of $24,146,925.90 and 48,710,953 shares outstanding.

The 20,730 shares were acquired on February 3, 2026 as performance-based restricted stock units from the issuer. Over the past three months, Blegen sold three blocks of 3,000 common shares each, with gross proceeds between $2,724,630.00 and $3,389,280.00.

FAQ

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

What does the MPWR Rule 144 filing by Bernie Blegen disclose?

The filing shows Bernie Blegen plans to sell 20,730 shares of common stock under Rule 144. The planned NASDAQ sale, via Morgan Stanley Smith Barney LLC, has an aggregate market value of $24,146,925.90 and follows several prior 3,000-share sales.

How many MPWR shares is Bernie Blegen planning to sell under Rule 144?

Bernie Blegen plans to sell 20,730 shares of common stock under Rule 144. These shares were acquired as performance-based restricted stock units on February 3, 2026 and are to be sold on NASDAQ through Morgan Stanley Smith Barney LLC.

When and how did Bernie Blegen acquire the MPWR shares being sold?

The 20,730 MPWR shares were acquired on February 3, 2026 as performance-based restricted stock units from the issuer. The filing notes this award as the nature of the acquisition, with the same date listed as the payment date and no gift indicated.

What recent MPWR stock sales has Bernie Blegen already completed?

Over the past three months, Bernie Blegen sold three blocks of 3,000 MPWR common shares each. These sales occurred on December 1, 2025, January 2, 2026, and February 2, 2026, generating gross proceeds of $2,724,630.00, $2,821,410.00, and $3,389,280.00 respectively.

What market value and share count are shown in the MPWR Rule 144 notice?

The notice lists 20,730 common shares to be sold with an aggregate market value of $24,146,925.90. It also states that 48,710,953 shares of the issuer’s common stock are outstanding, providing context for the planned sale’s size relative to total shares.

Which broker and exchange are involved in Bernie Blegen’s planned MPWR sale?

The planned Rule 144 sale will be executed through Morgan Stanley Smith Barney LLC Executive Financial Services. The filing specifies that the 20,730 common shares are expected to be sold on the NASDAQ exchange, giving clarity on both the intermediary and trading venue.

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

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Accepted by SEC EDGAR 02/04/2026 - 09:07 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	0001415033
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	BLEGEN THEODORE
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	20730	24146925.90	48710953	02/04/2026	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			20730	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
BERNIE BLEGEN 1555 PALM BEACH LAKES BLVD. WEST PALM BEACH FL 33401	Common Stock	12/01/2025	3000	2724630.00
BERNIE BLEGEN 1555 PALM BEACH LAKES BLVD. WEST PALM BEACH FL 33401	Common Stock	01/02/2026	3000	2821410.00
BERNIE BLEGEN 1555 PALM BEACH LAKES BLVD. WEST PALM BEACH FL 33401	Common Stock	02/02/2026	3000	3389280.00

144: Remarks and Signature

Remarks
Date of Notice	02/04/2026
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/ Theodore Bernhard Blegen
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)