Monolithic Power insider plans sale of 6 shares

Rhea-AI Filing Summary

Monolithic Power Systems (symbol MPWR) insider Robert Dean filed a notice of proposed sale of 6 shares of common stock through Morgan Stanley Smith Barney LLC Executive Financial Services, with a referenced value of 8128.45 and an anticipated sale date of 08/17/2026 on NASDAQ. The filing also notes time-based restricted stock units related to 6 shares, dated 08/15/2026, issued by the company. Over the prior three months, Dean reported additional sales of 105, 22, and 4 shares of common stock on 08/05/2026, 05/26/2026, and 05/18/2026, respectively, with corresponding transaction values of 141148.35, 35882.23, and 6253.12.

Key Figures

Proposed shares to be sold: 6 shares Referenced value for proposed sale: 8128.45 Proposed sale date: 08/17/2026 +5 more

8 metrics

Proposed shares to be sold 6 shares Common stock listed for proposed sale via Morgan Stanley Smith Barney LLC

Referenced value for proposed sale 8128.45 Value associated with 6 shares of common stock proposed for sale

Proposed sale date 08/17/2026 Anticipated sale date for 6 shares on NASDAQ

Restricted stock units 6 units Time-based restricted stock units dated 08/15/2026 issued by the issuer

Shares sold 08/05/2026 105 shares Common stock sale during the past 3 months with value 141148.35

Value of 08/05/2026 sale 141148.35 Transaction value for 105 shares sold on 08/05/2026

Shares sold 05/26/2026 22 shares Common stock sale with value 35882.23 during the past 3 months

Shares sold 05/18/2026 4 shares Common stock sale with value 6253.12 during the past 3 months

Key Terms

Time-based restricted stock units, Executive Financial Services, Securities Sold During The Past 3 Months

3 terms

Time-based restricted stock units financial

"Common Stock | 08/15/2026 | Time-based restricted stock units | Issuer"

Time-based restricted stock units are a form of employee compensation where individuals are granted company shares that are earned over a set period, often as a reward for staying with the company. These shares typically become fully owned and transferable only after passing specific time milestones, encouraging long-term commitment. For investors, they highlight a company's focus on employee retention and can influence future stock supply and company stability.

Executive Financial Services financial

"Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza"

Securities Sold During The Past 3 Months regulatory

"144: Securities Sold During The Past 3 Months"

FAQ

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

What does the MPWR Form 144 filed by Robert Dean disclose?

The Form 144 discloses that Robert Dean plans to sell 6 shares of MPWR common stock through Morgan Stanley Smith Barney LLC on or about 08/17/2026. It also lists prior common stock sales during the preceding three months with related share counts and values.

How many MPWR shares is Robert Dean proposing to sell in this Form 144?

Robert Dean is proposing to sell 6 shares of MPWR common stock. The proposed sale is through Morgan Stanley Smith Barney LLC Executive Financial Services, with the filing referencing a value of 8128.45 and an intended sale date of 08/17/2026 on NASDAQ.

What MPWR-related restricted stock units are mentioned in Robert Dean’s Form 144?

The filing mentions time-based restricted stock units for 6 shares of MPWR common stock dated 08/15/2026. These units are identified as being issued by the Issuer, linking them to Monolithic Power Systems as part of equity-based compensation.

What MPWR stock sales has Robert Dean made in the last three months?

Over the prior three months, Dean reported MPWR common stock sales of 105 shares on 08/05/2026, 22 shares on 05/26/2026, and 4 shares on 05/18/2026. The corresponding transaction values were 141148.35, 35882.23, and 6253.12, respectively.

Which broker is handling Robert Dean’s proposed MPWR share sale in this Form 144?

The proposed transaction is listed through Morgan Stanley Smith Barney LLC Executive Financial Services. The address is given as 1 New York Plaza, 8th Floor, New York, NY 10004, and the filing associates this broker with the planned sale of 6 MPWR shares.

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

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Accepted by SEC EDGAR 08/17/2026 - 06:34 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	0001445300
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	DEAN ROBERT W II
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 NY 10004	6	8128.45	49104390	08/17/2026	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	08/15/2026	Time-based restricted stock units	Issuer			6	08/15/2026	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
Robert Dean 1555 PALM BEACH LAKESBLVD. WEST PALM BEACH FL 98033	Common Stock	08/05/2026	105	141148.35
Robert Dean 1555 PALM BEACH LAKESBLVD. WEST PALM BEACH FL 98033	Common Stock	05/26/2026	22	35882.23
Robert Dean 1555 PALM BEACH LAKES BLVD. WEST PALM BEACH FL 98033	Common Stock	05/18/2026	4	6253.12

144: Remarks and Signature

Remarks
Date of Notice	08/17/2026
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/ Robert Dean
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)