Monolithic Power holder plans $41K stock sale

MONOLITHIC POWER SYSTEMS, INC.

Rhea-AI Filing Summary

MONOLITHIC POWER SYSTEMS, INC. (MPWR) is the issuer for a planned sale of common stock under Rule 144 by Robert Dean. The notice covers 32 shares of common stock to be sold through Morgan Stanley Smith Barney LLC, with an aggregate market value of $41,526.90 based on information as of August 24, 2026.

The securities to be sold are associated with time-based restricted stock units, with the acquisition date listed as August 22, 2026. The filing also lists prior sales of MPWR common stock by Robert Dean during the preceding three months.

Key Figures

Shares to be sold: 32 shares of common stock Aggregate market value of shares to be sold: $41,526.90 Shares outstanding: 49,111,306 shares +3 more

6 metrics

Shares to be sold 32 shares of common stock Planned Rule 144 sale covered by the notice

Aggregate market value of shares to be sold $41,526.90 Market value for 32 shares as of 08/24/2026

Shares outstanding 49,111,306 shares Common stock outstanding figure listed with securities information

Sale on 05/26/2026 22 shares for $35,882.23 Common stock sold by Robert Dean during prior three months

Sale on 08/05/2026 105 shares for $141,148.35 Common stock sold by Robert Dean during prior three months

Sale on 08/17/2026 6 shares for $8,128.45 Common stock sold by Robert Dean during prior three months

Key Terms

Rule 144, time-based restricted stock units, aggregate market value, Form 144

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

time-based restricted stock units financial

"Time-based restricted stock units | Issuer | | | 32 | 08/22/2026"

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.

aggregate market value financial

"Common Stock | ... | 32 | 41526.90 | 49111306 | 08/24/2026"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

Form 144 regulatory

"144: Securities To Be Sold"

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.

FAQ

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

What does the Form 144 filing disclose about MPWR?

The filing discloses a planned sale under Rule 144 of 32 shares of Monolithic Power Systems, Inc. (MPWR) common stock by Robert Dean, with an aggregate market value of $41,526.90, to be sold through Morgan Stanley Smith Barney LLC.

How many MPWR shares are planned to be sold under this Form 144?

The notice covers the proposed sale of 32 shares of Monolithic Power Systems, Inc. common stock. These shares are listed in the securities information section and are tied to time-based restricted stock units with an acquisition date of August 22, 2026.

What prior sales of MPWR stock does Robert Dean report in the last three months?

Robert Dean reports sales of MPWR common stock on three dates: 22 shares for $35,882.23 on May 26, 2026; 105 shares for $141,148.35 on August 5, 2026; and 6 shares for $8,128.45 on August 17, 2026.

What is the aggregate market value of the MPWR shares covered by this Form 144?

The aggregate market value of the 32 shares of Monolithic Power Systems, Inc. common stock covered by this Form 144 is listed as $41,526.90, based on information as of August 24, 2026.

What type of equity award is associated with the MPWR shares to be sold?

The shares to be sold are associated with time-based restricted stock units, with an acquisition date of August 22, 2026. The issuer is identified as Monolithic Power Systems, Inc., and the security type is common stock.

On which market is MPWR common stock listed according to this filing?

The filing identifies the market for the common stock as NASDAQ. The security type is common stock of Monolithic Power Systems, Inc. (MPWR), listed in the securities information section of the notice.

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

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Available on EDGAR 08/24/2026 - 08:17 PM EDT Accepted by SEC EDGAR 08/24/2026 - 08:17 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 FL 10004	32	41526.90	49111306	08/24/2026	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	08/22/2026	Time-based restricted stock units	Issuer			32	08/22/2026	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	05/26/2026	22	35882.23
Robert Dean 1555 PALM BEACH LAKES BLVD. 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	08/17/2026	6	8128.45

144: Remarks and Signature

Remarks
Date of Notice	08/24/2026
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)