STOCK TITAN

Monolithic Power (NASDAQ: MPWR) interim CFO reports 105-share insider sale

(Moderate)
(Negative)
Form Type
4

Rhea-AI Filing Summary

Monolithic Power Systems, Inc. reports that Interim CFO Robert W. Dean II sold 105 shares of Common Stock on 2026-08-05 at $1,344.27 per share in an open market or private transaction. After this sale, he holds 7,132 shares directly and 65 shares indirectly, held by Parent & Daughter.

Positive

  • None.

Negative

  • None.
Insider DEAN ROBERT W II
Role Interim CFO
Sold 105 shs ($141K)
Type Security Shares Price Value
Sale Common Stock 105 $1,344.27 $141K
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 7,132 shares (Direct); Common Stock — 65 shares (Indirect, Held by Parent & Daughter)
Shares sold 105 shares Common Stock sale on 2026-08-05
Sale price $1,344.27 per share Price for 105 shares of Common Stock sold
Direct holdings after sale 7,132 shares Direct ownership position following the reported transaction
Indirect holdings after sale 65 shares Indirect ownership described as Held by Parent & Daughter
Net buy/sell direction -105 shares Net shares sold across reported non-derivative transactions
Common Stock financial
"Security title reported as Common Stock for the insider transaction."
Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.
Interim CFO financial
"Reporting person Robert W. Dean II is listed as Interim CFO."
An interim CFO is a temporary chief financial officer hired to run a company’s finance operations during a leadership transition, a search for a permanent hire, or while specific financial issues are resolved. Investors pay attention because this person manages budgeting, financial reporting and communications with shareholders—like a substitute driver keeping a car on course—so their competence affects short‑term financial stability, the accuracy of public reports, and market confidence.
Sale in open market or private transaction regulatory
"Transaction code description notes a Sale in open market or private transaction."
Held by Parent & Daughter financial
"Nature of ownership for 65 indirectly owned shares is Held by Parent & Daughter."

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

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FAQ

What insider transaction did MPWR's interim CFO report?

Interim CFO Robert W. Dean II reported selling 105 shares of Monolithic Power Systems (MPWR) Common Stock on 2026-08-05. After the transaction, he holds 7,132 shares directly and 65 shares indirectly, which are held by Parent & Daughter.

At what price did the MPWR shares sell in this insider trade?

The reported sale of MPWR shares occurred at a price of $1,344.27 per share. This price applies to the 105 shares of Common Stock sold on 2026-08-05 in an open market or private transaction.

How many MPWR shares does the interim CFO hold after this Form 4?

After the reported sale, the interim CFO holds 7,132 MPWR shares directly. In addition, he has 65 shares reported as indirectly owned, described as Held by Parent & Daughter in the ownership information.

Is the MPWR insider’s remaining stake held directly or indirectly?

Most of the interim CFO’s stake in MPWR is held directly, totaling 7,132 shares. A smaller portion, 65 shares, is reported as indirect ownership and is described as held by Parent & Daughter.

Does the MPWR Form 4 indicate use of a Rule 10b5-1 trading plan?

The Form 4’s Rule 10b5-1 checkbox is not marked as affirming a trading plan. The sale is characterized simply as a Sale in open market or private transaction, with no trading-plan detail in the reported data.

What type of security was involved in the MPWR insider sale?

The transaction involved Common Stock of Monolithic Power Systems (MPWR). The interim CFO sold 105 shares of this Common Stock at $1,344.27 per share, and his post-transaction holdings are reported in shares of the same security.
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
DEAN ROBERT W II

(Last)(First)(Middle)
1555 PALM BEACH LAKES BLVD.

(Street)
WEST PALM BEACH FLORIDA 33401

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
MONOLITHIC POWER SYSTEMS, INC. [ MPWR ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Interim CFO
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/05/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock08/05/2026S105D$1,344.277,132D
Common Stock65IHeld by Parent & Daughter
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
Remarks:
/s/ Saria Tseng, attorney-in-fact for Mr. Robert W. Dean II08/06/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)