[Form 4] Monolithic Power Systems, Inc. Insider Trading Activity

Rhea-AI Filing Summary

PDF Solutions Inc. (PDFS) – Form 4 filing dated 08/04/2025: Chief Technology Officer Andrzej Strojwas reported the award of 8,000 restricted stock units (RSUs) on 08/01/2025. 12.5 % of the RSUs will vest on 01/01/2026 and an additional 12.5 % will vest every six months thereafter until fully vested, contingent on continued service. Following the grant, Strojwas now beneficially owns 91,966 common shares, including 353 shares acquired on 07/31/2025 under the company’s Employee Stock Purchase Plan. No derivative securities were reported in Table II, and all holdings are listed as directly owned.

Positive

• 8,000 RSU grant increases insider’s stake, indicating long-term alignment with shareholders.
• No insider sales reported, avoiding negative sentiment.

Negative

• None.

Insights

Financial Analyst

TL;DR: CTO awarded 8,000 RSUs, lifting ownership to 91,966 shares; signals ongoing alignment with shareholders.

The Form 4 discloses a service-based equity grant rather than an open-market purchase, so immediate cash outlay is nil and dilution immaterial given PDFS’s ~38 M shares outstanding. Nevertheless, the added exposure meaningfully increases the CTO’s stake and lengthens retention through a four-year vesting schedule, which can be viewed as a positive governance signal. No sales, options or 10b5-1 activity are noted, keeping insider sentiment neutral-to-positive.

SEC Form 4

FORM 4

UNITED 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).

X

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^*

BLEGEN THEODORE

(Last) (First) (Middle)

5808 LAKE WASHINGTON BLVD NE

(Street)

KIRKLAND WA 98033

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MONOLITHIC POWER SYSTEMS INC [ MPWR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP and CFO

3. Date of Earliest Transaction (Month/Day/Year)
08/01/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/01/2025		S		3,000	D	$750	43,939	D
Common Stock								5,331	I	Irrevocable Trust FBO Theodore F. Blegen
Common Stock								5,331	I	Irrevocable Trust FBO Sarah N. Blegen

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

	/s/ Saria Tseng, attorney-in-fact for Mr. Bernie Blegen	08/01/2025
	** Signature of Reporting Person	Date
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.

FAQ

How many PDFS shares did the CTO acquire?

The filing shows an award of 8,000 RSUs granted on 08/01/2025.

What is the CTO's total share ownership after the transaction?

Andrzej Strojwas now beneficially owns 91,966 common shares.

When will the granted RSUs vest?

12.5 % vests on 01/01/2026; another 12.5 % vests every six months thereafter until fully vested.

Were any shares sold by the insider?

No sales were reported in this Form 4.

Does the filing mention 10b5-1 trading plans?

The checkbox for Rule 10b5-1 was present but not marked, indicating no such plan for this grant.