MPWR CFO sells 21,725 shares to cover taxes

Monolithic Power Systems EVP and CFO Theodore Blegen sold 21,725 shares of common stock on February 6, 2026.

Rhea-AI Filing Summary

Monolithic Power Systems EVP and CFO Theodore Blegen sold 21,725 shares of common stock on February 6, 2026. The shares were sold at an average price of $1,171.1637 per share to cover taxes upon the release of restricted stock units under the company’s equity incentive plan.

After the sale, Blegen directly owned 82,353 shares of common stock and had indirect beneficial ownership of 5,331 shares in an irrevocable trust for Sarah N. Blegen and 5,331 shares in an irrevocable trust for Theodore F. Blegen.

Insider Trade Summary

Net Seller: 21,725 shares

Net Sell 3 txns

Insider BLEGEN THEODORE

Role EVP and CFO

Sold 21,725 shs ($25.44M)

Type	Security	Shares	Price	Value
Sale	Common Stock	21,725	$1,171.1637	$25.44M
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 82,353 shares (Direct); Common Stock — 5,331 shares (Indirect, Irrevocable Trust FBO Sarah N. Blegen); Common Stock — 5,331 shares (Indirect, Irrevocable Trust FBO Theodore F. Blegen)

Footnotes (1)

1. F1. The reported sales were to cover taxes upon the release of restricted stock units, as required by the Company's equity incentive plan.

FAQ

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

What insider transaction did MPWR’s CFO report on this Form 4?

MPWR’s CFO, Theodore Blegen, reported selling 21,725 shares of Monolithic Power Systems common stock. The transaction occurred on February 6, 2026 and involved shares sold primarily to satisfy tax obligations tied to restricted stock units.

At what price did MPWR’s CFO sell the 21,725 shares of common stock?

Theodore Blegen sold 21,725 shares at an average price of $1,171.1637 per share. This sale price reflects the transaction reported for February 6, 2026 and was used to generate cash to cover related tax liabilities.

Why did MPWR’s CFO sell 21,725 shares of company stock?

The filing states that the reported sales were to cover taxes upon the release of restricted stock units. These sales were required under Monolithic Power Systems’ equity incentive plan to satisfy associated tax withholding obligations.

How many MPWR shares does the CFO own directly after this transaction?

Following the reported sale, Theodore Blegen directly owned 82,353 shares of Monolithic Power Systems common stock. This figure reflects his remaining direct holdings after the 21,725 shares were sold on February 6, 2026.

What indirect holdings in MPWR stock are reported for the CFO?

The filing shows 5,331 shares held in an irrevocable trust for Sarah N. Blegen and 5,331 shares in an irrevocable trust for Theodore F. Blegen. Both positions are reported as indirect beneficial ownership interests.

What role does the reporting person hold at Monolithic Power Systems (MPWR)?

The reporting person, Theodore Blegen, serves as Executive Vice President and Chief Financial Officer of Monolithic Power Systems. His status as an officer requires reporting of transactions in company securities under Section 16 rules.

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

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Accepted by SEC EDGAR 02/10/2026 - 06:57 PM Learn about SEC filing dates

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).

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)

1555 PALM BEACH LAKES BLVD.

(Street)

WEST PALM BEACH FL 33401

(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)
02/06/2026

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	02/06/2026		S		21,725(1)	D	$1,171.1637	82,353	D
Common Stock								5,331	I	Irrevocable Trust FBO Sarah N. Blegen
Common Stock								5,331	I	Irrevocable Trust FBO Theodore F. 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:

1. The reported sales were to cover taxes upon the release of restricted stock units, as required by the Company's equity incentive plan.

Remarks:

	/s/ Saria Tseng, attorney-in-fact for Mr. Bernie Blegen	02/10/2026
	** 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.