Monolithic Power (NASDAQ: MPWR) director sells 1,514 shares in May trades

Rhea-AI Filing Summary

MONOLITHIC POWER SYSTEMS INC director Jeff Zhou sold 1,514 shares of Common Stock in open-market transactions. The sales occurred on May 5 and May 6, 2026, at prices between $1,574.48 and $1,650.00 per share. After these transactions, Zhou directly holds 4,286 shares of Monolithic Power Systems common stock.

Insider Trade Summary

Net Seller: 1,514 shares ($2,434,283)

Net Sell 3 txns

Insider Zhou Jeff

Role null

Sold 1,514 shs ($2.43M)

Type	Security	Shares	Price	Value
Sale	Common Stock	500	$1,650.00	$825K
Sale	Common Stock	514	$1,574.48	$809K
Sale	Common Stock	500	$1,600.00	$800K

Holdings After Transaction: Common Stock — 4,286 shares (Direct, null)

Footnotes (1)

Key Figures

Total shares sold: 1,514 shares Sale price May 6, 2026: $1,650.00 per share Sale prices May 5, 2026: $1,600.00 and $1,574.48 per share +1 more

4 metrics

Total shares sold 1,514 shares Open-market sales on May 5–6, 2026

Sale price May 6, 2026 $1,650.00 per share 500 shares of Common Stock sold

Sale prices May 5, 2026 $1,600.00 and $1,574.48 per share Two sales totaling 1,014 shares

Shares after transactions 4,286 shares Direct ownership following the last reported sale

Key Terms

Common Stock, open-market sale, Form 4

3 terms

Common Stock financial

"security_title: Common Stock"

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.

open-market sale financial

"transaction_action: open-market sale"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Form 4 Insider Transactions: What Each Field Means →

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^*

Zhou Jeff

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/05/2026

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

X	Form 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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/05/2026		S		514	D	$1,574.48	5,286	D
Common Stock	05/05/2026		S		500	D	$1,600	4,786	D
Common Stock	05/06/2026		S		500	D	$1,650	4,286	D

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. Jeff Zhou	05/06/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What did Jeff Zhou report in his latest Form 4 for MPWR?

Jeff Zhou reported open-market sales of 1,514 shares of MONOLITHIC POWER SYSTEMS INC Common Stock. The transactions occurred on May 5–6, 2026, and were executed at prices ranging from $1,574.48 to $1,650.00 per share.

How many Monolithic Power (MPWR) shares did Jeff Zhou sell and at what prices?

Jeff Zhou sold a total of 1,514 MPWR shares in three open-market transactions. The reported sale prices were $1,574.48, $1,600.00, and $1,650.00 per share, as disclosed in the Form 4 insider trading report.

On what dates did Jeff Zhou’s MPWR share sales take place?

Jeff Zhou’s reported MPWR share sales occurred on May 5, 2026, and May 6, 2026. Two transactions took place on May 5 and one on May 6, all classified as open-market sales of Monolithic Power Systems common stock.

How many MPWR shares does Jeff Zhou hold after these transactions?

Following the reported sales, Jeff Zhou directly holds 4,286 shares of MONOLITHIC POWER SYSTEMS INC Common Stock. This post-transaction ownership figure is taken from the Form 4 and reflects his remaining direct stake after the May 2026 sales.

What type of transactions were reported in Jeff Zhou’s MPWR Form 4?

All reported transactions were non-derivative, open-market sales of MPWR Common Stock, coded as “S” on Form 4. The filing classifies them as sales in the open market or private transactions, with no derivative exercises reported in this instance.