At what prices did Elmiger’s MPWR share sales occur?

Elmiger’s reported sales occurred at weighted-average prices between about $1,559.88 and $1,600.14 per share across multiple trades. Footnotes explain each reported price as a weighted average over several executions within a narrow intraday range.

Monolithic Power Systems (MPWR) director sells 12,000 shares in open-market trades

Q: How many Monolithic Power Systems (MPWR) shares did Eugen J. Elmiger sell?

Director Eugen J. Elmiger sold a total of 12,000 shares of Monolithic Power Systems common stock. The filing aggregates nine separate open-market sale entries to this net amount, all occurring on May 6, 2026, according to the transaction summary data.

Q: What type of transactions did Eugen J. Elmiger report in this MPWR Form 4?

All reported transactions are open-market sales of Monolithic Power Systems common stock, coded “S” for sale. There are no option exercises, gifts, tax withholdings, or derivative transactions disclosed in this Form 4 excerpt.

Filing Impact

(Very High)

Filing Sentiment

(Very Negative)

Form Type

Rhea-AI Filing Summary

Monolithic Power Systems director Eugen J. Elmiger sold 12,000 shares of Common Stock in open-market transactions. The trades occurred on May 6, 2026 across multiple price levels, with individual line items showing sale prices between $1,559.88 and $1,600.14 per share. Following these sales, Elmiger directly holds 17,082 shares of Monolithic Power Systems common stock.

Insights

Director executes sizable open-market sale but retains a meaningful stake.

Director Eugen J. Elmiger reported a net open-market sale of 12,000 shares of Monolithic Power Systems common stock on May 6, 2026. All reported transactions used code S, indicating discretionary sales rather than option exercises or tax withholdings.

The trades were spread across several price points, with reported line-item prices from about $1,559.88 to $1,600.14 per share, and footnotes describe each as a weighted average sale price over multiple individual executions. After these transactions, Elmiger still directly owns 17,082 shares, so this represents a partial reduction rather than a full exit.

The filing shows no remaining derivative positions in the derivativeSummary, suggesting no options or similar instruments are reported here. The economic and governance impact will depend on Elmiger’s broader holdings and the company’s total share count, which are not detailed in this data; based on this excerpt alone, the event appears as a notable but not necessarily thesis-changing insider sale.

Insider Trade Summary

Net Seller: 12,000 shares ($19,019,482)

Net Sell 9 txns

Insider Elmiger Eugen J

Role null

Sold 12,000 shs ($19.02M)

Type	Security	Shares	Price	Value
Sale	Common Stock	320	$1,559.88	$499K
Sale	Common Stock	814	$1,566.36	$1.28M
Sale	Common Stock	1,078	$1,571.58	$1.69M
Sale	Common Stock	834	$1,575.57	$1.31M
Sale	Common Stock	1,879	$1,581.81	$2.97M
Sale	Common Stock	2,587	$1,586.81	$4.11M
Sale	Common Stock	1,355	$1,591.38	$2.16M
Sale	Common Stock	2,619	$1,596.42	$4.18M
Sale	Common Stock	514	$1,600.14	$822K

Holdings After Transaction: Common Stock — 17,082 shares (Direct, null)

Footnotes (1)

The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,557.08 to $1,561.97. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,563.39 to $1,568.28. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,568.78 to $1,573.40. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,573.86 to $1,578.73. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,578.85 to $1,583.66. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,583.79 to $1,588.65. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,588.80 to $1,593.63. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,593.95 to $1,598.78. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,598.99 to $1,602.68 The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

Key Figures

Shares sold: 12,000 shares Highest reported sale price: $1,600.14/share Lowest reported sale price: $1,559.88/share +3 more

6 metrics

Shares sold 12,000 shares Total common stock sold on May 6, 2026

Highest reported sale price $1,600.14/share Line-item sale price on May 6, 2026

Lowest reported sale price $1,559.88/share Line-item sale price on May 6, 2026

Shares held after transactions 17,082 shares Director’s direct holdings following sales

Transaction code S (Sale) Open-market or private sale of common stock

Net buy/sell direction Net-sell of 12,000 shares Transaction summary for this Form 4

Key Terms

open-market sale, weighted average sale price, Common Stock, transaction code S, +1 more

5 terms

open-market sale financial

"transaction_action: "open-market sale" for each Common Stock transaction"

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.

weighted average sale price financial

"The price is the weighted average sale price for the transactions reported on this line."

Common Stock financial

"security_title: "Common Stock" for all reported transactions"

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.

transaction code S regulatory

"transaction_code: "S" and description "Sale in open market or private transaction""

Form 4 regulatory

"INSIDER FILING DATA (Form 4): { "issuerName": "MONOLITHIC POWER SYSTEMS INC""

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 →

05/08/2026 - 07:37 PM

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^*

Elmiger Eugen J

(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)
05/06/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/06/2026		S		320	D	$1,559.88⁽¹⁾	17,082	D
Common Stock	05/06/2026		S		814	D	$1,566.36⁽²⁾	16,268	D
Common Stock	05/06/2026		S		1,078	D	$1,571.58⁽³⁾	15,190	D
Common Stock	05/06/2026		S		834	D	$1,575.57⁽⁴⁾	14,356	D
Common Stock	05/06/2026		S		1,879	D	$1,581.81⁽⁵⁾	12,477	D
Common Stock	05/06/2026		S		2,587	D	$1,586.81⁽⁶⁾	9,890	D
Common Stock	05/06/2026		S		1,355	D	$1,591.38⁽⁷⁾	8,535	D
Common Stock	05/06/2026		S		2,619	D	$1,596.42⁽⁸⁾	5,916	D
Common Stock	05/06/2026		S		514	D	$1,600.14⁽⁹⁾	5,402	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,557.08 to $1,561.97. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

2. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,563.39 to $1,568.28. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

3. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,568.78 to $1,573.40. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

4. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,573.86 to $1,578.73. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

5. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,578.85 to $1,583.66. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

6. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,583.79 to $1,588.65. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

7. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,588.80 to $1,593.63. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

8. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,593.95 to $1,598.78. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

9. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,598.99 to $1,602.68 The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

Remarks:

	/s/ Saria Tseng, attorney-in-fact for Mr. Eugen J. Elmiger	05/08/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

How many Monolithic Power Systems (MPWR) shares did Eugen J. Elmiger sell?

Director Eugen J. Elmiger sold a total of 12,000 shares of Monolithic Power Systems common stock. The filing aggregates nine separate open-market sale entries to this net amount, all occurring on May 6, 2026, according to the transaction summary data.

What type of transactions did Eugen J. Elmiger report in this MPWR Form 4?

All reported transactions are open-market sales of Monolithic Power Systems common stock, coded “S” for sale. There are no option exercises, gifts, tax withholdings, or derivative transactions disclosed in this Form 4 excerpt.

How many MPWR shares does Elmiger hold after these sales?

After the reported transactions, Eugen J. Elmiger directly holds 17,082 shares of Monolithic Power Systems common stock. This figure comes from the post-transaction share balance on the final reported sale line in the filing data.

Does this MPWR Form 4 show any remaining stock options or derivatives for Elmiger?

The derivativeSummary section in this Form 4 is empty, indicating no remaining derivative positions such as stock options or warrants are reported for Elmiger in this filing. Only non-derivative common stock transactions are listed in the provided data.

Were Elmiger’s MPWR stock sales under a Rule 10b5-1 trading plan?

The provided footnotes describe weighted-average pricing ranges for the sales but do not mention any Rule 10b5-1 trading plan. Based on this excerpt alone, there is no indication in the text that the transactions were pre-planned under such a program.