Insider trading · Q3 2026 · CIK 1280452

Monolithic Power Systems, Inc. (MPWR) insider trading.

Name: Monolithic Power Systems, Inc. insider transactions, Q3 2026
Creator: U.S. Securities and Exchange Commission

In Q3 2026, insiders at Monolithic Power Systems, Inc. reported 39 non-derivative transactions on 12 Forms 3, 4 and 5: 0 open-market purchases and 33 sales worth $61.0M.

Transactions: 39
Purchases (P): 0
Sales (S): 33
Net shares, P minus S: -45,303
Insiders: 5
Last filed: 2026-09-30

Insiders

Insider	Relationship	Transactions	Sales
Sciammas Maurice	Officer · EVP, WW Sales & Marketing	22	20
Hsing Michael	Director, Officer · CEO	8	8
Dean Robert W II	Officer · Interim CFO	5	3
Tseng Saria	Officer · EVP & General Counsel	2	0
Chang Kuo Wei Herbert	Director	2	2

Transactions

39 non-derivative rows, newest transaction first. Shares and prices as filed.
Date	Insider	Code	Shares	Price	Owned after	Filing
2026-09-28	Hsing Michael	S (D)	596	$1,323.31	847,668	Form 4
2026-09-28	Hsing Michael	S (D)	2,121	$1,328.54	845,547	Form 4
2026-09-28	Hsing Michael	S (D)	1,111	$1,333.34	844,436	Form 4
2026-09-28	Hsing Michael	S (D)	130	$1,356.94	818,264	Form 4
2026-09-28	Hsing Michael	S (D)	5,783	$1,343.76	835,704	Form 4
2026-09-28	Hsing Michael	S (D)	6,343	$1,347.15	829,361	Form 4
2026-09-28	Hsing Michael	S (D)	10,967	$1,351.43	818,394	Form 4
2026-09-28	Hsing Michael	S (D)	2,949	$1,338.66	841,487	Form 4
2026-08-31	Tseng Saria	G (D)	2,000	$0	142,218	Form 4
2026-08-31	Tseng Saria	G (A)	2,000	$0	2,000	Form 4
2026-08-24	Dean Robert W II	S (D)	32	$1,297.72	7,094	Form 4
2026-08-24	Dean Robert W II	J (D)	5	$0	7,089	Form 4
2026-08-24	Chang Kuo Wei Herbert	S (D)	50	$1,281.57	515	Form 4
2026-08-17	Dean Robert W II	S (D)	6	$1,413.64	7,126	Form 4
2026-08-11	Chang Kuo Wei Herbert	S (D)	50	$1,420	565	Form 4
2026-08-05	Dean Robert W II	S (D)	105	$1,344.27	7,132	Form 4
2026-08-04	Sciammas Maurice	G (A)	25,000	$0	36,062	Form 4
2026-08-04	Sciammas Maurice	G (D)	25,000	$0	126,644	Form 4
2026-08-03	Sciammas Maurice	S (D)	30	$1,343.94	1,119	Form 4
2026-07-25	Dean Robert W II	A (A)	1,359	$0	7,237	Form 4
2026-07-15	Sciammas Maurice	S (D)	240	$1,369.18	153,434	Form 4
2026-07-15	Sciammas Maurice	S (D)	472	$1,375.47	152,962	Form 4
2026-07-15	Sciammas Maurice	S (D)	418	$1,378.73	152,544	Form 4
2026-07-15	Sciammas Maurice	S (D)	410	$1,384.11	152,134	Form 4
2026-07-15	Sciammas Maurice	S (D)	1,864	$1,344.16	160,870	Form 4
2026-07-15	Sciammas Maurice	S (D)	213	$1,396.16	151,871	Form 4
2026-07-15	Sciammas Maurice	S (D)	117	$1,400.45	151,754	Form 4
2026-07-15	Sciammas Maurice	S (D)	110	$1,405.71	151,644	Form 4
2026-07-15	Sciammas Maurice	S (D)	527	$1,314.03	166,117	Form 4
2026-07-15	Sciammas Maurice	S (D)	274	$1,318.42	165,843	Form 4
2026-07-15	Sciammas Maurice	S (D)	409	$1,323.93	165,434	Form 4
2026-07-15	Sciammas Maurice	S (D)	464	$1,329.3	164,970	Form 4
2026-07-15	Sciammas Maurice	S (D)	776	$1,334.59	164,194	Form 4
2026-07-15	Sciammas Maurice	S (D)	1,460	$1,339.59	162,734	Form 4
2026-07-15	Sciammas Maurice	S (D)	50	$1,359.36	153,674	Form 4
2026-07-15	Sciammas Maurice	S (D)	5,640	$1,352.95	153,724	Form 4
2026-07-15	Sciammas Maurice	S (D)	1,506	$1,348.91	159,364	Form 4
2026-07-15	Sciammas Maurice	S (D)	50	$1,388.19	152,084	Form 4
2026-07-01	Sciammas Maurice	S (D)	30	$1,351.61	1,149	Form 4

Transaction codes in this quarter

S: 33 G: 4 J: 1 A: 1

Get MPWR insider transactions through the API

Request with your API key

curl "https://sec-api.dev/api/v1/insider-transactions?period=2026q3&cik=1280452&limit=100" \
  -H "Authorization: Bearer $SEC_API_KEY"

Insider trading API guide · MPWR company page · Monolithic Power Systems, Inc. on SEC.gov

Questions

Are insiders buying or selling Monolithic Power Systems, Inc. (MPWR)?

In Q3 2026, insiders at Monolithic Power Systems, Inc. reported 39 non-derivative transactions on 12 Forms 3, 4 and 5: 0 open-market purchases and 33 sales worth $61.0M. Grants, tax withholding and option exercises are counted as transactions but are not purchases or sales.

Where do these Monolithic Power Systems, Inc. insider trades come from?

From the SEC Insider Transactions Data Sets for Q3 2026, which republish the Forms 3, 4 and 5 filed on EDGAR. Each row links to its filing on SEC.gov.

Source: SEC Insider Transactions Data Sets, Q3 2026, retrieved 2026-10-27. Footnotes, derivative holdings and amendments are in the linked filings. Not investment advice.

Plain-text version for agents and LLMs: /insider-trading/mpwr.md

Independent. Not affiliated with, endorsed by, or sponsored by the U.S. Securities and Exchange Commission. Data is reproduced from public SEC filings and datasets. Not investment advice.