Monolithic Power Systems Ownership & Insider Activity

Monolithic Power Systems (MPWR) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 3.8% of shares outstanding. Institutional investors hold 76.6%. Over the past 90 days, insiders made 8 sales worth $61.0M.

Shares Outstanding

48.780M

Shares Float

36.291M

Insider Shares Owned

1.885M

Insider % Owned

3.8%

Institutional Shares Held

37.627M

Institutional % Held

76.6%

Ownership Breakdown

Net Insider Activity by Month

Purchases (90d)

Sales (90d)

$61.0M total

Net Activity

Net Selling

Net Value (90d)

-$61.0M

Monolithic Power Systems Insider Transactions (Last 6 Months)

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Date	Insider	Title	Type	Shares	Price	Value
Sep 28, 2026	Michael Hsing	CEO	SELL	30.000K	$1344.97	$40.3M
Aug 24, 2026	ROBERT DEAN II	INTERIM CFO	SELL	37.000	$1297.72	$42K
Aug 24, 2026	HERBERT WEI KUO CHANG	—	SELL	50.000	$1281.57	$64K
Aug 17, 2026	ROBERT DEAN II	INTERIM CFO	SELL	6.000	$1413.64	$8K
Aug 11, 2026	HERBERT WEI KUO CHANG	—	SELL	50.000	$1420.00	$71K
Aug 5, 2026	ROBERT DEAN II	INTERIM CFO	SELL	105.000	$1344.27	$141K
Aug 3, 2026	Maurice Sciammas	EVP, WW SALES & MARKETING	SELL	30.000	$1343.94	$40K
Jul 15, 2026	Maurice Sciammas	EVP, WW SALES & MARKETING	SELL	15.000K	$1349.73	$20.2M
Jul 1, 2026	Maurice Sciammas	EVP, WW SALES & MARKETING	SELL	30.000	$1351.61	$41K
Jun 1, 2026	Maurice Sciammas	EVP, WW SALES & MARKETING	SELL	30.000	$1533.95	$46K
May 27, 2026	Saria Tseng	EVP & GENERAL COUNSEL	SELL	7.565K	$1700.00	$12.9M
May 26, 2026	ROBERT DEAN II	INTERIM CFO	SELL	22.000	$1649.56	$36K
May 26, 2026	Jeff Zhou	—	SELL	486.000	$1680.00	$816K
May 22, 2026	Saria Tseng	EVP & GENERAL COUNSEL	SELL	5.200K	$1586.43	$7.9M
May 18, 2026	Michael Hsing	CEO	SELL	40.000K	$1482.75	$59.3M
May 18, 2026	ROBERT DEAN II	INTERIM CFO	SELL	4.000	$1563.28	$6K
May 15, 2026	Maurice Sciammas	EVP, WW SALES & MARKETING	SELL	12.000K	$1561.40	$18.7M
May 6, 2026	Eugen J Elmiger	—	SELL	12.000K	$1584.96	$19.0M
May 6, 2026	Deming Xiao	EVP, GLOBAL OPERATIONS	SELL	30.000K	$1654.55	$49.6M
May 6, 2026	Eileen Wynne	—	SELL	335.000	$1582.68	$530K
May 5, 2026	Jeff Zhou	—	SELL	1.514K	$1607.85	$2.4M
May 5, 2026	Maurice Sciammas	EVP, WW SALES & MARKETING	SELL	380.000	$1583.81	$602K
May 4, 2026	Maurice Sciammas	EVP, WW SALES & MARKETING	SELL	30.000	$1588.73	$48K
Apr 8, 2026	Saria Tseng	EVP & GENERAL COUNSEL	SELL	8.963K	$1305.22	$11.7M
Apr 6, 2026	Saria Tseng	EVP & GENERAL COUNSEL	SELL	7.636K	$1167.95	$8.9M

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Congressional Trading Activity

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Date	Member	Party	Chamber	Action	Amount
Jun 5, 2026	Byron Donalds	R	House	Sale (Partial)	$1,001 - $15,000
Jun 5, 2026	Byron Donalds	R	House	Sale (Partial)	$1,001 - $15,000
Feb 4, 2026	Markwayne Mullin	R	Senate	Purchase	$15,001 - $50,000
Jan 5, 2026	Markwayne Mullin	R	Senate	Purchase	$15,001 - $50,000
Jan 5, 2026	Markwayne Mullin	R	Senate	Purchase	$15,001 - $50,000
Oct 20, 2025	Michael Guest	R	House	Purchase	$1,001 - $15,000
Apr 8, 2025	Robert Bresnahan	R	House	Purchase	$1,001 - $15,000
Jan 13, 2025	Robert Bresnahan	R	House	Sale	$1,001 - $15,000
May 3, 2024	Tommy Tuberville	R	Senate	Sale	$1,001 - $15,000
May 3, 2024	Tommy Tuberville	R	Senate	Sale	$1,001 - $15,000
Oct 17, 2023	Tommy Tuberville	R	Senate	Purchase	$1,001 - $15,000

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