Monolithic Power Systems, Inc. Insider Trading

MPWR

Last 12 months

Insiders sold $725M and bought nothing on the open market.

35% of the selling was scheduled in advance under 10b5-1 plans. CEO Michael Hsing sold $64.3M on Feb 6 outside a plan. No executive or director has bought shares on the open market in the last two years.

Net open-market

−$725M

0 buys · 54 sales

Under a 10b5-1 plan

35%

of the value sold

Insiders who bought / sold

0 / 11

executives and directors

Last open-market buy

None

in the last two years

Get an email when MPWR's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Sep 28	Michael Hsing CEO	Sold10b5-1 plan 8 parts	30,000	$1,344.97 average	$40.3M	3.0%	Form 4
Aug 24	Robert W Dean II Interim CFO	SoldNo plan	32	$1,297.72	42K	0.4%	Form 4
Aug 24	Kuo Wei Herbert Chang Director	SoldNo plan	50	$1,281.57	64K	8.8%	Form 4
Aug 17	Robert W Dean II Interim CFO	SoldNo plan	6	$1,413.64	8K	<0.1%	Form 4
Aug 11	Kuo Wei Herbert Chang Director	SoldNo plan	50	$1,420.00	71K	8.1%	Form 4
Aug 5	Robert W Dean II Interim CFO	SoldNo plan	105	$1,344.27	141K	1.4%	Form 4
Aug 3	Maurice Sciammas EVP, WW Sales & Marketing	Sold10b5-1 plan	30	$1,343.94	40K	<0.1%	Form 4
Jul 15	Maurice Sciammas EVP, WW Sales & Marketing	Sold10b5-1 plan 18 parts	15,000	$1,349.73 average	$20.2M	6.0%	Form 4
Jul 1	Maurice Sciammas EVP, WW Sales & Marketing	Sold10b5-1 plan	30	$1,351.61	41K	<0.1%	Form 4
Jun 1	Maurice Sciammas EVP, WW Sales & Marketing	Sold10b5-1 plan	30	$1,533.95	46K	<0.1%	Form 4
May 27	Saria Tseng EVP & General Counsel	SoldNo plan	7,565	$1,700.00	$12.9M	5.0%	Form 4
May 26	Robert W Dean II Interim CFO	SoldNo plan	22	$1,649.56	36K	0.4%	Form 4
May 26	Jeff Zhou Director	SoldNo plan	486	$1,680.00	816K	11%	Form 4
May 22	Saria Tseng EVP & General Counsel	SoldNo plan	5,000	$1,586.43	$7.93M	3.2%	Form 4
May 18	Michael Hsing CEO	SoldNo plan 13 parts	40,000	$1,482.75 average	$59.3M	3.9%	Form 4
May 18	Robert W Dean II Interim CFO	SoldNo plan	4	$1,563.28	6K	<0.1%	Form 4
May 15	Maurice Sciammas EVP, WW Sales & Marketing	Sold10b5-1 plan 8 parts	12,000	$1,561.40 average	$18.7M	4.4%	Form 4
May 6	Eugen J Elmiger Director	SoldNo plan 9 parts	12,000	$1,584.96 average	$19M	69%	Form 4
May 6	Deming Xiao EVP, Global Operations	SoldNo plan 4 parts	30,000	$1,654.55 average	$49.6M	12%	Form 4
May 6	Eileen Wynne Director	SoldNo plan	335	$1,582.68	530K	25%	Form 4
May 5 – 6	Jeff Zhou Director	SoldNo plan 3 parts	1,514	$1,607.85 average	$2.43M	26%	Form 4
May 5	Maurice Sciammas EVP, WW Sales & Marketing	SoldNo plan	380	$1,583.81	602K	0.1%	Form 4
May 4	Maurice Sciammas EVP, WW Sales & Marketing	Sold10b5-1 plan	30	$1,588.73	48K	<0.1%	Form 4
Apr 8	Saria Tseng EVP & General Counsel	Sold10b5-1 plan 10 parts	8,963	$1,305.22 average	$11.7M	5.4%	Form 4
Apr 6	Saria Tseng EVP & General Counsel	Sold10b5-1 plan 8 parts	7,636	$1,167.95 average	$8.92M	4.4%	Form 4
Apr 1	Saria Tseng EVP & General Counsel	Sold10b5-1 plan 5 parts	1,400	$1,133.52 average	$1.59M	0.8%	Form 4
Apr 1	Maurice Sciammas EVP, WW Sales & Marketing	Sold10b5-1 plan	30	$1,116.44	33K	<0.1%	Form 4
Mar 30	Saria Tseng EVP & General Counsel	Sold10b5-1 plan 8 parts	25,674	$1,010.50 average	$25.9M	13%	Form 4
Mar 20	Maurice Sciammas EVP, WW Sales & Marketing	Sold10b5-1 plan	30	$1,095.07	33K	<0.1%	Form 4
Feb 12	Michael Hsing CEO	Sold10b5-1 plan 12 parts	33,000	$1,171.83 average	$38.7M	3.1%	Form 4
Feb 11	Michael Hsing CEO	Sold10b5-1 plan 10 parts	33,000	$1,188.92 average	$39.2M	3.0%	Form 4
Feb 11	Maurice Sciammas EVP, WW Sales & Marketing	SoldNo plan	200	$1,179.98	236K	<0.1%	Form 4
Feb 10	Michael Hsing CEO	Sold10b5-1 plan 9 parts	34,000	$1,142.28 average	$38.8M	3.0%	Form 4
Feb 9	Victor K Lee Director	Sold10b5-1 plan	400	$1,212.16	485K	1.4%	Form 4
Feb 6	Deming Xiao EVP, Global Operations	SoldNo plan	22,875	$1,171.16	$26.8M	8.1%	Form 4
Feb 6	Saria Tseng EVP & General Counsel	SoldNo plan	22,875	$1,171.16	$26.8M	10%	Form 4
Feb 6	Maurice Sciammas EVP, WW Sales & Marketing	SoldNo plan	22,875	$1,171.16	$26.8M	7.7%	Form 4
Feb 6	Theodore Blegen EVP and CFO	SoldNo plan	21,725	$1,171.16	$25.4M	19%	Form 4
Feb 6	Michael Hsing CEO	SoldNo plan	54,923	$1,171.16	$64.3M	4.6%	Form 4
Feb 2	Theodore Blegen EVP and CFO	Sold10b5-1 plan 17 parts	3,000	$1,129.76 average	$3.39M	3.8%	Form 4

Sep 2810b5-1 plan
Michael Hsing
CEO · sold 30,000 at avg $1,344.97
$40.3M
3.0% of stake
Aug 24No plan
Robert W Dean II
Interim CFO · sold 32 at $1,297.72
42K
0.4% of stake
Aug 24No plan
Kuo Wei Herbert Chang
Director · sold 50 at $1,281.57
64K
8.8% of stake
Aug 17No plan
Robert W Dean II
Interim CFO · sold 6 at $1,413.64
8K
<0.1% of stake
Aug 11No plan
Kuo Wei Herbert Chang
Director · sold 50 at $1,420.00
71K
8.1% of stake
Aug 5No plan
Robert W Dean II
Interim CFO · sold 105 at $1,344.27
141K
1.4% of stake
Aug 310b5-1 plan
Maurice Sciammas
EVP, WW Sales & Marketing · sold 30 at $1,343.94
40K
<0.1% of stake
Jul 1510b5-1 plan
Maurice Sciammas
EVP, WW Sales & Marketing · sold 15,000 at avg $1,349.73
$20.2M
6.0% of stake
Jul 110b5-1 plan
Maurice Sciammas
EVP, WW Sales & Marketing · sold 30 at $1,351.61
41K
<0.1% of stake
Jun 110b5-1 plan
Maurice Sciammas
EVP, WW Sales & Marketing · sold 30 at $1,533.95
46K
<0.1% of stake
May 27No plan
Saria Tseng
EVP & General Counsel · sold 7,565 at $1,700.00
$12.9M
5.0% of stake
May 26No plan
Robert W Dean II
Interim CFO · sold 22 at $1,649.56
36K
0.4% of stake
May 26No plan
Jeff Zhou
Director · sold 486 at $1,680.00
816K
11% of stake
May 22No plan
Saria Tseng
EVP & General Counsel · sold 5,000 at $1,586.43
$7.93M
3.2% of stake
May 18No plan
Michael Hsing
CEO · sold 40,000 at avg $1,482.75
$59.3M
3.9% of stake
May 18No plan
Robert W Dean II
Interim CFO · sold 4 at $1,563.28
6K
<0.1% of stake
May 1510b5-1 plan
Maurice Sciammas
EVP, WW Sales & Marketing · sold 12,000 at avg $1,561.40
$18.7M
4.4% of stake
May 6No plan
Eugen J Elmiger
Director · sold 12,000 at avg $1,584.96
$19M
69% of stake
May 6No plan
Deming Xiao
EVP, Global Operations · sold 30,000 at avg $1,654.55
$49.6M
12% of stake
May 6No plan
Eileen Wynne
Director · sold 335 at $1,582.68
530K
25% of stake
May 5 – 6No plan
Jeff Zhou
Director · sold 1,514 at avg $1,607.85
$2.43M
26% of stake
May 5No plan
Maurice Sciammas
EVP, WW Sales & Marketing · sold 380 at $1,583.81
602K
0.1% of stake
May 410b5-1 plan
Maurice Sciammas
EVP, WW Sales & Marketing · sold 30 at $1,588.73
48K
<0.1% of stake
Apr 810b5-1 plan
Saria Tseng
EVP & General Counsel · sold 8,963 at avg $1,305.22
$11.7M
5.4% of stake
Apr 610b5-1 plan
Saria Tseng
EVP & General Counsel · sold 7,636 at avg $1,167.95
$8.92M
4.4% of stake
Apr 110b5-1 plan
Saria Tseng
EVP & General Counsel · sold 1,400 at avg $1,133.52
$1.59M
0.8% of stake
Apr 110b5-1 plan
Maurice Sciammas
EVP, WW Sales & Marketing · sold 30 at $1,116.44
33K
<0.1% of stake
Mar 3010b5-1 plan
Saria Tseng
EVP & General Counsel · sold 25,674 at avg $1,010.50
$25.9M
13% of stake
Mar 2010b5-1 plan
Maurice Sciammas
EVP, WW Sales & Marketing · sold 30 at $1,095.07
33K
<0.1% of stake
Feb 1210b5-1 plan
Michael Hsing
CEO · sold 33,000 at avg $1,171.83
$38.7M
3.1% of stake
Feb 1110b5-1 plan
Michael Hsing
CEO · sold 33,000 at avg $1,188.92
$39.2M
3.0% of stake
Feb 11No plan
Maurice Sciammas
EVP, WW Sales & Marketing · sold 200 at $1,179.98
236K
<0.1% of stake
Feb 1010b5-1 plan
Michael Hsing
CEO · sold 34,000 at avg $1,142.28
$38.8M
3.0% of stake
Feb 910b5-1 plan
Victor K Lee
Director · sold 400 at $1,212.16
485K
1.4% of stake
Feb 6No plan
Deming Xiao
EVP, Global Operations · sold 22,875 at $1,171.16
$26.8M
8.1% of stake
Feb 6No plan
Saria Tseng
EVP & General Counsel · sold 22,875 at $1,171.16
$26.8M
10% of stake
Feb 6No plan
Maurice Sciammas
EVP, WW Sales & Marketing · sold 22,875 at $1,171.16
$26.8M
7.7% of stake
Feb 6No plan
Theodore Blegen
EVP and CFO · sold 21,725 at $1,171.16
$25.4M
19% of stake
Feb 6No plan
Michael Hsing
CEO · sold 54,923 at $1,171.16
$64.3M
4.6% of stake
Feb 210b5-1 plan
Theodore Blegen
EVP and CFO · sold 3,000 at avg $1,129.76
$3.39M
3.8% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch MPWR, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Held by ETFs

MPWR is in 381 US ETFs. The largest of them, with MPWR's weight in each:

Spot a number that looks wrong? Check it in MPWR's SEC filings or

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Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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