MPWR

Monolithic Power Systems, INC.

Insider trading activity for Monolithic Power Systems, INC., straight from SEC Form 4 filings. Net figures below count open-market buys and sales only — grants, option exercises and tax withholding are excluded because they are compensation, not decisions to trade.

Past 3 months

-$120.3M

net selling

Bought(0 · 0 insiders): $0
Sold(49 · 6 insiders): $120.3M

Past 6 months

-$192.6M

net selling

Bought(0 · 0 insiders): $0
Sold(68 · 9 insiders): $192.6M

Past 12 months

-$192.6M

net selling

Bought(0 · 0 insiders): $0
Sold(68 · 9 insiders): $192.6M

Transaction history

The 76 most recent Form 4 transactions.

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Date	Insider	Role	Type	Shares	Price	Value	Δ Own	Filing
Aug 11	Chang Kuo Wei Herbert	Director	SSELL	50	$1,420.00	$71K	-8.1%	Open the original filing on SEC.gov
Aug 5	Dean Robert W II	Interim CFO	SSELL	105	$1,344.27	$141.1K	-1.5%	Open the original filing on SEC.gov
Aug 4	Sciammas Maurice	EVP, WW Sales &…	GGIFT	25,000	—	—	+226.0%	Open the original filing on SEC.gov
Aug 4	Sciammas Maurice	EVP, WW Sales &…	GGIFT	25,000	—	—	-16.5%	Open the original filing on SEC.gov
Aug 3	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	30	$1,343.94	$40.3K	-2.6%	Open the original filing on SEC.gov
Jul 25	Dean Robert W II	Interim CFO	AGRANT	1,359	—	—	+23.1%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	110	$1,405.71	$154.6K	<0.1%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	117	$1,400.45	$163.9K	<0.1%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	213	$1,396.16	$297.4K	-0.1%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	50	$1,388.19	$69.4K	<0.1%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	410	$1,384.11	$567.5K	-0.3%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	418	$1,378.73	$576.3K	-0.3%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	472	$1,375.47	$649.2K	-0.3%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	240	$1,369.18	$328.6K	-0.2%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	50	$1,359.36	$68K	<0.1%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	5,640	$1,352.95	$7.6M	-3.5%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	1,506	$1,348.91	$2M	-0.9%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	1,864	$1,344.16	$2.5M	-1.1%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	1,460	$1,339.59	$2M	-0.9%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	776	$1,334.59	$1M	-0.5%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	464	$1,329.30	$616.8K	-0.3%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	409	$1,323.93	$541.5K	-0.3%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	274	$1,318.42	$361.2K	-0.2%	Open the original filing on SEC.gov
Jul 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	527	$1,314.03	$692.5K	-0.3%	Open the original filing on SEC.gov
Jul 1	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	30	$1,351.61	$40.5K	-2.5%	Open the original filing on SEC.gov
Jun 1	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	30	$1,533.95	$46K	-2.5%	Open the original filing on SEC.gov
May 29	Sciammas Maurice	EVP, WW Sales &…	GGIFT	12,472	—	—	-49.7%	Open the original filing on SEC.gov
May 27	Tseng Saria	EVP & General Counsel	SSELL	7,565	$1,700.00	$12.9M	-5.0%	Open the original filing on SEC.gov
May 26	Zhou Jeff	Director	SSELL	486	$1,680.00	$816.5K	-11.3%	Open the original filing on SEC.gov
May 26	Dean Robert W II	Interim CFO	SSELL	22	$1,649.56	$36.3K	-0.4%	Open the original filing on SEC.gov
May 22	Tseng Saria	EVP & General Counsel	SSELL	5,000	$1,586.43	$7.9M	-3.2%	Open the original filing on SEC.gov
May 22	Tseng Saria	EVP & General Counsel	GGIFT	200	—	—	-0.1%	Open the original filing on SEC.gov
May 18	Hsing Michael	CEO	SSELL	130	$1,521.43	$197.8K	<0.1%	Open the original filing on SEC.gov
May 18	Hsing Michael	CEO	SSELL	352	$1,518.15	$534.4K	<0.1%	Open the original filing on SEC.gov
May 18	Hsing Michael	CEO	SSELL	551	$1,513.11	$833.7K	<0.1%	Open the original filing on SEC.gov
May 18	Hsing Michael	CEO	SSELL	3,769	$1,507.70	$5.7M	-0.4%	Open the original filing on SEC.gov
May 18	Hsing Michael	CEO	SSELL	2,929	$1,503.05	$4.4M	-0.3%	Open the original filing on SEC.gov
May 18	Hsing Michael	CEO	SSELL	608	$1,499.46	$911.7K	<0.1%	Open the original filing on SEC.gov
May 18	Hsing Michael	CEO	SSELL	862	$1,491.48	$1.3M	-0.1%	Open the original filing on SEC.gov
May 18	Hsing Michael	CEO	SSELL	6,688	$1,486.76	$9.9M	-0.8%	Open the original filing on SEC.gov
May 18	Hsing Michael	CEO	SSELL	5,737	$1,482.51	$8.5M	-0.7%	Open the original filing on SEC.gov
May 18	Hsing Michael	CEO	SSELL	4,082	$1,476.96	$6M	-0.5%	Open the original filing on SEC.gov
May 18	Hsing Michael	CEO	SSELL	5,049	$1,472.84	$7.4M	-0.6%	Open the original filing on SEC.gov
May 18	Hsing Michael	CEO	SSELL	5,819	$1,467.62	$8.5M	-0.7%	Open the original filing on SEC.gov
May 18	Hsing Michael	CEO	SSELL	3,424	$1,462.61	$5M	-0.4%	Open the original filing on SEC.gov
May 18	Dean Robert W II	Interim CFO	SSELL	4	$1,563.28	$6.3K	<0.1%	Open the original filing on SEC.gov
May 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	50	$1,585.51	$79.3K	<0.1%	Open the original filing on SEC.gov
May 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	447	$1,582.21	$707.2K	-0.3%	Open the original filing on SEC.gov
May 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	703	$1,577.75	$1.1M	-0.4%	Open the original filing on SEC.gov
May 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	1,312	$1,571.49	$2.1M	-0.8%	Open the original filing on SEC.gov
May 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	2,020	$1,567.15	$3.2M	-1.2%	Open the original filing on SEC.gov
May 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	2,010	$1,562.01	$3.1M	-1.2%	Open the original filing on SEC.gov
May 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	1,717	$1,557.48	$2.7M	-1.0%	Open the original filing on SEC.gov
May 15	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	3,741	$1,550.36	$5.8M	-2.1%	Open the original filing on SEC.gov
May 13	Sciammas Maurice	EVP, WW Sales &…	GGIFT	1,563	—	—	+3.2%	Open the original filing on SEC.gov
May 13	Sciammas Maurice	EVP, WW Sales &…	GGIFT	1,563	—	—	-5.9%	Open the original filing on SEC.gov
May 13	Dean Robert W II	Interim CFO	JOTHER	2,156	—	—	-26.8%	Open the original filing on SEC.gov
May 6	Zhou Jeff	Director	SSELL	500	$1,650.00	$825K	-10.4%	Open the original filing on SEC.gov
May 6	Xiao Deming	EVP, Global Operations	SSELL	907	$1,661.38	$1.5M	-0.4%	Open the original filing on SEC.gov
May 6	Xiao Deming	EVP, Global Operations	SSELL	11,597	$1,657.93	$19.2M	-5.3%	Open the original filing on SEC.gov
May 6	Xiao Deming	EVP, Global Operations	SSELL	14,167	$1,652.80	$23.4M	-6.1%	Open the original filing on SEC.gov
May 6	Xiao Deming	EVP, Global Operations	SSELL	3,329	$1,648.38	$5.5M	-1.4%	Open the original filing on SEC.gov
May 6	Wynne Eileen	Director	SSELL	335	$1,582.68	$530.2K	-25.0%	Open the original filing on SEC.gov
May 6	Elmiger Eugen J	Director	SSELL	514	$1,600.14	$822.5K	-8.7%	Open the original filing on SEC.gov
May 6	Elmiger Eugen J	Director	SSELL	2,619	$1,596.42	$4.2M	-30.7%	Open the original filing on SEC.gov
May 6	Elmiger Eugen J	Director	SSELL	1,355	$1,591.38	$2.2M	-13.7%	Open the original filing on SEC.gov
May 6	Elmiger Eugen J	Director	SSELL	2,587	$1,586.81	$4.1M	-20.7%	Open the original filing on SEC.gov
May 6	Elmiger Eugen J	Director	SSELL	1,879	$1,581.81	$3M	-13.1%	Open the original filing on SEC.gov
May 6	Elmiger Eugen J	Director	SSELL	834	$1,575.57	$1.3M	-5.5%	Open the original filing on SEC.gov
May 6	Elmiger Eugen J	Director	SSELL	1,078	$1,571.58	$1.7M	-6.6%	Open the original filing on SEC.gov
May 6	Elmiger Eugen J	Director	SSELL	814	$1,566.36	$1.3M	-4.8%	Open the original filing on SEC.gov
May 6	Elmiger Eugen J	Director	SSELL	320	$1,559.88	$499.2K	-1.8%	Open the original filing on SEC.gov
May 5	Zhou Jeff	Director	SSELL	500	$1,600.00	$800K	-9.5%	Open the original filing on SEC.gov
May 5	Zhou Jeff	Director	SSELL	514	$1,574.48	$809.3K	-8.9%	Open the original filing on SEC.gov
May 5	Sciammas Maurice	EVP, WW Sales &…	SSELL	380	$1,583.81	$601.8K	-29.3%	Open the original filing on SEC.gov
May 4	Sciammas Maurice	EVP, WW Sales &…	SSELL◷	30	$1,588.73	$47.7K	-2.4%	Open the original filing on SEC.gov

SSELL$71K

Chang Kuo Wei Herbert · DirectorAug 11

50 sh @ $1,420.00 · -8.1% own

SSELL$141.1K

Dean Robert W II · Interim CFOAug 5

105 sh @ $1,344.27 · -1.5% own

GGIFT—

Sciammas Maurice · EVP, WW Sales &…Aug 4

25,000 sh · +226.0% own

GGIFT—

Sciammas Maurice · EVP, WW Sales &…Aug 4

25,000 sh · -16.5% own

SSELL◷$40.3K

Sciammas Maurice · EVP, WW Sales &…Aug 3

30 sh @ $1,343.94 · -2.6% own

AGRANT—

Dean Robert W II · Interim CFOJul 25

1,359 sh · +23.1% own

SSELL◷$154.6K

Sciammas Maurice · EVP, WW Sales &…Jul 15

110 sh @ $1,405.71 · <0.1% own

SSELL◷$163.9K

Sciammas Maurice · EVP, WW Sales &…Jul 15

117 sh @ $1,400.45 · <0.1% own

SSELL◷$297.4K

Sciammas Maurice · EVP, WW Sales &…Jul 15

213 sh @ $1,396.16 · -0.1% own

SSELL◷$69.4K

Sciammas Maurice · EVP, WW Sales &…Jul 15

50 sh @ $1,388.19 · <0.1% own

SSELL◷$567.5K

Sciammas Maurice · EVP, WW Sales &…Jul 15

410 sh @ $1,384.11 · -0.3% own

SSELL◷$576.3K

Sciammas Maurice · EVP, WW Sales &…Jul 15

418 sh @ $1,378.73 · -0.3% own

SSELL◷$649.2K

Sciammas Maurice · EVP, WW Sales &…Jul 15

472 sh @ $1,375.47 · -0.3% own

SSELL◷$328.6K

Sciammas Maurice · EVP, WW Sales &…Jul 15

240 sh @ $1,369.18 · -0.2% own

SSELL◷$68K

Sciammas Maurice · EVP, WW Sales &…Jul 15

50 sh @ $1,359.36 · <0.1% own

SSELL◷$7.6M

Sciammas Maurice · EVP, WW Sales &…Jul 15

5,640 sh @ $1,352.95 · -3.5% own

SSELL◷$2M

Sciammas Maurice · EVP, WW Sales &…Jul 15

1,506 sh @ $1,348.91 · -0.9% own

SSELL◷$2.5M

Sciammas Maurice · EVP, WW Sales &…Jul 15

1,864 sh @ $1,344.16 · -1.1% own

SSELL◷$2M

Sciammas Maurice · EVP, WW Sales &…Jul 15

1,460 sh @ $1,339.59 · -0.9% own

SSELL◷$1M

Sciammas Maurice · EVP, WW Sales &…Jul 15

776 sh @ $1,334.59 · -0.5% own

SSELL◷$616.8K

Sciammas Maurice · EVP, WW Sales &…Jul 15

464 sh @ $1,329.30 · -0.3% own

SSELL◷$541.5K

Sciammas Maurice · EVP, WW Sales &…Jul 15

409 sh @ $1,323.93 · -0.3% own

SSELL◷$361.2K

Sciammas Maurice · EVP, WW Sales &…Jul 15

274 sh @ $1,318.42 · -0.2% own

SSELL◷$692.5K

Sciammas Maurice · EVP, WW Sales &…Jul 15

527 sh @ $1,314.03 · -0.3% own

SSELL◷$40.5K

Sciammas Maurice · EVP, WW Sales &…Jul 1

30 sh @ $1,351.61 · -2.5% own

SSELL◷$46K

Sciammas Maurice · EVP, WW Sales &…Jun 1

30 sh @ $1,533.95 · -2.5% own

GGIFT—

Sciammas Maurice · EVP, WW Sales &…May 29

12,472 sh · -49.7% own

SSELL$12.9M

Tseng Saria · EVP & General…May 27

7,565 sh @ $1,700.00 · -5.0% own

SSELL$816.5K

Zhou Jeff · DirectorMay 26

486 sh @ $1,680.00 · -11.3% own

SSELL$36.3K

Dean Robert W II · Interim CFOMay 26

22 sh @ $1,649.56 · -0.4% own

SSELL$7.9M

Tseng Saria · EVP & General…May 22

5,000 sh @ $1,586.43 · -3.2% own

GGIFT—

Tseng Saria · EVP & General…May 22

200 sh · -0.1% own

SSELL$197.8K

Hsing Michael · CEOMay 18

130 sh @ $1,521.43 · <0.1% own

SSELL$534.4K

Hsing Michael · CEOMay 18

352 sh @ $1,518.15 · <0.1% own

SSELL$833.7K

Hsing Michael · CEOMay 18

551 sh @ $1,513.11 · <0.1% own

SSELL$5.7M

Hsing Michael · CEOMay 18

3,769 sh @ $1,507.70 · -0.4% own

SSELL$4.4M

Hsing Michael · CEOMay 18

2,929 sh @ $1,503.05 · -0.3% own

SSELL$911.7K

Hsing Michael · CEOMay 18

608 sh @ $1,499.46 · <0.1% own

SSELL$1.3M

Hsing Michael · CEOMay 18

862 sh @ $1,491.48 · -0.1% own

SSELL$9.9M

Hsing Michael · CEOMay 18

6,688 sh @ $1,486.76 · -0.8% own

SSELL$8.5M

Hsing Michael · CEOMay 18

5,737 sh @ $1,482.51 · -0.7% own

SSELL$6M

Hsing Michael · CEOMay 18

4,082 sh @ $1,476.96 · -0.5% own

SSELL$7.4M

Hsing Michael · CEOMay 18

5,049 sh @ $1,472.84 · -0.6% own

SSELL$8.5M

Hsing Michael · CEOMay 18

5,819 sh @ $1,467.62 · -0.7% own

SSELL$5M

Hsing Michael · CEOMay 18

3,424 sh @ $1,462.61 · -0.4% own

SSELL$6.3K

Dean Robert W II · Interim CFOMay 18

4 sh @ $1,563.28 · <0.1% own

SSELL◷$79.3K

Sciammas Maurice · EVP, WW Sales &…May 15

50 sh @ $1,585.51 · <0.1% own

SSELL◷$707.2K

Sciammas Maurice · EVP, WW Sales &…May 15

447 sh @ $1,582.21 · -0.3% own

SSELL◷$1.1M

Sciammas Maurice · EVP, WW Sales &…May 15

703 sh @ $1,577.75 · -0.4% own

SSELL◷$2.1M

Sciammas Maurice · EVP, WW Sales &…May 15

1,312 sh @ $1,571.49 · -0.8% own

SSELL◷$3.2M

Sciammas Maurice · EVP, WW Sales &…May 15

2,020 sh @ $1,567.15 · -1.2% own

SSELL◷$3.1M

Sciammas Maurice · EVP, WW Sales &…May 15

2,010 sh @ $1,562.01 · -1.2% own

SSELL◷$2.7M

Sciammas Maurice · EVP, WW Sales &…May 15

1,717 sh @ $1,557.48 · -1.0% own

SSELL◷$5.8M

Sciammas Maurice · EVP, WW Sales &…May 15

3,741 sh @ $1,550.36 · -2.1% own

GGIFT—

Sciammas Maurice · EVP, WW Sales &…May 13

1,563 sh · +3.2% own

GGIFT—

Sciammas Maurice · EVP, WW Sales &…May 13

1,563 sh · -5.9% own

JOTHER—

Dean Robert W II · Interim CFOMay 13

2,156 sh · -26.8% own

SSELL$825K

Zhou Jeff · DirectorMay 6

500 sh @ $1,650.00 · -10.4% own

SSELL$1.5M

Xiao Deming · EVP, Global…May 6

907 sh @ $1,661.38 · -0.4% own

SSELL$19.2M

Xiao Deming · EVP, Global…May 6

11,597 sh @ $1,657.93 · -5.3% own

SSELL$23.4M

Xiao Deming · EVP, Global…May 6

14,167 sh @ $1,652.80 · -6.1% own

SSELL$5.5M

Xiao Deming · EVP, Global…May 6

3,329 sh @ $1,648.38 · -1.4% own

SSELL$530.2K

Wynne Eileen · DirectorMay 6

335 sh @ $1,582.68 · -25.0% own

SSELL$822.5K

Elmiger Eugen J · DirectorMay 6

514 sh @ $1,600.14 · -8.7% own

SSELL$4.2M

Elmiger Eugen J · DirectorMay 6

2,619 sh @ $1,596.42 · -30.7% own

SSELL$2.2M

Elmiger Eugen J · DirectorMay 6

1,355 sh @ $1,591.38 · -13.7% own

SSELL$4.1M

Elmiger Eugen J · DirectorMay 6

2,587 sh @ $1,586.81 · -20.7% own

SSELL$3M

Elmiger Eugen J · DirectorMay 6

1,879 sh @ $1,581.81 · -13.1% own

SSELL$1.3M

Elmiger Eugen J · DirectorMay 6

834 sh @ $1,575.57 · -5.5% own

SSELL$1.7M

Elmiger Eugen J · DirectorMay 6

1,078 sh @ $1,571.58 · -6.6% own

SSELL$1.3M

Elmiger Eugen J · DirectorMay 6

814 sh @ $1,566.36 · -4.8% own

SSELL$499.2K

Elmiger Eugen J · DirectorMay 6

320 sh @ $1,559.88 · -1.8% own

SSELL$800K

Zhou Jeff · DirectorMay 5

500 sh @ $1,600.00 · -9.5% own

SSELL$809.3K

Zhou Jeff · DirectorMay 5

514 sh @ $1,574.48 · -8.9% own

SSELL$601.8K

Sciammas Maurice · EVP, WW Sales &…May 5

380 sh @ $1,583.81 · -29.3% own

SSELL◷$47.7K

Sciammas Maurice · EVP, WW Sales &…May 4

30 sh @ $1,588.73 · -2.4% own

Filing record

How quickly insiders here report their trades. Section 16 allows two business days from the transaction.

All 24 filings we hold were filed within the two-business-day deadline.

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays. How this is measured · All late filings

Insiders at this company

Everyone who has filed a Form 4 for this issuer.