Stocks
MPWR Monolithic Power Systems Inc

MPWR

Monolithic Power Systems Inc

Company with tickers: MPWR

CIK

1280452

CUSIP

609839105

Shares Outstanding

49,130,000

Price History Institutional Holders Short Volume Short Interest Fails to Deliver Financials SEC Filings Earnings Calls Insider Trades Congressional Trades

Date	Insider	Role	Type	Shares	Price	Value	After
2026-05-18	Hsing Michael	Director, CEO	Sell	352	$1,518.15	$534,389	848,393
2026-05-18	Hsing Michael	Director, CEO	Sell	4,082	$1,476.96	$6,028,951	869,889
2026-05-18	Hsing Michael	Director, CEO	Other	133,040	—	—	133,040
2026-05-18	Hsing Michael	Director, CEO	Sell	3,424	$1,462.61	$5,007,977	884,839
2026-05-18	Hsing Michael	Director, CEO	Sell	608	$1,499.46	$911,672	855,994
2026-05-18	Hsing Michael	Director, CEO	Sell	862	$1,491.48	$1,285,656	856,602
2026-05-18	Hsing Michael	Director, CEO	Sell	6,688	$1,486.76	$9,943,451	857,464
2026-05-18	Hsing Michael	Director, CEO	Sell	130	$1,521.43	$197,786	848,263
2026-05-18	Hsing Michael	Director, CEO	Sell	5,737	$1,482.51	$8,505,160	864,152
2026-05-18	Hsing Michael	Director, CEO	Sell	5,819	$1,467.62	$8,540,081	879,020
2026-05-18	Hsing Michael	Director, CEO	Sell	551	$1,513.11	$833,724	848,745
2026-05-18	Hsing Michael	Director, CEO	Other	12,825	—	—	12,825
2026-05-18	Hsing Michael	Director, CEO	Sell	5,049	$1,472.84	$7,436,369	873,971
2026-05-18	Hsing Michael	Director, CEO	Sell	2,929	$1,503.05	$4,402,433	853,065
2026-05-18	Hsing Michael	Director, CEO	Sell	3,769	$1,507.70	$5,682,521	849,296
2026-05-18	DEAN ROBERT W II	Interim CFO	Other	65	—	—	65
2026-05-18	DEAN ROBERT W II	Interim CFO	Sell	4	$1,563.28	$6,253	5,900
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Sell	1,717	$1,557.48	$2,674,193	173,186
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Sell	50	$1,585.51	$79,276	166,644
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,000	—	—	1,000
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Sell	3,741	$1,550.36	$5,799,897	174,903
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Sell	2,010	$1,562.01	$3,139,640	171,176
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,699	—	—	1,699
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Sell	1,312	$1,571.49	$2,061,795	167,844
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Other	919	—	—	919
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Other	25,097	—	—	25,097
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Other	51,023	—	—	51,023
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Sell	447	$1,582.21	$707,248	166,694
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Sell	2,020	$1,567.15	$3,165,643	169,156
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Other	5,000	—	—	5,000
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,699	—	—	1,699
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Other	2,000	—	—	2,000
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,209	—	—	1,209
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Other	4,015	—	—	4,015
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,699	—	—	1,699
2026-05-15	Sciammas Maurice	EVP, WW Sales & Marketing	Sell	703	$1,577.75	$1,109,158	167,141
2026-05-13	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,699	—	—	1,699
2026-05-13	Sciammas Maurice	EVP, WW Sales & Marketing	Other	919	—	—	919
2026-05-13	Sciammas Maurice	EVP, WW Sales & Marketing	Other	178,644	—	—	178,644
2026-05-13	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,699	—	—	1,699
2026-05-13	Sciammas Maurice	EVP, WW Sales & Marketing	Gift	1,563	—	—	25,097
2026-05-13	DEAN ROBERT W II	Interim CFO	Other	2,156	—	—	5,904
2026-05-13	DEAN ROBERT W II	Interim CFO	Other	65	—	—	65
2026-05-13	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,209	—	—	1,209
2026-05-13	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,000	—	—	1,000
2026-05-13	Sciammas Maurice	EVP, WW Sales & Marketing	Other	4,015	—	—	4,015
2026-05-13	Sciammas Maurice	EVP, WW Sales & Marketing	Gift	1,563	—	—	51,023
2026-05-13	Sciammas Maurice	EVP, WW Sales & Marketing	Other	5,000	—	—	5,000
2026-05-13	Sciammas Maurice	EVP, WW Sales & Marketing	Other	2,000	—	—	2,000
2026-05-13	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,699	—	—	1,699
2026-05-06	Xiao Deming	EVP, Global Operations	Other	20,455	—	—	20,455
2026-05-06	Xiao Deming	EVP, Global Operations	Sell	907	$1,661.38	$1,506,872	205,959
2026-05-06	Xiao Deming	EVP, Global Operations	Other	4,336	—	—	4,336
2026-05-06	Xiao Deming	EVP, Global Operations	Sell	14,167	$1,652.80	$23,415,218	218,463
2026-05-06	Xiao Deming	EVP, Global Operations	Sell	11,597	$1,657.93	$19,227,014	206,866
2026-05-06	Xiao Deming	EVP, Global Operations	Sell	3,329	$1,648.38	$5,487,457	232,630
2026-05-06	Zhou Jeff	Director	Sell	500	$1,650.00	$825,000	4,286
2026-05-06	Elmiger Eugen J	Director	Sell	1,078	$1,571.58	$1,694,163	15,190
2026-05-06	Elmiger Eugen J	Director	Sell	1,879	$1,581.81	$2,972,221	12,477
2026-05-06	Elmiger Eugen J	Director	Sell	2,619	$1,596.42	$4,181,024	5,916
2026-05-06	Elmiger Eugen J	Director	Sell	834	$1,575.57	$1,314,025	14,356
2026-05-06	Elmiger Eugen J	Director	Sell	2,587	$1,586.81	$4,105,077	9,890
2026-05-06	Elmiger Eugen J	Director	Sell	1,355	$1,591.38	$2,156,320	8,535
2026-05-06	Elmiger Eugen J	Director	Sell	514	$1,600.14	$822,472	5,402
2026-05-06	Elmiger Eugen J	Director	Sell	320	$1,559.88	$499,162	17,082
2026-05-06	Elmiger Eugen J	Director	Sell	814	$1,566.36	$1,275,017	16,268
2026-05-06	Wynne Eileen	Director	Sell	335	$1,582.68	$530,198	1,007
2026-05-05	Zhou Jeff	Director	Sell	500	$1,600.00	$800,000	4,786
2026-05-05	Zhou Jeff	Director	Sell	514	$1,574.48	$809,283	5,286
2026-05-05	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,699	—	—	1,699
2026-05-05	Sciammas Maurice	EVP, WW Sales & Marketing	Other	4,015	—	—	4,015
2026-05-05	Sciammas Maurice	EVP, WW Sales & Marketing	Other	2,000	—	—	2,000
2026-05-05	Sciammas Maurice	EVP, WW Sales & Marketing	Other	5,000	—	—	5,000
2026-05-05	Sciammas Maurice	EVP, WW Sales & Marketing	Other	26,660	—	—	26,660
2026-05-05	Sciammas Maurice	EVP, WW Sales & Marketing	Other	178,644	—	—	178,644
2026-05-05	Sciammas Maurice	EVP, WW Sales & Marketing	Other	49,460	—	—	49,460
2026-05-05	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,209	—	—	1,209
2026-05-05	Sciammas Maurice	EVP, WW Sales & Marketing	Sell	380	$1,583.81	$601,848	919
2026-05-05	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,699	—	—	1,699
2026-05-05	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,699	—	—	1,699
2026-05-05	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,000	—	—	1,000
2026-05-04	Sciammas Maurice	EVP, WW Sales & Marketing	Other	49,460	—	—	49,460
2026-05-04	Sciammas Maurice	EVP, WW Sales & Marketing	Other	2,000	—	—	2,000
2026-05-04	Sciammas Maurice	EVP, WW Sales & Marketing	Other	5,000	—	—	5,000
2026-05-04	Sciammas Maurice	EVP, WW Sales & Marketing	Sell	30	$1,588.73	$47,662	1,209
2026-05-04	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,699	—	—	1,699
2026-05-04	Sciammas Maurice	EVP, WW Sales & Marketing	Other	178,644	—	—	178,644
2026-05-04	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,699	—	—	1,699
2026-05-04	Sciammas Maurice	EVP, WW Sales & Marketing	Other	26,660	—	—	26,660
2026-05-04	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,000	—	—	1,000
2026-05-04	Sciammas Maurice	EVP, WW Sales & Marketing	Other	4,015	—	—	4,015
2026-05-04	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,699	—	—	1,699
2026-05-04	Sciammas Maurice	EVP, WW Sales & Marketing	Other	1,299	—	—	1,299
2026-04-08	Tseng Saria	Director	Sell	1,279	$1,308.30	$1,673,316	162,187
2026-04-08	Tseng Saria	Director	Sell	800	$1,302.52	$1,042,016	163,466
2026-04-08	Tseng Saria	Director	Sell	400	$1,292.08	$516,832	164,266
2026-04-08	Tseng Saria	Director	Sell	120	$1,321.94	$158,633	156,983
2026-04-08	Tseng Saria	Director	Sell	560	$1,266.48	$709,229	165,386
2026-04-08	Tseng Saria	Director	Sell	360	$1,270.29	$457,304	165,026
2026-04-08	Tseng Saria	Director	Sell	4,244	$1,312.82	$5,571,608	157,943