Monolithic Power Systems, Inc.

MPWR · Technology · Monolithic Power Systems, Inc. provides semiconductor-based power electronics solutions in China, Taiwan, South Korea, Southeast Asia, Euro…

Monolithic Power Systems, Inc. (MPWR), in the Technology sector, has 44 disclosed filings on Paydirt over the trailing twelve months from 4 members of Congress and 10 corporate insiders: 3 purchases and 41 sales. Filers took a median of 2 days from execution to disclosure, and the most recent trade was executed Sep 28 and filed Sep 30. The most active filer was Saria Tseng with 9 filings. Data as of Nov 7 2026.

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Filings, ttm

3 buys · 41 sells

Traders, ttm

4 congress · 10 insiders

Volume, ttmiDollar value disclosed in the window

$577.2M

estimated for Congress, as filed for insiders

Median delay

execution to disclosure

Last traded

Sep 28

Filed Sep 30

ADViAverage daily dollar volume

$1.2B

market data

Share price · 12M

$1,426 (+47.0%)

Adjusted for splits and dividends.

Volume by month

Buys $114K Sells $854.1M

Estimated for Congress, as filed for insiders · by filing month · past 24 months

Who filed · past 24 months

MH Michael Hsing CEO 14 filings · 0 buys, 14 sales ST Saria Tseng EVP & General Counsel 14 filings · 0 buys, 14 sales MS Maurice Sciammas EVP, WW Sales & Marketing 13 filings · 0 buys, 13 sales TB Theodore Blegen EVP and CFO 12 filings · 0 buys, 12 sales DX Deming Xiao EVP, Global Operations 5 filings · 0 buys, 5 sales JZ Jeff Zhou Director 5 filings · 0 buys, 5 sales VL Victor K Lee Director 3 filings · 0 buys, 3 sales EE Eugen J Elmiger Director 2 filings · 0 buys, 2 sales

All 16 filers

Markwayne Mullin Senator (Spouse) 2 filings · 2 buys, 0 sales RB

Rob Bresnahan Representative (Joint) 2 filings · 1 buy, 1 sale BD

Byron Donalds Representative (Spouse) 1 filing · 0 buys, 1 sale RI Robert W Dean Ii Interim CFO 1 filing · 0 buys, 1 sale CM Carintia Martinez Director 1 filing · 0 buys, 1 sale MG

Michael Patrick Guest Representative (Spouse) 1 filing · 1 buy, 0 sales TT

Thomas H Tuberville Senator (Joint) 1 filing · 0 buys, 1 sale EW Eileen Wynne Director 1 filing · 0 buys, 1 sale

Recent filings

Michael HsingSALE CEO $40.3M
30,000 sh across 8 lots
Exec Sep 28
Filed Sep 30 · 5:21 PM ET Robert W Dean IiSALE Interim CFO $141K
105 sh × $1,344.27
Exec Aug 5
Filed Aug 6 · 6:20 PM ET Thomas H TubervilleSALE Senator (Joint) $8K
$1K–15K bracket
Exec May 3 2024
Filed Aug 5 Maurice SciammasSALE EVP, WW Sales & Marketing $20.1M
14,900 sh across 16 lots
Exec Jul 15
Filed Jul 17 · 5:43 PM ET Byron DonaldsSALE Representative $16K
2 lots · $2K–30K bracket
Exec Jun 5
Filed Jul 15 Saria TsengSALE EVP & General Counsel $12.9M
7,565 sh × $1,700.00
Exec May 27
Filed May 29 · 5:30 PM ET Saria TsengSALE EVP & General Counsel $7.9M
5,000 sh × $1,586.43
Exec May 22
Filed May 27 · 5:30 PM ET Jeff ZhouSALE Director $816K
486 sh × $1,680.00
Exec May 26
Filed May 27 · 5:30 PM ET Michael HsingSALE CEO $59.3M
40,000 sh across 13 lots
Exec May 18
Filed May 20 · 5:30 PM ET Maurice SciammasSALE EVP, WW Sales & Marketing $18.7M
11,950 sh across 7 lots
Exec May 15
Filed May 19 · 5:30 PM ET Eileen WynneSALE Director $530K
335 sh × $1,582.68
Exec May 6
Filed May 8 · 5:30 PM ET Deming XiaoSALE EVP, Global Operations $49.6M
30,000 sh across 4 lots
Exec May 6
Filed May 8 · 5:30 PM ET Eugen J ElmigerSALE Director $19.0M
12,000 sh across 9 lots
Exec May 6
Filed May 8 · 5:30 PM ET Maurice SciammasSALE EVP, WW Sales & Marketing $602K
380 sh × $1,583.81
Exec May 5
Filed May 6 · 5:30 PM ET Jeff ZhouSALE Director $2.4M
1,514 sh across 3 lots
Exec May 5
Filed May 6 · 5:30 PM ET Saria TsengSALE EVP & General Counsel $11.7M
8,963 sh across 10 lots
Exec Apr 8
Filed Apr 10 · 5:30 PM ET Saria TsengSALE EVP & General Counsel $8.9M
7,636 sh across 8 lots
Exec Apr 6
Filed Apr 8 · 5:30 PM ET Saria TsengSALE EVP & General Counsel $1.6M
1,400 sh across 5 lots
Exec Apr 1
Filed Apr 3 · 5:30 PM ET Saria TsengSALE EVP & General Counsel $25.9M
25,594 sh across 7 lots
Exec Mar 30
Filed Apr 1 · 5:30 PM ET Markwayne MullinPURCHASE Senator (Joint) $33K
$15K–50K bracket
Exec Feb 4
Filed Mar 2 Michael HsingSALE CEO $38.7M
33,000 sh across 12 lots
Exec Feb 12
Filed Feb 17 · 5:30 PM ET Michael HsingSALE CEO $39.2M
33,000 sh across 10 lots
Exec Feb 11
Filed Feb 13 · 5:30 PM ET Michael HsingSALE CEO $38.8M
34,000 sh across 9 lots
Exec Feb 10
Filed Feb 12 · 5:30 PM ET Maurice SciammasSALE EVP, WW Sales & Marketing $236K
200 sh × $1,179.98
Exec Feb 11
Filed Feb 12 · 5:30 PM ET Victor K LeeSALE Director $485K
400 sh × $1,212.16
Exec Feb 9
Filed Feb 11 · 5:30 PM ET