MPWR
MONOLITHIC POWER SYSTEMS INC
NASDAQ · Technology · Semiconductors · US
$1,253.66
+3.53%0
Insider buys (3m)
14
Insider sells (3m)
-$40.7M
Net value (3m)
-4.3%
Price return (3m)
Form 4 filings
| Date | Insider | Activity | Shares | Price |
|---|---|---|---|---|
| Sep 30, 2026 | Hsing Michael · director, officer: CEO | Sale | 596 | $1.3K |
| Sep 30, 2026 | Hsing Michael · director, officer: CEO | Sale | 1,111 | $1.3K |
| Sep 30, 2026 | Hsing Michael · director, officer: CEO | Sale | 6,343 | $1.3K |
| Sep 30, 2026 | Hsing Michael · director, officer: CEO | Sale | 2,121 | $1.3K |
| Sep 30, 2026 | Hsing Michael · director, officer: CEO | Sale | 5,783 | $1.3K |
| Sep 30, 2026 | Hsing Michael · director, officer: CEO | Sale | 10,967 | $1.4K |
| Sep 30, 2026 | Hsing Michael · director, officer: CEO | Sale | 130 | $1.4K |
| Sep 30, 2026 | Hsing Michael · director, officer: CEO | Sale | 2,949 | $1.3K |
| Aug 26, 2026 | DEAN ROBERT W II · officer: Interim CFO | Sale | 32 | $1.3K |
| Aug 25, 2026 | CHANG KUO WEI HERBERT · director | Sale | 50 | $1.3K |
| Aug 19, 2026 | DEAN ROBERT W II · officer: Interim CFO | Sale | 6 | $1.4K |
| Aug 13, 2026 | CHANG KUO WEI HERBERT · director | Sale | 50 | $1.4K |
| Aug 6, 2026 | DEAN ROBERT W II · officer: Interim CFO | Sale | 105 | $1.3K |
| Aug 5, 2026 | Sciammas Maurice · officer: EVP, WW Sales & Marketing | Sale | 30 | $1.3K |
| Jul 28, 2026 | DEAN ROBERT W II · officer: Interim CFO | A-Award | 1,359 | $0.00 |
| Jul 17, 2026 | Sciammas Maurice · officer: EVP, WW Sales & Marketing | Sale | 472 | $1.4K |
| Jul 17, 2026 | Sciammas Maurice · officer: EVP, WW Sales & Marketing | Sale | 410 | $1.4K |
| Jul 17, 2026 | Sciammas Maurice · officer: EVP, WW Sales & Marketing | Sale | 527 | $1.3K |
| Jul 17, 2026 | Sciammas Maurice · officer: EVP, WW Sales & Marketing | Sale | 110 | $1.4K |
| Jul 17, 2026 | Sciammas Maurice · officer: EVP, WW Sales & Marketing | Sale | 464 | $1.3K |
| Jul 17, 2026 | Sciammas Maurice · officer: EVP, WW Sales & Marketing | Sale | 776 | $1.3K |
| Jul 17, 2026 | Sciammas Maurice · officer: EVP, WW Sales & Marketing | Sale | 1,506 | $1.3K |
| Jul 17, 2026 | Sciammas Maurice · officer: EVP, WW Sales & Marketing | Sale | 5,640 | $1.4K |
| Jul 17, 2026 | Sciammas Maurice · officer: EVP, WW Sales & Marketing | Sale | 418 | $1.4K |
| Jul 17, 2026 | Sciammas Maurice · officer: EVP, WW Sales & Marketing | Sale | 1,460 | $1.3K |
| Jul 17, 2026 | Sciammas Maurice · officer: EVP, WW Sales & Marketing | Sale | 1,864 | $1.3K |
| Jul 17, 2026 | Sciammas Maurice · officer: EVP, WW Sales & Marketing | Sale | 117 | $1.4K |
| Jul 17, 2026 | Sciammas Maurice · officer: EVP, WW Sales & Marketing | Sale | 50 | $1.4K |
| Jul 17, 2026 | Sciammas Maurice · officer: EVP, WW Sales & Marketing | Sale | 240 | $1.4K |
| Jul 17, 2026 | Sciammas Maurice · officer: EVP, WW Sales & Marketing | Sale | 409 | $1.3K |
Institutional positioning
13F filings over the trailing two quarters
New 395Increased 805Reduced 902Sold out 101
| Filer | Action | Shares | Filed |
|---|---|---|---|
| BLACKROCK, INC. | Increased | 6,072,467 | May 13, 2026 |
| BlackRock, Inc. | Reduced | 5,589,925 | Aug 7, 2026 |
| FMR LLC | Increased | 5,177,258 | Aug 13, 2026 |
| FMR LLC | Increased | 4,400,831 | May 15, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 3,126,756 | Aug 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 3,083,449 | May 15, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 2,516,492 | May 8, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Reduced | 2,504,858 | Aug 13, 2026 |
| Invesco Ltd. | Increased | 2,343,930 | Aug 14, 2026 |
| STATE STREET CORP | Increased | 2,282,186 | Sep 22, 2026 |
| STATE STREET CORP | Increased | 2,188,454 | May 15, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 1,432,066 | May 15, 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ | Reduced | 1,262,954 | May 15, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Reduced | 1,195,281 | Aug 12, 2026 |
| INVESCO LTD. | Reduced | 1,030,894 | Jul 15, 2026 |
Insider activity from SEC Form 4; institutional positioning from 13F filings · Latest filing Sep 30, 2026