MPWR
MONOLITHIC POWER SYSTEMS INC
Semiconductors & Related DevicesNasdaqLarge accelerated filer
Total Trades
251
Buys
0
Sells
241
Largest Trade
N/A
Insiders
11
Institutional Funds
939
Inst. Value
$1M+
Activist Filings
13
Insider Trades
| Insider | Title | Type | Value | Shares | Price | Date |
|---|---|---|---|---|---|---|
| Hsing Michael | CEO | SELL | $1M+ | 33K | $1171.83 | Feb 17, 2026 |
| Hsing Michael | CEO | SELL | $1M+ | 33K | $1188.92 | Feb 13, 2026 |
| Sciammas Maurice | EVP | SELL | $100K–$500K | 200 | $1179.97 | Feb 13, 2026 |
| Hsing Michael | CEO | SELL | $1M+ | 34K | $1142.28 | Feb 12, 2026 |
| Lee Victor K | Director | SELL | $100K–$500K | 400 | $1212.16 | Feb 11, 2026 |
| Xiao Deming | EVP | SELL | $1M+ | 23K | $1171.16 | Feb 10, 2026 |
| Tseng Saria | EVP & General Coun… | SELL | $1M+ | 23K | $1171.16 | Feb 10, 2026 |
| Sciammas Maurice | EVP | SELL | $1M+ | 23K | $1171.16 | Feb 10, 2026 |
| BLEGEN THEODORE | EVP and CFO | SELL | $1M+ | 22K | $1171.16 | Feb 10, 2026 |
| Hsing Michael | CEO | SELL | $1M+ | 55K | $1171.16 | Feb 10, 2026 |
| BLEGEN THEODORE | EVP and CFO | SELL | $1M+ | 3K | $1129.76 | Feb 4, 2026 |
| Lee Victor K | Director | SELL | $500K+ | 600 | $930.86 | Jan 6, 2026 |
| BLEGEN THEODORE | EVP and CFO | SELL | $1M+ | 3K | $940.47 | Jan 6, 2026 |
| Lee Victor K | Director | SELL | $500K+ | 1K | $951.72 | Dec 29, 2025 |
| BLEGEN THEODORE | EVP and CFO | SELL | $1M+ | 3K | $908.21 | Dec 3, 2025 |
| Tseng Saria | EVP & General Coun… | SELL | $1M+ | 20K | $926.47 | Nov 28, 2025 |
| Tseng Saria | EVP & General Coun… | SELL | $1M+ | 20K | $904.18 | Nov 28, 2025 |
| CHANG KUO WEI HERBERT | Director | SELL | $50K–$100K | 100 | $896.97 | Nov 25, 2025 |
| Sciammas Maurice | EVP | SELL | $1M+ | 4K | $895.23 | Nov 25, 2025 |
| CHANG KUO WEI HERBERT | Director | SELL | $50K–$100K | 100 | $873.97 | Nov 24, 2025 |
| Sciammas Maurice | EVP | SELL | $1M+ | 28K | $881.66 | Nov 20, 2025 |
| Sciammas Maurice | EVP | SELL | $1M+ | 7K | $870.21 | Nov 20, 2025 |
| Hsing Michael | CEO | SELL | $1M+ | 37K | $965.52 | Nov 13, 2025 |
| Hsing Michael | CEO | SELL | $1M+ | 40K | $958.39 | Nov 13, 2025 |
| Sciammas Maurice | EVP | SELL | $100K–$500K | 200 | $986.81 | Nov 6, 2025 |
| BLEGEN THEODORE | EVP and CFO | SELL | $1M+ | 3K | $1024.43 | Nov 5, 2025 |
| Tseng Saria | EVP & General Coun… | SELL | $1M+ | 1K | $1087.62 | Oct 24, 2025 |
| BLEGEN THEODORE | EVP and CFO | SELL | $1M+ | 3K | $913.22 | Oct 2, 2025 |
| Martinez Carintia | Director | SELL | $1M+ | 1K | $900.00 | Sep 23, 2025 |
| Tseng Saria | EVP & General Coun… | SELL | $1M+ | 15K | $914.45 | Sep 23, 2025 |
| BLEGEN THEODORE | EVP and CFO | SELL | $1M+ | 3K | $814.34 | Sep 3, 2025 |
| Elmiger Eugen J | Director | SELL | $1M+ | 4K | $846.71 | Sep 2, 2025 |
| Zhou Jeff | Director | SELL | $100K–$500K | 193 | $870.00 | Aug 28, 2025 |
| BLEGEN THEODORE | EVP and CFO | SELL | $1M+ | 6K | $750.00 | Jul 2, 2025 |
| CHANG KUO WEI HERBERT | Director | SELL | $15K–$50K | 50 | $738.00 | May 13, 2025 |
| CHANG KUO WEI HERBERT | Director | SELL | $50K–$100K | 100 | $698.00 | May 13, 2025 |
| Sciammas Maurice | EVP | SELL | $1M+ | 12K | $701.00 | May 12, 2025 |
| CHANG KUO WEI HERBERT | Director | SELL | $50K–$100K | 100 | $650.00 | May 9, 2025 |
| Hsing Michael | CEO | SELL | $1M+ | 5K | $700.00 | Feb 21, 2025 |
| Hsing Michael | CEO | SELL | $1M+ | 4K | $700.00 | Jan 28, 2025 |
| Xiao Deming | EVP | SELL | $500K+ | 866 | $765.14 | Nov 13, 2024 |
| Tseng Saria | EVP & General Coun… | SELL | $500K+ | 866 | $765.14 | Nov 13, 2024 |
| Sciammas Maurice | EVP | SELL | $500K+ | 866 | $765.14 | Nov 13, 2024 |
| BLEGEN THEODORE | EVP and CFO | SELL | $500K+ | 734 | $765.15 | Nov 13, 2024 |
| Hsing Michael | CEO | SELL | $1M+ | 3K | $765.15 | Nov 13, 2024 |
| BLEGEN THEODORE | EVP and CFO | SELL | $1M+ | 3K | $772.96 | Nov 5, 2024 |
| Sciammas Maurice | EVP | SELL | $1M+ | 11K | $929.59 | Oct 8, 2024 |
| BLEGEN THEODORE | EVP and CFO | SELL | $1M+ | 3K | $908.36 | Oct 2, 2024 |
| BLEGEN THEODORE | EVP and CFO | SELL | $1M+ | 3K | $904.20 | Sep 3, 2024 |
| Xiao Deming | EVP | SELL | $1M+ | 9K | $950.00 | Aug 29, 2024 |
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Institutional Ownership
13F filings as of Dec 31, 2025 · 939 funds holding
| Fund | Shares | Value | Type |
|---|---|---|---|
| STATE STREET CORP | 2.2M | $1M+ | SH |
| GEODE CAPITAL MANAGEMENT, LLC | 1.2M | $1M+ | SH |
| NORGES BANK | 727K | $1M+ | SH |
| FIRST TRUST ADVISORS LP | 701K | $1M+ | SH |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 436K | $1M+ | SH |
| BARCLAYS PLC | 410K | $1M+ | SH |
| Rafferty Asset Management, LLC | 396K | $1M+ | SH |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 365K | $1M+ | SH |
| SG Americas Securities, LLC | 262K | $1M+ | SH |
| BNP PARIBAS FINANCIAL MARKETS | 247K | $1M+ | SH |
| AMERICAN CENTURY COMPANIES INC | 204K | $1M+ | SH |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 203K | $1M+ | SH |
| Neuberger Berman Group LLC | 178K | $1M+ | SH |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 165K | $1M+ | SH |
| KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC | 158K | $1M+ | SH |
| EARNEST PARTNERS LLC | 157K | $1M+ | SH |
| Pictet Asset Management Holding SA | 153K | $1M+ | SH |
| TimesSquare Capital Management, LLC | 140K | $1M+ | SH |
| CAISSE DE DEPOT ET PLACEMENT DU QUEBEC | 137K | $1M+ | SH |
| ALLIANCEBERNSTEIN L.P. | 135K | $1M+ | SH |
Activist & 5%+ Owners
SC 13D/13G filings — investors holding 5%+ of outstanding shares
SC 13G/A · Feb 5, 2026
8.3%
4.0M shares
SC 13G/A · Jan 8, 2026
10.2%
4.9M shares
SC 13G/A · Jul 29, 2025
12.4%
5.9M shares
SC 13G/A · Apr 17, 2025
9.8%
4.7M shares
SC 13G/A · Apr 17, 2025
9.8%
4.7M shares
SC 13G/A · Nov 12, 2024
7.2%
3.5M shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G · Feb 14, 2024
4.6%
2.2M shares
The Vanguard Group - 23-1945930
SC 13G/A · Feb 13, 2024
11.4%
5.5M shares
SC 13G/A · Jan 24, 2024
10.9%
5.2M shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G · Feb 14, 2023
7.8%
3.7M shares
SC 13G/A · Jan 26, 2023
11.6%
5.5M shares
SC 13G · Jan 20, 2023
11.6%
5.5M shares
SC 13G/A · Jan 28, 2022
13.0%
6.0M shares