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 |
|---|---|---|---|---|---|---|
| Zhou Jeff | Director | SELL | $100K–$500K | 200 | $540.00 | Aug 12, 2022 |
| BLEGEN THEODORE | CFO | SELL | $500K+ | 1K | $525.95 | Aug 12, 2022 |
| Hsing Michael | CEO | SELL | $1M+ | 6K | $525.95 | Aug 12, 2022 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $500K+ | 2K | $525.95 | Aug 12, 2022 |
| Tseng Saria | VP & General Counsel | SELL | $500K+ | 2K | $525.95 | Aug 12, 2022 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $500K+ | 2K | $525.95 | Aug 12, 2022 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $500K+ | 984 | $522.39 | Aug 8, 2022 |
| BLEGEN THEODORE | CFO | SELL | $100K–$500K | 848 | $522.38 | Aug 8, 2022 |
| Hsing Michael | CEO | SELL | $1M+ | 4K | $522.39 | Aug 8, 2022 |
| Tseng Saria | VP & General Counsel | SELL | $500K+ | 984 | $522.39 | Aug 8, 2022 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $1M+ | 5K | $529.61 | Aug 8, 2022 |
| Zhou Jeff | Director | SELL | $100K–$500K | 200 | $520.00 | Aug 3, 2022 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $1M+ | 5K | $361.58 | Jul 6, 2022 |
| Tseng Saria | VP & General Counsel | SELL | $1M+ | 5K | $361.58 | Jul 6, 2022 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $1M+ | 5K | $361.58 | Jul 6, 2022 |
| BLEGEN THEODORE | CFO | SELL | $100K–$500K | 950 | $361.58 | Jul 6, 2022 |
| Hsing Michael | CEO | SELL | $1M+ | 11K | $361.57 | Jul 6, 2022 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $500K+ | 1K | $457.00 | May 31, 2022 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $1M+ | 4K | $392.44 | May 26, 2022 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $500K+ | 2K | $388.10 | May 16, 2022 |
| Tseng Saria | VP & General Counsel | SELL | $500K+ | 2K | $388.10 | May 16, 2022 |
| BLEGEN THEODORE | CFO | SELL | $500K+ | 1K | $388.10 | May 16, 2022 |
| Hsing Michael | CEO | SELL | $1M+ | 6K | $388.10 | May 16, 2022 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $500K+ | 2K | $388.10 | May 16, 2022 |
| BLEGEN THEODORE | CFO | SELL | $100K–$500K | 850 | $453.16 | May 5, 2022 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $100K–$500K | 986 | $453.16 | May 5, 2022 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $100K–$500K | 986 | $453.16 | May 5, 2022 |
| Tseng Saria | VP & General Counsel | SELL | $100K–$500K | 986 | $453.16 | May 5, 2022 |
| Hsing Michael | CEO | SELL | $1M+ | 4K | $453.15 | May 5, 2022 |
| BLEGEN THEODORE | CFO | SELL | $100K–$500K | 930 | $467.22 | Apr 5, 2022 |
| Tseng Saria | VP & General Counsel | SELL | $1M+ | 4K | $467.23 | Apr 5, 2022 |
| Hsing Michael | CEO | SELL | $1M+ | 11K | $467.23 | Apr 5, 2022 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $1M+ | 4K | $467.23 | Apr 5, 2022 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $1M+ | 4K | $467.23 | Apr 5, 2022 |
| BLEGEN THEODORE | CFO | SELL | $500K+ | 2K | $452.11 | Feb 24, 2022 |
| BLEGEN THEODORE | CFO | SELL | $500K+ | 1K | $429.60 | Feb 16, 2022 |
| Hsing Michael | CEO | SELL | $1M+ | 6K | $429.60 | Feb 16, 2022 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $500K+ | 2K | $429.60 | Feb 16, 2022 |
| Tseng Saria | VP & General Counsel | SELL | $500K+ | 2K | $429.60 | Feb 16, 2022 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $500K+ | 2K | $429.60 | Feb 16, 2022 |
| Tseng Saria | VP & General Counsel | SELL | $1M+ | 9K | $399.62 | Feb 9, 2022 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $1M+ | 9K | $399.62 | Feb 9, 2022 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $1M+ | 10K | $399.60 | Feb 9, 2022 |
| Hsing Michael | CEO | SELL | $1M+ | 37K | $399.66 | Feb 9, 2022 |
| BLEGEN THEODORE | CFO | SELL | $1M+ | 7K | $399.56 | Feb 9, 2022 |
| BLEGEN THEODORE | CFO | SELL | $500K+ | 2K | $414.46 | Jan 24, 2022 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $1M+ | 4K | $490.87 | Jan 5, 2022 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $1M+ | 4K | $490.87 | Jan 5, 2022 |
| BLEGEN THEODORE | CFO | SELL | $100K–$500K | 905 | $490.87 | Jan 5, 2022 |
| Hsing Michael | CEO | SELL | $1M+ | 11K | $490.87 | Jan 5, 2022 |
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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