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 |
|---|---|---|---|---|---|---|
| Xiao Deming | EVP | SELL | $1M+ | 10K | $950.00 | Aug 22, 2024 |
| BLEGEN THEODORE | EVP and CFO | SELL | $1M+ | 3K | $852.51 | Aug 2, 2024 |
| Tseng Saria | EVP & General Coun… | SELL | $1M+ | 2K | $824.65 | Jul 2, 2024 |
| BLEGEN THEODORE | EVP and CFO | SELL | $1M+ | 3K | $804.19 | Jul 2, 2024 |
| Hsing Michael | CEO | SELL | $1M+ | 3K | $804.57 | Jul 2, 2024 |
| Tseng Saria | EVP & General Coun… | SELL | $1M+ | 37K | $808.20 | Jul 2, 2024 |
| Lee Victor K | Director | SELL | $500K+ | 1K | $820.46 | Jul 1, 2024 |
| Hsing Michael | CEO | SELL | $1M+ | 8K | $731.08 | Jun 5, 2024 |
| BLEGEN THEODORE | EVP and CFO | SELL | $1M+ | 3K | $731.77 | Jun 5, 2024 |
| Xiao Deming | EVP | SELL | $1M+ | 1K | $769.40 | May 23, 2024 |
| CHANG KUO WEI HERBERT | Director | SELL | $100K–$500K | 200 | $750.00 | May 22, 2024 |
| Zhou Jeff | Director | SELL | $100K–$500K | 200 | $750.00 | May 22, 2024 |
| BLEGEN THEODORE | EVP and CFO | SELL | $1M+ | 3K | $663.29 | May 3, 2024 |
| Hsing Michael | CEO | SELL | $1M+ | 8K | $661.86 | May 3, 2024 |
| Sciammas Maurice | EVP of Sales and M… | SELL | $1M+ | 11K | $681.83 | Apr 9, 2024 |
| Hsing Michael | CEO | SELL | $1M+ | 8K | $677.44 | Apr 3, 2024 |
| BLEGEN THEODORE | EVP & CFO | SELL | $1M+ | 3K | $677.40 | Apr 3, 2024 |
| Hsing Michael | CEO | SELL | $1M+ | 8K | $726.08 | Mar 4, 2024 |
| BLEGEN THEODORE | CFO | SELL | $1M+ | 3K | $725.76 | Mar 4, 2024 |
| CHANG KUO WEI HERBERT | Director | SELL | $100K–$500K | 250 | $706.34 | Feb 29, 2024 |
| CHANG KUO WEI HERBERT | Director | SELL | $100K–$500K | 250 | $750.00 | Feb 23, 2024 |
| Zhou Jeff | Director | SELL | $100K–$500K | 200 | $750.57 | Feb 13, 2024 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $500K+ | 859 | $680.00 | Feb 9, 2024 |
| Tseng Saria | Executive VP & Gen… | SELL | $500K+ | 859 | $680.00 | Feb 9, 2024 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $500K+ | 859 | $680.00 | Feb 9, 2024 |
| Hsing Michael | CEO | SELL | $1M+ | 3K | $680.00 | Feb 9, 2024 |
| BLEGEN THEODORE | CFO | SELL | $100K–$500K | 728 | $680.00 | Feb 9, 2024 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $500K+ | 982 | $641.00 | Feb 7, 2024 |
| Tseng Saria | Executive VP & Gen… | SELL | $500K+ | 982 | $641.00 | Feb 7, 2024 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $500K+ | 982 | $641.00 | Feb 7, 2024 |
| Hsing Michael | CEO | SELL | $1M+ | 4K | $641.00 | Feb 7, 2024 |
| BLEGEN THEODORE | CFO | SELL | $500K+ | 867 | $641.00 | Feb 7, 2024 |
| Hsing Michael | CEO | SELL | $1M+ | 8K | $602.01 | Feb 5, 2024 |
| BLEGEN THEODORE | CFO | SELL | $1M+ | 3K | $603.25 | Feb 5, 2024 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $1M+ | 11K | $582.11 | Jan 12, 2024 |
| BLEGEN THEODORE | CFO | SELL | $1M+ | 3K | $615.71 | Jan 3, 2024 |
| Moyer James C | Director | SELL | $1M+ | 4K | $538.94 | Nov 20, 2023 |
| CHANG KUO WEI HERBERT | Director | SELL | $100K–$500K | 400 | $523.64 | Nov 15, 2023 |
| CHANG KUO WEI HERBERT | Director | SELL | $50K–$100K | 100 | $510.00 | Nov 13, 2023 |
| BLEGEN THEODORE | CFO | SELL | $100K–$500K | 712 | $490.39 | Nov 9, 2023 |
| Hsing Michael | CEO | SELL | $1M+ | 3K | $490.39 | Nov 9, 2023 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $100K–$500K | 859 | $490.39 | Nov 9, 2023 |
| Tseng Saria | VP & General Counsel | SELL | $100K–$500K | 859 | $490.39 | Nov 9, 2023 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $100K–$500K | 859 | $490.39 | Nov 9, 2023 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $100K–$500K | 982 | $492.92 | Nov 7, 2023 |
| Tseng Saria | VP & General Counsel | SELL | $100K–$500K | 982 | $492.92 | Nov 7, 2023 |
| BLEGEN THEODORE | CFO | SELL | $100K–$500K | 847 | $492.92 | Nov 7, 2023 |
| Hsing Michael | CEO | SELL | $1M+ | 4K | $492.92 | Nov 7, 2023 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $100K–$500K | 982 | $492.92 | Nov 7, 2023 |
| Hsing Michael | CEO | SELL | $1M+ | 11K | $458.30 | Oct 4, 2023 |
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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