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 |
|---|---|---|---|---|---|---|
| BLEGEN THEODORE | CFO | SELL | $1M+ | 5K | $521.13 | Feb 21, 2023 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $1M+ | 13K | $519.54 | Feb 17, 2023 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $500K+ | 1K | $530.00 | Feb 17, 2023 |
| BLEGEN THEODORE | CFO | SELL | $500K+ | 1K | $492.31 | Feb 14, 2023 |
| Hsing Michael | CEO | SELL | $1M+ | 6K | $492.31 | Feb 14, 2023 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $500K+ | 2K | $492.31 | Feb 14, 2023 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $500K+ | 2K | $492.31 | Feb 14, 2023 |
| Tseng Saria | VP & General Counsel | SELL | $500K+ | 2K | $492.31 | Feb 14, 2023 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $1M+ | 2K | $520.00 | Feb 10, 2023 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $1M+ | 7K | $462.41 | Feb 10, 2023 |
| Hsing Michael | CEO | SELL | $1M+ | 22K | $462.41 | Feb 10, 2023 |
| BLEGEN THEODORE | CFO | SELL | $1M+ | 6K | $462.41 | Feb 10, 2023 |
| Tseng Saria | VP & General Counsel | SELL | $1M+ | 7K | $462.41 | Feb 10, 2023 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $1M+ | 7K | $462.41 | Feb 10, 2023 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $100K–$500K | 723 | $446.88 | Feb 8, 2023 |
| Xiao Deming | Pres. of MPS Asia … | GRANT | N/A | 35K | — | Feb 8, 2023 |
| Tseng Saria | VP & General Counsel | SELL | $100K–$500K | 723 | $446.88 | Feb 8, 2023 |
| Tseng Saria | VP & General Counsel | GRANT | N/A | 35K | — | Feb 8, 2023 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $100K–$500K | 723 | $446.87 | Feb 8, 2023 |
| Sciammas Maurice | Sr. V.P.of Sales a… | GRANT | N/A | 35K | — | Feb 8, 2023 |
| Hsing Michael | CEO | SELL | $1M+ | 4K | $446.88 | Feb 8, 2023 |
| Hsing Michael | CEO | GRANT | N/A | 113K | — | Feb 8, 2023 |
| BLEGEN THEODORE | CFO | SELL | $100K–$500K | 608 | $446.87 | Feb 8, 2023 |
| BLEGEN THEODORE | CFO | GRANT | N/A | 23K | — | Feb 8, 2023 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $1M+ | 10K | $430.00 | Jan 25, 2023 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $1M+ | 3K | $400.00 | Jan 17, 2023 |
| Tseng Saria | VP & General Counsel | SELL | $1M+ | 6K | $344.96 | Jan 5, 2023 |
| Hsing Michael | CEO | SELL | $1M+ | 15K | $344.96 | Jan 5, 2023 |
| BLEGEN THEODORE | CFO | SELL | $500K+ | 2K | $344.96 | Jan 5, 2023 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $1M+ | 6K | $344.96 | Jan 5, 2023 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $1M+ | 6K | $344.96 | Jan 5, 2023 |
| Moyer James C | Director | SELL | $1M+ | 40K | $386.53 | Dec 12, 2022 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $1M+ | 5K | $369.27 | Nov 25, 2022 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $1M+ | 4K | $401.92 | Nov 17, 2022 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $500K+ | 2K | $392.88 | Nov 16, 2022 |
| Tseng Saria | VP & General Counsel | SELL | $500K+ | 2K | $392.70 | Nov 16, 2022 |
| Hsing Michael | CEO | SELL | $1M+ | 6K | $392.87 | Nov 16, 2022 |
| BLEGEN THEODORE | CFO | SELL | $500K+ | 1K | $392.53 | Nov 16, 2022 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $1M+ | 4K | $355.74 | Nov 9, 2022 |
| Hsing Michael | CEO | SELL | $1M+ | 4K | $343.98 | Nov 7, 2022 |
| Tseng Saria | VP & General Counsel | SELL | $100K–$500K | 982 | $343.98 | Nov 7, 2022 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $100K–$500K | 982 | $343.98 | Nov 7, 2022 |
| BLEGEN THEODORE | CFO | SELL | $100K–$500K | 847 | $343.98 | Nov 7, 2022 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $100K–$500K | 982 | $343.98 | Nov 7, 2022 |
| Xiao Deming | Pres. of MPS Asia … | SELL | $1M+ | 4K | $372.60 | Oct 4, 2022 |
| BLEGEN THEODORE | CFO | SELL | $100K–$500K | 905 | $372.60 | Oct 4, 2022 |
| Sciammas Maurice | Sr. V.P.of Sales a… | SELL | $1M+ | 4K | $372.60 | Oct 4, 2022 |
| Hsing Michael | CEO | SELL | $1M+ | 11K | $372.60 | Oct 4, 2022 |
| Tseng Saria | VP & General Counsel | SELL | $1M+ | 4K | $372.60 | Oct 4, 2022 |
| Moyer James C | Director | SELL | $1M+ | 10K | $385.89 | Sep 26, 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