Monolithic Power Systems
MPWR · NASDAQ
Who owns MPWR
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 45.1% of MPWR’s shares.
- Fidelity Management & Research Company LLC10.0%
- BlackRock Institutional Trust Company, N.A.7.5%
- Vanguard Capital Management, LLC6.4%
- Vanguard Portfolio Management, LLC5.1%
- Next 6 largest institutions16.1%
- All other shareholders54.9%
| Holder | Shares | % of shares |
|---|---|---|
| Fidelity Management & Research Company LLC | 4.91M | 9.99% |
| BlackRock Institutional Trust Company, N.A. | 3.70M | 7.54% |
| Vanguard Capital Management, LLC | 3.13M | 6.36% |
| Vanguard Portfolio Management, LLC | 2.50M | 5.10% |
| State Street Investment Management (US) | 2.28M | 4.65% |
| Invesco Capital Management LLC | 1.72M | 3.49% |
| Geode Capital Management, L.L.C. | 1.20M | 2.43% |
| Hsing (Michael R) | 1.03M | 2.10% |
| T. Rowe Price Associates, Inc. | 904.21K | 1.84% |
| Franklin Advisers, Inc. | 796.11K | 1.62% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Fidelity Select Semiconductors Portfolio | 1.84M | 3.75% |
| Vanguard Total Stock Market Index Fund | 1.49M | 3.03% |
| Vanguard 500 Index Fund | 1.29M | 2.63% |
| iShares Semiconductor ETF | 1.11M | 2.26% |
| Invesco QQQ Trust | 1.06M | 2.15% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $192.67M (71 trades) of MPWR on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Tseng Saria | Gift | 2.00K | — |
| Tseng Saria | Gift | 2.00K | — |
| DEAN ROBERT W II | Other | 5 | — |
| DEAN ROBERT W II | Sale | 32 | $41.53K |
| CHANG KUO WEI HERBERT | Sale | 50 | $64.08K |
| DEAN ROBERT W II | Sale | 6 | $8.48K |
| CHANG KUO WEI HERBERT | Sale | 50 | $71.00K |
| DEAN ROBERT W II | Sale | 105 | $141.15K |
| Sciammas Maurice | Gift | 25.00K | — |
| Sciammas Maurice | Gift | 25.00K | — |
Congressional trades
Disclosed by members of Congress over the last 12 months
| Member | Type | Amount | Traded |
|---|---|---|---|
| Byron DonaldsHouse | Sale | $1K–$15K | Jun 5, 2026 |
| Byron DonaldsHouse | Sale | $1K–$15K | Jun 5, 2026 |
| Markwayne MullinSenator | Purchase | $15K–$50K | Feb 4, 2026 |
| Markwayne MullinSenator | Purchase | $15K–$50K | Jan 5, 2026 |
| Michael GuestHouse | Purchase | $1K–$15K | Oct 20, 2025 |
Short interest
Settled Sep 30, 2026
- Shares short
- 1.86M
- Days to cover
- 2.33
- % of shares outstanding
- 3.78%
- Average daily volume
- 799.00K
- Change since last report
- −2.5%
Information on this page is provided for informational purposes only and is not a recommendation to buy, sell or hold any security. Investing involves risk, including possible loss of principal. Market data is delayed at least 15 minutes and is provided without warranty. Analyst ratings, price targets and company data come from third-party sources. Past performance does not guarantee future results.