Monolithic Power Systems, Inc.
Monolithic Power Systems, Inc. (MPWR) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MPWR · as of Sep 30, 2025
Ownership Breakdown
1,015
Institutional Holders
▲ 68 vs Q2
$42.95B
Total Inst. Value
▲ $8.32B vs Q2
49.13M
Shares Outstanding
freeFloat 96.34%
69.50M
13F Shares Held
▲ 22.15M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MPWR largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
LOMBARD ODIER ASSET MANAGEMENT (EUROPE) LTD semiconductors & related devices | 22.69M | 47.40% | 47.40% | $38.00B | Nov 14, 2025 | ▲ 22.68M |
VANGUARD GROUP INC semiconductors & related devices | 6.07M | 12.69% | 12.69% | $5.59T | Nov 7, 2025 | ▲ 134.1K |
BLACKROCK, INC. semiconductors & related devices | 5.73M | 11.96% | 11.96% | $5.27T | Nov 12, 2025 | ▲ 497.6K |
FMR LLC semiconductors & related devices | 3.56M | 7.45% | 7.45% | $3.28T | Nov 13, 2025 | ▲ 172.1K |
STATE STREET CORP semiconductors & related devices | 2.13M | 4.46% | 4.46% | $1.97T | Nov 14, 2025 | ▲ 14.7K |
PRICE T ROWE ASSOCIATES INC /MD/ semiconductors & related devices | 1.57M | 3.29% | 3.29% | $1.45T | Nov 14, 2025 | ▼ 515.0K |
GEODE CAPITAL MANAGEMENT, LLC semiconductors & related devices | 1.34M | 2.79% | 2.79% | $1.23T | Nov 12, 2025 | ▲ 19.2K |
INVESCO LTD. semiconductors & related devices | 1.14M | 2.38% | 2.38% | $1.05T | Nov 13, 2025 | ▼ 26.9K |
FRANKLIN RESOURCES INC semiconductors & related devices | 1.05M | 2.20% | 2.20% | $968.56B | Nov 13, 2025 | ▼ 36.2K |
JPMORGAN CHASE & CO semiconductors & related devices | 863.2K | 1.80% | 1.80% | $794.72B | Nov 26, 2025 | ▲ 6.5K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
26
Increased
+24.58M shares1
New Positions
first time holders22
Decreased
−1.95M shares0
Sold Out
fully exitedNet shares change (top 50)
+22.63M
+24.58M / −1.95M
Net new holders
+5
1 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MPWR insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
1
Buy transactions
72
Sell transactions
0.01
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Sciammas Maurice EVP, WW Sales & Marketing | Jun 1, 2026 | Sale | 30 | $1533.95 | $46.0K | 1.2K | Form 4 ↗ |
Sciammas Maurice EVP, WW Sales & Marketing | May 29, 2026 | Gift | 12,472 | — | — | 12.6K | Form 4 ↗ |
Tseng Saria EVP & General Counsel | May 27, 2026 | Sale | 7,565 | $1700.00 | $12.86M | 144.2K | Form 4 ↗ |
DEAN ROBERT W II Interim CFO | May 26, 2026 | Sale | 22 | $1649.56 | $36.3K | 5.9K | Form 4 ↗ |
Zhou Jeff director | May 26, 2026 | Sale | 486 | $1680.00 | $816.5K | 3.8K | Form 4 ↗ |
Tseng Saria EVP & General Counsel | May 22, 2026 | Gift | 200 | — | — | 156.8K | Form 4 ↗ |
Tseng Saria EVP & General Counsel | May 22, 2026 | Sale | 5,000 | $1586.43 | $7.93M | 151.8K | Form 4 ↗ |
Hsing Michael CEO | May 18, 2026 | Sale | 3,424 | $1462.61 | $5.01M | 884.8K | Form 4 ↗ |
Hsing Michael CEO | May 18, 2026 | Sale | 5,819 | $1467.62 | $8.54M | 879.0K | Form 4 ↗ |
Hsing Michael CEO | May 18, 2026 | Sale | 5,049 | $1472.84 | $7.44M | 874.0K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Monolithic Power Systems, Inc. (MPWR) is primarily owned by institutional investors, who hold approximately 100.0% of total shares outstanding. Company insiders own approximately 3.66%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Monolithic Power Systems, Inc. is LOMBARD ODIER ASSET MANAGEMENT (EUROPE) LTD, holding approximately 22.69 million shares — equal to 47.40% of outstanding shares — as of September 30, 2025.
A total of 1,015 institutional investors currently hold MPWR stock, with a combined institutional value of approximately $42.95 billion as of the most recent 13F filing period.
Frequently asked questions
MPWR ownershipMonolithic Power Systems, Inc. (MPWR) is primarily owned by institutional investors, who hold approximately 100.0% of shares. The largest shareholder is LOMBARD ODIER ASSET MANAGEMENT (EUROPE) LTD with a 47.40% stake. Company insiders hold 3.66%. Data sourced from SEC Form 13F as of September 30, 2025.