MKS Instruments Inc (MKSI)
Technology
Scientific & Technical Instruments
297.50 $
+1.4%
vs. previous close
Closing price · As of: 31. Jul 2026
Who owns MKS Instruments Inc (MKSI)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.4% of the shares are freely tradable; institutional investors hold 104.9%.
Ownership Structure
Institutional ownership
Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings.
104.9%
Insiders
Share of the stock held by the executives, founders and major shareholders of the company itself.
0.5%
Float
Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders.
99.4%
Short % of float
Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices.
7.7%
Shares Outstanding
Total number of shares issued. Price times share count gives market cap.
68Mio.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Group Inc | 11.09 | 7,487,305 | -3.4 | 12/31/2025 |
| BlackRock Inc | 9.83 | 6,641,730 | +8.2 | 03/31/2026 |
| Amvescap Plc. | 5.51 | 3,721,459 | -3.5 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 5.46 | 3,685,493 | +0.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.46 | 3,014,201 | +0.0 | 03/31/2026 |
| JPMorgan Chase & Co | 3.10 | 2,096,342 | +35.1 | 03/31/2026 |
| State Street Corp | 3.05 | 2,057,732 | +2.0 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| American Funds SMALLCAP World A | 3.79 | 2,559,003 | -3.1 | 03/31/2026 |
| iShares Core S&P Mid-Cap ETF | 3.37 | 2,278,615 | +0.0 | 05/29/2026 |
| Vanguard Total Stock Mkt Idx Inv | 3.17 | 2,141,698 | +0.2 | 04/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.