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.
8.7%
Shares Outstanding
Total number of shares issued. Price times share count gives market cap.
68Mio.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| 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 |
| Capital Research & Mgmt Co - Division 3 | 2.91 | 1,968,770 | -39.2 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| American Funds SMALLCAP World A | 3.63 | 2,453,957 | -4.1 | 06/30/2026 |
| iShares Core S&P Mid-Cap ETF | 3.42 | 2,311,042 | +0.2 | 07/28/2026 |
| Vanguard Morn Total Stk Mkt Idx Investor | 3.17 | 2,144,301 | +0.2 | 06/30/2026 |
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.