MKS
MKSI · NASDAQ
Who owns MKSI
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 42.7% of MKSI’s shares.
- BlackRock Institutional Trust Company, N.A.8.6%
- Invesco Advisers, Inc.5.6%
- Vanguard Portfolio Management, LLC5.5%
- Vanguard Capital Management, LLC4.5%
- Next 6 largest institutions18.5%
- All other shareholders57.3%
| Holder | Shares | % of shares |
|---|---|---|
| BlackRock Institutional Trust Company, N.A. | 5.83M | 8.64% |
| Invesco Advisers, Inc. | 3.77M | 5.59% |
| Vanguard Portfolio Management, LLC | 3.71M | 5.49% |
| Vanguard Capital Management, LLC | 3.05M | 4.52% |
| JP Morgan Asset Management | 2.87M | 4.25% |
| State Street Investment Management (US) | 2.13M | 3.16% |
| Point72 Asset Management, L.P. | 2.00M | 2.96% |
| Capital International Investors | 1.92M | 2.84% |
| Aspex Management (HK) Limited | 1.82M | 2.70% |
| T. Rowe Price Associates, Inc. | 1.75M | 2.60% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| American Funds SMALLCAP World Fund | 2.45M | 3.63% |
| iShares Core S&P Mid-Cap ETF | 2.36M | 3.50% |
| Vanguard Total Stock Market Index Fund | 2.15M | 3.18% |
| Vanguard Small-Cap Index Fund | 1.55M | 2.30% |
| Invesco Small Cap Value Fund | 1.15M | 1.70% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $25.03M (26 trades) of MKSI on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Mora Elizabeth | Sale | 300 | $75.29K |
| Donlan Renee Martel | Award | 954 | — |
| Lee John Tseng-Chung | Sale | 10.00K | $3.02M |
| Williams John Edward | Sale | 457 | $131.76K |
| Schreiner James Alan | Sale | 217 | $75.30K |
| Schreiner James Alan | Sale | 812 | $281.28K |
| Schreiner James Alan | Sale | 2.47K | $853.79K |
| Schreiner James Alan | Sale | 781 | $247.91K |
| McCarthy Michelle M | Sale | 2.43K | $767.27K |
| Henry David Philip | Sale | 6.00K | $1.89M |
Congressional trades
Disclosed by members of Congress over the last 12 months
| Member | Type | Amount | Traded |
|---|---|---|---|
| Lisa McClainHouse | Sale | $1K–$15K | Oct 31, 2025 |
| Lisa McClainHouse | Sale | $1K–$15K | Oct 30, 2025 |
Short interest
Settled Sep 30, 2026
- Shares short
- 5.09M
- Days to cover
- 4.22
- % of shares outstanding
- 7.53%
- Average daily volume
- 1.21M
- Change since last report
- −16.3%
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