MKS Instruments is trading 16.29% up at $315.42 in after-hours trading, with no confirmed catalyst identified.
- It closed at $271.24 on October 1, 2026; the provided price context indicates a sharp after-hours move.
- Its next earnings report is listed for November 4, 2026; its latest earnings were reported in August.
- Available search results found no new company announcement or other confirmed catalyst, and broad-market conditions do not clearly explain the rise.