John Tseng-Chung Lee, Senior VP, HPS, Controls & PFMC at MKS INSTRUMENTS INC (MKSI), bought 520 shares at $20.42 ($11K) on 2013-05-31, disclosed to the SEC on 2013-06-04.
Open-market purchase of $11k MKSI by Senior VP, HPS, Controls & PFMC. Below the thresholds we flag for high-conviction alerts (no C-suite role, rare reversal, cluster, or A-grade history).
Clearly above the average filing.
| Filing → |
| MKSI | SELL | 2026-02-23 | $7.7M | — | Filing → |
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| MKSI | SELL | 2017-11-14 | $440K | — | Filing → |