John Tseng-Chung Lee, Senior VP, Controls & PFMC at MKS INSTRUMENTS INC (MKSI), bought 479 shares at $20.61 ($10K) on 2012-11-30, disclosed to the SEC on 2012-12-05.
Open-market purchase of $10k MKSI by Senior VP, 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 → |
| MKSI | SELL | 2018-02-21 | $2.9M | — | Filing → |
| MKSI | SELL | 2017-11-14 | $440K | — | Filing → |