John Tseng-Chung Lee, Senior VP, HPS, Controls & PFMC at MKS INSTRUMENTS INC (MKSI), bought 443 shares at $23.96 ($11K) on 2013-11-29, disclosed to the SEC on 2013-12-04.
Seasonal purchase ($11k) by Senior VP, HPS, Controls & PFMC — this insider has traded MKSI in November in at least three consecutive prior years. Pattern-driven, low signal.
Nothing distinguishes this 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 → |