John Tseng-Chung Lee, Group VP, CIT and PFMC at MKS INSTRUMENTS INC (MKSI), sold 6,129 shares at $31.82 ($195K) on 2011-03-08, disclosed to the SEC on 2011-03-09.
Open-market sale of $195k MKSI by Group VP, CIT and PFMC. Not flagged as scheduled, tax-driven, or recurring — but no specific bearish signal from our filters. Reasons for insider sales vary widely.
Something here stands out, but not much.
| Filing → |
| MKSI | SELL | 2026-02-23 | $7.7M | — | Filing → |
| MKSI | SELL | 2018-02-21 | $2.9M | — | Filing → |
| MKSI | SELL | 2017-11-14 | $440K | — | Filing → |