AlphaYouJT
Insider selling
John Tseng-Chung Lee sold $3M of Mks Inc (MKSI) stock
John Tseng-Chung Lee, President & CEO of Mks Inc (MKSI), sold 10,000 shares of MKSI stock worth $3M, per an SEC Form 4 filed Aug 17, 2026.
The sale was pre-arranged (a 10b5-1 plan or an option exercise), not a fresh decision.
The trade happened on Aug 14, 2026, 3 days before it was made public.
MKSI has moved -17.3% since the trade date, from $310.73 to $256.92 (Sep 21, 2026 close).
- Traded
- Aug 14, 2026
- Disclosed
- Aug 17, 2026
- Filing delay
- 3 days
- Price since
- -17.3%
- Role
- President & CEO
- Source
- SEC Form 4
More MKSI insider and Congress trades
From a public SEC Form 4, linked above. Not investment advice, and not a recommendation to buy or sell.