MKS Inc CEO Lee John Tseng-Chung Sells 10,000 Shares

What Happened

• Lee John Tseng-Chung, President, CEO and Director of MKS Inc (MKSI), sold 10,000 shares in an open-market transaction on August 14, 2026. The shares were sold at $302.01 per share for total proceeds of $3,020,100. The Form 4 reporting this transaction was filed on August 17, 2026.

Key Details

• Transaction date: 2026-08-14 (sale)
• Price per share: $302.01; Total proceeds: $3,020,100
• Transaction type/code: Open market sale (S)
• Footnote: Transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 20, 2026
• Filing: Form 4 filed 2026-08-17 (timely filed)
• Shares owned after transaction: Not specified in the provided excerpt (see the full Form 4 for post-transaction holdings)

Context

• This was a sale, which is often routine for insiders and may be part of a prearranged trading plan; the 10b5-1 disclosure indicates the trade was executed under a previously adopted plan, reducing the likelihood it was timed to new material information. Sales do not necessarily indicate negative views about the company—consult broader insider activity and fundamentals for additional context.