Lee John Tseng-Chung 4

What Happened

• Lee John Tseng-Chung, President & CEO and a director of MKS INC (MKSI), reported open-market sales totaling 30,000 shares on February 20, 2026.
• The sales were reported in four tranches: 13,310 shares @ $256.05 ($3,408,076); 12,812 shares @ $256.93 ($3,291,804); 1,988 shares @ $257.81 ($512,523); and 1,890 shares @ $259.70 ($490,839). Total proceeds ≈ $7,703,242.
• These were sales (not purchases), which are often routine liquidity events for insiders; the filing does not state a purchase or exercise — it documents dispositions.

Key Details

• Transaction date: 2026-02-20; Form 4 filed: 2026-02-23 (no late filing indicated in the provided data).
• Reported weighted-average prices and ranges (multiple trades per tranche):
  • 13,310 shares: weighted avg $256.05; prices ranged $255.425–$256.415 (F1).
  • 12,812 shares: weighted avg $256.93; prices ranged $256.4275–$257.275 (F2).
  • 1,988 shares: weighted avg $257.81; prices ranged $257.445–$258.320 (F3).
  • 1,890 shares: weighted avg $259.70; prices ranged $259.170–$259.920 (F4).
• Shares owned following the transactions: not provided in the summary data — see the full Form 4 for post-transaction holdings.
• No 10b5-1 plan, tax withholding, or other special instruction is disclosed in the provided footnotes.

Context

• These were open-market sales (routine dispositions); sales do not necessarily indicate the insider's view of the company's outlook.
• For retail investors: purchases can be a stronger signal of insider conviction; sales are common for diversification or liquidity. Check the full Form 4 for holdings and any additional disclosures before drawing conclusions.