MKS INC 4

MKS INC President & CEO Lee John Tseng-Chung sold 10,000 shares of common stock for approximately $3.02 million under a Rule 10b5-1 plan.

On August 14, 2026, MKS INC President & CEO Lee John Tseng-Chung sold 10,000 shares of MKS INC common stock at an average price of $302.01 per share in a transaction executed under a pre-arranged Rule 10b5-1 trading plan, leaving him with beneficial ownership of approximately 134,776 shares following the sale. The gross value of the sale was about $3.02 million, while his remaining equity stake, based on the same price, is worth roughly $40.7 million, indicating that despite the sizable disposition, he continues to hold a substantial position in the company.

Filing Facts

CIK

1049502

Ticker

MKSI

Form

4

Source Type

sec

Accession

0001049502-26-000113

Alert Tier

7