Lee John Tseng-Chung - Insider Non-Derivative Transactions at MKS INC (MKSI) - (SEC)

Updated on January 3, 2026.

According to recent SEC insider information filed on Oct 31, 2025, Lee John Tseng-Chung's relationship to MKS INC (MKSI) is Director,Officer (President & CEO), and currently has 149,272.52 shares of Common Stock.

The chart below shows the number of shares owned, and the table shows the recent insider transactions.

You can see similar information for other MKSI insiders.

Related Topics: SEC Topic List.

Data Source: SEC.

Lee John Tseng-Chung - Insider Non-Derivative Transactions of MKSI Common Stock

Lee John Tseng-Chung - Insider Non-Derivative Transactions at MKSI

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Date	Transaction	No. of Shares	Price Per Share	Shares Owned After Transactions
Nov 1, 2025	F -- (Common Stock)	2003	143.71	147269.52
Nov 1, 2025	M -- (Common Stock)	352	0	147621.52
Nov 1, 2025	M -- (Common Stock)	1651	0	149272.52
Feb 19, 2025	M -- (Common Stock)	14041.44	0	126729.99
Feb 19, 2025	M -- (Common Stock)	6735.33	0	133465.32
Feb 19, 2025	F -- (Common Stock)	27332	103.67	147117.44
Feb 19, 2025	M -- (Common Stock)	22088	0	155553.32
Feb 19, 2025	M -- (Common Stock)	7654	0	163207.32
Feb 19, 2025	M -- (Common Stock)	4035.12	0	167242.44
Feb 19, 2025	M -- (Common Stock)	7207	0	174449.44