Lee John Tseng-Chung - Insider Non-Derivative Transactions at MKS INSTRUMENTS 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 INSTRUMENTS 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 |
| Dec 7, 2024 | F -- (Common Stock) | 2994 | 114.6 | 112688.55 |
| Dec 7, 2024 | M -- (Common Stock) | 2010 | 0 | 114698.55 |
| Dec 7, 2024 | M -- (Common Stock) | 984 | 0 | 115682.55 |
| Feb 16, 2024 | M -- (Common Stock) | 9235.4 | 0 | 87373.16 |
| Feb 16, 2024 | M -- (Common Stock) | 3777.85 | 0 | 91151.01 |
| Feb 16, 2024 | M -- (Common Stock) | 14041 | 0 | 105192.01 |
| Feb 16, 2024 | M -- (Common Stock) | 6734 | 0 | 111926.01 |
| Feb 16, 2024 | F -- (Common Stock) | 30231 | 122.15 | 112441.01 |
| Feb 16, 2024 | M -- (Common Stock) | 23093 | 0 | 135019.01 |
| Feb 16, 2024 | M -- (Common Stock) | 7653 | 0 | 142672.01 |
| Dec 2, 2023 | F -- (Common Stock) | 3275 | 84.19 | 78138.61 |
| Dec 2, 2023 | M -- (Common Stock) | 390 | 0 | 78528.61 |
| Dec 2, 2023 | M -- (Common Stock) | 1186 | 0 | 79714.61 |
| Dec 2, 2023 | M -- (Common Stock) | 160 | 0 | 79874.61 |
| Dec 2, 2023 | M -- (Common Stock) | 569 | 0 | 80443.61 |
| Dec 2, 2023 | M -- (Common Stock) | 970 | 0 | 81413.61 |
| Feb 16, 2023 | M -- (Common Stock) | 7535.72 | 0 | 59229.85 |
| Feb 16, 2023 | M -- (Common Stock) | 4281.59 | 0 | 63511.44 |
| Feb 16, 2023 | M -- (Common Stock) | 9624 | 0 | 73135.44 |
| Feb 16, 2023 | M -- (Common Stock) | 3937 | 0 | 77072.44 |
| Feb 16, 2023 | F -- (Common Stock) | 20862 | 100.29 | 77862.44 |
| Feb 16, 2023 | M -- (Common Stock) | 14634 | 0 | 91706.44 |
| Feb 16, 2023 | M -- (Common Stock) | 7018 | 0 | 98724.44 |
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