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Stock Insider Trading Activity of Lee John Tseng-chung
Lee John Tseng-Chung
Sell
President & CEO
MKSI Aug 14, 2026
Avg Cost/Share
$302.01
Shares
10,000
Total Value
$3,020,100.00
Owned After
134,776.267
SEC Form 4
Lee John Tseng-Chung
Sell
President & CEO
MKSI May 22, 2026
Avg Cost/Share
$315.48
Shares
10,000
Total Value
$3,154,800.00
Owned After
134,776.267
SEC Form 4
Lee John Tseng-Chung
Sell
President & CEO
MKSI Feb 20, 2026
Avg Cost/Share
$257.62
Shares
30,000
Total Value
$7,703,242.04
Owned After
134,776.267
| Insider | Ticker | Relationship | Date | Transaction | Avg Cost | Shares | Total Value | Owned After | SEC Forms |
|---|---|---|---|---|---|---|---|---|---|
| Lee John Tseng-Chung | MKSI | President & CEO | Aug 14, 2026 | Sell | $302.01 | 10,000 | $3,020,100.00 | 134,776.267 | |
| Lee John Tseng-Chung | MKSI | President & CEO | May 22, 2026 | Sell | $315.48 | 10,000 | $3,154,800.00 | 134,776.267 | |
| Lee John Tseng-Chung | MKSI | President & CEO | Feb 20, 2026 | Sell | $257.62 | 30,000 | $7,703,242.04 | 134,776.267 |