Insider Transactions in Q4 2025 at Mks Instruments Inc (MKSI)
Insider Transaction List (Q4 2025)
| Date | Insider | Transaction | Ownership Type | Shares Traded | Value / Price |
|---|---|---|---|---|---|
|
Dec 02
2025
|
Elizabeth Mora Director |
SELL
Open market or private sale
|
Direct |
300
-1.56%
|
$47,400
$158.81 P/Share
|
|
Nov 17
2025
|
Ramakumar Mayampurath EVP & CFO |
SELL
Payment of exercise price or tax liability
|
Direct |
2,628
-31.68%
|
$373,176
$142.74 P/Share
|
|
Nov 17
2025
|
Ramakumar Mayampurath EVP & CFO |
BUY
Exercise of conversion of derivative security
|
Direct |
8,295
+50.0%
|
-
|
|
Oct 31
2025
|
Kathleen Flaherty Burke EVP, GC & Secretary |
SELL
Payment of exercise price or tax liability
|
Direct |
777
-1.5%
|
$111,111
$143.71 P/Share
|
|
Oct 31
2025
|
Kathleen Flaherty Burke EVP, GC & Secretary |
BUY
Exercise of conversion of derivative security
|
Direct |
777
+0.3%
|
-
|
|
Oct 31
2025
|
John Tseng Chung Lee President & CEO |
SELL
Payment of exercise price or tax liability
|
Direct |
2,003
-1.34%
|
$286,429
$143.71 P/Share
|
|
Oct 31
2025
|
John Tseng Chung Lee President & CEO |
BUY
Exercise of conversion of derivative security
|
Direct |
2,003
+0.67%
|
-
|
|
Oct 22
2025
|
James Alan Schreiner EVP & COO |
SELL
Open market or private sale
|
Direct |
711
-3.06%
|
$98,118
$138.68 P/Share
|
|
Oct 01
2025
|
Jacqueline F Moloney Director |
SELL
Open market or private sale
|
Direct |
300
-2.53%
|
$36,600
$122.14 P/Share
|