| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Taranto Eric Robert | EVP & GM, VSD | C/O MKS INC., 2 TECH DRIVE, ANDOVER | /s/ M. Kathryn Rickards, attorney-in-fact | 23 Feb 2026 | 0001842235 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | MKSI | Common Stock | Sale | $359,623 | -1,453 | -6.8% | $247.55 | 20,013 | 20 Feb 2026 | Direct |