| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Henry David Philip | EVP, Global Str Mktg & GM, MSD | C/O MKS INC., 2 TECH DRIVE, ANDOVER | /s/ M. Kathryn Rickards, attorney-in-fact | 23 Feb 2026 | 0001842459 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | MKSI | Common Stock | Sale | $523,120 | -2,000 | -9.6% | $261.56 | 18,841 | 20 Feb 2026 | Direct |