SEC Form 4 · accession 0001049502-26-000115
MKS INC · MKSI
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Renee Martel Donlan
Officer — EVP, GC & CCO
Period of report
Aug 17, 2026
Accepted (ET)
Aug 18, 2026 · 2:07 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0001049502
Table I — non-derivative securities
No Table I lines on this filing.
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Restricted Stock UnitF1,F2 | — | Aug 17, 2026 | A | 954 | A | — | — | Common Stock | 954 | 4,781 | D |
Explanation of responses
- F1Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.
- F2These RSUs vest in three equal annual installments commencing on August 17, 2027, provided that if, in any vesting year, August 17th is not a business day, such vesting shall occur on the next business day.