SEC Form 3 · accession 0001049502-26-000103
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
Jun 1, 2026
Accepted (ET)
Jun 4, 2026 · 2:24 pm EDT
Rule 10b5-1 plan
unknown — predates the checkbox
Issuer CIK
0001049502
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common Stock | holding | — | — | — | 9,472 | D |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Restricted Stock UnitF2,F1 | — | holding | — | — | — | — | — | Common Stock | 416 | — | D |
| Restricted Stock UnitF2,F3 | — | holding | — | — | — | — | — | Common Stock | 2,481 | — | D |
| Restricted Stock UnitF2,F4 | — | holding | — | — | — | — | — | Common Stock | 929 | — | D |
Explanation of responses
- F1These restricted stock units (RSUs) vest on April 15, 2027.
- F2Each RSU represents the contingent right to receive one share of common stock of MKS Inc.
- F3These RSUs vest in two equal annual installments commencing on April 15, 2027, provided that if, in any vesting year, April 15th is not a business day, such vesting shall occur on the next business day.
- F4These RSUs vest in three equal annual installments commencing on April 15, 2027, provided that if, in any vesting year, April 15th is not a business day, such vesting shall occur on the next business day.
Remarks
Exhibit 24 - Power of Attorney