Form 4 for MKSI MKS INC
Accepted 2025-11-04 00:00:00 ET · period of report 2025-10-31 · accession 0001049502-25-000037 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DM | 2025-11-04 | 2025-10-31 | MKSI | Burke Kathleen Flaherty | EVP, GC, Sec | M - OptEx | — | +777 | 51.2K | +2% | — |
| D | 2025-11-04 | 2025-10-31 | MKSI | Burke Kathleen Flaherty | EVP, GC, Sec | F - Tax | $143.71 | -777 | 51.1K | -1% | -$111.7K |
| DM | 2025-11-04 | 2025-10-31 | MKSI | Burke Kathleen Flaherty | EVP, GC, Sec | M - OptEx | — | -777 | 17.3K | -4% | — |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2025-10-31 | M | A | 52 | — | 51,284.51 | D | — | — | (F1) Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc. |
| 2 | Common | Common Stock | 2025-10-31 | M | A | 82 | — | 51,366.51 | D | — | — | (F1) Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc. |
| 3 | Common | Common Stock | 2025-10-31 | M | A | 144 | — | 51,510.51 | D | — | — | (F1) Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc. |
| 4 | Common | Common Stock | 2025-10-31 | M | A | 341 | — | 51,851.51 | D | — | — | (F1) Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc. |
| 5 | Common | Common Stock | 2025-10-31 | F | D | 777 | $143.71 | 51,074.51 | D | — | — | |
| 6 | Common | Common Stock | 2025-10-31 | M | A | 158 | — | 51,232.51 | D | — | — | (F1) Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc. |
| 7 | Derivative | Restricted Stock Unit | 2025-10-31 | M | D | 52 | — | 17,565.74 | D | — · — to — | 52 Common Stock | (F1) Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc. (F4) Portion of 2024 RSU Award accelerated to satisfy FICA taxes. |
| 8 | Derivative | Restricted Stock Unit | 2025-10-31 | M | D | 158 | — | 17,617.74 | D | — · — to — | 158 Common Stock | (F1) Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc. (F3) Portion of 2023 RSU Award accelerated to satisfy FICA taxes. |
| 9 | Derivative | Restricted Stock Unit | 2025-10-31 | M | D | 341 | — | 16,998.74 | D | — · — to — | 341 Common Stock | (F1) Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc. (F5) Portion of 2025 RSU Award accelerated to satisfy FICA taxes. |
| 10 | Derivative | Restricted Stock Unit | 2025-10-31 | M | D | 82 | — | 17,483.74 | D | — · — to — | 82 Common Stock | (F1) Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc. (F3) Portion of 2023 RSU Award accelerated to satisfy FICA taxes. |
| 11 | Derivative | Restricted Stock Unit | 2025-10-31 | M | D | 144 | — | 17,339.74 | D | — · — to — | 144 Common Stock | (F1) Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc. (F4) Portion of 2024 RSU Award accelerated to satisfy FICA taxes. |