Form 4 for MKSI MKS INC
Accepted 2025-11-04 00:00:00 ET · period of report 2025-10-31 · accession 0001049502-25-000035 · 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 | Lee John Tseng-Chung | Pres, CEO, Dir | M - OptEx | — | +2,003 | 147.6K | +1% | — |
| D | 2025-11-04 | 2025-10-31 | MKSI | Lee John Tseng-Chung | Pres, CEO, Dir | F - Tax | $143.71 | -2,003 | 147.3K | -1% | -$287.9K |
| DM | 2025-11-04 | 2025-10-31 | MKSI | Lee John Tseng-Chung | Pres, CEO, Dir | M - OptEx | — | -2,003 | 89.8K | -2% | — |
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 | 1,651 | — | 149,272.52 | 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 | F | D | 2,003 | $143.71 | 147,269.52 | D | — | — | |
| 3 | Common | Common Stock | 2025-10-31 | M | A | 352 | — | 147,621.52 | D | — | — | (F1) Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc. |
| 4 | Derivative | Restricted Stock Unit | 2025-10-31 | M | D | 1,651 | — | 88,152.62 | D | — · — to — | 1,651 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 2025 RSU Award accelerated to satisfy FICA taxes. |
| 5 | Derivative | Restricted Stock Unit | 2025-10-31 | M | D | 352 | — | 89,803.62 | D | — · — to — | 352 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 2024 RSU Award accelerated to satisfy FICA taxes. |