MKSI SEC Form 4 filings
Mks Inc Latest Insider Trading Activity
The most recent employee insider trading activity for Mks Inc reports 3 sales by Schreiner James Alan (Mks Inc EVP & COO) totaling 3,500 shares at a weighted-average price of $345.82 per share, with the latest transaction dated June 12, 2026. For the past 155 days, MKSI has had 18 total insider transactions represented in the displayed records. This page shows up to the 10 most recent SEC Form 4 filing records on a 6-hour delay. Sign up for real-time updates and access to 20 years of historic insider trading data.
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| Ticker | Filing Date | Transaction Date | Company | Insider | Title | Transaction | Trade Count | Shares | Avg. Price | Total Value | Position Size Change | SEC Filing |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. MKSI | 2026-06-16 | 2026-06-12 | Mks Inc | Schreiner James Alan | EVP & COO | Sell | 3 | 3,500 | $345.82 | $1,210,363.84 | 5.61% | View Filing |
| 10b5-1: Scheduled Form 4 Transaction MKSI | 2026-06-08 | 2026-06-05 | Mks Inc | Mccarthy Michelle M | SVP & Chief Accounting Officer | Sell | 1 | 2,434 | $315.23 | $767,269.82 | 99.94% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. MKSI | 2026-06-02 | 2026-06-01 | Mks Inc | Henry David Philip | EVP, Global Str Mktg & GM, MSD | Sell | 1 | 6,000 | $314.43 | $1,886,580.00 | 36.54% | View Filing |
| 10b5-1: Scheduled Form 4 Transaction MKSI | 2026-06-02 | 2026-06-01 | Mks Inc | Mora Elizabeth | Director | Sell | 1 | 300 | $318.02 | $95,406.00 | 1.54% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. MKSI | 2026-05-28 | 2026-05-27 | Mks Inc | Donahue Joseph B | Director | Sell | 1 | 2,100 | $327.95 | $688,695.00 | 17.31% | View Filing |
| 10b5-1: Scheduled Form 4 Transaction MKSI | 2026-05-28 | 2026-05-27 | Mks Inc | Colella Gerald G | Director | Sell | 7 | 20,000 | $333.40 | $6,668,075.61 | 9.62% | View Filing |
| 10b5-1: Scheduled Form 4 Transaction MKSI | 2026-05-27 | 2026-05-26 | Mks Inc | Henry David Philip | EVP, Global Str Mktg & GM, MSD | Sell | 1 | 2,500 | $330.50 | $826,250.00 | 13.27% | View Filing |
| 10b5-1: Scheduled Form 4 Transaction MKSI | 2026-05-26 | 2026-05-22 | Mks Inc | Mayampurath Ramakumar | EVP & CFO | Sell | 1 | 8,810 | $315.48 | $2,779,378.80 | 99.99% | View Filing |
| 10b5-1: Scheduled Form 4 Transaction MKSI | 2026-05-26 | 2026-05-22 | Mks Inc | Lee John Tseng-Chung | President & CEO | Sell | 1 | 10,000 | $315.48 | $3,154,800.00 | 6.46% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. MKSI | 2026-05-19 | 2026-05-18 | Mks Inc | Cannone Peter Iii | Director | Sell | 1 | 1,350 | $303.40 | $409,590.00 | 14.76% | View Filing |
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