CIK 0001049502 · Large accelerated filer
MKS INC
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- MKSI
- Exchange
- Nasdaq
- Industry
- Industrial Instruments For Measurement, Display, and Control
- FY end
- Dec 31
- Incorporated
- MA
- Entity type
- operating
- EIN
- 042277512
- Phone
- 978-645-5500
- Business address
- 2 TECH DRIVE, ANDOVER, MA, 01810
- Former names
- MKS INSTRUMENTS INC
- Open-market buys, last 90 days
- $0
- in 0 filings
- Open-market sales, last 90 days
- $75,288
- in 1 filing, $75K under 10b5-1 plans
Net −$75,288. Shares bought or sold at a price by officers, directors and 10% owners (Form 4 codes P and S). Grants, option exercises and tax withholding aren't counted.
Who's trading
90 days
Reading 100 more Form 4s from the SEC; this list fills in as they're read.
| Date | Insider | Transaction | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|
| 2026-09-01 | Mora Elizabeth Director | Sale 10b5-1 | −300 | $250.96 | $75K | 18,845.35 |
| 2026-08-14 | Lee John Tseng-Chung President & CEO | Sale 10b5-1 | −10,000 | $302.01 | $3.0M | 134,776.27 |
| 2026-08-03 | Williams John Edward EVP & GM, PSD | Sale 10b5-1 | −457 | $288.31 | $132K | 4,097.84 |
| 2026-06-12 | Schreiner James Alan EVP & COO | Sale | −2,471 | $345.52 | $854K | 20,230.12 |
| 2026-06-12 | Schreiner James Alan EVP & COO | Sale | −812 | $346.41 | $281K | 19,418.12 |
| 2026-06-12 | Schreiner James Alan EVP & COO | Sale | −217 | $347.00 | $75K | 19,201.12 |
| 2026-06-10 | Schreiner James Alan EVP & COO | Sale 10b5-1 | −781 | $317.42 | $248K | 22,701.12 |
| 2026-06-05 | McCarthy Michelle M SVP & Chief Accounting Officer | Sale 10b5-1 | −2,434 | $315.23 | $767K | 1.55 |
| 2026-06-01 | Henry David Philip EVP, Global Str Mktg & GM, MSD | Sale | −6,000 | $314.43 | $1.9M | 10,421.53 |
| 2026-06-01 | Mora Elizabeth Director | Sale 10b5-1 | −300 | $318.02 | $95K | 19,145.35 |
| 2026-05-27 | Donahue Joseph B Director | Sale | −2,100 | $327.95 | $689K | 10,032.7 |
| 2026-05-27 | COLELLA GERALD G Director | Sale 10b5-1 | −464 | $330.38 | $153K | 39,553 |
| 2026-05-27 | COLELLA GERALD G Director | Sale 10b5-1 | −8,210 | $331.45 | $2.7M | 31,343 |
| 2026-05-27 | COLELLA GERALD G Director | Sale 10b5-1 | −4,876 | $332.04 | $1.6M | 26,467 |
| 2026-05-27 | COLELLA GERALD G Director | Sale 10b5-1 | −1,811 | $335.46 | $608K | 24,656 |
| 2026-05-27 | COLELLA GERALD G Director | Sale 10b5-1 | −1,626 | $336.54 | $547K | 23,030 |
| 2026-05-27 | COLELLA GERALD G Director | Sale 10b5-1 | −213 | $337.05 | $72K | 22,817 |
| 2026-05-27 | COLELLA GERALD G Director | Sale 10b5-1 | −2,800 | $338.58 | $948K | 20,017 |
| 2026-05-26 | Henry David Philip EVP, Global Str Mktg & GM, MSD | Sale 10b5-1 | −2,500 | $330.50 | $826K | 16,341.37 |
| 2026-05-22 | Mayampurath Ramakumar EVP & CFO | Sale 10b5-1 | −8,810 | $315.48 | $2.8M | 1.14 |
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