MKSI
MKS INC
Latest Form 4:Sale$3.0MbyLee John Tseng-Chung (President & CEO) · filed Aug 17, 2026
MKS INC (MKSI) has 55 SEC Form 4 filings (116 transaction rows) in the rolling window, disclosed by 13 distinct insiders. Most recent filing: Aug 17, 2026.
The most active filer is EVP & COO Schreiner James Alan with 5 filings. Insiders have net sold $43.3M over the trailing 6 months.
- Industry:Hardware, Equipment & Parts
- CEO:John T. C. Lee
- Employees:10,200
- HQ:Andover, MA, US
- IPO:1999-03-30
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$44.2M
reported sales (SEC code S)
Unique Insiders
13
in the rolling window
Market Cap
$17.3B
latest known value
| Source | ||||||
|---|---|---|---|---|---|---|
| President & CEO | Sale | 10,000 | $3.0M | Aug 17 | SEC ↗ | |
Williams John EdwardFirst in 5 months | EVP & GM, PSD | Sale | 457 | $132K | Aug 4 | SEC ↗ |
| EVP & COO | Sale | 3,500 | $1.2M | Jun 16 | SEC ↗ | |
Schreiner James AlanFirst in 4 months | EVP & COO | Sale | 781 | $248K | Jun 11 | SEC ↗ |
McCarthy Michelle MFirst in 4 months | SVP & Chief Accounting Officer | Sale | 2,434 | $767K | Jun 8 | SEC ↗ |
| EVP, Global Str Mktg & GM, MSD | Sale | 6,000 | $1.9M | Jun 2 | SEC ↗ | |
Mora ElizabethFirst in 3 months | Director | Sale | 300 | $95K | Jun 2 | SEC ↗ |
COLELLA GERALD GFirst in 3 months | Director | Sale | 20,000 | $6.7M | May 28 | SEC ↗ |
Donahue Joseph BFirst filing | Director | Sale | 2,100 | $689K | May 28 | SEC ↗ |
Henry David PhilipFirst in 3 months | EVP, Global Str Mktg & GM, MSD | Sale | 2,500 | $826K | May 27 | SEC ↗ |
Lee John Tseng-ChungFirst in 3 months | President & CEO | Sale | 10,000 | $3.2M | May 26 | SEC ↗ |
Mayampurath RamakumarFirst filing | EVP & CFO | Sale | 8,810 | $2.8M | May 26 | SEC ↗ |
| Director | Sale | 1,350 | $410K | May 19 | SEC ↗ | |
| Director | Sale | 1,000 | $312K | May 15 | SEC ↗ | |
| Director | Sale | 1,400 | $447K | May 14 | SEC ↗ | |
| EVP, GC & Secretary | Sale | 4,355 | $1.4M | May 12 | SEC ↗ | |
| EVP & GM, VSD | Sale | 2,848.522 | $911K | May 12 | SEC ↗ | |
| Director | Sale | 340.107 | $73K | Mar 13 | SEC ↗ | |
| EVP & GM, VSD | Sale | 4,567.879 | $1.0M | Mar 9 | SEC ↗ | |
Mora ElizabethFirst in 3 months | Director | Sale | 300 | $72K | Mar 3 | SEC ↗ |
Schreiner James AlanFirst in 4 months | EVP & COO | Sale | 4,100 | $1.0M | Feb 25 | SEC ↗ |
COLELLA GERALD GFirst filing | Director | Sale | 10,000 | $2.5M | Feb 24 | SEC ↗ |
COLELLA GERALD GFirst filing | Director | Sale | 10,000 | $2.5M | Feb 24 | SEC ↗ |
Lee John Tseng-ChungFirst filing | President & CEO | Sale | 30,000 | $7.7M | Feb 23 | SEC ↗ |
McCarthy Michelle MFirst filing | VP & Chief Accounting Officer | Sale | 1,466 | $367K | Feb 23 | SEC ↗ |
Moloney Jacqueline FFirst in 5 months | Director | Sale | 829 | $205K | Feb 23 | SEC ↗ |
Henry David PhilipFirst in 5 months | EVP, Global Str Mktg & GM, MSD | Sale | 2,000 | $523K | Feb 23 | SEC ↗ |
Williams John EdwardFirst filing | EVP & GM, PSD | Sale | 2,042.625 | $524K | Feb 23 | SEC ↗ |
Burke Kathleen FlahertyFirst filing | EVP, GC & Secretary | Sale | 4,254 | $1.1M | Feb 23 | SEC ↗ |
Taranto Eric RobertFirst filing | EVP & GM, VSD | Sale | 1,452.73 | $360K | Feb 23 | SEC ↗ |
CANNONE PETER IIIFirst filing | Director | Sale | 1,250 | $323K | Feb 23 | SEC ↗ |
Mora ElizabethFirst in 3 months | Director | Sale | 300 | $48K | Dec 3 | SEC ↗ |
| EVP & COO | Sale | 711 | $99K | Oct 23 | SEC ↗ | |
Moloney Jacqueline FFirst filing | Director | Sale | 300 | $37K | Oct 2 | SEC ↗ |
Henry David PhilipFirst filing | EVP, Global Str Mktg & GM, MSD | Sale | 5,000 | $650K | Sep 19 | SEC ↗ |
Schreiner James AlanFirst filing | EVP & COO | Sale | 838 | $104K | Sep 19 | SEC ↗ |
Mora ElizabethFirst filing | Director | Sale | 300 | $30K | Sep 3 | SEC ↗ |
Related companies
MKS INC is in the Manufacturing sector.