Companies / MKS Inc
MKS Inc
Nasdaq: MKSICIK 1049502ANDOVER, MA
Financials · FY2025
Ownership
67.6M shares outstanding · as of Jul 28, 2026
Ownership
| Insiders | 0.50% | 337,172 |
| 10%+ / strategic | 18.08% | 12,226,758 |
| Institutions | 97.41% | 65,866,961 |
| Public float | 0.00% | 0 |
Reported holdings exceed shares outstanding — public float shown as 0; some positions may overlap or lag.
% of common shares outstanding (exact, from the latest cover-page filing). Institutions are quarterly 13F snapshots; insiders reflect current officers & directors.
Insiders 16
View all →| Insider | % of shares | Shares |
|---|---|---|
Lee John Tseng-ChungCEOPresident & CEO · Director | 0.21% | 144,696 |
Burke Kathleen FlahertyEVP, GC & Secretary | 0.07% | 49,439 |
Colella Gerald GDirector | 0.04% | 29,016 |
Schreiner James AlanEVP & COO | 0.03% | 19,201 |
Mora ElizabethDirector | 0.03% | 19,145 |
Batra RajDirector | 0.02% | 16,227 |
Taranto Eric RobertEVP & GM, VSD | 0.02% | 12,596 |
Henry David PhilipEVP, Global Str Mktg & GM, MSD | 0.02% | 10,422 |
Donahue Joseph BDirector | 0.01% | 10,033 |
Moloney Jacqueline FDirector | 0.01% | 8,775 |
Institutional holders 548
View all →| Holder | Value | % of shares |
|---|---|---|
| $3.08B | 10.25% | |
| $1.20B | 11.07% | |
| $949.44M | 3.16% | |
| $616.11M | 5.70% | |
| $517.63M | 4.79% | |
| $511.09M | 4.73% | |
| $407.81M | 3.77% | |
| $353.82M | 2.28% | |
| $300.30M | 1.93% | |
| $270.90M | 0.90% |
Activity
InsidersInstitutions
What insiders are doing in this stock (Form 4).| Date | Actor | Action | Security | Value | Shares Δ | Position after | Impact |
|---|---|---|---|---|---|---|---|
| Feb 17, 2026 | Lee John Tseng-Chung CEO | Other | Common Stock | $8.49M | -33K -14.98% | 184,696 0.27% of shares | low |
| Feb 20, 2026 | Lee John Tseng-Chung CEO | Sell | Common Stock | $3.41M | -13K -7.21% | 171,386 0.25% of shares | medium |
| Feb 20, 2026 | Lee John Tseng-Chung CEO | Sell | Common Stock | $3.29M | -13K -7.48% | 158,574 0.23% of shares | medium |
| May 22, 2026 | Lee John Tseng-Chung CEO | Sell | Common Stock | $3.15M | -10K -6.46% | 144,696 0.21% of shares | medium |
| May 22, 2026 | Mayampurath Ramakumar Executive | Sell | Common Stock | $2.78M | -9K -99.99% | 1 <0.01% of shares | medium |
| May 27, 2026 | Colella Gerald G Director | Sell | Common Stock | $2.72M | -8K -20.76% | 31,343 0.05% of shares | medium |
| Feb 24, 2026 | Colella Gerald G Director | Sell | Common Stock | $2.54M | -10K -19.99% | 40,017 0.06% of shares | medium |
| Feb 20, 2026 | Colella Gerald G Director | Sell | Common Stock | $2.53M | -10K -16.66% | 50,017 0.07% of shares | medium |
5%+ ownership events
Schedule 13D / 13G
| Filer | Stance | % of class |
|---|---|---|
| Vanguard Group Inc | Passive13G/A | — |
| T. Rowe Price Associates, Inc. | Passive13G/A | — |
| Invesco Ltd. | Passive13G | — |
| Fmr LLC | Passive13G/A | — |
| Vanguard Portfolio Management | Passive13G | — |
| Vanguard Capital Management | Passive13G | — |
Securities
via CUSIP / OpenFIGI
| Symbol | Type | CUSIP |
|---|---|---|
| MKSI | — | 55306N104 |