MKSI MKS Inc.
NASDAQActiveCommon stock
MKSI is the ticker symbol of MKS Inc., which is listed on NASDAQ. The symbol was previously used by MKS Instruments, Inc..
MKSI at a glance
- Symbol
- MKSI
- Company / issuer
- MKS Inc.
- Security type
- Common stock
- Exchange
- NASDAQ
- Status
- Actively traded
- Seen in listing files
- Jan 2015 – present
- Sector
- Industrials
- Industry
- Industrial Machinery/Components
- Country
- United States
- IPO year
- 1999
- Market cap
- $17.4 billion (Sep 2026)
MKSI ticker history
All companies and securities we have recorded under the symbol MKSI, from periodic snapshots of US exchange listing files.
| Name | Security | First seen | Last seen |
|---|---|---|---|
| MKS Instruments, Inc. | Common Stock | Jan 2015 | May 2025 |
| MKS Inc. | Common Stock | May 2025 | present |
MKS Inc. company profile
- Industry (SIC)
- Industrial Instruments For Measurement, Display, and Control
- Headquarters
- Andover, MA
- Incorporated in
- MA
- Fiscal year end
- December 31
- SEC filer category
- Large accelerated filer
- Latest annual report
- 10-K filed 2026-02-24
- Latest interim report
- 10-Q filed 2026-08-06
- SEC CIK
- 1049502
Former company names
- Mks Instruments Inc (until 2025)
Source: SEC EDGAR filer data.
MKSI price chart
Interactive chart provided by TradingView (loads third-party scripts).
Frequently asked questions
What company has the ticker symbol MKSI?
MKSI is the ticker symbol of MKS Inc on NASDAQ.
Is MKSI still trading?
Yes. MKSI appears in the current NASDAQ listings as of Sep 2026.
Which companies have used the ticker MKSI?
Our listing records show MKSI used by: MKS Instruments, Inc.; MKS Inc..
Which exchange is MKSI listed on?
MKSI is listed on NASDAQ.
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