MKS Inc SEC filings MKSI
MKS Inc has 1,001 filings in SEC EDGAR's recent list, going back to Nov 5, 2014. Its latest annual report, Form ARS, was filed on Mar 31, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 5, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Nov 4, 2026 (results of operations, bylaw or fiscal year change, regulation fd disclosure, other events). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 10-Q | Quarterly report | Nov 5, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Results of operations, Bylaw or fiscal year change, Regulation FD disclosure, Other events
|
Nov 4, 2026 | Nov 2, 2026 |
| 4 | Insider transaction | Nov 3, 2026 | Oct 30, 2026 |
| 8-K |
Current report
Other events
|
Oct 19, 2026 | Oct 19, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Sep 3, 2026 | — |
| 4 | Insider transaction | Sep 2, 2026 | Sep 1, 2026 |
| 144 | Notice of proposed sale | Sep 1, 2026 | — |
| 4 | Insider transaction | Aug 18, 2026 | Aug 17, 2026 |
| 4 | Insider transaction | Aug 17, 2026 | Aug 14, 2026 |
| 144 | Notice of proposed sale | Aug 14, 2026 | — |
| 10-Q | Quarterly report | Aug 6, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 5, 2026 | Aug 5, 2026 |
| 4 | Insider transaction | Aug 4, 2026 | Aug 3, 2026 |
| 144 | Notice of proposed sale | Aug 3, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 24, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 16, 2026 | — |
| 4 | Insider transaction | Jun 16, 2026 | Jun 12, 2026 |
| 144 | Notice of proposed sale | Jun 12, 2026 | — |
| 4 | Insider transaction | Jun 11, 2026 | Jun 10, 2026 |
| 144 | Notice of proposed sale | Jun 10, 2026 | — |
| 4 | Insider transaction | Jun 8, 2026 | Jun 5, 2026 |
| 144 | Notice of proposed sale | Jun 5, 2026 | — |
| 3 | Initial insider ownership | Jun 4, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 2, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 2, 2026 | Jun 1, 2026 |
| 144 | Notice of proposed sale | Jun 1, 2026 | — |
| 144 | Notice of proposed sale | Jun 1, 2026 | — |
| SD | Specialized disclosure (conflict minerals) | May 28, 2026 | — |
| 4 | Insider transaction | May 28, 2026 | May 27, 2026 |
| 4 | Insider transaction | May 28, 2026 | May 27, 2026 |
| 4 | Insider transaction | May 27, 2026 | May 26, 2026 |
| 144 | Notice of proposed sale | May 27, 2026 | — |
| 144 | Notice of proposed sale | May 27, 2026 | — |
| 4 | Insider transaction | May 26, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 26, 2026 | May 22, 2026 |
| 144 | Notice of proposed sale | May 26, 2026 | — |
| 144 | Notice of proposed sale | May 22, 2026 | — |
| 144 | Notice of proposed sale | May 22, 2026 | — |
| 4 | Insider transaction | May 19, 2026 | May 18, 2026 |
| 144 | Notice of proposed sale | May 18, 2026 | — |
| 4 | Insider transaction | May 15, 2026 | May 14, 2026 |
| 144 | Notice of proposed sale | May 14, 2026 | — |
| 4 | Insider transaction | May 14, 2026 | May 13, 2026 |
| 144 | Notice of proposed sale | May 13, 2026 | — |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 12, 2026 | May 11, 2026 |
| 4 | Insider transaction | May 12, 2026 | May 11, 2026 |
| 4 | Insider transaction | May 12, 2026 | May 11, 2026 |
| 4 | Insider transaction | May 12, 2026 | May 11, 2026 |
| 4 | Insider transaction | May 12, 2026 | May 11, 2026 |
| 4 | Insider transaction | May 12, 2026 | May 11, 2026 |
| 4 | Insider transaction | May 12, 2026 | May 11, 2026 |
| 4 | Insider transaction | May 12, 2026 | May 11, 2026 |
| 4 | Insider transaction | May 12, 2026 | May 11, 2026 |
| 4 | Insider transaction | May 12, 2026 | May 11, 2026 |
| 144 | Notice of proposed sale | May 11, 2026 | — |
| 144 | Notice of proposed sale | May 11, 2026 | — |
| S-8 | Employee stock plan registration | May 11, 2026 | — |
| 10-Q | Quarterly report | May 7, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 6, 2026 | May 6, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 6, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 30, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 29, 2026 | — |
| 4 | Insider transaction | Apr 20, 2026 | Apr 17, 2026 |
| 4 | Insider transaction | Apr 16, 2026 | Apr 15, 2026 |
| 8-K |
Current report
Officer or director change
|
Apr 6, 2026 | Mar 31, 2026 |
| ARS | Annual report to shareholders | Mar 31, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Mar 31, 2026 | — |
| DEF 14A | Proxy statement | Mar 31, 2026 | May 11, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 27, 2026 | — |
| PRE 14A | Preliminary proxy statement | Mar 20, 2026 | May 11, 2026 |
| 4 | Insider transaction | Mar 13, 2026 | Mar 12, 2026 |
| 144 | Notice of proposed sale | Mar 12, 2026 | — |
| 4 | Insider transaction | Mar 9, 2026 | Mar 6, 2026 |
| 144 | Notice of proposed sale | Mar 6, 2026 | — |
| 4 | Insider transaction | Mar 3, 2026 | Mar 2, 2026 |
| 144 | Notice of proposed sale | Mar 2, 2026 | — |
| 4 | Insider transaction | Feb 25, 2026 | Feb 24, 2026 |
| 10-K | Annual report | Feb 24, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 20, 2026 |
| 144 | Notice of proposed sale | Feb 24, 2026 | — |
| 4 | Insider transaction | Feb 23, 2026 | Feb 20, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 20, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 20, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 20, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 20, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 20, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 20, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 20, 2026 |
| 144 | Notice of proposed sale | Feb 20, 2026 | — |
| 144 | Notice of proposed sale | Feb 20, 2026 | — |
| 144 | Notice of proposed sale | Feb 20, 2026 | — |
| 144 | Notice of proposed sale | Feb 20, 2026 | — |
| 144 | Notice of proposed sale | Feb 20, 2026 | — |
| 144 | Notice of proposed sale | Feb 20, 2026 | — |
| 144 | Notice of proposed sale | Feb 20, 2026 | — |
| 144 | Notice of proposed sale | Feb 20, 2026 | — |
| 144 | Notice of proposed sale | Feb 20, 2026 | — |
| 4 | Insider transaction | Feb 18, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 17, 2026 |
| 8-K |
Current report
Results of operations
|
Feb 17, 2026 | Feb 17, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 17, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 12, 2026 | — |
| 4 | Insider transaction | Feb 9, 2026 | Feb 8, 2026 |
| 4 | Insider transaction | Feb 9, 2026 | Feb 8, 2026 |
| 4 | Insider transaction | Feb 9, 2026 | Feb 8, 2026 |
| 4 | Insider transaction | Feb 9, 2026 | Feb 8, 2026 |
| 4 | Insider transaction | Feb 9, 2026 | Feb 8, 2026 |
| 4 | Insider transaction | Feb 9, 2026 | Feb 8, 2026 |
| 4 | Insider transaction | Feb 9, 2026 | Feb 8, 2026 |
| 8-K |
Current report
Material agreement, New debt, Regulation FD disclosure
|
Feb 5, 2026 | Feb 4, 2026 |
| 8-K |
Current report
Other events
|
Jan 28, 2026 | Jan 26, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jan 21, 2026 | Jan 21, 2026 |
| 4 | Insider transaction | Dec 3, 2025 | Dec 2, 2025 |
| 144 | Notice of proposed sale | Dec 2, 2025 | — |
| 4 | Insider transaction | Nov 18, 2025 | Nov 17, 2025 |
| 10-Q | Quarterly report | Nov 6, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2025 | Nov 5, 2025 |
| 4 | Insider transaction | Nov 4, 2025 | Oct 31, 2025 |
| 4 | Insider transaction | Nov 4, 2025 | Oct 31, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 31, 2025 | — |
| 4 | Insider transaction | Oct 23, 2025 | Oct 22, 2025 |
| 144 | Notice of proposed sale | Oct 22, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 17, 2025 | — |
| 4 | Insider transaction | Oct 2, 2025 | Oct 1, 2025 |
| 144 | Notice of proposed sale | Oct 1, 2025 | — |
| 4 | Insider transaction | Sep 19, 2025 | Sep 18, 2025 |
| 4 | Insider transaction | Sep 19, 2025 | Sep 18, 2025 |
| 144 | Notice of proposed sale | Sep 18, 2025 | — |
| 144 | Notice of proposed sale | Sep 18, 2025 | — |
| 4 | Insider transaction | Sep 3, 2025 | Sep 2, 2025 |
| 144 | Notice of proposed sale | Sep 2, 2025 | — |
| 4 | Insider transaction | Aug 19, 2025 | Aug 18, 2025 |
| 4 | Insider transaction | Aug 18, 2025 | Aug 15, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 8, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 8, 2025 | — |
| 10-Q | Quarterly report | Aug 7, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2025 | Aug 6, 2025 |
| 4 | Insider transaction | Aug 5, 2025 | Aug 4, 2025 |
| 4 | Insider transaction | Aug 4, 2025 | Aug 1, 2025 |
| 144 | Notice of proposed sale | Aug 1, 2025 | — |
| 4 | Insider transaction | Jul 8, 2025 | Jul 7, 2025 |
| 4 | Insider transaction | Jul 7, 2025 | Jul 3, 2025 |
| 144 | Notice of proposed sale | Jul 7, 2025 | — |
| 144 | Notice of proposed sale | Jul 3, 2025 | — |
| 4 | Insider transaction | Jun 3, 2025 | Jun 2, 2025 |
| 144 | Notice of proposed sale | Jun 2, 2025 | — |
| SD | Specialized disclosure (conflict minerals) | May 29, 2025 | — |
| 8-K |
Current report
Change to shareholder rights, Officer or director change, Bylaw or fiscal year change, Shareholder vote results, Regulation FD disclosure
|
May 15, 2025 | May 12, 2025 |
| 4 | Insider transaction | May 13, 2025 | May 12, 2025 |
| 4 | Insider transaction | May 13, 2025 | May 12, 2025 |
| 4 | Insider transaction | May 13, 2025 | May 12, 2025 |
| 4 | Insider transaction | May 13, 2025 | May 12, 2025 |
| 4 | Insider transaction | May 13, 2025 | May 12, 2025 |
| 4 | Insider transaction | May 13, 2025 | May 12, 2025 |
| 4 | Insider transaction | May 13, 2025 | May 12, 2025 |
| 10-Q | Quarterly report | May 8, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 7, 2025 | May 7, 2025 |
| 4 | Insider transaction | Apr 18, 2025 | Apr 17, 2025 |
| 4 | Insider transaction | Apr 17, 2025 | Apr 15, 2025 |
| ARS | Annual report to shareholders | Apr 1, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Apr 1, 2025 | — |
| DEF 14A | Proxy statement | Apr 1, 2025 | May 12, 2025 |
| PRE 14A | Preliminary proxy statement | Mar 21, 2025 | May 12, 2025 |
| 4 | Insider transaction | Mar 4, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Mar 4, 2025 | Mar 3, 2025 |
| 144 | Notice of proposed sale | Mar 3, 2025 | — |
| 144 | Notice of proposed sale | Mar 3, 2025 | — |
| 10-K | Annual report | Feb 25, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Feb 19, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 19, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 19, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 19, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 19, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 19, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 19, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 19, 2025 | Feb 18, 2025 |
| 144 | Notice of proposed sale | Feb 18, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 14, 2025 | — |
| 8-K |
Current report
Results of operations
|
Feb 12, 2025 | Feb 12, 2025 |
| 4 | Insider transaction | Feb 11, 2025 | Feb 10, 2025 |
| 4 | Insider transaction | Feb 11, 2025 | Feb 10, 2025 |
| 4 | Insider transaction | Feb 11, 2025 | Feb 10, 2025 |
| 4 | Insider transaction | Feb 11, 2025 | Feb 10, 2025 |
| 4 | Insider transaction | Feb 11, 2025 | Feb 10, 2025 |
| 4 | Insider transaction | Feb 11, 2025 | Feb 10, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 7, 2025 | — |
| 8-K |
Current report
Material agreement, New debt, Regulation FD disclosure
|
Jan 24, 2025 | Jan 24, 2025 |
| 4 | Insider transaction | Dec 11, 2024 | Dec 10, 2024 |
| 4 | Insider transaction | Dec 10, 2024 | Dec 6, 2024 |
| 144 | Notice of proposed sale | Dec 10, 2024 | — |
| 4 | Insider transaction | Dec 3, 2024 | Dec 2, 2024 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Dec 3, 2024 | Dec 2, 2024 |
| 144 | Notice of proposed sale | Dec 2, 2024 | — |
| 4 | Insider transaction | Nov 18, 2024 | Nov 15, 2024 |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
Company profile
- Industry
- Industrial Instruments For Measurement, Display, and Control (SIC 3823)
- Listed as
- MKSI (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- MA
- Headquarters
- Andover, MA
- SEC filer status
- Large accelerated filer
- SEC CIK
- 1049502
- Former names
- MKS INSTRUMENTS INC (until May 15, 2025)
Other Industrial Instruments For Measurement, Display, and Control companies
- Danaher Corp /DE/ DHR
- Ametek INC/ AME
- Keysight Technologies, Inc. KEYS
- Roper Technologies Inc ROP
- Fortive Corp FTV
- Cognex Corp CGNX
- Ralliant Corp RAL
- Sensata Technologies Holding plc ST
All 18 Industrial Instruments For Measurement, Display, and Control companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.