# Mks Inc (MKSI)

> Cited company facts from SEC filings, by Steadybase. Web page: https://steadybase.io/company/mks-inc/ JSON: https://steadybase.io/company/mks-inc.json Checked Nov 10, 2026. Latest filing read: Nov 5, 2026.

## Company

- Legal name: MKS INC
- Ticker: MKSI (Nasdaq)
- SEC CIK: 0001049502
- Industry: Industrial Instruments For Measurement, Display, and Control (SIC 3823)
- Headquarters: Andover, MA
- Fiscal year ends: December 31
- SEC filer category: Large accelerated filer
- Website: mks.com
- LinkedIn: https://www.linkedin.com/company/mks-instruments
- Next earnings date: Feb 3, 2027 (estimated from past 8-K timing)

## Key facts

- Revenue: $3.9B for the fiscal year ended Dec 31, 2025 (10-K filed Feb 24, 2026). Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526066820/0001193125-26-066820-index.html
- Operating income: $528.0M for the fiscal year ended Dec 31, 2025 (10-K filed Feb 24, 2026). Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526066820/0001193125-26-066820-index.html
- Net income: $295.0M for the fiscal year ended Dec 31, 2025 (10-K filed Feb 24, 2026). Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526066820/0001193125-26-066820-index.html
- SG&A: $724.0M for the fiscal year ended Dec 31, 2025 (10-K filed Feb 24, 2026). Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526066820/0001193125-26-066820-index.html
- Employees: 10,300 as of Dec 31, 2025, as reported in an SEC filing. Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526066820/mksi-20251231.htm
- Shares outstanding: 67,620,475 as of Oct 27, 2026 (10-Q filed Nov 5, 2026). Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526449631/0001193125-26-449631-index.html
- Auditor: Pricewaterhousecoopers LLP, Boston, Massachusetts, named in the latest 10-K. Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526066820/mksi-20251231.htm

## Business

, formerly known as MKS Instruments, Inc. (“MKS,” the “Company,” “our,” or “we”), was founded in 1961 as a Massachusetts corporation. We enable technologies that transform our world. We deliver foundational technology solutions to leading edge semiconductor manufacturing, electronics and packaging, and specialty industrial applications.

Source: Item 1. Business, https://www.sec.gov/Archives/edgar/data/1049502/000119312526066820/mksi-20251231.htm

## Annual results

| Fiscal year ended | Revenue | Operating income | Net income | SG&A |
|---|---|---|---|---|
| Dec 31, 2025 | $3.9B | $528.0M | $295.0M | $724.0M |
| Dec 31, 2024 | $3.6B | $498.0M | $190.0M | $674.0M |
| Dec 31, 2023 | $3.6B | -$1.6B | -$1.8B | $675.0M |
| Dec 31, 2022 | $3.5B | $617.0M | $333.0M | $488.0M |
| Dec 31, 2021 | $3.0B | $699.0M | $551.0M | $385.0M |

Each figure comes from the annual report for that year. Filing links for every figure: https://steadybase.io/company/mks-inc.json

## Officers and directors

- John T.C. Lee, President and Chief Executive Officer. LinkedIn: https://linkedin.com/in/john-t-c-lee-ab01846. Source: 8-K filed Nov 4, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000119312526447410/mksi-ex99_1.htm
- John Tseng-Chung Lee, President & CEO. Source: Form 4 filed Aug 17, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000104950226000113/0001049502-26-000113-index.htm
- Ram Mayampurath, Executive Vice President and Chief Financial Officer. Source: 8-K filed Nov 4, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000119312526447410/mksi-ex99_1.htm
- Ramakumar Mayampurath, EVP & CFO. Source: Form 4 filed May 26, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000104950226000090/0001049502-26-000090-index.htm
- James Alan Schreiner, EVP & COO. Source: Form 4 filed Jun 16, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000104950226000109/0001049502-26-000109-index.htm
- Renee Martel Donlan, EVP, GC & CCO. Source: Form 4 filed Aug 18, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000104950226000115/0001049502-26-000115-index.htm
- John Edward Williams, EVP & GM, PSD. Source: Form 4 filed Aug 4, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000104950226000111/0001049502-26-000111-index.htm
- Michelle M. McCarthy, SVP & Chief Accounting Officer. LinkedIn: https://linkedin.com/in/michelle-mccarthy-59184212b. Source: Form 4 filed Jun 8, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000104950226000105/0001049502-26-000105-index.htm
- David Philip Henry, EVP, Global Str Mktg & GM, MSD. Source: Form 4 filed Jun 2, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000104950226000100/0001049502-26-000100-index.htm
- Eric Robert Taranto, EVP & GM, VSD. Source: Form 4 filed May 12, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000104950226000080/0001049502-26-000080-index.htm
- Kathleen Flaherty Burke, EVP, GC & Secretary. Source: Form 4 filed May 12, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000104950226000072/0001049502-26-000072-index.htm
- Gerald G. Colella, Chairman of the Board of Directors. Source: 10-K filed Feb 24, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000119312526066820/mksi-20251231.htm
- Elizabeth A. Mora, Director. Source: 10-K filed Feb 24, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000119312526066820/mksi-20251231.htm
- Jacqueline F. Moloney, Director. Source: 10-K filed Feb 24, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000119312526066820/mksi-20251231.htm
- Joseph B. Donahue, Director. Source: 10-K filed Feb 24, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000119312526066820/mksi-20251231.htm
- Peter J. Cannone III, Director. Source: 10-K filed Feb 24, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000119312526066820/mksi-20251231.htm
- Wissam G. Jabre, Director. Source: 10-K filed Feb 24, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000119312526066820/mksi-20251231.htm
- David P. Henry, Named in proxy. LinkedIn: https://linkedin.com/in/david-henry-3999102. Source: DEF 14A filed Mar 31, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000119312526133378/mksi-20260331.htm
- Kathleen F. Burke, Named in proxy. LinkedIn: https://linkedin.com/in/kathleen-f-burke. Source: DEF 14A filed Mar 31, 2026, https://www.sec.gov/Archives/edgar/data/1049502/000119312526133378/mksi-20260331.htm

## Recent 8-K events

- Nov 4, 2026: Item 2.02, Results of operations and financial condition (earnings release); Item 5.03, Amendments to articles or bylaws; change in fiscal year; Item 7.01, Regulation FD disclosure; Item 8.01, Other events; Item 9.01, Financial statements and exhibits. Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526447410/mksi-20261102.htm
- Oct 19, 2026: Item 8.01, Other events; Item 9.01, Financial statements and exhibits. Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526424709/mksi-20261019.htm
- Aug 5, 2026: Item 2.02, Results of operations and financial condition (earnings release); Item 9.01, Financial statements and exhibits. Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526335274/mksi-20260805.htm
- May 12, 2026: Item 5.02, Departure or appointment of directors or officers; compensation; Item 5.07, Submission of matters to a vote of security holders; Item 9.01, Financial statements and exhibits. Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526219474/d22582d8k.htm
- May 6, 2026: Item 2.02, Results of operations and financial condition (earnings release); Item 9.01, Financial statements and exhibits. Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526209140/mksi-20260506.htm
- Apr 6, 2026: Item 5.02, Departure or appointment of directors or officers; compensation. Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526142945/mksi-20260331.htm
- Feb 17, 2026: Item 2.02, Results of operations and financial condition (earnings release); Item 9.01, Financial statements and exhibits. Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526054841/mksi-20260217.htm
- Feb 5, 2026: Item 1.01, Entry into a material definitive agreement; Item 2.03, Creation of a direct financial obligation; Item 7.01, Regulation FD disclosure; Item 9.01, Financial statements and exhibits. Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526038565/d39268d8k.htm
- Jan 28, 2026: Item 8.01, Other events; Item 9.01, Financial statements and exhibits. Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526027243/d85940d8k.htm
- Jan 21, 2026: Item 2.02, Results of operations and financial condition (earnings release); Item 7.01, Regulation FD disclosure; Item 9.01, Financial statements and exhibits. Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526017468/d61981d8k.htm

## Insider trades (Form 4)

- Sep 1, 2026: Elizabeth Mora (Director) sold 300 shares, about $75,288. Source: https://www.sec.gov/Archives/edgar/data/1049502/000104950226000119/0001049502-26-000119-index.htm
- Aug 14, 2026: John Tseng-Chung Lee (President & CEO) sold 10,000 shares, about $3.0M. Source: https://www.sec.gov/Archives/edgar/data/1049502/000104950226000113/0001049502-26-000113-index.htm
- Aug 3, 2026: John Edward Williams (EVP & GM, PSD) sold 457 shares, about $131,758. Source: https://www.sec.gov/Archives/edgar/data/1049502/000104950226000111/0001049502-26-000111-index.htm
- Jun 12, 2026: James Alan Schreiner (EVP & COO) sold 3,500 shares, about $1.2M. Source: https://www.sec.gov/Archives/edgar/data/1049502/000104950226000109/0001049502-26-000109-index.htm
- Jun 10, 2026: James Alan Schreiner (EVP & COO) sold 781 shares, about $247,905. Source: https://www.sec.gov/Archives/edgar/data/1049502/000104950226000107/0001049502-26-000107-index.htm
- Jun 5, 2026: Michelle M. McCarthy (SVP & Chief Accounting Officer) sold 2,434 shares, about $767,270. Source: https://www.sec.gov/Archives/edgar/data/1049502/000104950226000105/0001049502-26-000105-index.htm
- Jun 1, 2026: David Philip Henry (EVP, Global Str Mktg & GM, MSD) sold 6,000 shares, about $1.9M. Source: https://www.sec.gov/Archives/edgar/data/1049502/000104950226000100/0001049502-26-000100-index.htm
- Jun 1, 2026: Elizabeth Mora (Director) sold 300 shares, about $95,406. Source: https://www.sec.gov/Archives/edgar/data/1049502/000104950226000098/0001049502-26-000098-index.htm
- May 27, 2026: Joseph B. Donahue (Director) sold 2,100 shares, about $688,695. Source: https://www.sec.gov/Archives/edgar/data/1049502/000104950226000096/0001049502-26-000096-index.htm
- May 27, 2026: Gerald G. Colella (Director) sold 20,000 shares, about $6.7M. Source: https://www.sec.gov/Archives/edgar/data/1049502/000104950226000094/0001049502-26-000094-index.htm
- May 26, 2026: David Philip Henry (EVP, Global Str Mktg & GM, MSD) sold 2,500 shares, about $826,250. Source: https://www.sec.gov/Archives/edgar/data/1049502/000104950226000092/0001049502-26-000092-index.htm
- May 22, 2026: Ramakumar Mayampurath (EVP & CFO) sold 8,810 shares, about $2.8M. Source: https://www.sec.gov/Archives/edgar/data/1049502/000104950226000090/0001049502-26-000090-index.htm
- May 22, 2026: John Tseng-Chung Lee (President & CEO) sold 10,000 shares, about $3.2M. Source: https://www.sec.gov/Archives/edgar/data/1049502/000104950226000088/0001049502-26-000088-index.htm
- May 18, 2026: Peter Cannone Iii (Director) sold 1,350 shares, about $409,590. Source: https://www.sec.gov/Archives/edgar/data/1049502/000104950226000086/0001049502-26-000086-index.htm
- May 14, 2026: Jacqueline F. Moloney (Director) sold 1,000 shares, about $312,200. Source: https://www.sec.gov/Archives/edgar/data/1049502/000104950226000084/0001049502-26-000084-index.htm

## What management said

- "Our business momentum continued to build in the third quarter. Revenue in each of our end markets was at or above the high end of our guidance, led by 54% year-over-year growth in Semiconductor and 43% growth in Electronics & Packaging" John T.C. Lee, President and Chief Executive Officer (8-K filed Nov 4, 2026). Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526447410/mksi-ex99_1.htm
- "Q3 performance exceeded the high end of our guidance ranges for revenue and EPS, and we’re poised for a strong finish to 2026" Ram Mayampurath, Executive Vice President and Chief Financial Officer (8-K filed Nov 4, 2026). Source: https://www.sec.gov/Archives/edgar/data/1049502/000119312526447410/mksi-ex99_1.htm

## Latest filings

- 8-K filed Oct 19, 2026: https://www.sec.gov/Archives/edgar/data/1049502/000119312526424709/mksi-20261019.htm
- 10-K filed Feb 24, 2026: https://www.sec.gov/Archives/edgar/data/1049502/000119312526066820/mksi-20251231.htm
- 10-Q filed Aug 6, 2026: https://www.sec.gov/Archives/edgar/data/1049502/000119312526337821/mksi-20260630.htm
- DEF 14A filed Mar 31, 2026: https://www.sec.gov/Archives/edgar/data/1049502/000119312526133378/mksi-20260331.htm

## About this data

SEC EDGAR filings, read by Steadybase. Every value links to the filing it came from.
Steadybase covers US-headquartered public companies that file with the SEC. API and MCP access: https://steadybase.io/docs/