Mks Inc.
- MKSI · Nasdaq
- Industrial Instruments For Measurement, Display, and Control
- Andover, MA
- 10,300 employees
- CIK 0001049502
Updated from SEC filings through
Top things to know
Executives
-
John T.C. Lee President and Chief Executive Officer 8-K, 2026-11-04 - John Tseng-Chung Lee President & CEO 4, 2026-08-17
- Ram Mayampurath Executive Vice President and Chief Financial Officer 8-K, 2026-11-04
-
Ramakumar Mayampurath EVP & CFO 4, 2026-05-26 - Michelle M. McCarthy SVP & Chief Accounting Officer 4, 2026-06-08
- Renee Martel Donlan EVP, GC & CCO 4, 2026-08-18
What leadership is saying
“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”
Earnings press release (8-K Ex. 99.1), filed November 4, 2026
Mks Inc is a U.S. public company in industrial instruments for measurement, display, and control (SIC 3823), headquartered in Andover, MA. It trades as MKSI on Nasdaq. Revenue was $3.9B in the fiscal year ending December 31, 2025, +9.6% from the year before. It reported about 10,300 employees. John T.C. Lee is President and Chief Executive Officer.
Five-year financials
| Metric | FY2025 | FY2024 | FY2023 | FY2022 | FY2021 |
|---|---|---|---|---|---|
| Revenue | $3.9B 10-K, 2026-02-24 | $3.6B 10-K, 2026-02-24 | $3.6B 10-K, 2026-02-24 | $3.5B 10-K, 2025-02-25 | $3.0B 10-K, 2024-02-27 |
| Operating income | $528M 10-K, 2026-02-24 | $498M 10-K, 2026-02-24 | -$1.6B 10-K, 2026-02-24 | $617M 10-K, 2025-02-25 | $699M 10-K, 2024-02-27 |
| SG&A | $724M 10-K, 2026-02-24 | $674M 10-K, 2026-02-24 | $675M 10-K, 2026-02-24 | $488M 10-K, 2025-02-25 | $385M 10-K, 2024-02-27 |
| Net income | $295M 10-K, 2026-02-24 | $190M 10-K, 2026-02-24 | -$1.8B 10-K, 2026-02-24 | $333M 10-K, 2025-02-25 | $551M 10-K, 2024-02-27 |
Annual figures from XBRL in each company's own filings. Click a figure to open the filing. SG&A marked derived is general and administrative plus selling and marketing.
Leadership and board
| Name | Title | Source |
|---|---|---|
| John T.C. Lee President & Chief Executive Officer at MKS Inc. | President and Chief Executive Officer | 8-K, 2026-11-04 |
| John Tseng-Chung Lee | President & CEO | 4, 2026-08-17 |
| Ram Mayampurath | Executive Vice President and Chief Financial Officer | 8-K, 2026-11-04 |
| Ramakumar Mayampurath | EVP & CFO | 4, 2026-05-26 |
| Michelle M. McCarthy Senior Vice President, Chief Accounting Officer at MKS Inc | SVP & Chief Accounting Officer | 4, 2026-06-08 |
 David P. Henry Executive Vice President Global Strategic Marketing & General Manager Materials Solutions Division | Named in proxy bio: Executive Vice President, Global Strategic Marketing, and General Manager, Materials Solutions Division | DEF 14A, 2026-03-31 |
| Kathleen F. Burke Seasoned Executive with 30 years experience in corporate governance, risk management, compliance, and M&A. EVP/GC of MKS Instruments. Strong communications and | Named in proxy bio: Executive Vice President, General Counsel, and Secretary | DEF 14A, 2026-03-31 |
| Renee Martel Donlan | EVP, GC & CCO | 4, 2026-08-18 |
| John Edward Williams | EVP & GM, PSD | 4, 2026-08-04 |
| James Alan Schreiner | EVP & COO | 4, 2026-06-16 |
| David Philip Henry | EVP, Global Str Mktg & GM, MSD | 4, 2026-06-02 |
| Eric Robert Taranto | EVP & GM, VSD | 4, 2026-05-12 |
| Kathleen Flaherty Burke | EVP, GC & Secretary | 4, 2026-05-12 |
| Gerald G. Colella | Chairman of the Board of Directors | 10-K, 2026-02-24 |
| Elizabeth A. Mora | Director | 10-K, 2026-02-24 |
| Jacqueline F. Moloney | Director | 10-K, 2026-02-24 |
What Mks Inc does
, 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.
Item 1. Business, 10-K for the year ending December 31, 2025
Shares and governance
| Shares outstanding | 67.6 million (as of October 27, 2026) | 10-Q, November 5, 2026 |
|---|---|---|
| Public float | $6.7B (as of June 30, 2025) | 10-K, February 24, 2026 |
| Reportable segments | 3 (period ending September 30, 2026) | 10-Q, November 5, 2026 |
| Latest proxy statement | Meeting May 11, 2026 (filed March 31, 2026) | DEF 14A, March 31, 2026 |
| Auditor | PricewaterhouseCoopers LLP (Boston, Massachusetts) | Latest 10-K |
Insider trades
Open-market buys and sales by officers and directors, from Forms 4 and 5. One row per filing.
| Date | Insider | Trade | Shares | Value | Source |
|---|---|---|---|---|---|
| September 1, 2026 | Elizabeth Mora Director | Sale | 300 | $75K | Form 4, September 2, 2026 |
| August 14, 2026 | John Tseng-Chung Lee President & CEO | Sale | 10,000 | $3.0M | Form 4, August 17, 2026 |
| August 3, 2026 | John Edward Williams EVP & GM, PSD | Sale | 457 | $132K | Form 4, August 4, 2026 |
| June 12, 2026 | James Alan Schreiner EVP & COO | Sale | 3,500 | $1.2M | Form 4, June 16, 2026 |
| June 10, 2026 | James Alan Schreiner EVP & COO | Sale | 781 | $248K | Form 4, June 11, 2026 |
| June 5, 2026 | Michelle M. McCarthy SVP & Chief Accounting Officer | Sale | 2,434 | $767K | Form 4, June 8, 2026 |
| June 1, 2026 | David Philip Henry EVP, Global Str Mktg & GM, MSD | Sale | 6,000 | $1.9M | Form 4, June 2, 2026 |
| June 1, 2026 | Elizabeth Mora Director | Sale | 300 | $95K | Form 4, June 2, 2026 |
Recent 8-K events
- 8-K filed 2026-11-04
- 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
- 8-K filed 2026-10-19
- Item 8.01 Other events
- 8-K filed 2026-08-05
- Item 2.02 Results of operations and financial condition (earnings release)
- 8-K filed 2026-05-12
- Item 5.02 Departure or appointment of directors or officers; compensation
- Item 5.07 Submission of matters to a vote of security holders
- 8-K filed 2026-05-06
- Item 2.02 Results of operations and financial condition (earnings release)
- 8-K filed 2026-04-06
- Item 5.02 Departure or appointment of directors or officers; compensation
- 8-K filed 2026-02-17
- Item 2.02 Results of operations and financial condition (earnings release)
- 8-K filed 2026-02-05
- Item 1.01 Entry into a material definitive agreement
- Item 2.03 Creation of a direct financial obligation
- Item 7.01 Regulation FD disclosure
- 8-K filed 2026-01-28
- Item 8.01 Other events
- 8-K filed 2026-01-21
- Item 2.02 Results of operations and financial condition (earnings release)
- Item 7.01 Regulation FD disclosure
Frequently asked questions about Mks Inc
- What does Mks Inc do?
- In its own words, from Item 1 of its 10-K: ", 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."
- What is Mks Inc's revenue?
- $3.9B for the fiscal year ending December 31, 2025, from its 10-K filed February 24, 2026.
- Is Mks Inc profitable?
- Mks Inc reported net income of $295M for the fiscal year ending December 31, 2025.
- How many employees does Mks Inc have?
- About 10,300 as of December 31, 2025, as stated in its annual report.
- Who is the CEO of Mks Inc?
- John T.C. Lee, President and Chief Executive Officer, as named in a 8-K filed November 4, 2026.
- Who is the CFO of Mks Inc?
- Ram Mayampurath, Executive Vice President and Chief Financial Officer, as named in a 8-K filed November 4, 2026.
- Where is Mks Inc headquartered?
- Andover, MA.
- What is Mks Inc's stock ticker?
- MKSI on Nasdaq.
- What industry is Mks Inc in?
- Industrial Instruments For Measurement, Display, and Control, SIC code 3823.
- What is Mks Inc's website?
- mks.com.
- When does Mks Inc report earnings next?
- February 3, 2027. Source: estimate_8k_pattern.
- Is Mks Inc a public company?
- Yes. Mks Inc files with the SEC under CIK 0001049502 and trades as MKSI.
- Who audits Mks Inc?
- PricewaterhouseCoopers LLP, Boston, Massachusetts, as named in its latest annual report (10-K).
- How many shares of Mks Inc are outstanding?
- 67.6 million shares as of October 27, 2026, from its 10-Q filed November 5, 2026.
- What is Mks Inc's public float?
- $6.7B as of June 30, 2025, as reported on the cover of its 10-K filed February 24, 2026.
- How many business segments does Mks Inc report?
- 3 reportable segments for the period ending September 30, 2026, from its 10-Q filed November 5, 2026.
- When is Mks Inc's annual shareholder meeting?
- May 11, 2026, per its proxy statement (DEF 14A) filed March 31, 2026.
- Have Mks Inc insiders traded stock recently?
- Since July 3, 2025, officers and directors reported 40 open-market sales worth about $44.7M and 0 purchases on Forms 4 and 5. The most recent: Elizabeth Mora (Director) sold 300 shares on September 1, 2026.