As of November 6, 2026, MKS Inc. is a publicly traded company (Nasdaq: MKSI); its largest reported holder is BlackRock, with 8.8% on Schedule 13G/A of October 17, 2025, then Invesco (6.5%). The largest insider holding is Lee John Tseng-Chung, the chief executive and president, with 134,776.267 shares (0.20% of shares outstanding), per Form 4 of November 3, 2026 (Schedule 13G/A, October 17, 2025).
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Is MKS Inc. a real, registered company?
- Mks Inc. files with the SEC under CIK 1049502 (its SEC filings).
- Its shares are listed under the ticker MKSI on Nasdaq (SEC company record).
- Incorporated in Massachusetts; business address in Andover, Massachusetts, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under MKS INC. in our court records and SEC 8-K records (as of 2026-11-06).
- Leadership changes: the latest reported is Kathleen F. Burke, Executive Vice President, General Counsel and Secretary (Form 8-K filed 2026-04-06). Check you are dealing with the people now in charge.
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names JPMorgan Chase (filed 2026-07-16).
Who are MKS Inc.'s owners and officers?
MKS Inc.: incorporated in Massachusetts; business address in Andover, Massachusetts; industry Industrial Instruments For Measurement, Display, and Control (Schedule 13G/A, 2026-09-03).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-09-03 | Jpmorgan Chase & Co. | 2.9% |
| Schedule 13G/A, 2026-07-24 | Victory Capital Management, Inc. | 0.9% |
| Schedule 13G, 2026-07-16 | Jpmorgan Chase & Co | 5% |
| Schedule 13G/A, 2026-05-06 | Fmr LLC | 3.3% |
| Schedule 13G, 2026-04-30 | Vanguard Capital Management | 5.24% |
| Schedule 13G, 2026-04-29 | Vanguard Portfolio Management | 5.49% |
| Schedule 13G/A, 2026-03-27 | The Vanguard Group | 0% |
| Schedule 13G/A, 2026-02-17 | T. Rowe Price Associates, Inc. | 4.1% |
| Schedule 13G, 2026-02-12 | Invesco LTD. | 6.5% |
| Schedule 13G/A, 2025-10-31 | The Vanguard Group | 11.54% |
| Schedule 13G/A, 2025-10-17 | Blackrock, Inc. | 8.8% |
| Schedule 13G/A, 2025-08-14 | T. Rowe Price Associates, Inc. | 6.2% |
Questions about who owns MKS Inc.
Who owns MKS Inc.?
On this page, 5 holders' latest ownership filings report 5% or more of MKS Inc.: Blackrock, Inc. (8.8%, Schedule 13G/A, filed 2025-10-17), Invesco LTD. (6.5%, Schedule 13G, filed 2026-02-12), Vanguard Portfolio Management (5.49%, Schedule 13G, filed 2026-04-29), Vanguard Capital Management (5.24%, Schedule 13G, filed 2026-04-30) and Jpmorgan Chase & Co (5%, Schedule 13G, filed 2026-07-16).
Who are the largest shareholders of MKS Inc.?
By the share each holder's latest filing reports, the largest holders of MKS Inc. on this page are Blackrock, Inc. (8.8%), Invesco LTD. (6.5%) and Vanguard Portfolio Management (5.49%).
When did Blackrock, Inc. buy into MKS Inc.?
The filings give report dates, not purchase dates. The earliest filing from Blackrock, Inc. on this page is the Schedule 13G/A, filed 2025-10-17, reporting 8.8%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 12 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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What the Full Report on MKS Inc. covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
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| Filed | Person | Role | Change | Effective |
|---|---|---|---|---|
| Form 8-K, 2026-04-06 | Kathleen F. Burke | Executive Vice President, General Counsel and Secretary | departed | 2026-06-01 |
Which insiders own MKS Inc. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , the chief executive and president: 134,776.267 shares (0.20% of shares outstanding) (Form 4, 2026-11-03).
- , the general counsel and executive vice president: 49,439.49 shares (0.07% of shares outstanding) (Form 4, 2026-05-12).
- , a director: 29,015.89 shares (0.04% of shares outstanding), 8,998.89 held directly and 20,017 indirectly (Form 4, 2026-05-28).
- , the chief operating officer and executive vice president: 19,201.12 shares (0.03% of shares outstanding) (Form 4, 2026-06-16).
- , a director: 18,845.35 shares (0.03% of shares outstanding) (Form 4, 2026-09-02).
Shares outstanding: 67,620,475 as of 2026-10-27, from the company's latest SEC cover page.
How much has MKS Inc. raised?
No fundraising or offering filing from MKS Inc. is on file with us.
Keep reading
More on MKS Inc. and the records around it.
MKS Inc. elsewhere on the record
- 5%+ stake filings Sep 2026
Companies that share a holder
- Victory Capital Management, Inc. also filed stake reports on 41 other companies: Angel Oak Mortgage REIT, Inc. (Nov 2026), Bowhead Specialty Holdings Inc. (Jul 2026), Dole plc (Jul 2026)
- Invesco Ltd. also filed stake reports on 83 other companies: Alignment Healthcare Inc (Aug 2026), ArcBest Corp (Aug 2026), ARKO Petroleum Corp (Aug 2026)
- JPMORGAN CHASE & CO also filed stake reports on 116 other companies: LEVI STRAUSS & CO (Nov 2026), Warner Music Group Corp. (Nov 2026), Andersen Group Inc. (Oct 2026)
Related pages
Filings, cases and notices link to their records. A not-found line names the records searched; it is not proof of absence.
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