Mks Inc. has 14 Schedule 13D or 13G filings on record since 2025-08-08. 4 holders' latest filing reports 5% or more of common stock, no par value. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| BlackRock, Inc. | 8.8% | 5,887,663 | SCHEDULE 13G/A, 2025-10-17 | 2025-09-30 |
| Invesco Ltd. | 6.5% | 4,394,205 | SCHEDULE 13G, 2026-02-12 | 2025-12-31 |
| Vanguard Portfolio Management | 5.49% | 3,700,062 | SCHEDULE 13G, 2026-04-29 | 2026-03-31 |
| Vanguard Capital Management | 5.24% | 3,528,836 | SCHEDULE 13G, 2026-04-30 | 2026-03-31 |
| T. Rowe Price Associates, Inc. | 4.1% | 2,753,871 | SCHEDULE 13G/A, 2026-02-17 | 2025-12-31 |
| Fmr LLC | 3.3% | 2,243,989 | SCHEDULE 13G/A, 2026-05-06 | 2026-03-31 |
| Jpmorgan Chase & Co. | 2.9% | 2,005,756 | SCHEDULE 13G/A, 2026-09-03 | 2026-08-31 |
| Victory Capital Management, Inc. | 0.9% | 604,690 | SCHEDULE 13G/A, 2026-07-24 | 2026-06-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-08 | Victory Capital Management, Inc. | 5.64% | SCHEDULE 13G |
| 2025-08-08 | Victory Capital Management, Inc. | 5.64% | SCHEDULE 13G/A |
| 2025-08-14 | T. Rowe Price Associates, Inc. | 6.2% | SCHEDULE 13G/A |
| 2025-10-17 | BlackRock, Inc. | 8.8% | SCHEDULE 13G/A |
| 2025-10-31 | The Vanguard Group | 11.54% | SCHEDULE 13G/A |
| 2026-02-12 | Invesco Ltd. | 6.5% | SCHEDULE 13G |
| 2026-02-17 | T. Rowe Price Associates, Inc. | 4.1% | SCHEDULE 13G/A |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-29 | Vanguard Portfolio Management | 5.49% | SCHEDULE 13G |
| 2026-04-30 | Vanguard Capital Management | 5.24% | SCHEDULE 13G |
| 2026-05-06 | Fmr LLC | 3.3% | SCHEDULE 13G/A |
| 2026-07-16 | Jpmorgan Chase & Co | 5% | SCHEDULE 13G |
| 2026-07-24 | Victory Capital Management, Inc. | 0.9% | SCHEDULE 13G/A |
| 2026-09-03 | Jpmorgan Chase & Co. | 2.9% | SCHEDULE 13G/A |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.