MKS Inc. (MKSI) Shareholders & Insider Trades
MKS shareholders at a glance
The largest holder of MKS stock is BlackRock Advisors LLC, with 6.5 million shares (9.63% of the company), worth about $1.67 billion as of September 25, 2026. The 10 largest holders together own 45.9%.
In Q2 2026, 814 institutional holdings reports listed shares worth $31.40 billion.
Insiders reported 69 transactions in the last two years: 32 sales worth $23.68 million and no purchases. The newest one on file is from May 14, 2026 (Moloney Jacqueline F, Director).
Major holders as of September 25, 2026; quarterly totals from institutional holdings reports (latest Q2 2026); insider transactions on file through May 14, 2026.
MKS Inc.
Shareholders Summary
2026Q2
Ownership by Type
Geographic Distribution
Largest MKS shareholders
| Holder | Shares | % of company | Value |
|---|---|---|---|
| BlackRock Advisors LLC | 6.5 million | 9.63% | $1.7B |
| Invesco Advisers, Inc. | 4.7 million | 6.89% | $1.2B |
| Vanguard Portfolio Management LLC | 3.7 million | 5.48% | $950.0M |
| JPMorgan Investment Management, Inc. | 3.4 million | 4.99% | $865.0M |
| Vanguard Capital Management LLC | 3.0 million | 4.51% | $781.0M |
| State Street Corporation | 2.1 million | 3.16% | $547.0M |
| Point72 Asset Management LP | 2.0 million | 2.95% | $512.0M |
| Capital Research & Management Co. (International Investors) | 1.9 million | 2.83% | $491.0M |
| T. Rowe Price International Ltd. | 1.9 million | 2.79% | $484.0M |
| Aspex Management (HK) Ltd. | 1.8 million | 2.69% | $466.0M |
As of September 25, 2026.
MKS institutional holdings by quarter
| Quarter | Reports | Shares | Value |
|---|---|---|---|
| Q2 2026 | 814 | – | $31.4B |
| Q1 2026 | 648 | 69.0 million | $15.8B |
| Q4 2025 | 544 | 70.7 million | $11.3B |
| Q3 2025 | 465 | – | $9.0B |
| Q2 2025 | 423 | 75.5 million | $7.5B |
| Q1 2025 | 425 | 71.6 million | $5.7B |
| Q4 2024 | 439 | 70.5 million | $7.4B |
| Q3 2024 | 438 | 68.8 million | $7.5B |
Shares and value held by institutions that file quarterly holdings reports (options not included).
MKS insider trades
| Insider | Date | Title | Transaction | Value |
|---|---|---|---|---|
| Moloney Jacqueline F | May 14, 2026 | Director | Sale at price 312.20 per share. | $312,197 |
| Moloney Jacqueline F | May 13, 2026 | Director | Sale at price 318.99 per share. | $446,586 |
| Burke Kathleen Flaherty | May 11, 2026 | General Counsel | Sale at price 319.94 per share. | $1.4M |
| Taranto Eric Robert | May 11, 2026 | Officer | Sale at price 319.93 per share. | $911,328 |
| Mora Elizabeth A | May 11, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Cannone Peter J Iii | May 11, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Colella Gerard G | May 11, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Donahue Joseph B | May 11, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Moloney Jacqueline F | May 11, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Batra Rajeev | May 11, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Jabre Wissam Georges | May 11, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Williams John Edward | Apr 17, 2026 | Officer | -- | – |
Newest 12 of 69 insider transactions in the last two years.
Questions and answers
Who owns the most MKS stock?
BlackRock Advisors LLC, with 9.63% of the company (as of September 25, 2026). Next: Invesco Advisers, Inc. (6.89%) and Vanguard Portfolio Management LLC (5.48%).
How many institutions own MKS stock?
814 institutional holdings reports listed MKS shares in Q2 2026 worth $31.40 billion.
Are MKS insiders buying or selling the stock?
In the last two years insiders reported 32 sales and no purchases (69 transactions in all); the newest on file is from May 14, 2026.
