Thermo Fisher Scientific Inc. (TMO) Shareholders & Insider Trades
Thermo Fisher Scientific shareholders at a glance
The largest holder of Thermo Fisher Scientific stock is Vanguard Capital Management LLC, with 28.0 million shares (7.54% of the company), worth about $13.42 billion as of May 18, 2026. The 10 largest holders together own 37.9%.
In Q2 2026, 2,731 institutional holdings reports listed shares worth $170.00 billion.
Insiders reported 112 transactions in the last two years: 40 sales worth $206.02 million and no purchases. The newest one on file is from August 31, 2026 (Pettiti Gianluca, President).
Major holders as of May 18, 2026; quarterly totals from institutional holdings reports (latest Q2 2026); insider transactions on file through August 31, 2026.
Thermo Fisher Scientific Inc.
Shareholders Summary
2026Q2
Ownership by Type
Geographic Distribution
Largest Thermo Fisher Scientific shareholders
| Holder | Shares | % of company | Value |
|---|---|---|---|
| Vanguard Capital Management LLC | 28.0 million | 7.54% | $13.4B |
| Vanguard Capital Management LLC | 24.3 million | 6.53% | $11.6B |
| BlackRock Advisors LLC | 21.0 million | 5.64% | $10.0B |
| State Street Corporation | 16.7 million | 4.50% | $8.0B |
| Eaton Vance Management | 10.9 million | 2.92% | $5.2B |
| Fidelity Management & Research Co. LLC | 10.8 million | 2.90% | $5.2B |
| Geode Capital Management LLC | 8.4 million | 2.26% | $4.0B |
| BlackRock Life Ltd. | 7.1 million | 1.90% | $3.4B |
| Fiduciary Trust Company International | 6.8 million | 1.83% | $3.3B |
| JPMorgan Investment Management, Inc. | 6.8 million | 1.83% | $3.3B |
As of May 18, 2026.
Thermo Fisher Scientific institutional holdings by quarter
| Quarter | Reports | Shares | Value |
|---|---|---|---|
| Q2 2026 | 2,731 | – | $170.0B |
| Q1 2026 | 2,712 | 333.0 million | $165.0B |
| Q4 2025 | 2,802 | 378.0 million | $201.0B |
| Q3 2025 | 2,644 | 340.0 million | $165.0B |
| Q2 2025 | 2,583 | 342.0 million | $138.0B |
| Q1 2025 | 2,690 | 340.0 million | $169.0B |
| Q4 2024 | 2,742 | 342.0 million | $178.0B |
| Q3 2024 | 2,697 | 347.0 million | $213.0B |
Shares and value held by institutions that file quarterly holdings reports (options not included).
Thermo Fisher Scientific insider trades
| Insider | Date | Title | Transaction | Value |
|---|---|---|---|---|
| Pettiti Gianluca | Aug 31, 2026 | President | Conversion of Exercise of derivative security at price 309.63 per share. | $1.2M |
| Pettiti Gianluca | Aug 31, 2026 | President | Sale at price 614.38 per share. | $2.5M |
| Casper Marc N | Aug 24, 2026 | Chief Executive Officer | Conversion of Exercise of derivative security at price 309.63 per share. | $85,148 |
| Casper Marc N | Aug 24, 2026 | Chief Executive Officer | Sale at price 625.41 - 628.74 per share. | $172,439 |
| Casper Marc N | Aug 21, 2026 | Chief Executive Officer | Conversion of Exercise of derivative security at price 309.63 per share. | $6.2M |
| Casper Marc N | Aug 21, 2026 | Chief Executive Officer | Sale at price 625.45 - 633.99 per share. | $12.6M |
| Britt Lisa P | Aug 19, 2026 | Officer | Conversion of Exercise of derivative security at price 418.32 per share. | $4.8M |
| Britt Lisa P | Aug 19, 2026 | Officer | Sale at price 613.12 per share. | $7.0M |
| Shafer Michael D | Aug 11, 2026 | Officer | Conversion of Exercise of derivative security at price 309.63 - 418.32 per share. | $9.4M |
| Shafer Michael D | Aug 11, 2026 | Officer | Sale at price 600.00 per share. | $15.3M |
| Holmes Joseph R. | Aug 7, 2026 | Officer | Conversion of Exercise of derivative security at price 309.63 per share. | $130,045 |
| Casper Marc N | Aug 7, 2026 | Chief Executive Officer | Conversion of Exercise of derivative security at price 309.63 per share. | $85,148 |
Newest 12 of 112 insider transactions in the last two years.
Questions and answers
Who owns the most Thermo Fisher Scientific stock?
Vanguard Capital Management LLC, with 7.54% of the company (as of May 18, 2026). Next: Vanguard Capital Management LLC (6.53%) and BlackRock Advisors LLC (5.64%).
How many institutions own Thermo Fisher Scientific stock?
2,731 institutional holdings reports listed Thermo Fisher Scientific shares in Q2 2026 worth $170.00 billion.
Are Thermo Fisher Scientific insiders buying or selling the stock?
In the last two years insiders reported 40 sales and no purchases (112 transactions in all); the newest on file is from August 31, 2026.
