Thermo Fisher Scientific
TMO
2,508 hedge funds and large institutions have $161B invested in Thermo Fisher Scientific in 2025 Q3 according to their latest regulatory filings, with 240 funds opening new positions, 981 increasing their positions, 953 reducing their positions, and 147 closing their positions.
68% more funds holding in top 10
Funds holding in top 10: 44 → 74 (+30)
63% more first-time investments, than exits
New positions opened: 240 | Existing positions closed: 147
29% more call options, than puts
Call options by funds: $2.35B | Put options by funds: $1.82B
19% more capital invested
Capital invested by funds: $135B → $161B (+$25.3B)
2% more funds holding
Funds holding: 2,453 → 2,508 (+55)
3% more repeat investments, than reductions
Existing positions increased: 981 | Existing positions reduced: 953
1.2% less ownership
Funds ownership: 89.04% → 87.83% (-1.2%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
+$1.68B |
| 2 |
BlackRock
New York
|
+$1.07B |
| 3 |
DZ Bank
Frankfurt Am Main,
Germany
|
+$917M |
| 4 |
Bank of America
Charlotte,
North Carolina
|
+$673M |
| 5 |
Wellington Management Group
Boston,
Massachusetts
|
+$591M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Capital Research Global Investors
Los Angeles,
California
|
-$1.06B |
| 2 |
Polen Capital Management
Boca Raton,
Florida
|
-$966M |
| 3 |
JP Morgan Chase
New York
|
-$875M |
| 4 |
Qube Research & Technologies (QRT)
London,
United Kingdom
|
-$735M |
| 5 |
D.E. Shaw & Co
New York
|
-$587M |
TMO Hedge Fund Activity: Q3 2025 in Review
2,508 of the 7,620 institutional investors tracked by Wall St. Rank reported a position in Thermo Fisher Scientific (TMO) for Q3 2025, worth a combined $161B — up 19% from $135B a quarter earlier.
Buyers outnumbered sellers: 240 funds opened new TMO positions and 147 closed out — a net gain of 93 holders — while 981 added to existing stakes and 953 trimmed.
The largest buyer was Fidelity Investments, adding an estimated $1.68B. The largest seller was Capital Research Global Investors, cutting an estimated $1.06B.
- 2,508 institutional investors held Thermo Fisher Scientific (TMO) as of Q3 2025, up from 2,453 in Q2 2025.
- Funds reported $161B of Thermo Fisher Scientific stock for Q3 2025, up 19% quarter-over-quarter.
- 240 funds opened new Thermo Fisher Scientific positions in Q3 2025 and 147 closed out, a net change of +93 holders.
- The largest Thermo Fisher Scientific buyer in Q3 2025 was Fidelity Investments, an estimated $1.68B added.
- The largest Thermo Fisher Scientific seller in Q3 2025 was Capital Research Global Investors, an estimated $1.06B sold.
Based on aggregated 13F filings for Q3 2025.