Thermo Fisher Scientific
TMO
2,707 hedge funds and large institutions have $199B invested in Thermo Fisher Scientific in 2025 Q4 according to their latest regulatory filings, with 372 funds opening new positions, 946 increasing their positions, 1,039 reducing their positions, and 121 closing their positions.
207% more first-time investments, than exits
New positions opened: 372 | Existing positions closed: 121
52% more funds holding in top 10
Funds holding in top 10: 75 → 114 (+39)
24% more capital invested
Capital invested by funds: $161B → $199B (+$38.3B)
8% more funds holding
Funds holding: 2,515 → 2,707 (+192)
3.56% more ownership
Funds ownership: 87.88% → 91.44% (+3.6%)
9% less repeat investments, than reductions
Existing positions increased: 946 | Existing positions reduced: 1,039
37% less call options, than puts
Call options by funds: $1.36B | Put options by funds: $2.18B
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
+$1.24B |
| 2 |
Royal Bank of Canada
Toronto,
Ontario, Canada
|
+$743M |
| 3 |
T. Rowe Price Investment Management
Baltimore,
Maryland
|
+$719M |
| 4 |
T. Rowe Price Associates
Baltimore,
Maryland
|
+$696M |
| 5 |
BlackRock
New York
|
+$588M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Morgan Stanley
New York
|
-$468M |
| 2 |
Kovitz Investment Group Partners
Chicago,
Illinois
|
-$399M |
| 3 |
JP Morgan Chase
New York
|
-$374M |
| 4 |
FCM
Farallon Capital Management
San Francisco,
California
|
-$352M |
| 5 |
Assenagon Asset Management
Senningerberg,
Luxembourg
|
-$342M |
TMO Hedge Fund Activity: Q4 2025 in Review
2,707 of the 8,284 institutional investors tracked by Wall St. Rank reported a position in Thermo Fisher Scientific (TMO) for Q4 2025, worth a combined $199B — up 24% from $161B a quarter earlier.
Buyers outnumbered sellers: 372 funds opened new TMO positions and 121 closed out — a net gain of 251 holders — while 946 added to existing stakes and 1,039 trimmed.
The largest buyer was Fidelity Investments, adding an estimated $1.24B. The largest seller was Morgan Stanley, cutting an estimated $468M.
- 2,707 institutional investors held Thermo Fisher Scientific (TMO) as of Q4 2025, up from 2,515 in Q3 2025.
- Funds reported $199B of Thermo Fisher Scientific stock for Q4 2025, up 24% quarter-over-quarter.
- 372 funds opened new Thermo Fisher Scientific positions in Q4 2025 and 121 closed out, a net change of +251 holders.
- The largest Thermo Fisher Scientific buyer in Q4 2025 was Fidelity Investments, an estimated $1.24B added.
- The largest Thermo Fisher Scientific seller in Q4 2025 was Morgan Stanley, an estimated $468M sold.
Based on aggregated 13F filings for Q4 2025.