Thermo Fisher Scientific
TMO
2,612 hedge funds and large institutions have $164B invested in Thermo Fisher Scientific in 2026 Q1 according to their latest regulatory filings, with 174 funds opening new positions, 982 increasing their positions, 1,098 reducing their positions, and 232 closing their positions.
1.98% less ownership
Funds ownership: 91.44% → 89.47% (-2%)
4% less funds holding
Funds holding: 2,707 → 2,612 (-95)
11% less repeat investments, than reductions
Existing positions increased: 982 | Existing positions reduced: 1,098
18% less capital invested
Capital invested by funds: $199B → $164B (-$35B)
25% less first-time investments, than exits
New positions opened: 174 | Existing positions closed: 232
28% less call options, than puts
Call options by funds: $903M | Put options by funds: $1.26B
32% less funds holding in top 10
Funds holding in top 10: 114 → 77 (-37)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Capital International Investors
Los Angeles,
California
|
+$1.61B |
| 2 |
Capital Research Global Investors
Los Angeles,
California
|
+$814M |
| 3 |
Fidelity Investments
Boston,
Massachusetts
|
+$534M |
| 4 |
Viking Global Investors
Stamford,
Connecticut
|
+$475M |
| 5 |
1832 Asset Management
Toronto,
Ontario, Canada
|
+$394M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Capital World Investors
Los Angeles,
California
|
-$2.36B |
| 2 |
Wellington Management Group
Boston,
Massachusetts
|
-$1.08B |
| 3 |
T. Rowe Price Associates
Baltimore,
Maryland
|
-$752M |
| 4 |
T. Rowe Price Investment Management
Baltimore,
Maryland
|
-$647M |
| 5 |
Morgan Stanley
New York
|
-$559M |
TMO Hedge Fund Activity: Q1 2026 in Review
2,612 of the 8,207 institutional investors tracked by Wall St. Rank reported a position in Thermo Fisher Scientific (TMO) for Q1 2026, worth a combined $164B — down 18% from $199B a quarter earlier.
Sellers outnumbered buyers: 232 funds closed out of TMO and 174 opened new positions — a net loss of 58 holders — while 1,098 trimmed existing stakes and 982 added.
The largest buyer was Capital International Investors, adding an estimated $1.61B. The largest seller was Capital World Investors, cutting an estimated $2.36B.
- 2,612 institutional investors held Thermo Fisher Scientific (TMO) as of Q1 2026, down from 2,707 in Q4 2025.
- Funds reported $164B of Thermo Fisher Scientific stock for Q1 2026, down 18% quarter-over-quarter.
- 174 funds opened new Thermo Fisher Scientific positions in Q1 2026 and 232 closed out, a net change of -58 holders.
- The largest Thermo Fisher Scientific buyer in Q1 2026 was Capital International Investors, an estimated $1.61B added.
- The largest Thermo Fisher Scientific seller in Q1 2026 was Capital World Investors, an estimated $2.36B sold.
Based on aggregated 13F filings for Q1 2026.