Thermo Fisher Scientific
TMO
2,600 hedge funds and large institutions have $164B invested in Thermo Fisher Scientific in 2026 Q1 according to their latest regulatory filings, with 171 funds opening new positions, 976 increasing their positions, 1,097 reducing their positions, and 231 closing their positions.
4% less funds holding
Funds holding: 2,701 → 2,600 (-101)
10.56% less ownership
Funds ownership: 99.98% → 89.42% (-11%)
11% less repeat investments, than reductions
Existing positions increased: 976 | Existing positions reduced: 1,097
26% less first-time investments, than exits
New positions opened: 171 | Existing positions closed: 231
28% less call options, than puts
Call options by funds: $903M | Put options by funds: $1.26B
29% less capital invested
Capital invested by funds: $231B → $164B (-$66.8B)
33% less funds holding in top 10
Funds holding in top 10: 113 → 76 (-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 |
JSC
J. Stern & Co
London,
United Kingdom
|
-$17.1B |
| 2 |
Capital World Investors
Los Angeles,
California
|
-$2.36B |
| 3 |
Wellington Management Group
Boston,
Massachusetts
|
-$1.08B |
| 4 |
T. Rowe Price Associates
Baltimore,
Maryland
|
-$752M |
| 5 |
T. Rowe Price Investment Management
Baltimore,
Maryland
|
-$647M |
TMO Hedge Fund Activity: Q1 2026 in Review
2,600 of the 8,172 institutional investors tracked by Wall St. Rank reported a position in Thermo Fisher Scientific (TMO) for Q1 2026, worth a combined $164B — down 29% from $231B a quarter earlier.
Sellers outnumbered buyers: 231 funds closed out of TMO and 171 opened new positions — a net loss of 60 holders — while 1,097 trimmed existing stakes and 976 added.
The largest buyer was Capital International Investors, adding an estimated $1.61B. The largest seller was J. Stern & Co, cutting an estimated $17.1B.
- 2,600 institutional investors held Thermo Fisher Scientific (TMO) as of Q1 2026, down from 2,701 in Q4 2025.
- Funds reported $164B of Thermo Fisher Scientific stock for Q1 2026, down 29% quarter-over-quarter.
- 171 funds opened new Thermo Fisher Scientific positions in Q1 2026 and 231 closed out, a net change of -60 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 J. Stern & Co, an estimated $17.1B sold.
Based on aggregated 13F filings for Q1 2026.