Idexx Laboratories
IDXX
1,386 hedge funds and large institutions have $50.3B invested in Idexx Laboratories in 2025 Q4 according to their latest regulatory filings, with 190 funds opening new positions, 481 increasing their positions, 483 reducing their positions, and 80 closing their positions.
138% more first-time investments, than exits
New positions opened: 190 | Existing positions closed: 80
18% more call options, than puts
Call options by funds: $116M | Put options by funds: $97.8M
9% more capital invested
Capital invested by funds: $46.1B → $50.3B (+$4.2B)
6% more funds holding
Funds holding: 1,303 → 1,386 (+83)
2.9% more ownership
Funds ownership: 90.25% → 93.15% (+2.9%)
0% less repeat investments, than reductions
Existing positions increased: 481 | Existing positions reduced: 483
7% less funds holding in top 10
Funds holding in top 10: 27 → 25 (-2)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Invesco
Atlanta,
Georgia
|
+$1.35B |
| 2 |
Wellington Management Group
Boston,
Massachusetts
|
+$404M |
| 3 |
Arrowstreet Capital
Boston,
Massachusetts
|
+$249M |
| 4 |
BlackRock
New York
|
+$225M |
| 5 |
T. Rowe Price Associates
Baltimore,
Maryland
|
+$176M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fundsmith LLP
London,
United Kingdom
|
-$500M |
| 2 |
Macquarie Group
Sydney, NSW 2000,
Australia
|
-$347M |
| 3 |
Bank of New York Mellon
New York
|
-$294M |
| 4 |
Principal Financial Group
Des Moines,
Iowa
|
-$236M |
| 5 |
GIM
Generation Investment Management
London,
United Kingdom
|
-$166M |
IDXX Hedge Fund Activity: Q4 2025 in Review
1,386 of the 8,266 institutional investors tracked by Wall St. Rank reported a position in Idexx Laboratories (IDXX) for Q4 2025, worth a combined $50.3B — up 9.1% from $46.1B a quarter earlier.
Buyers outnumbered sellers: 190 funds opened new IDXX positions and 80 closed out — a net gain of 110 holders — while 481 added to existing stakes and 483 trimmed.
The largest buyer was Invesco, adding an estimated $1.35B. The largest seller was Fundsmith LLP, cutting an estimated $500M.
- 1,386 institutional investors held Idexx Laboratories (IDXX) as of Q4 2025, up from 1,303 in Q3 2025.
- Funds reported $50.3B of Idexx Laboratories stock for Q4 2025, up 9.1% quarter-over-quarter.
- 190 funds opened new Idexx Laboratories positions in Q4 2025 and 80 closed out, a net change of +110 holders.
- The largest Idexx Laboratories buyer in Q4 2025 was Invesco, an estimated $1.35B added.
- The largest Idexx Laboratories seller in Q4 2025 was Fundsmith LLP, an estimated $500M sold.
Based on aggregated 13F filings for Q4 2025.