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Idexx Laboratories
IDXX

1,302 hedge funds and large institutions have $46.1B invested in Idexx Laboratories in 2025 Q3 according to their latest regulatory filings, with 162 funds opening new positions, 416 increasing their positions, 491 reducing their positions, and 75 closing their positions.

New
Increased
Maintained
Reduced
Closed

116% more first-time investments, than exits

New positions opened: 162 | Existing positions closed: 75

23% more funds holding in top 10

Funds holding in top 10: 22 → 27 (+5)

21% more call options, than puts

Call options by funds: $175M | Put options by funds: $144M

15% more capital invested

Capital invested by funds: $40B → $46.1B (+$6.14B)

6% more funds holding

Funds holding: 1,234 → 1,302 (+68)

2.42% less ownership

Funds ownership: 92.67% → 90.25% (-2.4%)

15% less repeat investments, than reductions

Existing positions increased: 416 | Existing positions reduced: 491

Holders
1,302
Holders Change
+68
Holders Change %
+5.51%
% of All Funds
17.09%
Holding in Top 10
27
Holding in Top 10 Change
+5
Holding in Top 10 Change %
+22.73%
% of All Funds
0.35%
New
162
Increased
416
Reduced
491
Closed
75
Calls
$175M
Puts
$144M
Net Calls
+$30.9M
Net Calls Change
+$51.9M

Top Buyers

1
Bank of New York Mellon
Bank of New York Mellon
New York
+$367M
2
JP Morgan Chase
JP Morgan Chase
New York
+$198M
3
ZIG
Zurich Insurance Group
Switzerland
+$137M
4
Principal Financial Group
Principal Financial Group
Iowa
+$114M
5
Invesco
Invesco
Georgia
+$98.2M

Top Sellers

1
GIM
Generation Investment Management
United Kingdom
-$186M
2
Select Equity Group
Select Equity Group
New York
-$177M
3
Vontobel Holding
Vontobel Holding
Switzerland
-$162M
4
William Blair Investment Management
William Blair Investment Management
Illinois
-$137M
5
MBI
Montrusco Bolton Investments
Quebec, Canada
-$120M
Name Holding Trade Value Shares
Change 		Change in
Stake
LFA
1376
LGT Financial Advisors
Texas
– -$536 -1 Closed
SN
1377
Sittner & Nelson
Oregon
– -$536 -1 Closed
52 53 54 55
56

IDXX Hedge Fund Activity: Q3 2025 in Review

1,302 of the 7,619 institutional investors tracked by Wall St. Rank reported a position in Idexx Laboratories (IDXX) for Q3 2025, worth a combined $46.1B — up 15% from $40B a quarter earlier.

Buyers outnumbered sellers: 162 funds opened new IDXX positions and 75 closed out — a net gain of 87 holders — while 416 added to existing stakes and 491 trimmed.

The largest buyer was Bank of New York Mellon, adding an estimated $367M. The largest seller was Generation Investment Management, cutting an estimated $186M.

  • 1,302 institutional investors held Idexx Laboratories (IDXX) as of Q3 2025, up from 1,234 in Q2 2025.
  • Funds reported $46.1B of Idexx Laboratories stock for Q3 2025, up 15% quarter-over-quarter.
  • 162 funds opened new Idexx Laboratories positions in Q3 2025 and 75 closed out, a net change of +87 holders.
  • The largest Idexx Laboratories buyer in Q3 2025 was Bank of New York Mellon, an estimated $367M added.
  • The largest Idexx Laboratories seller in Q3 2025 was Generation Investment Management, an estimated $186M sold.

Based on aggregated 13F filings for Q3 2025.