William Blair Investment Management, LLC / IDXX
William Blair Investment Management, LLC’s Idexx Labs Inc Position
Does William Blair Investment Management, LLC own Idexx Labs Inc (IDXX)? Yes — 351.6K shares worth $198M (+0.65% of its 13F portfolio) as of Q1 2026, down from 441.3K shares the prior filed quarter.
Position Value
$198M
Q1 2026
Shares
351.6K
% of Portfolio
+0.65%
Quarters Held
30
currently held
Position History IDXX
Reported value by quarter
| Quarter | Shares | Value | % of Portfolio |
|---|---|---|---|
| Q1 2026 | 351.6K | $198M | +0.65% |
| Q4 2025 | 441.3K | $299M | +0.83% |
| Q3 2025 | 459.0K | $293M | +0.76% |
| Q2 2025 | 685.1K | $367M | +0.98% |
| Q1 2025 | 637.1K | $268M | +0.75% |
| Q4 2024 | 422.1K | $175M | +0.43% |
| Q3 2024 | 52.7K | $27M | +0.07% |
| Q2 2024 | 67.1K | $33M | +0.09% |
| Q1 2024 | 69.0K | $37M | +0.10% |
| Q4 2023 | 68.3K | $38M | +0.11% |
| Q3 2023 | 67.1K | $29M | +0.10% |
| Q2 2023 | 75.0K | $38M | +0.12% |
| Q1 2023 | 75.3K | $38M | +0.13% |
| Q4 2022 | 77.7K | $32M | +0.12% |
| Q3 2022 | 107.6K | $35M | +0.14% |
| Q2 2022 | 110.6K | $39M | +0.14% |
| Q1 2022 | 116.4K | $64M | +0.19% |
| Q4 2021 | 124.0K | $82M | +0.22% |
| Q3 2021 | 121.8K | $76M | +0.21% |
| Q2 2021 | 123.2K | $78M | +0.24% |
| Q1 2021 | 95.2K | $47M | +0.15% |
| Q4 2020 | 109.4K | $55M | +0.18% |
| Q3 2020 | 129.0K | $51M | +0.20% |
| Q2 2020 | 144.2K | $48M | +0.19% |
| Q1 2020 | 166.9K | $40M | +0.20% |
| Q4 2019 | 115.1K | $30M | +0.12% |
| Q3 2019 | 157.9K | $43M | +0.18% |
| Q2 2019 | 183.4K | $50M | +0.21% |
| Q1 2019 | 122.3K | $27M | +0.12% |
| Q4 2018 | 52.7K | $10M | +0.05% |
Common-stock position only; options are excluded. Quarters where the fund filed no 13F or reported no position are absent. See William Blair Investment Management, LLC’s full portfolio or all institutional holders of IDXX.