Fundsmith LLP — IDEXX LABS INC IDXX: Quarterly 13F Position History
Fundsmith LLP has reported IDEXX LABS INC (IDXX) on 41 13F-HR filings in Pactolio's tracked window, first appearing in Q1 2016. As of Q1 2026, the position is sized at 1,465,786 shares ($823.6M market value, 6.42% of the equity book). Quarter-over-quarter share count change: 410,249 (-21.9%) .
- 1,465,786Shares Held (Latest Filing)
- $823.6MReported Market Value (Latest Filing)
- 6.42%Portfolio Weight (% of 13F Equity Book)
- 410,249Quarter-over-Quarter Share Change
- -$445.6MQuarter-over-Quarter Value Change
- 18,492,918Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 41 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 1,465,786 | 410,249 | -21.9% | $823.6M | 6.42% | $561.89 |
| Q4 2025 | 1,876,035 | 734,422 | -28.1% | $1.27B | 7.42% | $676.53 |
| Q3 2025 | 2,610,457 | 28,832 | -1.1% | $1.67B | 8.43% | $638.89 |
| Q2 2025 | 2,639,289 | 9,042 | -0.3% | $1.42B | 6.15% | $536.34 |
| Q1 2025 | 2,648,331 | 14,524 | -0.5% | $1.11B | 5.06% | $419.95 |
| Q4 2024 | 2,662,855 | 1,307 | -0.0% | $1.10B | 4.69% | $413.44 |
| Q3 2024 | 2,664,162 | +970 | +0.0% | $1.35B | 5.32% | $505.22 |
| Q2 2024 | 2,663,192 | 51,570 | -1.9% | $1.30B | 5.29% | $487.20 |
| Q1 2024 | 2,714,762 | 14,155 | -0.5% | $1.47B | 5.74% | $539.93 |
| Q4 2023 | 2,728,917 | 235,637 | -7.9% | $1.51B | 6.34% | $555.05 |
| Q3 2023 | 2,964,554 | +3,003 | +0.1% | $1.30B | 5.89% | $437.27 |
| Q2 2023 | 2,961,551 | +7,355 | +0.2% | $1.49B | 6.24% | $502.23 |
| Q1 2023 | 2,954,196 | 489,536 | -14.2% | $1.48B | 6.37% | $500.08 |
| Q4 2022 | 3,443,732 | 177,045 | -4.9% | $1.40B | 6.42% | $407.96 |
| Q3 2022 | 3,620,777 | +1,902 | +0.1% | $1.18B | 5.60% | $325.80 |
| Q2 2022 | 3,618,875 | +813 | +0.0% | $1.27B | 5.60% | $350.73 |
| Q1 2022 | 3,618,062 | 624,221 | -14.7% | $1.98B | 6.80% | $547.06 |
| Q4 2021 | 4,242,283 | +81 | +0.0% | $2.79B | 6.82% | $658.46 |
| Q3 2021 | 4,242,202 | 260 | -0.0% | $2.64B | 7.29% | $621.90 |
| Q2 2021 | 4,242,462 | +21,850 | +0.5% | $2.68B | 7.42% | $631.55 |
| Q1 2021 | 4,220,612 | 5,816 | -0.1% | $2.07B | 6.57% | $489.31 |
| Q4 2020 | 4,226,428 | 6,387 | -0.2% | $2.11B | 7.00% | $499.87 |
| Q3 2020 | 4,232,815 | 7,896 | -0.2% | $1.66B | 6.50% | $393.11 |
| Q2 2020 | 4,240,711 | 4,516 | -0.1% | $1.40B | 6.11% | $330.16 |
| Q1 2020 | 4,245,227 | 346,672 | -7.5% | $1.03B | 5.79% | $242.24 |
| Q4 2019 | 4,591,899 | +35,883 | +0.8% | $1.20B | 5.67% | $261.13 |
| Q3 2019 | 4,556,016 | +85,978 | +1.9% | $1.24B | 6.33% | $271.93 |
| Q2 2019 | 4,470,038 | +2,697 | +0.1% | $1.23B | 6.41% | $275.33 |
| Q1 2019 | 4,467,341 | +85,293 | +1.9% | $998.9M | 5.68% | $223.60 |
| Q4 2018 | 4,382,048 | 44,595 | -1.0% | $1.09B | 7.01% | $249.66 |
| Q3 2018 | 4,426,643 | 2,461 | -0.1% | $1.11B | 7.41% | $249.66 |
| Q2 2018 | 4,429,104 | +1,447 | +0.0% | $965.3M | 7.18% | $217.94 |
| Q1 2018 | 4,427,657 | +22,901 | +0.5% | $847.4M | 6.99% | $191.39 |
| Q4 2017 | 4,404,756 | 14,088,162 | -76.2% | $688.8M | 5.90% | $156.38 |
| Q3 2017 | 18,492,918 | +14,046,878 | +315.9% | $1.58B | 15.34% | $85.66 |
| Q2 2017 | 4,446,040 | 34,167 | -0.8% | $717.7M | 7.53% | $161.42 |
| Q1 2017 | 4,480,207 | +3,341 | +0.1% | $692.7M | 8.05% | $154.61 |
| Q4 2016 | 4,476,866 | 14,017 | -0.3% | $528.6M | 6.96% | $118.08 |
| Q3 2016 | 4,490,883 | +21,547 | +0.5% | $506.3M | 6.92% | $112.73 |
| Q2 2016 | 4,469,336 | +258,657 | +6.1% | $415.0M | 6.82% | $92.86 |
| Q1 2016 | 4,210,679 | — | — | $329.8M | 7.10% | $78.32 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did Fundsmith LLP first disclose a IDXX position in 13F-HR filings?
Fundsmith LLP first reported IDEXX LABS INC (IDXX) on its 13F-HR filing for the period ending 2016-03-31 (Q1 2016). The position has appeared on 41 reported quarters within Pactolio's tracked window.
What was Fundsmith LLP's most recent quarter-over-quarter share-count change in IDXX?
Between Q4 2025 and Q1 2026, Fundsmith LLP reduced its IDXX position by 410,249 shares (-21.9%), leaving 1,465,786 shares at a market value of $823.6M.
Does the implied price-per-share represent Fundsmith LLP's cost basis in IDXX?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.