Fundsmith LLP: IDEXX LABS INC (IDXX): Quarterly 13F Position History
As of Q1 2026, Fundsmith LLP reported 1,465,786 shares of IDEXX LABS INC (IDXX), worth $823.6M and representing 6.4% of its 13F equity book. Quarter-over-quarter share count change: 410,249 (-21.9%) . The position first appeared in Q1 2016 and has been disclosed across 41 13F-HR filings in Pactolio's tracked window.
- 1,465,786Shares Held (Latest Filing)
- $823.6MReported Market Value (Latest Filing)
- 6.4%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 | 6.4% | $561.9 |
| Q4 2025 | 1,876,035 | 734,422 | -28.1% | $1.3B | 7.4% | $676.5 |
| Q3 2025 | 2,610,457 | 28,832 | -1.1% | $1.7B | 8.4% | $638.9 |
| Q2 2025 | 2,639,289 | 9,042 | -0.3% | $1.4B | 6.2% | $536.3 |
| Q1 2025 | 2,648,331 | 14,524 | -0.5% | $1.1B | 5.1% | $419.9 |
| Q4 2024 | 2,662,855 | 1,307 | -0.0% | $1.1B | 4.7% | $413.4 |
| Q3 2024 | 2,664,162 | +970 | +0.0% | $1.3B | 5.3% | $505.2 |
| Q2 2024 | 2,663,192 | 51,570 | -1.9% | $1.3B | 5.3% | $487.2 |
| Q1 2024 | 2,714,762 | 14,155 | -0.5% | $1.5B | 5.7% | $539.9 |
| Q4 2023 | 2,728,917 | 235,637 | -7.9% | $1.5B | 6.3% | $555.0 |
| Q3 2023 | 2,964,554 | +3,003 | +0.1% | $1.3B | 5.9% | $437.3 |
| Q2 2023 | 2,961,551 | +7,355 | +0.2% | $1.5B | 6.2% | $502.2 |
| Q1 2023 | 2,954,196 | 489,536 | -14.2% | $1.5B | 6.4% | $500.1 |
| Q4 2022 | 3,443,732 | 177,045 | -4.9% | $1.4B | 6.4% | $408.0 |
| Q3 2022 | 3,620,777 | +1,902 | +0.1% | $1.2B | 5.6% | $325.8 |
| Q2 2022 | 3,618,875 | +813 | +0.0% | $1.3B | 5.6% | $350.7 |
| Q1 2022 | 3,618,062 | 624,221 | -14.7% | $2.0B | 6.8% | $547.1 |
| Q4 2021 | 4,242,283 | +81 | +0.0% | $2.8B | 6.8% | $658.5 |
| Q3 2021 | 4,242,202 | 260 | -0.0% | $2.6B | 7.3% | $621.9 |
| Q2 2021 | 4,242,462 | +21,850 | +0.5% | $2.7B | 7.4% | $631.5 |
| Q1 2021 | 4,220,612 | 5,816 | -0.1% | $2.1B | 6.6% | $489.3 |
| Q4 2020 | 4,226,428 | 6,387 | -0.2% | $2.1B | 7.0% | $499.9 |
| Q3 2020 | 4,232,815 | 7,896 | -0.2% | $1.7B | 6.5% | $393.1 |
| Q2 2020 | 4,240,711 | 4,516 | -0.1% | $1.4B | 6.1% | $330.2 |
| Q1 2020 | 4,245,227 | 346,672 | -7.5% | $1.0B | 5.8% | $242.2 |
| Q4 2019 | 4,591,899 | +35,883 | +0.8% | $1.2B | 5.7% | $261.1 |
| Q3 2019 | 4,556,016 | +85,978 | +1.9% | $1.2B | 6.3% | $271.9 |
| Q2 2019 | 4,470,038 | +2,697 | +0.1% | $1.2B | 6.4% | $275.3 |
| Q1 2019 | 4,467,341 | +85,293 | +1.9% | $998.9M | 5.7% | $223.6 |
| Q4 2018 | 4,382,048 | 44,595 | -1.0% | $1.1B | 7.0% | $249.7 |
| Q3 2018 | 4,426,643 | 2,461 | -0.1% | $1.1B | 7.4% | $249.7 |
| Q2 2018 | 4,429,104 | +1,447 | +0.0% | $965.3M | 7.2% | $217.9 |
| Q1 2018 | 4,427,657 | +22,901 | +0.5% | $847.4M | 7.0% | $191.4 |
| Q4 2017 | 4,404,756 | 14,088,162 | -76.2% | $688.8M | 5.9% | $156.4 |
| Q3 2017 | 18,492,918 | +14,046,878 | +315.9% | $1.6B | 15.3% | $85.7 |
| Q2 2017 | 4,446,040 | 34,167 | -0.8% | $717.7M | 7.5% | $161.4 |
| Q1 2017 | 4,480,207 | +3,341 | +0.1% | $692.7M | 8.0% | $154.6 |
| Q4 2016 | 4,476,866 | 14,017 | -0.3% | $528.6M | 7.0% | $118.1 |
| Q3 2016 | 4,490,883 | +21,547 | +0.5% | $506.3M | 6.9% | $112.7 |
| Q2 2016 | 4,469,336 | +258,657 | +6.1% | $415.0M | 6.8% | $92.9 |
| Q1 2016 | 4,210,679 | — | — | $329.8M | 7.1% | $78.3 |
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.