IDEXX Laboratories, Inc.
US ˙ NasdaqGS ˙ US45168D1046

SecurityIDXX / IDEXX Laboratories, Inc.
InstitutionHm Payson & Co
Latest Disclosed Ownership22,412 shares
Latest Disclosed Value $ 12,593,152
Hm Payson & Co reports 2.83% increase in ownership of IDXX / IDEXX Laboratories, Inc.

On April 13, 2026 - Hm Payson & Co filed a 13F-HR form disclosing ownership of 22,412 shares of IDEXX Laboratories, Inc. (US:IDXX) valued at $12,593,079 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 21,796 shares of IDEXX Laboratories, Inc.. This represents a change in shares of 2.83% during the quarter. The current value of the position is $12,567,081 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-04-13 2026-03-31 13F IDEXX LABS COM 45168D104 22,412 616 2.83 12,593 -14.59 0.0944
2026-02-12 2025-12-31 13F IDEXX LABS COM 45168D104 21,796 -349 -1.58 14,746 4.22 0.2080
2025-10-17 2025-09-30 13F IDEXX LABS COM 45168D104 22,145 545 2.52 14,148 22.12 0.2034
2025-10-17 2025-06-30 13F IDEXX LABS COM 45168D104 21,600 -255 -1.17 11,585 26.23 0.1835
2025-04-29 2025-03-31 13F IDEXX LABS COM 45168D104 21,855 -170 -0.77 9,178 0.79 0.1611
2025-02-07 2024-12-31 13F IDEXX LABS COM 45168D104 22,025 -1,328 -5.69 9,106 -22.82 0.1545
2024-10-28 2024-09-30 13F IDEXX LABS COM 45168D104 23,353 -952 -3.92 11,798 -0.36 0.2023
2024-08-13 2024-06-30 13F IDEXX LABS COM 45168D104 24,305 -900 -3.57 11,841 -12.99 0.2151
2024-06-20 2024-03-31 13F IDEXX LABS COM 45168D104 25,205 -1,309 -4.94 13,609 -7.53 0.2529
2024-02-13 2023-12-31 13F IDEXX LABS COM 45168D104 26,514 10 0.04 14,717 26.98 0.3048
2023-11-06 2023-09-30 13F IDEXX LABS COM 45168D104 26,504 655 2.53 11,589 -10.73 0.2717
2023-07-17 2023-06-30 13F IDEXX LABS COM 45168D104 25,849 -131 -0.50 12,982 -0.08 0.2915
2023-04-18 2023-03-31 13F IDEXX LABS COM 45168D104 25,980 -1,484 -5.40 12,992 15.96 0.3116
2023-02-06 2022-12-31 13F IDEXX LABS COM 45168D104 27,464 -161 -0.58 11,204 24.49 0.2790
2022-10-25 2022-09-30 13F IDEXX LABS COM 45168D104 27,625 -70 -0.25 9,000 -7.34 0.2471
2022-08-15 2022-06-30 13F IDEXX LABS COM 45168D104 27,695 -2,161 -7.24 9,713 -40.53 0.2490
2022-05-12 2022-03-31 13F IDEXX LABS COM 45168D104 29,856 54 0.18 16,333 -16.77 0.3717
2022-02-15 2021-12-31 13F IDEXX LABS COM 45168D104 29,802 350 1.19 19,623 7.14 0.4266
2021-11-30 2021-09-30 13F IDEXX LABS COM 45168D104 29,452 -8 -0.03 18,316 -1.55 0.4459
2021-08-17 2021-06-30 13F IDEXX LABS COM 45168D104 29,460 -8 -0.03 18,605 29.03 0.4535
2021-06-15 2021-03-31 13F IDEXX LABS COM 45168D104 29,468 120 0.41 14,419 -1.71 0.3838
2021-03-10 2020-12-31 13F IDEXX LABS COM 45168D104 29,348 -899 -2.97 14,670 23.38 0.4054
2020-12-21 2020-09-30 13F IDEXX LABS COM 45168D104 30,247 -151 -0.50 11,890 18.47 0.3662
2020-08-13 2020-06-30 13F IDEXX LABS COM 45168D104 30,398 -200 -0.65 10,036 35.40 0.3366
2020-07-01 2020-03-31 13F IDEXX LABS COM 45168D104 30,598 -3,624 -10.59 7,412 -17.05 0.2912
2020-02-18 2019-12-31 13F IDEXX LABS COM 45168D104 34,222 54 0.16 8,936 -3.82 0.2870
2019-11-12 2019-09-30 13F IDEXX LABS COM 45168D104 34,168 3,190 10.30 9,291 8.93 0.3273
2019-08-15 2019-06-30 13F IDEXX LABS COM 45168D104 30,978 -467 -1.49 8,529 21.31 0.3059
2019-07-31 2019-03-31 13F IDEXX LABS COM 45168D104 31,445 31,445 7,031 0.2687
2019-02-15 2018-12-31 13F IDEXX LABORATORIES COMMON STOCK 45168D104 0 -21,519 -100.00 0 -100.00
2018-11-30 2018-09-30 13F IDEXX LABORATORIES COMMON STOCK 45168D104 21,519 -1,930 -8.23 5,372 5.13 0.2405
2018-08-27 2018-06-30 13F IDEXX LABORATORIES COMMON STOCK 45168D104 23,449 -100 -0.42 5,110 13.38 0.2184
2018-05-14 2018-03-31 13F IDEXX LABORATORIES COMMON STOCK 45168D104 23,549 -20 -0.08 4,507 22.27 0.1860
2018-02-16 2017-12-31 13F IDEXX LABORATORIES COMMON STOCK 45168D104 23,569 1,563 7.10 3,686 7.75 0.1482
2017-11-06 2017-09-30 13F IDEXX LABORATORIES COMMON STOCK 45168D104 22,006 1,035 4.94 3,421 1.06 0.1471
2017-08-04 2017-06-30 13F IDEXX LABORATORIES COMMON STOCK 45168D104 20,971 -120 -0.57 3,385 3.83 0.1526
2017-05-25 2017-03-31 13F IDEXX LABORATORIES COMMON STOCK 45168D104 21,091 85 0.40 3,260 32.36 0.1487
2017-02-15 2016-12-31 13F IDEXX LABORATORIES COMMON STOCK 45168D104 21,006 -150 -0.71 2,463 3.27 0.1173
2016-11-14 2016-09-30 13F IDEXX LABORATORIES COMMON STOCK 45168D104 21,156 -2,400 -10.19 2,385 9.05 0.1163
2016-08-08 2016-06-30 13F IDEXX LABORATORIES COMMON STOCK 45168D104 23,556 -220 -0.93 2,187 17.45 0.1092
2016-05-19 2016-03-31 13F IDEXX LABORATORIES COMMON STOCK 45168D104 23,776 -400 -1.65 1,862 5.62 0.0968
2016-02-23 2015-12-31 13F IDEXX LABORATORIES COMMON STOCK 45168D104 24,176 1,632 7.24 1,763 5.32 0.0906
2015-11-02 2015-09-30 13F IDEXX LABORATORIES COMMON STOCK 45168D104 22,544 0 0.00 1,674 15.77 0.0907
2015-08-11 2015-06-30 13F IDEXX LABORATORIES COMMON STOCK 45168D104 22,544 11,222 99.12 1,446 -17.32 0.0720
2015-05-06 2015-03-31 13F IDEXX LABORATORIES COMMON STOCK 45168D104 11,322 250 2.26 1,749 6.52 0.0874
2015-02-10 2014-12-31 13F IDEXX LABORATORIES COMMON STOCK 45168D104 11,072 0 0.00 1,642 25.82 0.0813
2014-11-12 2014-09-30 13F IDEXX LABORATORIES COMMON STOCK 45168D104 11,072 0 0.00 1,305 -11.76 0.0669
2014-08-13 2014-06-30 13F IDEXX LABORATORIES COMMON STOCK 45168D104 11,072 -110 -0.98 1,479 8.99 0.0760
2014-05-07 2014-03-31 13F IDEXX LABORATORIES COMMON STOCK 45168D104 11,182 -150 -1.32 1,357 12.61 0.0718
2014-02-10 2013-12-31 13F IDEXX LABORATORIES COMMON STOCK 45168D104 11,332 -400 -3.41 1,205 3.08 0.0646
2013-11-13 2013-09-30 13F IDEXX LABORATORIES COMMON STOCK 45168D104 11,732 -1,210 -9.35 1,169 0.69 0.0678
2013-08-13 2013-06-30 13F IDEXX LABORATORIES COMMON STOCK 45168D104 12,942 12,942 1,161 0.0697
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.