IDEXX Laboratories, Inc.
DE ˙ XTRA ˙ US45168D1046
470,40 € ↓ -12,40 (-2,57%)
2026-06-03
DEL PRIS
SecurityDE:IX1 / IDEXX Laboratories, Inc.
InstitutionSelect Equity Group, L.P.
Latest Disclosed Ownership17,126 shares
Latest Disclosed Value $ 9,622,928
Select Equity Group, L.P. reports 86.97% decrease in ownership of IX1 / IDEXX Laboratories, Inc.

On May 15, 2026 - Select Equity Group, L.P. filed a 13F-HR form disclosing ownership of 17,126 shares of IDEXX Laboratories, Inc. (DE:IX1) valued at $8,357,488 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 131,386 shares of IDEXX Laboratories, Inc.. This represents a change in shares of -86.97% during the quarter. The current value of the position is $8,056,070 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)
2026-05-15 2026-03-31 13F IDEXX LABS COM 45168D104 17,126 -114,260 -86.97 9,623 -89.17 0.0493
2026-02-17 2025-12-31 13F IDEXX LABS COM 45168D104 131,386 -150,632 -53.41 88,887 -50.67 0.3832
2025-11-14 2025-09-30 13F IDEXX LABS COM 45168D104 282,018 -291,695 -50.84 180,178 -41.44 0.7423
2025-08-14 2025-06-30 13F IDEXX LABS COM 45168D104 573,713 109,767 23.66 307,705 57.93 1.2895
2025-05-15 2025-03-31 13F IDEXX LABS COM 45168D104 463,946 463,946 194,834 0.8407
2024-08-14 2024-06-30 13F IDEXX LABS COM 45168D104 0 -117,543 -100.00 0 -100.00
2024-05-15 2024-03-31 13F IDEXX LABS COM 45168D104 117,543 -293,540 -71.41 63,465 -72.19 0.2244
2024-02-14 2023-12-31 13F IDEXX LABS COM 45168D104 411,083 -31,876 -7.20 228,172 17.80 0.8121
2023-11-14 2023-09-30 13F IDEXX LABS COM 45168D104 442,959 -200,788 -31.19 193,693 -40.09 0.7936
2023-08-14 2023-06-30 13F IDEXX LABS COM 45168D104 643,747 -53,869 -7.72 323,309 -7.32 1.2033
2023-05-15 2023-03-31 13F IDEXX LABS COM 45168D104 697,616 -327,434 -31.94 348,864 -16.58 1.2414
2023-02-14 2022-12-31 13F IDEXX LABS COM 45168D104 1,025,050 -54,080 -5.01 418,179 119,039.32 1.5725
2022-11-14 2022-09-30 13F IDEXX LABS COM 45168D104 1,079,130 -135,997 -11.19 352 -17.61 1.2261
2022-08-15 2022-06-30 13F IDEXX LABS COM 45168D104 1,215,127 1,062,844 697.94 426 413.25 1.3646
2022-05-16 2022-03-31 13F IDEXX LABS COM 45168D104 152,283 46,460 43.90 83 20.29 0.2698
2022-02-14 2021-12-31 13F IDEXX LABS COM 45168D104 105,823 -695 -0.65 70 -99.90 0.1900
2021-11-15 2021-09-30 13F IDEXX LABS COM 45168D104 106,518 -13,704 -11.40 66,244 -12.75 0.2225
2021-08-16 2021-06-30 13F IDEXX LABS COM 45168D104 120,222 -15,088 -11.15 75,926 14.68 0.2597
2021-05-17 2021-03-31 13F IDEXX LABS COM 45168D104 135,310 -77,732 -36.49 66,209 -37.83 0.2406
2021-02-16 2020-12-31 13F IDEXX LABS COM 45168D104 213,042 -3,033 -1.40 106,493 25.37 0.4373
2020-11-16 2020-09-30 13F IDEXX LABS COM 45168D104 216,075 -75,659 -25.93 84,941 -11.81 0.4175
2020-08-14 2020-06-30 13F IDEXX LABS COM 45168D104 291,734 -409,870 -58.42 96,319 -43.33 0.5533
2020-05-15 2020-03-31 13F IDEXX LABS COM 45168D104 701,604 701,604 169,957 1.1725
2020-02-14 2019-12-31 13F IDEXX LABS COM 45168D104 0 -31,162 -100.00 0 -100.00
2019-11-14 2019-09-30 13F IDEXX LABS COM 45168D104 31,162 -30,076 -49.11 8,474 -49.74 0.0574
2019-08-14 2019-06-30 13F IDEXX LABS COM 45168D104 61,238 -29,849 -32.77 16,861 -17.22 0.1148
2019-05-15 2019-03-31 13F IDEXX LABS COM 45168D104 91,087 -49,038 -35.00 20,367 -21.86 0.1379
2019-02-14 2018-12-31 13F IDEXX LABS COM 45168D104 140,125 140,125 26,066 0.1969
2018-08-14 2018-06-30 13F IDEXX LABS COM 45168D104 0 -429,006 -100.00 0 -100.00
2018-05-15 2018-03-31 13F IDEXX LABS COM 45168D104 429,006 75,410 21.33 82,107 48.49 0.6728
2018-02-14 2017-12-31 13F IDEXX LABS COM 45168D104 353,596 56,436 18.99 55,295 19.67 0.4401
2017-11-14 2017-09-30 13F IDEXX LABS COM 45168D104 297,160 -4,629 -1.53 46,205 -5.15 0.3505
2017-08-14 2017-06-30 13F IDEXX LABS COM 45168D104 301,789 -634,453 -67.77 48,715 -66.35 0.3470
2017-05-15 2017-03-31 13F IDEXX LABS COM 45168D104 936,242 -1,141,061 -54.93 144,752 -40.58 1.0786
2017-02-14 2016-12-31 13F IDEXX LABS COM 45168D104 2,077,303 -106,710 -4.89 243,605 -1.06 1.9941
2016-11-14 2016-09-30 13F IDEXX LABS COM 45168D104 2,184,013 -723,904 -24.89 246,204 -8.82 2.1265
2016-08-15 2016-06-30 13F IDEXX LABS COM 45168D104 2,907,917 -847,261 -22.56 270,029 -8.19 2.3724
2016-05-17 2016-03-31 13F IDEXX LABS COM 45168D104 3,755,178 -372,121 -9.02 294,106 -2.28 2.4663
2016-02-16 2015-12-31 13F IDEXX LABS COM 45168D104 4,127,299 -16,844 -0.41 300,963 -2.19 2.8784
2015-11-16 2015-09-30 13F IDEXX LABORATORIES INC. IDX COM 45168D104 4,144,143 -27,744 -0.67 307,703 14.99 2.9296
2015-08-14 2015-06-30 13F IDEXX LABORATORIES INC. IDX COM 45168D104 4,171,887 2,620,956 168.99 267,585 11.69 2.4409
2015-05-15 2015-03-31 13F IDEXX LABORATORIES INC. IDX COM 45168D104 1,550,931 -30,200 -1.91 239,588 2.20 2.1782
2015-02-17 2014-12-31 13F IDEXX LABORATORIES INC. IDX COM 45168D104 1,581,131 54,416 3.56 234,434 30.32 2.1957
2014-11-14 2014-09-30 13F IDEXX LABORATORIES INC. IDX COM 45168D104 1,526,715 1,526,715 179,893 1.8578
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.