IDEXX LABORATORIES INC (IDXX) Stock Institutional Trading Activity


IDEXX LABORATORIES INC (IDXX) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Fundsmith, Polen Capital Management, Jensen Investment Management, Mairs & Power Growth Fund, and Fundsmith Investment Services. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q2 2023Torray FundSell-3479,784$4,913,818
Q2 2023Fundsmith Investment ServicesBuy15,1081,019,528$512,037,547
Q2 2023FundsmithBuy7,3552,961,551$1,487,379,759
Q2 2023Sequoia Financial AdvisorsBuy341,672$839,729
Q1 2023Torray FundSell-18310,131$5,066,310
Q1 2023Fundsmith Investment ServicesBuy3241,004,420$502,290,354
Q1 2023FundsmithSell-489,5362,954,196$1,477,334,336
Q1 2023Sequoia Financial AdvisorsBuy551,638$819,132
Q1 2023Mairs & Power Growth FundSell-2672,828$1,414,226
Q1 2023Parnassus Endeavor FundSell-13,41248,983$24,495,419
Q4 2022Torray FundSell-10910,314$4,207,699
Q4 2022Fundsmith Investment ServicesBuy6,2201,004,096$409,631,004
Q4 2022FundsmithSell-177,0453,443,732$1,404,904,907
Q4 2022Sequoia Financial AdvisorsBuy7161,583$645,863
Q4 2022Mairs & Power Growth FundSell-4083,095$1,262,636
Q4 2022Durable Capital PartnersBuy316208,030$84,867,919
Q3 2022Torray FundBuy1,14810,423$3,396
Q3 2022Fundsmith Investment ServicesSell-1,389997,876$325,108
Q3 2022FundsmithBuy1,9023,620,777$1,179,649
Q3 2022Sequoia Financial AdvisorsSell-124867$282
Q3 2022Mairs & Power Growth FundSell-943,503$1,141
Q3 2022Renaissance Technologies LLCSell-159,50058,004$18,898
Q3 2022Durable Capital PartnersBuy94,548207,714$67,673
Q2 2022Torray FundBuy89,275$3,253
Q2 2022Fundsmith Investment ServicesBuy46,837999,265$350,472
Q2 2022FundsmithBuy8133,618,875$1,269,248
Q2 2022Sequoia Financial AdvisorsSell-1991$348
Q2 2022Mairs & Power Growth FundBuy793,597$1,262
Q2 2022Durable Capital PartnersBuy87,764113,166$39,691
Q2 2022Renaissance Technologies LLCBuy191,704217,504$76,285

Frequently asked questions about IDXX activity

  • Which institutional owners are buying IDXX?

    Institutional owners buying IDXX include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in IDXX activity?

    "Buy" means an investor increased their reported position in IDXX compared to the prior reporting period. This reflects growing exposure to IDEXX LABORATORIES INC (IDXX) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in IDXX increasing?

    Institutional interest in IDXX can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.