IDEXX LABORATORIES INC (IDXX) Institutional Ownership Changes & 13F Activity

IDEXX LABORATORIES INC (IDXX) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Fundsmith, Polen Capital Management, Fundsmith Investment Services, Renaissance Technologies LLC, and Parnassus Endeavor Fund.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q3 2022Fundsmith Investment ServicesSell-1,389997,876$325,108
Q3 2022Torray FundBuy1,14810,423$3,396
Q3 2022Sequoia Financial AdvisorsSell-124867$282
Q3 2022Mairs & Power Growth FundSell-943,503$1,141
Q2 2022Renaissance Technologies LLCBuy191,704217,504$76,285
Q2 2022Durable Capital PartnersBuy87,764113,166$39,691
Q2 2022Fundsmith Investment ServicesBuy46,837999,265$350,472
Q2 2022FundsmithBuy8133,618,875$1,269,248
Q2 2022Mairs & Power Growth FundBuy793,597$1,262
Q2 2022Torray FundBuy89,275$3,253
Q2 2022Sequoia Financial AdvisorsSell-1991$348
Q1 2022Fundsmith Investment ServicesBuy952,428952,428$521,035
Q1 2022FundsmithSell-624,2213,618,062$1,979,297
Q1 2022Renaissance Technologies LLCBuy18,50025,800$14,114
Q1 2022Torray FundSell-3169,267$5,070
Q1 2022Sequoia Financial AdvisorsBuy134992$543
Q1 2022Mairs & Power Growth FundBuy1283,518$1,925
Q4 2021Renaissance Technologies LLCSell-79,9047,300$4,807
Q4 2021Torray FundSell-7539,583$6,310
Q4 2021Sequoia Financial AdvisorsBuy142858$565
Q4 2021FundsmithBuy814,242,283$2,793,374
Q4 2021Mairs & Power Growth FundSell-143,390$2,232
Q3 2021Durable Capital PartnersSell-93,85925,402$15,798
Q3 2021Parnassus Endeavor FundSell-8,87362,395$38,803
Q3 2021FundsmithSell-2604,242,202$2,638,225
Q3 2021Torray FundSell-19210,336$6,428
Q2 2021FundsmithBuy21,8504,242,462$2,679,327
Q2 2021Durable Capital PartnersSell-3,689119,261$75,319
Q2 2021Torray FundSell-59010,528$6,649
Q2 2021Sequoia Financial AdvisorsBuy4716$452

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.

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