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 Form 13F filings. 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
Q1 2026FundsmithSell-410,2491,465,786$823,610,496
Q1 2026Polen Capital ManagementSell-264,726695,811$390,969,243
Q1 2026Fundsmith Investment ServicesSell-72,273481,586$270,598,358
Q1 2026Renaissance Technologies LLCBuy23,50448,504$27,253,913
Q1 2026Parnassus Endeavor FundSell-94232,709$18,378,860
Q1 2026Sequoia Financial AdvisorsBuy7164,701$2,641,220
Q1 2026Mairs & Power Growth FundSell-512,080$1,168,731
Q1 2026Jensen Investment ManagementSell-13,570$2,005,947
Q4 2025FundsmithSell-734,4221,876,035$1,269,193,959
Q4 2025Polen Capital ManagementSell-166,610960,537$649,831,919
Q4 2025Fundsmith Investment ServicesSell-134,498553,859$374,702,229
Q4 2025Jensen Investment ManagementSell-8593,571$2,415,889
Q4 2025Parnassus Endeavor FundBuy77433,651$22,765,911
Q4 2025Sequoia Financial AdvisorsBuy7483,985$2,695,690
Q4 2025Mairs & Power Growth FundSell-132,131$1,441,685
Q3 2025Fundsmith Investment ServicesSell-156,259688,357$439,784,404
Q3 2025Polen Capital ManagementSell-68,2781,127,147$720,123,065
Q3 2025FundsmithSell-28,8322,610,457$1,667,794,873
Q3 2025Jensen Investment ManagementSell-5,9804,430$2,830,283
Q3 2025Sequoia Financial AdvisorsBuy5433,237$2,067,820
Q3 2025Parnassus Endeavor FundSell-36032,877$21,004,787
Q3 2025Mairs & Power Growth FundSell-802,144$1,369,780
Q2 2025Polen Capital ManagementBuy1,195,4251,195,425$641,154,277
Q2 2025Fundsmith Investment ServicesSell-9,743844,616$453,001,345
Q2 2025FundsmithSell-9,0422,639,289$1,415,556,262
Q2 2025Parnassus Endeavor FundSell-3,41633,237$17,826,333
Q2 2025Jensen Investment ManagementBuy2,22010,410$5,583,299
Q2 2025Sequoia Financial AdvisorsBuy7572,694$1,445,099
Q2 2025Mairs & Power Growth FundSell-822,224$1,192,820
Q2 2025Lountzis Asset ManagementBuy1232,708$17,542,609

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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