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
Q4 2025Jensen Investment ManagementSell-8593,571$2,415,889
Q4 2025Mairs & Power Growth FundSell-132,131$1,441,685
Q4 2025Polen Capital ManagementSell-166,610960,537$649,831,919
Q4 2025FundsmithSell-734,4221,876,035$1,269,193,959
Q3 2025Jensen Investment ManagementSell-5,9804,430$2,830,283
Q3 2025Mairs & Power Growth FundSell-802,144$1,369,780
Q3 2025Sequoia Financial AdvisorsBuy5433,237$2,067,820
Q3 2025Parnassus Endeavor FundSell-36032,877$21,004,787
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
Q2 2025Jensen Investment ManagementBuy2,22010,410$5,583,299
Q2 2025Lountzis Asset ManagementBuy1232,708$17,542,609
Q2 2025Mairs & Power Growth FundSell-822,224$1,192,820
Q2 2025Sequoia Financial AdvisorsBuy7572,694$1,445,099
Q2 2025Parnassus Endeavor FundSell-3,41633,237$17,826,333
Q2 2025Fundsmith Investment ServicesSell-9,743844,616$453,001,345
Q2 2025Polen Capital ManagementBuy1,195,4251,195,425$641,154,277
Q2 2025FundsmithSell-9,0422,639,289$1,415,556,262
Q1 2025Jensen Investment ManagementSell-8308,190$3,439,391
Q1 2025Lountzis Asset ManagementBuy32,69632,696$14,189,737
Q1 2025Sequoia Financial AdvisorsBuy2521,937$813,368
Q1 2025Mairs & Power Growth FundSell-962,306$968,405
Q1 2025Parnassus Endeavor FundSell-11,69436,653$15,392,427
Q1 2025Durable Capital PartnersBuy156,727364,757$153,179,702
Q1 2025Fundsmith Investment ServicesSell-10,649854,359$358,788,062
Q1 2025FundsmithSell-14,5242,648,331$1,112,166,603
Q4 2024Jensen Investment ManagementBuy9309,020$3,729,229
Q4 2024Sequoia Financial AdvisorsBuy981,685$696,573
Q4 2024Mairs & Power Growth FundSell-1002,402$993,083

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.