BIO-RAD LABORATORIES-A (BIO) Stock Institutional Trading Activity


BIO-RAD LABORATORIES-A (BIO) 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 Ariel Appreciation Fund, Longleaf Partners, First Eagle U.S. Value, Parnassus Endeavor Fund, and Meritage Group. 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 2023Ariel Appreciation FundSell-524,477$1,445,579
Q4 2023Longleaf PartnersBuy37,956364,058$117,550,687
Q4 2023Meritage GroupBuy64817$264
Q4 2023First Eagle U.S. ValueBuy21479$154,664
Q4 2023Sequoia Financial AdvisorsSell-25831$268,322
Q4 2023Parnassus Endeavor FundBuy16,999237,790$76,780,013
Q3 2023Ariel Appreciation FundBuy1364,529$1,623,420
Q3 2023Longleaf PartnersBuy583326,102$116,891,261
Q3 2023First Eagle U.S. ValueBuy267458$164,170
Q3 2023Parnassus Endeavor FundBuy220,791220,791$79,142,534
Q2 2023Ariel Appreciation FundSell-27,4044,393$1,665,474
Q2 2023Longleaf PartnersBuy325,519325,519$123,410,764
Q2 2023Meritage GroupBuy284753$285
Q2 2023Renaissance Technologies LLCSell-37,1001,100$417
Q2 2023First Eagle U.S. ValueBuy191191$72,412
Q2 2023Sequoia Financial AdvisorsBuy856856$324,527
Q1 2023Ariel Appreciation FundSell-9931,797$15,231,398
Q1 2023Renaissance Technologies LLCSell-63,94338,200$18,299
Q4 2022Ariel Appreciation FundSell-34,76931,896$13,411,948
Q4 2022Renaissance Technologies LLCBuy39,443102,143$42,950
Q3 2022Ariel Appreciation FundBuy2,76266,665$27,808
Q3 2022Renaissance Technologies LLCSell-91,80062,700$26,155
Q2 2022Ariel Appreciation FundBuy2,16763,903$31,632
Q2 2022Meritage GroupSell-324469$232
Q2 2022Renaissance Technologies LLCSell-33,300154,500$76,478
Q1 2022Ariel Appreciation FundBuy5,98661,736$34,771
Q1 2022Meritage GroupSell-229793$447
Q1 2022Renaissance Technologies LLCBuy131,600187,800$105,775
Q4 2021Ariel Appreciation FundBuy3,81055,750$42,123
Q4 2021Matrix Private Capital GroupSell-1307$232

Frequently asked questions about BIO activity

  • Which institutional owners are buying BIO?

    Institutional owners buying BIO 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 BIO activity?

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

  • Is institutional interest in BIO increasing?

    Institutional interest in BIO 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.