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 2021Meritage GroupBuy5661,022$772
Q4 2021Renaissance Technologies LLCBuy16,60056,200$42,463
Q3 2021Ariel Appreciation FundSell-19451,940$38,745
Q3 2021Matrix Private Capital GroupSell-74308$230
Q3 2021Meritage GroupSell-415456$340
Q3 2021Renaissance Technologies LLCSell-7,30039,600$29,540
Q2 2021Ariel Appreciation FundBuy83352,134$33,589
Q2 2021Meritage GroupBuy142871$561
Q2 2021Renaissance Technologies LLCSell-4,40046,900$30,217
Q1 2021Ariel Appreciation FundBuy1,99051,301$29,302
Q1 2021Matrix Private Capital GroupBuy5382$218
Q1 2021Meritage GroupBuy57729$416
Q1 2021Renaissance Technologies LLCBuy3,90051,300$29,301
Q4 2020Ariel Appreciation FundSell-15,08249,311$28,745
Q4 2020Matrix Private Capital GroupBuy377377$220
Q4 2020Meritage GroupSell-89672$392
Q3 2020Ariel Appreciation FundSell-8,29364,393$33,192
Q3 2020Meritage GroupBuy761761$392
Q3 2020Renaissance Technologies LLCBuy15,60047,400$24,433
Q2 2020Ariel Appreciation FundSell-86,12872,686$32,817
Q2 2020Renaissance Technologies LLCSell-29,90031,800$14,357
Q1 2020Ariel Appreciation FundSell-67,684158,814$55,674
Q1 2020Renaissance Technologies LLCSell-16,70061,700$21,630
Q4 2019Ariel Appreciation FundBuy2,326226,498$83,811
Q4 2019Renaissance Technologies LLCBuy25,10078,400$29,010
Q3 2019Ariel Appreciation FundSell-7,146224,172$74,591
Q3 2019Renaissance Technologies LLCSell-78,60053,300$17,735
Q2 2019Ariel Appreciation FundSell-9,031231,318$72,308
Q2 2019Renaissance Technologies LLCSell-24,900131,900$41,231
Q1 2019Ariel Appreciation FundBuy16,011240,349$73,470

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.