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
Q1 2019Renaissance Technologies LLCBuy92,500156,800$47,931
Q4 2018Ariel Appreciation FundSell-8,323224,338$52,096
Q4 2018Renaissance Technologies LLCSell-7,90064,300$14,932
Q3 2018Ariel Appreciation FundBuy685232,661$72,821
Q3 2018Renaissance Technologies LLCSell-271,50072,200$22,598
Q2 2018Ariel Appreciation FundSell-19,153231,976$66,934
Q1 2018Ariel Appreciation FundSell-16,391251,129$62,802
Q1 2018Renaissance Technologies LLCBuy38,400343,700$85,952
Q4 2017Ariel Appreciation FundSell-256,724267,520$63,849
Q4 2017Renaissance Technologies LLCBuy214,700305,300$72,866
Q3 2017Ariel Appreciation FundSell-49,993524,244$116,498
Q3 2017Renaissance Technologies LLCBuy4,10090,600$20,133
Q2 2017Ariel Appreciation FundSell-100,123574,237$129,956
Q2 2017Renaissance Technologies LLCSell-3,50086,500$19,576
Q1 2017Ariel Appreciation FundSell-212,467674,360$134,427
Q1 2017Renaissance Technologies LLCBuy58,80090,000$17,941
Q4 2016Ariel Appreciation FundSell-71,219886,827$161,651
Q4 2016Renaissance Technologies LLCSell-11,80031,200$5,687
Q3 2016Ariel Appreciation FundSell-22,805958,046$156,938
Q3 2016Renaissance Technologies LLCSell-4,10043,000$7,044
Q2 2016Ariel Appreciation FundSell-23,641980,851$140,281
Q2 2016Renaissance Technologies LLCSell-97,80047,100$6,736
Q1 2016Ariel Appreciation FundSell-1,4551,004,492$137,334
Q1 2016Renaissance Technologies LLCBuy63,400144,900$19,811
Q4 2015Ariel Appreciation FundBuy5,7861,005,947$139,485
Q4 2015Renaissance Technologies LLCSell-8,02081,500$11,301
Q3 2015Ariel Appreciation FundSell-122,8221,000,161$134,332
Q3 2015Renaissance Technologies LLCBuy30,02089,520$12,023
Q2 2015Ariel Appreciation FundSell-18,1591,122,983$169,132
Q2 2015Renaissance Technologies LLCSell-57,70059,500$8,961

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.