BIO-RAD LABORATORIES-A (BIO) Institutional Ownership Changes & 13F Activity

BIO-RAD LABORATORIES-A (BIO) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Longleaf Partners, First Eagle U.S. Value, Ariel Appreciation Fund, Parnassus Endeavor Fund, and Sequoia Financial Advisors.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q4 2019Renaissance Technologies LLCBuy25,10078,400$29,010
Q4 2019Ariel Appreciation FundBuy2,326226,498$83,811
Q3 2019Renaissance Technologies LLCSell-78,60053,300$17,735
Q3 2019Ariel Appreciation FundSell-7,146224,172$74,591
Q2 2019Renaissance Technologies LLCSell-24,900131,900$41,231
Q2 2019Ariel Appreciation FundSell-9,031231,318$72,308
Q1 2019Renaissance Technologies LLCBuy92,500156,800$47,931
Q1 2019Ariel Appreciation FundBuy16,011240,349$73,470
Q4 2018Ariel Appreciation FundSell-8,323224,338$52,096
Q4 2018Renaissance Technologies LLCSell-7,90064,300$14,932
Q3 2018Renaissance Technologies LLCSell-271,50072,200$22,598
Q3 2018Ariel Appreciation FundBuy685232,661$72,821
Q2 2018Ariel Appreciation FundSell-19,153231,976$66,934
Q1 2018Renaissance Technologies LLCBuy38,400343,700$85,952
Q1 2018Ariel Appreciation FundSell-16,391251,129$62,802
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 2016Renaissance Technologies LLCSell-97,80047,100$6,736
Q2 2016Ariel Appreciation FundSell-23,641980,851$140,281
Q1 2016Renaissance Technologies LLCBuy63,400144,900$19,811

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.

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