BOSTON SCIENTIFIC CORP (BSX) Institutional Ownership Changes & 13F Activity

BOSTON SCIENTIFIC CORP (BSX) 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 Polen Capital Management, Renaissance Technologies LLC, Parnassus Endeavor Fund, Lone Pine Capital, and Sequoia Financial Advisors.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q2 2016Renaissance Technologies LLCBuy4,283,5004,901,905$114,558
Q2 2016Dodge & Cox Stock FundSell-42,500384,930$8,996
Q1 2016Renaissance Technologies LLCSell-2,853,300618,405$11,632
Q1 2016Dodge & Cox Stock FundSell-23,400427,430$8,040
Q4 2015Renaissance Technologies LLCBuy624,4003,471,705$64,018
Q4 2015Dodge & Cox Stock FundSell-22,130450,830$8,313
Q3 2015Viking Global InvestorsBuy1,611,9351,611,935$26,452
Q3 2015Dodge & Cox Stock FundSell-115,300472,960$7,761
Q2 2015Renaissance Technologies LLCSell-946,3502,847,305$50,397
Q2 2015Dodge & Cox Stock FundSell-141,200588,260$10,412
Q1 2015Renaissance Technologies LLCSell-1,539,6503,793,655$67,337
Q1 2015Dodge & Cox Stock FundSell-455,270729,460$12,948
Q4 2014Dodge & Cox Stock FundSell-43,273,6081,184,730$15,698
Q4 2014Renaissance Technologies LLCBuy3,123,4005,333,305$70,666
Q3 2014Renaissance Technologies LLCBuy1,669,7002,209,905$26,099
Q3 2014Dodge & Cox Stock FundSell-414,48044,458,338$525,053
Q2 2014Renaissance Technologies LLCSell-954,200540,205$6,898
Q2 2014Dodge & Cox Stock FundSell-351,35044,872,818$573,026
Q1 2014Renaissance Technologies LLCSell-2,864,2151,494,405$20,204
Q1 2014Dodge & Cox Stock FundSell-714,30045,224,168$611,431
Q4 2013Dodge & Cox Stock FundSell-13,218,63945,938,468$552,180
Q4 2013Renaissance Technologies LLCSell-444,8854,358,620$52,391
Q3 2013Dodge & Cox Stock FundSell-22,644,02359,157,107$694,504
Q3 2013Renaissance Technologies LLCSell-5,535,8004,803,505$56,393
Q2 2013Dodge & Cox Stock FundBuy81,801,13081,801,130$758,296
Q2 2013Renaissance Technologies LLCBuy10,339,30510,339,305$95,845

Frequently asked questions about BSX activity

  • Which institutional owners are buying BSX?

    Institutional owners buying BSX 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 BSX activity?

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

  • Is institutional interest in BSX increasing?

    Institutional interest in BSX 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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