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
Q1 2025Sequoia Financial AdvisorsBuy8,18438,455$3,879,339
Q1 2025Dodge & Cox Stock FundSell-3,10091,695$9,250,192
Q1 2025Parnassus Endeavor FundBuy20315,064$1,519,656
Q4 2024Viking Global InvestorsBuy1,204,9982,172,208$194,021,619
Q4 2024Sequoia Financial AdvisorsBuy3,87930,271$2,703,839
Q4 2024Dodge & Cox Stock FundSell-50094,795$8,467,089
Q4 2024Parnassus Endeavor FundBuy9714,861$1,327,384
Q3 2024Viking Global InvestorsSell-757,545967,210$81,052,198
Q3 2024Renaissance Technologies LLCSell-577,880258,025$21,622,495
Q3 2024Dodge & Cox Stock FundSell-1,80095,295$7,985,721
Q3 2024Parnassus Endeavor FundBuy1,28414,764$1,237,223
Q3 2024Sequoia Financial AdvisorsBuy9726,392$2,211,660
Q3 2024Mairs & Power Growth FundBuy4210,311$864,062
Q2 2024Parnassus Endeavor FundBuy2,02113,480$1,038,094
Q2 2024Sequoia Financial AdvisorsBuy1,66126,295$2,024,991
Q2 2024Mairs & Power Growth FundSell-20010,269$790,816
Q1 2024Viking Global InvestorsSell-543,0061,724,755$118,128,470
Q1 2024Sequoia Financial AdvisorsSell-5,56024,634$1,687,191
Q1 2024Parnassus Endeavor FundBuy1,74811,459$784,827
Q1 2024Mairs & Power Growth FundBuy13410,469$717,022
Q4 2023Viking Global InvestorsBuy1,157,4692,267,761$131,099,263
Q4 2023Sequoia Financial AdvisorsBuy11,92530,194$1,745,515
Q4 2023Parnassus Endeavor FundBuy2,0389,711$561,393
Q4 2023Mairs & Power Growth FundBuy3910,335$597,466
Q4 2023Dodge & Cox Stock FundSell-1097,095$5,613,062
Q3 2023Viking Global InvestorsSell-26,5891,110,292$58,623,418
Q3 2023Dodge & Cox Stock FundSell-1,77597,105$5,127,144
Q3 2023Sequoia Financial AdvisorsBuy93418,269$964,611
Q3 2023Mairs & Power Growth FundSell-50010,296$543,629
Q3 2023Parnassus Endeavor FundBuy2447,673$405,134

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.

Related BSX insights