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 2021Parnassus Endeavor FundBuy6,259,42415,112,760$646,222
Q2 2021Viking Global InvestorsSell-4,580,28613,315,816$569,384
Q2 2021Dodge & Cox Stock FundSell-1,200130,090$5,563
Q1 2021Viking Global InvestorsSell-12,094,79017,896,102$691,684
Q1 2021Parnassus Endeavor FundBuy8,853,3368,853,336$342,182
Q1 2021Dodge & Cox Stock FundSell-1,700131,290$5,074
Q4 2020Viking Global InvestorsBuy11,161,16229,990,892$1,078,173
Q4 2020Renaissance Technologies LLCBuy2,743,6002,771,205$99,625
Q4 2020Dodge & Cox Stock FundSell-5,000132,990$4,781
Q3 2020Viking Global InvestorsBuy372,45718,829,730$719,484
Q3 2020Appaloosa ManagementSell-162,500787,500$30,090
Q3 2020Dodge & Cox Stock FundSell-5,100137,990$5,273
Q2 2020Viking Global InvestorsSell-13,358,92418,457,273$648,035
Q2 2020Appaloosa ManagementBuy835,000950,000$33,355
Q2 2020Renaissance Technologies LLCSell-91,22427,605$969
Q2 2020Dodge & Cox Stock FundSell-21,750143,090$5,024
Q1 2020Viking Global InvestorsBuy13,324,53531,816,197$1,038,163
Q1 2020Appaloosa ManagementSell-738,875115,000$3,752
Q1 2020Dodge & Cox Stock FundSell-9,600164,840$5,379
Q4 2019Viking Global InvestorsBuy8,075,61518,491,662$836,193
Q4 2019Mairs & Power Growth FundBuy6,8186,818$308
Q4 2019Dodge & Cox Stock FundSell-200174,440$7,888
Q3 2019Viking Global InvestorsBuy1,220,85510,416,047$423,829
Q3 2019Third PointSell-500,0005,000,000$203,450
Q3 2019Dodge & Cox Stock FundSell-2,000174,640$7,106
Q2 2019Viking Global InvestorsBuy5,974,8239,195,192$395,209
Q2 2019Renaissance Technologies LLCSell-2,072,100118,829$5,107
Q2 2019Third PointBuy500,0005,500,000$236,390
Q2 2019Dodge & Cox Stock FundSell-105176,640$7,592
Q1 2019Third PointBuy5,000,0005,000,000$191,900

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