BOSTON SCIENTIFIC CORP (BSX) Stock Institutional Trading Activity


BOSTON SCIENTIFIC CORP (BSX) 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 Polen Capital Management, Renaissance Technologies LLC, Lone Pine Capital, Viking Global Investors, and Mairs & Power Growth Fund. 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
Q4 2020Viking Global InvestorsBuy11,161,16229,990,892$1,078,173
Q3 2020Dodge & Cox Stock FundSell-5,100137,990$5,273
Q3 2020Appaloosa ManagementSell-162,500787,500$30,090
Q3 2020Viking Global InvestorsBuy372,45718,829,730$719,484
Q2 2020Dodge & Cox Stock FundSell-21,750143,090$5,024
Q2 2020Renaissance Technologies LLCSell-91,22427,605$969
Q2 2020Appaloosa ManagementBuy835,000950,000$33,355
Q2 2020Viking Global InvestorsSell-13,358,92418,457,273$648,035
Q1 2020Dodge & Cox Stock FundSell-9,600164,840$5,379
Q1 2020Appaloosa ManagementSell-738,875115,000$3,752
Q1 2020Viking Global InvestorsBuy13,324,53531,816,197$1,038,163
Q4 2019Mairs & Power Growth FundBuy6,8186,818$308
Q4 2019Dodge & Cox Stock FundSell-200174,440$7,888
Q4 2019Viking Global InvestorsBuy8,075,61518,491,662$836,193
Q3 2019Dodge & Cox Stock FundSell-2,000174,640$7,106
Q3 2019Third PointSell-500,0005,000,000$203,450
Q3 2019Viking Global InvestorsBuy1,220,85510,416,047$423,829
Q2 2019Dodge & Cox Stock FundSell-105176,640$7,592
Q2 2019Renaissance Technologies LLCSell-2,072,100118,829$5,107
Q2 2019Third PointBuy500,0005,500,000$236,390
Q2 2019Viking Global InvestorsBuy5,974,8239,195,192$395,209
Q1 2019Dodge & Cox Stock FundSell-20,065176,745$6,783
Q1 2019Renaissance Technologies LLCBuy1,096,6242,190,929$84,088
Q1 2019Viking Global InvestorsSell-1,981,4593,220,369$123,598
Q1 2019Third PointBuy5,000,0005,000,000$191,900
Q4 2018Dodge & Cox Stock FundSell-7,445196,810$6,955
Q4 2018Viking Global InvestorsBuy2,045,8275,201,828$183,833
Q3 2018Dodge & Cox Stock FundSell-7,700204,255$7,864
Q3 2018Appaloosa ManagementSell-1,674,263853,875$32,874
Q3 2018Viking Global InvestorsBuy1,544,0663,156,001$121,506

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.