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.

Explore more:

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2023Viking Global InvestorsSell-8,391,7121,136,881$56,878,156
Q4 2022Dodge & Cox Stock FundSell-2,700112,890$5,223,420
Q4 2022Parnassus Endeavor FundSell-15,686,8025,157$238,614
Q4 2022Sequoia Financial AdvisorsBuy8,42614,762$683,061
Q4 2022Viking Global InvestorsSell-6,634,3289,528,593$440,887,998
Q3 2022Dodge & Cox Stock FundSell-5,000115,590$4,477
Q3 2022Sequoia Financial AdvisorsBuy1,1326,336$245
Q3 2022Mairs & Power Growth FundBuy5,43110,768$417
Q3 2022Viking Global InvestorsBuy1,508,96716,162,921$625,990
Q2 2022Viking Global InvestorsBuy1,814,81214,653,954$546,153
Q2 2022Parnassus Endeavor FundSell-42,79115,691,959$584,839
Q1 2022Dodge & Cox Stock FundSell-5,000120,590$5,341
Q1 2022Sequoia Financial AdvisorsBuy5,2045,204$230
Q1 2022Mairs & Power Growth FundBuy5695,337$236
Q1 2022Viking Global InvestorsSell-6,122,35912,839,142$568,646
Q1 2022Parnassus Endeavor FundBuy194,21915,734,750$696,892
Q4 2021Parnassus Endeavor FundSell-23,42315,540,531$660,162
Q4 2021Dodge & Cox Stock FundSell-4,500125,590$5,335
Q4 2021Viking Global InvestorsBuy12,095,09618,961,501$805,485
Q3 2021Parnassus Endeavor FundBuy451,19415,563,954$675,320
Q3 2021Mairs & Power Growth FundSell-2,0504,768$207
Q3 2021Viking Global InvestorsSell-6,449,4116,866,405$297,933
Q2 2021Dodge & Cox Stock FundSell-1,200130,090$5,563
Q2 2021Parnassus Endeavor FundBuy6,259,42415,112,760$646,222
Q2 2021Viking Global InvestorsSell-4,580,28613,315,816$569,384
Q1 2021Parnassus Endeavor FundBuy8,853,3368,853,336$342,182
Q1 2021Dodge & Cox Stock FundSell-1,700131,290$5,074
Q1 2021Viking Global InvestorsSell-12,094,79017,896,102$691,684
Q4 2020Dodge & Cox Stock FundSell-5,000132,990$4,781
Q4 2020Renaissance Technologies LLCBuy2,743,6002,771,205$99,625

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.