Stock Ownership/BSX

BOSTON SCIENTIFIC CORP (BSX): Ownership & Insider Activity

Hedge funds and institutional managers reporting a position in BSX · Health Care. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.

Reported Holders
48
13F filers
Aggregate Value
$8.4B
Across holders
Last Price
$49.01
2026-08-24
Sector
Health Care
GICS
Quarterly fund activity30 increased18 reduced7 exited
Full exits: CAXTON ASSOCIATES LLP, Davidson Kempner Capital Management LP, LONE PINE CAPITAL LLC, FRED ALGER MANAGEMENT, LLC, Magnetar Financial LLC, SANDS CAPITAL MANAGEMENT, LLC, Rokos Capital Management LLP
Institutional Holders of BSX
↗
48 holders
Manager⇅Type⇅Shares⇅Market Value▼% of Total⇅% of Portfolio⇅Action⇅QoQ Change⇅Quarter⇅
PRIMECAP MANAGEMENT CO/CA/
CIK 0000763212
Institutional Manager50.52M$2.2B25.6%1.3%Added+$767.9MQ2 2026
SHAW D E & CO INC
CIK 0001009207
Hedge Fund25.46M$1.1B12.9%0.5%Added$-652.3MQ2 2026
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
CIK 0001164508
Hedge Fund23.29M$994.2M11.8%0.4%Added+$401.3MQ2 2026
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
Hedge Fund19.36M$826.2M9.8%0.6%Added+$424.6MQ2 2026
FARALLON CAPITAL MANAGEMENT LLC
CIK 0000909661
Hedge Fund10.52M$449.0M5.3%2.1%Added+$130.2MQ2 2026
AQR CAPITAL MANAGEMENT LLC
CIK 0001167557
Hedge Fund9.68M$413.2M4.9%0.1%Added+$412.9MQ2 2026
Qube Research & Technologies Ltd
CIK 0001729829
Hedge Fund8.94M$381.7M4.5%0.4%Added+$380.4MQ2 2026
MAVERICK CAPITAL LTD
CIK 0000934639
Hedge Fund5.94M$253.4M3.0%2.2%Added+$74.4MQ2 2026
Clearbridge Investments, LLC
CIK 0001348883
Hedge Fund5.13M$219.0M2.6%0.2%Added+$121.7MQ2 2026
CITADEL ADVISORS LLC
CIK 0001423053
Hedge Fund4.99M$212.9M2.5%0.0%Added+$92.5MQ2 2026
PRIMECAP MANAGEMENT CO/CA/Added
Institutional Manager
$2.2B· 25.6% of total· 1.3% port· 50.52M sh· +$767.9M QoQ· Q2 2026
SHAW D E & CO INCAdded
Hedge Fund
$1.1B· 12.9% of total· 0.5% port· 25.46M sh· $-652.3M QoQ· Q2 2026
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPAdded
Hedge Fund
$994.2M· 11.8% of total· 0.4% port· 23.29M sh· +$401.3M QoQ· Q2 2026
TWO SIGMA INVESTMENTS, LPAdded
Hedge Fund
$826.2M· 9.8% of total· 0.6% port· 19.36M sh· +$424.6M QoQ· Q2 2026
FARALLON CAPITAL MANAGEMENT LLCAdded
Hedge Fund
$449.0M· 5.3% of total· 2.1% port· 10.52M sh· +$130.2M QoQ· Q2 2026
AQR CAPITAL MANAGEMENT LLCAdded
Hedge Fund
$413.2M· 4.9% of total· 0.1% port· 9.68M sh· +$412.9M QoQ· Q2 2026
Qube Research & Technologies LtdAdded
Hedge Fund
$381.7M· 4.5% of total· 0.4% port· 8.94M sh· +$380.4M QoQ· Q2 2026
MAVERICK CAPITAL LTDAdded
Hedge Fund
$253.4M· 3.0% of total· 2.2% port· 5.94M sh· +$74.4M QoQ· Q2 2026
Clearbridge Investments, LLCAdded
Hedge Fund
$219.0M· 2.6% of total· 0.2% port· 5.13M sh· +$121.7M QoQ· Q2 2026
CITADEL ADVISORS LLCAdded
Hedge Fund
$212.9M· 2.5% of total· 0.0% port· 4.99M sh· +$92.5M QoQ· Q2 2026
MILLENNIUM MANAGEMENT LLCAdded
Hedge Fund
$210.7M· 2.5% of total· 0.1% port· 5.44M sh· +$204.3M QoQ· Q2 2026
VOLORIDGE INVESTMENT MANAGEMENT, LLCAdded
Hedge Fund
$139.8M· 1.7% of total· 0.6% port· 3.28M sh· +$93.8M QoQ· Q2 2026
Man Group plcReduced
Hedge Fund
$137.7M· 1.6% of total· 0.2% port· 3.23M sh· $-330.0M QoQ· Q2 2026
MARSHALL WACE, LLPReduced
Hedge Fund
$103.0M· 1.2% of total· 0.1% port· 2.41M sh· +$103.0M QoQ· Q2 2026
RENAISSANCE TECHNOLOGIES LLCReduced
Hedge Fund
$102.9M· 1.2% of total· 0.1% port· 2.41M sh· $-31.6M QoQ· Q2 2026
ADAGE CAPITAL PARTNERS GP, L.L.C.Reduced
Hedge Fund
$71.3M· 0.8% of total· 0.1% port· 1.67M sh· $-126.5M QoQ· Q2 2026
Squarepoint Ops LLCAdded
Hedge Fund
$69.4M· 0.8% of total· 0.1% port· 1.62M sh· +$57.9M QoQ· Q2 2026
Walleye Capital LLCAdded
Hedge Fund
$67.4M· 0.8% of total· 0.2% port· 1.58M sh· +$63.2M QoQ· Q2 2026
ORBIMED ADVISORS LLCReduced
Hedge Fund
$63.3M· 0.8% of total· 1.2% port· 1.48M sh· $-38.4M QoQ· Q2 2026
TUDOR INVESTMENT CORP ET ALAdded
Hedge Fund
$63.1M· 0.7% of total· 0.1% port· 1.48M sh· +$54.0M QoQ· Q2 2026
TCW GROUP INCReduced
Hedge Fund
$57.7M· 0.7% of total· 0.4% port· 1.35M sh· +$43.0M QoQ· Q2 2026
Schonfeld Strategic Advisors LLCAdded
Hedge Fund
$56.6M· 0.7% of total· 0.2% port· 1.33M sh· +$9.5M QoQ· Q2 2026
JUPITER ASSET MANAGEMENT LTDAdded
Hedge Fund
$36.6M· 0.4% of total· 0.2% port· 848K sh· — QoQ· Q2 2026
Holocene Advisors, LPReduced
Hedge Fund
$34.4M· 0.4% of total· 0.1% port· 807K sh· $-111.9M QoQ· Q2 2026
Hudson Bay Capital Management LPAdded
Hedge Fund
$31.7M· 0.4% of total· 0.1% port· 743K sh· $-9.6M QoQ· Q2 2026
Rockefeller Capital Management L.P.Added
Hedge Fund
$30.8M· 0.4% of total· 0.0% port· 721K sh· $-158.6M QoQ· Q2 2026
ExodusPoint Capital Management, LPAdded
Hedge Fund
$21.6M· 0.3% of total· 0.1% port· 505K sh· — QoQ· Q2 2026
Bridgewater Associates, LPAdded
Hedge Fund
$18.9M· 0.2% of total· 0.1% port· 442K sh· +$15.6M QoQ· Q2 2026
Verition Fund Management LLCAdded
Hedge Fund
$17.5M· 0.2% of total· 0.1% port· 410K sh· +$17.3M QoQ· Q2 2026
Gotham Asset Management, LLCReduced
Hedge Fund
$16.0M· 0.2% of total· 0.0% port· 375K sh· $-4.6M QoQ· Q2 2026
Point72 Asset Management, L.P.Reduced
Hedge Fund
$15.6M· 0.2% of total· 0.0% port· 365K sh· +$14.2M QoQ· Q2 2026
Fisher Asset Management, LLCReduced
Institutional Manager
$14.2M· 0.2% of total· 0.0% port· 334K sh· $-5.0M QoQ· Q2 2026
Woodline Partners LPAdded
Hedge Fund
$13.8M· 0.2% of total· 0.0% port· 324K sh· +$1.4M QoQ· Q2 2026
MOORE CAPITAL MANAGEMENT, LPAdded
Hedge Fund
$8.1M· 0.1% of total· 0.1% port· 189K sh· — QoQ· Q2 2026
Parallax Volatility Advisers, L.P.Added
Hedge Fund
$5.8M· 0.1% of total· 0.0% port· 135K sh· $-2.8M QoQ· Q2 2026
CAPSTONE INVESTMENT ADVISORS, LLCAdded
Hedge Fund
$5.2M· 0.1% of total· 0.0% port· 121K sh· $-1.5M QoQ· Q2 2026
GLENVIEW CAPITAL MANAGEMENT LLCAdded
Hedge Fund
$4.8M· 0.1% of total· 0.1% port· 113K sh· — QoQ· Q2 2026
DODGE & COXReduced
Institutional Manager
$3.7M· 0.0% of total· 0.0% port· 87K sh· $-60K QoQ· Q2 2026
Pinpoint Asset Management LtdReduced
Hedge Fund
$3.3M· 0.0% of total· 0.6% port· 33K sh· $-2.6M QoQ· Q1 2025
BALYASNY ASSET MANAGEMENT LLCReduced
Hedge Fund
$3.0M· 0.0% of total· 0.0% port· 71K sh· $-54.8M QoQ· Q2 2026
Brevan Howard Capital Management LPReduced
Hedge Fund
$2.9M· 0.0% of total· 0.0% port· 69K sh· +$2.4M QoQ· Q2 2026
GAMCO INVESTORS, INC. ET ALReduced
Institutional Manager
$2.8M· 0.0% of total· 0.0% port· 65K sh· $-3.9M QoQ· Q2 2026
Fulcrum Asset Management LLPAdded
Hedge Fund
$2.1M· 0.0% of total· 0.2% port· 48K sh· $-1.6M QoQ· Q2 2026
Lighthouse Investment Partners, LLCReduced
Hedge Fund
$1.3M· 0.0% of total· 0.0% port· 30K sh· +$939 QoQ· Q2 2026
Grantham, Mayo, Van Otterloo & Co. LLCAdded
Institutional Manager
$930K· 0.0% of total· 0.0% port· 22K sh· +$290K QoQ· Q2 2026
Bridgewater Advisors Inc.Added
Hedge Fund
$465K· 0.0% of total· 0.0% port· 10K sh· +$1K QoQ· Q2 2026
PineBridge Investments, L.P.Reduced
Hedge Fund
$344K· 0.0% of total· 0.0% port· 4K sh· $-4.8M QoQ· Q3 2025
Ancora Advisors, LLCReduced
Hedge Fund
$153K· 0.0% of total· 0.0% port· 4K sh· +$68K QoQ· Q2 2026
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