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
$42.04
2026-10-08
Sector
Health Care
GICS
Quarterly fund activity30 increased18 reduced6 exited
Full exits: CAXTON ASSOCIATES LLP, 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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