Boston Scientific

BSX • NYSE

Boston Scientific is a medical - devices company in the healthcare sector on NYSE, led by Michael F. Mahoney, with a market cap of $144.86B. As of Q3 2025, 89% of shares are held by 1,651 institutional investors, with BlackRock, Inc. as the largest holder at 9.8%.

CEOMichael F. Mahoney

Market Cap$144.86B

Medical - Devices

Healthcare

Employees48.0K

Websitebostonscientific.com

Country

United States of America

Overview

Overview of institutional ownership in BSX as of Q3 2025 with a market cap of $144.66B

All Institutions

Institutions: 1,651
Value Held: $129.10B
Shares Held: 1.32B
Avg Position: $78.2M
Median Position: $1.3M

Hedge Funds

Hedge Funds: 118
Value Held: $7.9B
Shares Held: 81.2M
Avg Position: $66.8M
Median Position: $6.8M

Ownership Breakdown

Institutional (non-HF)

83.79%

$121.22B

Hedge Funds

5.45%

$7.9B

Retail & Other

10.76%

$15.6B

Based on market cap of $144.66B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in BSX as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
B BlackRock, Inc. Institution	-	$14.2B 0.25% of portfolio	9.80% 145.2M shares	≤ Q2 2013 Held for 12y 5m+	$5.67T
VANGUARD GROUP INC Institution	Salim Ramji CEO	$13.5B 0.20% of portfolio	9.33% 138.2M shares	≤ Q2 2013 Held for 12y 5m+	$6.69T
FMR LLC Institution	-	$9.7B 0.51% of portfolio	6.71% 99.5M shares	≤ Q2 2013 Held for 12y 5m+	$1.92T
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$6.3B 0.22% of portfolio	4.38% 64.9M shares	≤ Q2 2013 Held for 12y 5m+	$2.88T
BANK OF AMERICA CORP /DE/ Institution	Brian T. Moynihan CEO	$3.3B 0.25% of portfolio	2.29% 33.9M shares	≤ Q2 2013 Held for 12y 5m+	$1.33T
PRIMECAP MANAGEMENT CO/CA/ Long Only Manager	Theofanis A Kolokotrones Chairman	$3.2B 2.51% of portfolio	2.23% 33.1M shares	≤ Q2 2013 Held for 12y 5m+	$128.84B
GEODE CAPITAL MANAGEMENT LLC ETF Provider	David Kenneth Lane CEO	$3.2B 0.20% of portfolio	2.21% 32.7M shares	≤ Q2 2013 Held for 12y 5m+	$1.57T
JPMORGAN CHASE & CO Institution	Jamie Dimon CEO	$2.8B 0.18% of portfolio	1.91% 28.3M shares	≤ Q2 2013 Held for 12y 5m+	$1.56T
C Capital World Investors Institution	-	$2.6B 0.36% of portfolio	1.80% 26.6M shares	Q3 2023 Held for 2y 2m	$730.00B
MORGAN STANLEY RIA/Wealth	Jed Finn CEO	$2.0B 0.12% of portfolio	1.40% 20.7M shares	≤ Q2 2013 Held for 12y 5m+	$1.65T

Net Capital Flow

Institutional buying and selling activity for BSX in Q3 2025

Net Flow: −$635.6M
Buyers: 769
Sellers: 669
Total Bought: +$7.4B
Total Sold: −$8.0B
Avg Position: $78.0M

Biggest Buyers

Institution	Net Bought	Current Position
PARNASSUS INVESTMENTS /CA Long Only Manager	+$670.6M +6.9M shares	$672.1M 6.9M shares
Egerton Capital LLP Hedge Fund•Long/Short	+$358.5M +3.7M shares	$518.7M 5.3M shares
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	+$357.4M +3.9M shares	$783.5M 8.5M shares
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	+$341.9M +3.5M shares	$869.5M 8.9M shares
JENNISON ASSOCIATES LLC Long Only Manager	+$275.7M +2.8M shares	$482.2M 4.9M shares
JPMORGAN CHASE & CO Institution	+$260.6M +2.7M shares	$2.8B 28.3M shares
J JANE STREET GROUP, LLC Institution	+$258.9M +2.7M shares	$290.8M 3.0M shares
EDGEWOOD MANAGEMENT LLC Long Only Manager	+$229.4M +2.3M shares	$908.1M 9.3M shares
Marshall Wace LLP Institution	+$224.7M +2.3M shares	$956.7M 9.8M shares
D D. E. Shaw & Co., Inc. Institution	+$210.4M +2.2M shares	$869.9M 8.9M shares

Biggest Sellers

Institution	Net Sold	Current Position
WELLINGTON MANAGEMENT CO LLP Long Only Manager	−$1.8B −18.0M shares	$1.4B 14.7M shares
FMR LLC Institution	−$862.4M −8.8M shares	$9.7B 99.5M shares
ING INVESTMENT MANAGEMENT LLC Insurance Manager	−$425.9M −4.4M shares	$428.0M 4.4M shares
Artisan Partners Limited Partnership Long Only Manager	−$367.3M −3.8M shares	$464.3M 4.8M shares
PRICE T ROWE ASSOCIATES INC /MD/ Long Only Manager	−$258.1M −2.6M shares	$817.9M 8.4M shares
D DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main Institution	−$252.2M −2.6M shares	$1.4B 14.0M shares
A AXA Institution	−$243.5M −2.5M shares	$1.7M 17.6K shares
MASSACHUSETTS FINANCIAL SERVICES CO /MA/ Long Only Manager	−$243.3M −2.5M shares	$1.0B 10.4M shares
AMERIPRISE FINANCIAL INC Institution	−$224.2M −2.3M shares	$536.4M 5.5M shares
CITIGROUP INC Institution	−$188.1M −1.9M shares	$205.6M 2.1M shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited BSX in Q3 2025

New Positions: 91
New Value: $662.0M
Exited Positions: 130
Exited Value: $449.9M

New Positions

Institution	Position Value
POLEN CAPITAL MANAGEMENT LLC Long Only Manager	$546.6M 5.6M shares
Sone Capital Management, LLC Hedge Fund•Multi-Strategy	$18.3M 187.4K shares
GILLESPIE ROBINSON & GRIMM INC RIA/Wealth	$15.9M 162.5K shares
Spence Asset Management RIA/Wealth	$13.8M 141.3K shares
E Exane Asset Management Institution	$9.1M 79.5K shares
Prosight Management, LP Hedge Fund•Long/Short	$7.4M 76.1K shares
T Torrey Growth & Income Advisors RIA/Wealth	$6.5M 66.7K shares
F Fieldview Capital Management, LLC Hedge Fund•Long/Short	$5.3M 54.7K shares
S STRATEGIC PLANNING GROUP, LLC RIA/Wealth	$4.4M 45.0K shares
Palumbo Wealth Management LLC RIA/Wealth	$2.4M 25.3K shares

Exited Positions

Institution	Previous Position
Z Zurich Insurance Group Ltd/FI Institution	$129.8M 1.2M shares
S STEADFAST CAPITAL MANAGEMENT LP Hedge Fund•Long/Short	$117.8M 1.1M shares
T TEXAS PERMANENT SCHOOL FUND Institution	$17.3M 160.9K shares
P PGGM Investments Institution	$15.8M 147.2K shares
Science & Technology Partners, L.P. Hedge Fund•Long/Short	$15.1M 140.8K shares
F First Turn Management, LLC Hedge Fund•Long/Short	$14.9M 138.8K shares
S SIMPLEX TRADING, LLC Institution	$12.7M 118.7K shares
N Nearwater Capital Markets, Ltd Institution	$10.7M 100.0K shares
VESTOR CAPITAL CORP RIA/Wealth	$10.4M 97.3K shares
P Premier Fund Managers Ltd Institution	$9.6M 89.8K shares

Options Activity

Institutions with the largest Call and Put options positions in BSX as of Q3 2025

Call Positions: 48
Call Value: $989.7M
Put Positions: 45
Put Value: $848.5M

Call Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$205.7M 21.1K contracts
Point72 Asset Management, L.P. Hedge Fund•Multi-Strategy	$92.3M 9.5K contracts
CITIGROUP INC Institution	$88.3M 9.0K contracts
BANK OF AMERICA CORP /DE/ Institution	$84.8M 8.7K contracts
J JANE STREET GROUP, LLC Institution	$62.6M 6.4K contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$58.7M 6.0K contracts
GOLDMAN SACHS GROUP INC Institution	$41.4M 4.2K contracts
L LMR Partners LLP Institution	$37.7M 3.9K contracts
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	$37.4M 3.8K contracts
UBS Group AG Institution	$27.3M 2.8K contracts

Put Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$239.2M 24.5K contracts
J JANE STREET GROUP, LLC Institution	$100.8M 10.3K contracts
N NOMURA HOLDINGS INC Institution	$99.4M 10.2K contracts
BANK OF AMERICA CORP /DE/ Institution	$52.0M 5.3K contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$49.1M 5.0K contracts
Caption Management, LLC Hedge Fund•Long/Short	$46.7M 4.8K contracts
CITIGROUP INC Institution	$46.4M 4.8K contracts
B BNP PARIBAS ARBITRAGE, SA Institution	$31.4M 32.2 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$16.8M 1.7K contracts
L LMR Partners LLP Institution	$16.3M 1.7K contracts

Most Committed Institutions

Institutions with BSX as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
B Bollard Group LLC Family Office	Anastasios Nmn Parafestas CEO	47.95% $1.9B	1.33% 19.7M shares	≤ Q2 2013 Held for 12y 5m+	$4.0B
M Miura Global Management, LLC Hedge Fund•Long/Short	Francisco Alfaro Managing Partner	10.06% $6.8M	0.00% 70.0K shares	Q4 2022 Held for 2y 11m	$67.9M
SurgoCap Partners LP Hedge Fund•Long/Short	Mala Gopal Gaonkar CIO	9.49% $334.4M	0.23% 3.4M shares	Q1 2025 Held for 8 months	$3.5B
ORBIMED ADVISORS LLC Hedge Fund•Sector	Sam Block Iii CFO	5.75% $237.2M	0.16% 2.4M shares	Q3 2013 Held for 12y 2m	$4.1B
Egerton Capital LLP Hedge Fund•Long/Short	Jeffrey James Blumberg CEO	5.47% $518.7M	0.36% 5.3M shares	Q2 2025 Held for 5 months	$9.5B
F FACT Capital, LP Hedge Fund•Long/Short	Gretchen Jing Guo Managing Partner	4.87% $9.4M	0.01% 95.9K shares	Q4 2022 Held for 2y 11m	$192.3M
M Meridiem Capital Partners LP Hedge Fund•Long/Short	Mohammed Khalid Malik Founder	4.84% $70.3M	0.05% 720.1K shares	Q1 2025 Held for 8 months	$1.5B
Catalio Capital Management, LP Venture Capital	Olga Eduardovna Maltseva COO	4.75% $25.7M	0.02% 263.0K shares	Q4 2024 Held for 11 months	$540.9M
Rhenman & Partners Asset Management AB RIA/Wealth	Sean Allen Soulvie Managing Partner	4.73% $42.8M	0.03% 438.0K shares	Q3 2017 Held for 8y 2m	$903.7M
Parkman Healthcare Partners LLC Hedge Fund•Long/Short	Gregory Arthur Martinez CIO	4.66% $42.4M	0.03% 434.4K shares	Q3 2022 Held for 3y 2m	$910.1M

Hedge Fund Spotlight

Discover hedge funds investing in BSX

DRIEHAUS CAPITAL MANAGEMENT LLC

Hedge Fund • Event Driven

Portfolio ManagerStephen Thomas Weber

Portfolio Value: $13.9B
Positions: 419
Last Reported: Q3 2025

Sector Allocation

Position in Boston Scientific

Market Value: $597.7K
Shares Held: 6.1K
Portfolio Weight: 0.00%
Owned Since: 2025-Q3

Top Holding	Sector	Market Value	Weight
1 Taiwan Semiconductor Manufacturing Company TSM	Semiconductors Technology	$626.6M	4.49%
2 Crinetics Pharmaceuticals CRNX	Biotechnology Healthcare	$270.0M	1.94%
3 Planet Labs PL	Aerospace & Defense Industrials	$186.6M	1.34%