BSX Boston Scientific Corporation
Boston Scientific Corporation (BSX) Institutional Ownership
What the institutions did with BSX last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| BlackRock, Inc. | 129.7M | 9.7% |
| VANGUARD CAPITAL MANAGEMENT LLC | 97.1M | 7.3% |
| STATE STREET CORP | 70.1M | 5.3% |
| PRIMECAP MANAGEMENT CO/CA/ | 50.5M | 3.8% |
| FMR LLC | 45.7M | 3.4% |
| GEODE CAPITAL MANAGEMENT, LLC | 33.4M | 2.5% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 29.8M | 2.2% |
| D. E. Shaw & Co., Inc. | 25.5M | 1.9% |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 24.9M | 1.9% |
| JPMORGAN CHASE & CO | 23.9M | 1.8% |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 23.3M | 1.7% |
| NORGES BANK | 21.2M | 1.6% |
| TWO SIGMA INVESTMENTS, LP | 19.4M | 1.5% |
| MORGAN STANLEY | 18.9M | 1.4% |
| Jupiter Topco LLC | 18.8M | 1.4% |
| Bollard Group LLC | 18.4M | 1.4% |
| GOLDMAN SACHS GROUP INC | 17.0M | 1.3% |
| Capital World Investors | 16.8M | 1.3% |
| UBS Group AG | 16.4M | 1.2% |
| WELLINGTON MANAGEMENT GROUP LLP | 15.3M | 1.1% |
| Amundi | 14.3M | 1.1% |
| Capital Research Global Investors | 14.2M | 1.1% |
| Invesco Ltd. | 13.8M | 1.0% |
| FRANKLIN RESOURCES INC | 13.8M | 1.0% |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 13.1M | 1.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| FMR LLC | Reduced | 74.2M | 45.7M | -28.5M |
| PRIMECAP MANAGEMENT CO/CA/ | Increased | 32.5M | 50.5M | +18.0M |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | Increased | 11.0M | 24.9M | +13.9M |
| TWO SIGMA INVESTMENTS, LP | Increased | 9.4M | 19.4M | +9.9M |
| BANK OF AMERICA CORP /DE/ | Reduced | 22.8M | 13.0M | -9.7M |
| JPMORGAN CHASE & CO | Reduced | 33.4M | 23.9M | -9.4M |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Increased | 13.9M | 23.3M | +9.4M |
| FIL Ltd | Increased | 3.2M | 12.3M | +9.1M |
| JANE STREET GROUP, LLC | Increased | 4.0M | 12.1M | +8.1M |
| EDGEWOOD MANAGEMENT LLC | Sold Out | 7.6M | 0 | -7.6M |
| Capital Research Global Investors | Increased | 7.1M | 14.2M | +7.1M |
| PARNASSUS INVESTMENTS, LLC | Reduced | 8.0M | 1.2M | -6.8M |
| NEUBERGER BERMAN GROUP LLC | Reduced | 7.1M | 2.1M | -4.9M |
| Invesco Ltd. | Increased | 9.1M | 13.8M | +4.7M |
| AQR CAPITAL MANAGEMENT LLC | Increased | 5.2M | 9.7M | +4.4M |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | Reduced | 13.2M | 9.2M | -4.0M |
| Rathbones Group PLC | Reduced | 6.4M | 2.5M | -3.8M |
| Ninety One UK Ltd | Reduced | 7.3M | 3.5M | -3.8M |
| WELLINGTON MANAGEMENT GROUP LLP | Reduced | 18.8M | 15.3M | -3.5M |
| Qube Research & Technologies Ltd | Increased | 5.6M | 8.9M | +3.4M |
| Point72 Asset Management, L.P. | Reduced | 3.7M | 365.2K | -3.3M |
| MORGAN STANLEY | Reduced | 22.3M | 18.9M | -3.3M |
| FIRST MANHATTAN CO. LLC. | Reduced | 4.9M | 1.7M | -3.2M |
| Vontobel Holding Ltd. | Reduced | 8.0M | 4.9M | -3.1M |
| FARALLON CAPITAL MANAGEMENT LLC | Increased | 7.5M | 10.5M | +3.1M |
| Nuveen, LLC | Reduced | 11.7M | 8.7M | -3.0M |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Reduced | 4.6M | 1.7M | -3.0M |
| SG Americas Securities, LLC | Increased | 931.2K | 3.8M | +2.9M |
| Clearbridge Investments, LLC | Increased | 2.3M | 5.1M | +2.9M |
| Pictet Asset Management Holding SA | Reduced | 5.1M | 2.4M | -2.7M |
| 1832 Asset Management L.P. | Reduced | 7.3M | 4.6M | -2.7M |
| Holocene Advisors, LP | Reduced | 3.4M | 806.7K | -2.6M |
| SCHRODER INVESTMENT MANAGEMENT GROUP | Reduced | 7.3M | 4.7M | -2.5M |
| BNP PARIBAS FINANCIAL MARKETS | Increased | 5.1M | 7.6M | +2.5M |
| AMERICAN CENTURY COMPANIES INC | Reduced | 2.6M | 305.4K | -2.3M |
| WORLDQUANT MILLENNIUM ADVISORS LLC | Reduced | 2.3M | 5.8K | -2.3M |
| Ilex Capital Partners (UK) LLP | Sold Out | 2.2M | 0 | -2.2M |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC | Increased | 1.1M | 3.3M | +2.2M |
| BlackRock, Inc. | Reduced | 131.8M | 129.7M | -2.1M |
| STATE STREET CORP | Increased | 68.0M | 70.1M | +2.1M |
| GOLDMAN SACHS GROUP INC | Reduced | 18.9M | 17.0M | -1.9M |
| ROYAL BANK OF CANADA | Increased | 6.3M | 8.1M | +1.8M |
| MAVERICK CAPITAL LTD | Increased | 4.2M | 5.9M | +1.7M |
| Assenagon Asset Management S.A. | Reduced | 10.1M | 8.3M | -1.7M |
| Alphinity Investment Management Pty Ltd | Sold Out | 1.7M | 0 | -1.7M |
| Caisse de depot et placement du Quebec | Increased | 1.5M | 3.1M | +1.6M |
| CONGRESS ASSET MANAGEMENT CO | Reduced | 1.6M | 10.2K | -1.6M |
| Bank of New York Mellon Corp | Reduced | 9.5M | 7.9M | -1.6M |
| GREAT LAKES ADVISORS, LLC | Reduced | 1.9M | 279.8K | -1.6M |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | Reduced | 7.0M | 5.4M | -1.6M |
| UBS Group AG | Increased | 14.8M | 16.4M | +1.5M |
| Mariner, LLC | Reduced | 2.5M | 960.8K | -1.5M |
| Capital World Investors | Increased | 15.3M | 16.8M | +1.5M |
| FRED ALGER MANAGEMENT, LLC | Sold Out | 1.5M | 0 | -1.5M |
| Ensign Peak Advisors, Inc | Increased | 4.5M | 5.9M | +1.4M |
| Allianz Asset Management GmbH | Reduced | 2.4M | 1.0M | -1.4M |
| DEERFIELD MANAGEMENT COMPANY, L.P. | New | 0 | 1.3M | +1.3M |
| Balyasny Asset Management L.P. | Reduced | 1.4M | 71.3K | -1.3M |
| NORDEA INVESTMENT MANAGEMENT AB | Increased | 1.3M | 2.6M | +1.3M |
| CIBC Bancorp USA Inc. | Reduced | 1.9M | 706.3K | -1.2M |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.