Boston Scientific
BSX · NYSE
Who owns BSX
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 31.3% of BSX’s shares.
- Vanguard Capital Management, LLC6.5%
- BlackRock Institutional Trust Company, N.A.5.1%
- State Street Investment Management (US)4.7%
- PRIMECAP Management Company3.4%
- Next 6 largest institutions11.6%
- All other shareholders68.7%
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Capital Management, LLC | 97.09M | 6.53% |
| BlackRock Institutional Trust Company, N.A. | 75.77M | 5.10% |
| State Street Investment Management (US) | 70.11M | 4.72% |
| PRIMECAP Management Company | 50.52M | 3.40% |
| Fidelity Management & Research Company LLC | 37.53M | 2.53% |
| Geode Capital Management, L.L.C. | 33.44M | 2.25% |
| Vanguard Portfolio Management, LLC | 29.79M | 2.00% |
| D. E. Shaw & Co., L.P. | 25.46M | 1.71% |
| Arrowstreet Capital, Limited Partnership | 23.29M | 1.57% |
| MFS Investment Management | 22.74M | 1.53% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Total Stock Market Index Fund | 47.32M | 3.18% |
| Vanguard 500 Index Fund | 39.02M | 2.63% |
| Vanguard PRIMECAP Fund | 30.88M | 2.08% |
| iShares Core S&P 500 ETF | 19.82M | 1.33% |
| Statens Pensjonsfond Utland | 19.65M | 1.32% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders bought $10.04M (10 trades) of BSX on the open market, with no sales.
| Insider | Type | Shares | Value |
|---|---|---|---|
| O'Connor Padraig Andrew | Option exercise | 1.17K | — |
| O'Connor Padraig Andrew | Tax withholding | 567 | $27.43K |
| O'Connor Padraig Andrew | Option exercise | 1.17K | — |
| Morano Susan E | Buy | 2.04K | $100.41K |
| Woodworth Emily | Other | 2.93K | $149.99K |
| Monson Jonathan | Other | 9.91K | $499.96K |
| Habiger David C | Buy | 2.10K | $99.94K |
| Habiger David C | Buy | 140 | $6.80K |
| Mahoney Michael F | Other | 22.12K | $1.07M |
| Mahoney Michael F | Buy | 186.24K | $9.00M |
Congressional trades
Disclosed by members of Congress over the last 12 months
| Member | Type | Amount | Traded |
|---|---|---|---|
| Gilbert CisnerosHouse | Purchase | $1K–$15K | Aug 18, 2026 |
| John BoozmanSenator | Sale (Partial) | $1K–$15K | Jun 4, 2026 |
| Ro KhannaHouse | Purchase | $15K–$50K | Mar 30, 2026 |
| Alan ArmstrongSenator | Purchase | $1K–$15K | Mar 27, 2026 |
| Michael McCaulHouse | Purchase | $1K–$15K | Mar 27, 2026 |
| Gil CisnerosHouse | Purchase | $1K–$15K | Feb 10, 2026 |
| Gil CisnerosHouse | Purchase | $1K–$15K | Jan 30, 2026 |
| Markwayne MullinSenator | Purchase | $15K–$50K | Dec 29, 2025 |
| Gil CisnerosHouse | Sale | $1K–$15K | Dec 24, 2025 |
| Gil CisnerosHouse | Purchase | $1K–$15K | Nov 18, 2025 |
| Lisa McClainHouse | Sale | $1K–$15K | Oct 31, 2025 |
| Lisa McClainHouse | Sale | $1K–$15K | Oct 30, 2025 |
| Kevin HernHouse | Sale | $15K–$50K | Oct 28, 2025 |
Short interest
Settled Sep 30, 2026
- Shares short
- 41.41M
- Days to cover
- 1.88
- % of shares outstanding
- 2.79%
- Average daily volume
- 21.98M
- Change since last report
- −11.0%
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