Boston Scientific Corporation (BSX) Ownership
BSX ownership summary
as of October 18, 2026- Institutions
- 94.8% of shares outstanding
- Insiders
- 0.25% of shares outstanding
- Shares outstanding
- 1.45B
- Float
- 1.44B shares available to trade
- Short interest
- 2.86% 41.4M shares short
- Days to cover
- 1.99 short interest down 14.0% vs prior month
- Institutions 94.78%
- Insiders 0.25%
- Other investors 4.96%
BSX top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 8.95% | 129.7M | $5.76B | −2.1M (−1.6%) | June 30, 2026 |
| 2 | Vanguard Capital Management, LLC | 6.70% | 97.1M | $4.31B | +675,985 (+0.7%) | June 30, 2026 |
| 3 | State Street Corp | 4.84% | 70.1M | $3.11B | +2.1M (+3.1%) | June 30, 2026 |
| 4 | PRIMECAP Management Company | 3.49% | 50.5M | $2.24B | +18.0M (+55.3%) | June 30, 2026 |
| 5 | FMR Inc | 3.15% | 45.7M | $2.03B | −28.5M (−38.4%) | June 30, 2026 |
| 6 | Geode Capital Management, LLC | 2.31% | 33.4M | $1.48B | +154,345 (+0.5%) | June 30, 2026 |
| 7 | Vanguard Portfolio Management, LLC | 2.06% | 29.8M | $1.32B | −3,417 (−0.0%) | June 30, 2026 |
| 8 | D. E. Shaw & Co LP | 1.76% | 25.5M | $1.13B | +1.1M (+4.7%) | June 30, 2026 |
| 9 | Massachusetts Financial Services Company | 1.72% | 24.9M | $1.10B | +13.9M (+126.1%) | June 30, 2026 |
| 10 | JPMorgan Chase & Co | 1.65% | 23.9M | $1.06B | −9.4M (−28.3%) | June 30, 2026 |
| 11 | Arrowstreet Capital Limited Partnership | 1.61% | 23.3M | $1.03B | +9.4M (+67.7%) | June 30, 2026 |
| 12 | NORGES BANK | 1.46% | 21.2M | $939.7M | −1.9M (−8.2%) | June 30, 2026 |
| 13 | Two Sigma Investments LLC | 1.34% | 19.4M | $859.3M | +9.9M (+105.7%) | June 30, 2026 |
| 14 | Morgan Stanley - Brokerage Accounts | 1.31% | 18.9M | $841.1M | −3.3M (−14.9%) | June 30, 2026 |
| 15 | Jupiter Topco LLC | 1.30% | 18.8M | $835.5M | +18.8M (0.0%) | June 30, 2026 |
| 16 | Bollard Group LLC | 1.27% | 18.4M | $817.7M | −111,453 (−0.6%) | June 30, 2026 |
| 17 | The Goldman Sachs Group Inc | 1.17% | 17.0M | $752.6M | −1.9M (−10.3%) | June 30, 2026 |
| 18 | Capital World Investors | 1.16% | 16.8M | $746.3M | +1.5M (+9.8%) | June 30, 2026 |
| 19 | HHG PLC | 1.14% | 16.5M | $732.3M | +3.9M (+31.0%) | March 31, 2026 |
| 20 | UBS Group AG | 1.13% | 16.4M | $725.9M | +1.5M (+10.3%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 12 holders added 81.1M shares and 8 cut 47.4M.
BSX top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 3.26% | 47.2M | $2.10B | −87,832 (−0.2%) | August 31, 2026 |
| 2 | Vanguard 500 Index Investor | 2.72% | 39.5M | $1.75B | +468,468 (+1.2%) | August 31, 2026 |
| 3 | Vanguard PRIMECAP Inv | 2.13% | 30.9M | $1.37B | +9.8M (+46.7%) | June 30, 2026 |
| 4 | iShares Core S&P 500 ETF | 1.33% | 19.3M | $857.2M | −31,080 (−0.2%) | September 30, 2026 |
| 5 | Fidelity 500 Index | 1.33% | 19.3M | $856.5M | +74,111 (+0.4%) | August 31, 2026 |
| 6 | State Street® SPDR® S&P 500® ETF | 1.22% | 17.7M | $787.8M | — | September 30, 2026 |
| 7 | Vanguard Health Care Inv | 0.78% | 11.3M | $500.3M | −3.2M (−22.1%) | June 30, 2026 |
| 8 | American Funds Growth Fd of Amer A | 0.78% | 11.3M | $499.4M | +3.4M (+43.0%) | June 30, 2026 |
| 9 | State Street®HlthCrSelSectSPDR®ETF | 0.71% | 10.3M | $456.2M | +31,968 (+0.3%) | September 30, 2026 |
| 10 | MFS Value A | 0.66% | 9.6M | $426.2M | +4.3M (+81.9%) | August 31, 2026 |
| 11 | Vanguard MStar Growth Index Investor | 0.63% | 9.1M | $405.2M | −14,922 (−0.2%) | August 31, 2026 |
| 12 | Strategic Advisers Fidelity US TtlStk | 0.62% | 9.0M | $398.4M | −634,986 (−6.6%) | August 31, 2026 |
| 13 | Vanguard Capital Opportunity Inv | 0.61% | 8.8M | $392.6M | +3.3M (+58.7%) | June 30, 2026 |
| 14 | Vanguard Institutional Index I | 0.55% | 7.9M | $352.7M | −80,664 (−1.0%) | August 31, 2026 |
| 15 | Janus Henderson Enterprise D | 0.49% | 7.1M | $316.9M | +479,478 (+7.2%) | August 31, 2026 |
| 16 | Vanguard MStar Value Index Investor | 0.49% | 7.1M | $315.2M | +24,497 (+0.3%) | August 31, 2026 |
| 17 | Putnam Large Cap Value A | 0.42% | 6.1M | $270.1M | — | August 31, 2026 |
| 18 | Fidelity Canadian Large Cap Sr B | 0.37% | 5.4M | $239.7M | +5.4M (0.0%) | June 30, 2026 |
| 19 | Vanguard PRIMECAP Core Inv | 0.34% | 5.0M | $220.0M | +2.1M (+72.5%) | June 30, 2026 |
| 20 | Vanguard Health Care ETF | 0.31% | 4.5M | $201.4M | +20,132 (+0.4%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
BSX insider transactions
latest 20| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-30 | Ro Khanna | Buy | $62.90 | — | — |
| 2026-03-23 | Ro Khanna | Sell | $69.54 | — | — |
| 2026-02-24 | Ro Khanna | Sell | $75.27 | — | — |
| 2026-02-17 | Ro Khanna | Buy | $76.25 | — | — |
| 2026-02-10 | Gilbert Ray Cisneros, Jr. | Buy | $74.26 | — | — |
| 2026-02-06 | Ro Khanna | Sell | $76.24 | — | — |
| 2026-02-05 | Ro Khanna | Sell | $77.60 | — | — |
| 2026-02-02 | Michael F Mahoney | Sell | $93.49 | 160,901 | $15.0M |
| 2026-01-30 | Gilbert Ray Cisneros, Jr. | Buy | $93.58 | — | — |
| 2026-01-29 | Ro Khanna | Buy | $92.26 | — | — |
| 2026-01-06 | Ro Khanna | Sell | $97.70 | — | — |
| 2025-12-29 | Markwayne Mullin | Buy | $95.74 | — | — |
| 2025-12-24 | Gilbert Ray Cisneros, Jr. | Sell | $96.00 | — | — |
| 2025-12-17 | John Boozman | Sell | $94.53 | — | — |
| 2025-12-01 | Arthur C Butcher | Sell | $101.55 | 17,313 | $1.8M |
| 2025-11-18 | Gilbert Ray Cisneros, Jr. | Buy | $99.23 | — | — |
| 2025-11-06 | Ellen M Zane | Sell | $98.28 | 12,891 | $1.3M |
| 2025-11-03 | Joseph Michael Fitzgerald | Sell | $99.47 | 50,000 | $5.0M |
| 2025-10-31 | Lisa C. McClain | Sell | $100.81 | — | — |
| 2025-10-30 | Lisa C. McClain | Sell | $100.55 | — | — |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
BSX shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns BSX
Institutional investors own 94.8% of Boston Scientific's shares and insiders 0.25%. The largest holder is BlackRock Inc with 8.95% of the shares (129.7M), as of June 30, 2026. Among the top 20 institutions, 12 added shares and 8 reduced their stake in the latest filings. Short interest is 2.86% of the float, or 1.99 days of average trading volume. The share count rose 10.8% since 2014.
Related: BSX analyst forecast, BSX key metrics. See the BSX stock overview for the latest quote and news.
BSX ownership FAQ
Who owns the most Boston Scientific stock?
The largest shareholders of Boston Scientific are BlackRock Inc (8.95%), Vanguard Capital Management, LLC (6.70%), State Street Corp (4.84%), PRIMECAP Management Company (3.49%), FMR Inc (3.15%).
What percentage of Boston Scientific is owned by institutions?
Institutions hold 94.8% of Boston Scientific's shares outstanding; insiders hold 0.25%.
Which funds own Boston Scientific?
The largest fund holders of Boston Scientific are Vanguard MStar Total Stk Mkt Idx Invest (3.26%), Vanguard 500 Index Investor (2.72%), Vanguard PRIMECAP Inv (2.13%), iShares Core S&P 500 ETF (1.33%), Fidelity 500 Index (1.33%).
What is Boston Scientific's short interest?
41.4M shares of Boston Scientific were sold short, 2.86% of the float; at the average daily volume it would take 1.99 days to cover.
Are insiders buying or selling Boston Scientific?
Of the latest 20 reported insider transactions in Boston Scientific (since October 30, 2025), 7 were purchases and 13 were sales.
How many shares of Boston Scientific are outstanding?
Boston Scientific has 1.45B shares outstanding, of which 1.44B are in the public float.