Boston Scientific Corp
Ownership
Ownership Structure
Who owns Boston Scientific Corp (BSX)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.7% of the shares are freely tradable; institutional investors hold 94.9%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 9.10 | 131,822,037 | -3.1 | 03/31/2026 |
| Vanguard Capital Management, LLC | 6.65 | 96,411,568 | +0.0 | 03/31/2026 |
| FMR Inc | 5.12 | 74,226,395 | -23.8 | 03/31/2026 |
| State Street Corp | 4.69 | 67,986,847 | +3.3 | 03/31/2026 |
| PRIMECAP Management Company | 3.49 | 50,520,914 | +55.3 | 06/30/2026 |
| JPMorgan Chase & Co | 2.30 | 33,350,157 | +31.4 | 03/31/2026 |
| Geode Capital Management, LLC | 2.30 | 33,285,757 | +2.8 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 3.27 | 47,324,803 | +0.3 | 07/31/2026 |
| Vanguard 500 Index Investor | 2.69 | 39,020,916 | +1.1 | 07/31/2026 |
| Vanguard PRIMECAP Inv | 2.13 | 30,883,039 | +46.7 | 06/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Mahoney Michael F | Chairman, President & CEO | 1,612,143 | 70,289,435 $ | Aug 3, 2026 | both |
| Fitzgerald Joseph Michael | EVP & Group Pres, Cardiology | 64,198 | 2,799,033 $ | Jul 31, 2026 | indirect |
| Ludwig Edward J | Director | 30,359 | 1,323,652 $ | Jul 31, 2026 | direct |
| Habiger David C | Director | 17,160 | 748,176 $ | Aug 5, 2026 | direct |
| Morano Susan E | Director | 13,784 | 600,982 $ | Aug 25, 2026 | direct |
| Monson Jonathan | EVP and CFO | 9,908 | 431,989 $ | Aug 10, 2026 | indirect |
| O'Connor Padraig Andrew | EVP, Global Operations | 7,892 | 344,091 $ | Sep 2, 2026 | direct |
| Woodworth Emily | SVP, Global Controller and CAO | 2,930 | 127,748 $ | Aug 11, 2026 | indirect |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 2, 2026 | O'Connor Padraig Andrew | EVP, Global Operations | Other | 567 | 48.37 | 27,426 |
| Sep 2, 2026 | O'Connor Padraig Andrew | EVP, Global Operations | Other | 1,171 | 0.00 | – |
| Aug 25, 2026 | Morano Susan E | Director | Buy | 2,040 | 49.22 | 100,408 |
| Aug 11, 2026 | Woodworth Emily | SVP, Global Controller and CAO | Other | 2,930 | 51.19 | 149,987 |
| Aug 10, 2026 | Monson Jonathan | EVP and CFO | Other | 9,908 | 50.46 | 499,958 |
| Aug 5, 2026 | Habiger David C | Director | Buy | 2,100 | 47.59 | 99,937 |
| Aug 4, 2026 | Habiger David C | Director | Buy | 140 | 48.59 | 6,802 |
| Aug 3, 2026 | Habiger David C | Director | Buy | 1,042 | 48.07 | 50,084 |
| Aug 3, 2026 | Mahoney Michael F | Chairman, President & CEO | Other | 22,119 | 48.43 | 1,071,223 |
| Aug 3, 2026 | Mahoney Michael F | Chairman, President & CEO | Buy | 186,240 | 48.33 | 9,001,408 |
| Jul 31, 2026 | Ludwig Edward J | Director | Buy | 5,000 | 45.48 | 227,400 |
| Jul 31, 2026 | Fitzgerald Joseph Michael | EVP & Group Pres, Cardiology | Other | 64,198 | 46.73 | 2,999,973 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.