Boston Scientific BSX
$42.75 −$1.89 (-4.23%)
Market closed · Nov 6, 9:50 pm ET · Last extended-hours $42.80 +0.12%
Open$43.35
Prev close$44.64
Day range$42.69 – $43.63
Volume14.71M
Market cap$61.96B
P/E (TTM)18.0
Dividend yield–
Ownership & positioning
Who holds it, who is betting against it, and where the big money is moving
Institutional ownership93.3%-0.67 pts vs. prior quarter
Institutions holding1,883+30 vs. prior quarter
Insider trades (recent)38 buys / 11 sellsNet buying
Short interest2.81% of floatDays to cover 2.6 · as of 15 Oct 2026
Short-sale volume share9.9%5-day average of daily volume
Short-sale volume as % of daily volume
Large-order net flow, last 20 sessions
Net of large-order buying minus selling, in USD. Over this window: −$205.99M (6 inflow days, 14 outflow days).
Net flow by order size, last 20 sessions
Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.
The five largest holders on file together own 27.3% of shares outstanding.
Largest holders
By investor type
Reported short interest has risen from 1.50% to 2.81% of float over the last 6 biweekly reports (31 Jul 2026 to 15 Oct 2026).
Recent institutional activity
| Holder | Type | Period | Share change | New stake |
|---|---|---|---|---|
| Deka Investment GmbH | Mutual Fund | 2026/Q3 | +2,997,949 | 0.3% |
| Amundi Luxembourg S.A. | Mutual Fund | 2026/Q3 | +2,597,641 | 0.2% |
| Assenagon Asset Management S.A. | Mutual Fund | 2026/Q3 | +2,560,904 | 0.5% |
| Amundi Luxembourg S.A. | Mutual Fund | 2026/Q3 | +2,597,641 | 0.2% |
| PRIMECAP Management Company | Mutual Fund | 2026/Q3 | +17,991,140 | 3.5% |
| MFS Investment Management | Mutual Fund | 2026/Q3 | +13,862,619 | 1.7% |
| Two Sigma Investments, LP | Hedge Fund | 2026/Q3 | +9,947,792 | 1.3% |
| Arrowstreet Capital, Limited Partnership | Mutual Fund | 2026/Q3 | +9,402,245 | 1.6% |
| Fidelity International Ltd | Mutual Fund | 2026/Q3 | +9,117,938 | 0.9% |
| Capital Research | Mutual Fund | 2026/Q3 | +8,499,126 | 2.2% |
| Jane Street Group, LLC | Private Company | 2026/Q3 | +8,055,874 | 0.8% |
| AQR Capital Management | Hedge Fund | 2026/Q3 | +4,384,381 | 0.7% |
| RBC Rochdale, LLC | Mutual Fund | 2026/Q3 | +3,504,566 | 0.3% |
| Qube Research & Technologies Ltd | Mutual Fund | 2026/Q3 | +3,373,891 | 0.6% |
| Farallon Capital Management, L.L.C. | Hedge Fund | 2026/Q3 | +3,050,500 | 0.7% |
Institutional buy/sell activity by reporting period, largest moves first.
Insider transactions
| Date | Insider | Title | Transaction | Shares | Price | Held after |
|---|---|---|---|---|---|---|
| 1 Sep 2026 | Padraig O'Connor | Derivative Exercise and Sale | -567 | $48.37 | 7,892 | |
| 1 Sep 2026 | Padraig O'Connor | Derivative Exercise and Retained | +604 | – | 7,892 | |
| 24 Aug 2026 | Susan Morano | Independent Director | Open Market Acquisition | +2,040 | $49.22 | 13,784 |
| 10 Aug 2026 | Emily Woodworth | Senior VP, Global Controller & Chief Accounting Officer | Acquisition Under Employee Benef | +2,930 | $51.19 | 6,053 |
| 9 Aug 2026 | Jonathan Monson | Chief Financial Officer | Acquisition Under Employee Benef | +9,908 | $50.46 | 48,971 |
| 4 Aug 2026 | David Habiger | Independent Director | Open Market Acquisition | +2,100 | $47.59 | 17,160 |
| 3 Aug 2026 | David Habiger | Independent Director | Open Market Acquisition | +1,182 | $48.59 | 15,060 |
| 2 Aug 2026 | Michael Mahoney | Chairperson & CEO | Open Market Acquisition | +186,240 | $48.33 | 1,612,143 |
| 2 Aug 2026 | Michael Mahoney | Chairperson & CEO | Acquisition Under Employee Benef | +22,119 | $48.43 | 1,612,143 |
| 30 Jul 2026 | Edward Ludwig | Lead Independent Director | Open Market Acquisition | +5,000 | $45.48 | 30,359 |
| 30 Jul 2026 | Joseph Fitzgerald | Executive VP & Group President of Cardiovascular | Acquisition Under Employee Benef | +64,198 | $46.73 | 283,339 |
| 30 Jun 2026 | Jonathan Monson | Chief Financial Officer | Derivative Exercise and Sale | -1,010 | $43.06 | 39,063 |
| 30 Jun 2026 | Jonathan Monson | Chief Financial Officer | Derivative Exercise and Retained | +1,077 | – | 39,063 |
| 27 May 2026 | Michael Mahoney | Chairperson & CEO | Other Disposition | -386,755 | – | 1,403,784 |
| 19 May 2026 | Edward Ludwig | Lead Independent Director | Open Market Acquisition | +3,580 | $56.68 | 25,359 |
| 19 May 2026 | Cheryl Pegus | Independent Director | Open Market Acquisition | +1,770 | $56.49 | 1,770 |
| 19 May 2026 | David Habiger | Independent Director | Open Market Acquisition | +4,450 | $56.95 | 13,878 |
| 6 May 2026 | Edward Ludwig | Lead Independent Director | Other Acquisition | +3,800 | – | 21,779 |
| 6 May 2026 | Ellen Zane | Independent Director | Other Acquisition | +3,800 | – | 27,934 |
| 6 May 2026 | David Wichmann | Independent Director | Other Acquisition | +3,800 | – | 45,382 |
From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.
Short interest, by report
| Report date | Shares short | % of float | Days to cover |
|---|---|---|---|
| 15 Oct 2026 | 40,708,019 | 2.8% | 2.6 |
| 30 Sep 2026 | 41,410,512 | 2.9% | 1.9 |
| 15 Sep 2026 | 46,504,769 | 3.2% | 2.4 |
| 31 Aug 2026 | 48,173,758 | 3.3% | 2.3 |
| 14 Aug 2026 | 27,617,554 | 1.9% | 1.6 |
| 31 Jul 2026 | 22,276,201 | 1.5% | 1.0 |
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