As of September 29, 2026, the three largest insider holders of BSX are Michael F Mahoney (Chairman, President Ceo, 1.61Mn shares), Daniel J. Brennan (Evp And Cfo, 225.81K shares), Joseph Michael Fitzgerald (Evp Group Pres, Cardiology, 213.91K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Michael F Mahoney | Chairman, President Ceo | 1,590,024 | 22,119 | 1,612,143 | 58.2% | 05 Aug, 2026 |
| 2 | Daniel J. Brennan | Evp And Cfo | 225,808 | 0 | 225,808 | 8.1% | 19 Feb, 2025 |
| 3 | Maulik Nanavaty | Svp Pres, Neuromodulation | 177,258 | 0 | 177,258 | 6.4% | 02 Mar, 2022 |
| 4 | David J Roux | Director | 73,591 | 0 | 73,591 | 2.7% | 05 May, 2023 |
| 5 | Joseph Michael Fitzgerald | Evp Group Pres, Cardiology | 0 | 64,198 | 64,198 | 2.3% | 03 Aug, 2026 |
| 6 | Arthur C Butcher | Evp Grp Pres, Medsurg Apac | 56,887 | 0 | 56,887 | 2.1% | 04 May, 2026 |
| 7 | John E Sununu | Director | 54,723 | 0 | 54,723 | 2.0% | 09 May, 2025 |
| 8 | Vance R Brown | Evp, Gc And Corp. Secretary | 54,244 | 0 | 54,244 | 2.0% | 18 Feb, 2026 |
| 9 | Edward F Mackey | Evp, Operations | 52,944 | 0 | 52,944 | 1.9% | 02 Mar, 2022 |
| 10 | David S Wichmann | Director | 45,382 | 0 | 45,382 | 1.6% | 11 May, 2026 |
| 11 | Eric Francis Yves Thepaut | Evp Pres, Eur, Mid East, Afr | 31,422 | 0 | 31,422 | 1.1% | 13 May, 2024 |
| 12 | Edward J Ludwig | Director | 30,359 | 0 | 30,359 | 1.1% | 03 Aug, 2026 |
| 13 | Wendy Carruthers | Evp, Human Resources | 29,308 | 0 | 29,308 | 1.1% | 03 Dec, 2024 |
| 14 | Ian T Meredith | Evp Global Chief Med Officer | 28,082 | 0 | 28,082 | 1.0% | 29 Mar, 2022 |
| 15 | Ellen M Zane | Director | 27,934 | 0 | 27,934 | 1.0% | 11 May, 2026 |
| 16 | Jeffrey B. Mirviss | Evppres, Periph Intervent | 25,766 | 0 | 25,766 | 0.9% | 25 Feb, 2025 |
| 17 | Meghan Scanlon | Svp,Pres,Urology Pelvic Health | 24,461 | 0 | 24,461 | 0.9% | 02 May, 2022 |
| 18 | Jodi Euerle Eddy | Svp, Chief Info Digital Off. | 23,263 | 0 | 23,263 | 0.8% | 04 Apr, 2022 |
| 19 | John Bradley Sorenson | Evp, Global Operations | 18,705 | 0 | 18,705 | 0.7% | 05 May, 2025 |
| 20 | Miriam O'Sullivan | Svp, Chief Hr Officer | 17,302 | 0 | 17,302 | 0.6% | 18 Feb, 2026 |
| 21 | David C Habiger | Director | 17,160 | 0 | 17,160 | 0.6% | 07 Aug, 2026 |
| 22 | Scott Olson | Svp Pres, Crm, Diagnostics | 14,518 | 0 | 14,518 | 0.5% | 01 Apr, 2022 |
| 23 | Susan E Morano | Director | 13,784 | 0 | 13,784 | 0.5% | 26 Aug, 2026 |
| 24 | Jessica L Mega | Director | 12,035 | 0 | 12,035 | 0.4% | 11 May, 2026 |
| 25 | Jonathan Monson | Evp And Cfo | 0 | 9,908 | 9,908 | 0.4% | 11 Aug, 2026 |
| 26 | Nelda J Connors | Director | 8,823 | 0 | 8,823 | 0.3% | 05 May, 2023 |
| 27 | Padraig Andrew O'Connor | Evp, Global Operations | 7,892 | 0 | 7,892 | 0.3% | 03 Sep, 2026 |
| 28 | Christophe Pierre Weber | Director | 3,786 | 0 | 3,786 | 0.1% | 11 May, 2026 |
| 29 | Emily Woodworth | Svp, Global Controller And Cao | 0 | 2,930 | 2,930 | 0.1% | 12 Aug, 2026 |
| 30 | Charles J Dockendorff | Director | 2,901 | 0 | 2,901 | 0.1% | 10 May, 2024 |
| 31 | Yoshiaki Fujimori | Director | 2,081 | 0 | 2,081 | 0.1% | 30 Jul, 2025 |
| 32 | Cheryl Pegus | Director | 1,770 | 0 | 1,770 | 0.1% | 21 May, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 02 Sep, 2026 | Padraig Andrew O'Connor | Evp, Global Operations | Acquired M | 1,171 | $0.00 | $0 | 8,459 | Direct |
| 02 Sep, 2026 | Padraig Andrew O'Connor | Evp, Global Operations | Disposed F | 567 | $48.37 | $27.43K | 7,892 | Direct |
| 02 Sep, 2026 | Padraig Andrew O'Connor | Evp, Global Operations | Disposed M | 1,171 | $0.00 | $0 | 3,516 | Direct |
| 25 Aug, 2026 | Susan E Morano | Director | Acquired P | 2,040 | $49.22 | $100.41K | 13,784 | Direct |
| 11 Aug, 2026 | Emily Woodworth | Svp, Global Controller And Cao | Acquired I | 2,930 | $51.19 | $149.99K | 2,930 | Indirect |
| 10 Aug, 2026 | Jonathan Monson | Evp And Cfo | Acquired I | 9,908 | $50.46 | $499.96K | 9,908 | Indirect |
| 05 Aug, 2026 | David C Habiger | Director | Acquired P | 2,100 | $47.59 | $99.94K | 17,160 | Direct |
| 03 Aug, 2026 | Michael F Mahoney | Chairman, President Ceo | Acquired P | 186,240 | $48.33 | $9.00Mn | 1,590,024 | Direct |
| 03 Aug, 2026 | David C Habiger | Director | Acquired P | 1,042 | $48.07 | $50.08K | 14,920 | Direct |
| 03 Aug, 2026 | Michael F Mahoney | Chairman, President Ceo | Acquired I | 22,119 | $48.43 | $1.07Mn | 22,119 | Indirect |
| 04 Aug, 2026 | David C Habiger | Director | Acquired P | 140 | $48.59 | $6.80K | 15,060 | Direct |
| 31 Jul, 2026 | Edward J Ludwig | Director | Acquired P | 5,000 | $45.48 | $227.40K | 30,359 | Direct |
| 31 Jul, 2026 | Joseph Michael Fitzgerald | Evp Group Pres, Cardiology | Acquired I | 64,198 | $46.73 | $3.00Mn | 64,198 | Indirect |
| 01 Jul, 2026 | Jonathan Monson | Evp And Cfo | Acquired M | 2,087 | $0.00 | $0 | 40,073 | Direct |
| 01 Jul, 2026 | Jonathan Monson | Evp And Cfo | Disposed F | 1,010 | $43.06 | $43.49K | 39,063 | Direct |
| 01 Jul, 2026 | Jonathan Monson | Evp And Cfo | Disposed M | 2,087 | $0.00 | $0 | 6,263 | Direct |
| 28 May, 2026 | Michael F Mahoney | Chairman, President Ceo | Disposed G | 386,755 | $0.00 | $0 | 0 | Indirect |
| 20 May, 2026 | Edward J Ludwig | Director | Acquired P | 3,580 | $56.68 | $202.91K | 25,359 | Direct |
| 20 May, 2026 | Cheryl Pegus | Director | Acquired P | 1,770 | $56.49 | $99.99K | 1,770 | Direct |
| 19 May, 2026 | David C Habiger | Director | Acquired P | 2,200 | $56.95 | $125.28K | 11,628 | Direct |