As of March 23, 2026, the three largest insider holders of BIIB are Michel Vounatsos (Chief Executive Officer, 67.26K shares), Susan H Alexander (Evp Chief Legal Officer, 41.81K shares), Caroline Dorsa (Director, 31.00K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Michel Vounatsos | Chief Executive Officer | 67,261 | 0 | 23 Feb, 2022 |
| Susan H Alexander | Evp Chief Legal Officer | 41,807 | 0 | 10 Feb, 2026 |
| Caroline Dorsa | 31,002 | 0 | 18 Jun, 2025 | |
| Christopher Viehbacher | President And Ceo | 29,924 | 0 | 10 Feb, 2026 |
| Michael R Mcdonnell | Evp, Chief Financial Officer | 24,341 | 0 | 12 Feb, 2025 |
| Eric K Rowinsky | 24,339 | 0 | 18 Jun, 2025 | |
| Ginger Gregory | Evp, Human Resources | 22,359 | 0 | 10 Feb, 2026 |
| Susan H Alexander | Evp Chief Legal Officer | 0 | 20,082 | 07 Nov, 2024 |
| Nicole Murphy | Head Of Pharm Ops And Tech | 19,611 | 0 | 17 Feb, 2026 |
| Alexander J Denner | 15,099 | 0 | 17 Jun, 2022 | |
| Richard Mulligan | 15,099 | 0 | 17 Jun, 2022 | |
| Nancy Leaming | 13,763 | 0 | 02 Jul, 2021 | |
| Stephen A Sherwin | 13,688 | 0 | 18 Jun, 2025 | |
| Robin Kramer | Chief Financial Officer | 11,472 | 0 | 10 Feb, 2026 |
| Rachid Izzar | Head Of Global Product Strat. | 11,011 | 0 | 10 Feb, 2026 |
| Alfred Sandrock | Head Of Research Development | 10,169 | 0 | 09 Jun, 2021 |
| Stelios Papadopoulos | 10,095 | 0 | 17 Jun, 2022 | |
| Jesus B Mantas | 9,758 | 0 | 18 Jun, 2025 | |
| William A Hawkins | 8,860 | 0 | 18 Jun, 2025 | |
| Brian S Posner | 8,175 | 0 | 02 Jul, 2021 | |
| Priya Singhal | Head Of Development | 8,043 | 0 | 10 Feb, 2026 |
| Chirfi Guindo | Head Of Glob Prod Strat Com | 7,364 | 0 | 23 Feb, 2022 |
| Maria C Freire | 6,815 | 0 | 18 Jun, 2025 | |
| Adam Keeney | Head Of Corporate Development | 5,881 | 0 | 10 Feb, 2026 |
| Susan Langer | 5,129 | 0 | 18 Jun, 2025 | |
| Alphonse Galdes | Evp Pharmaceutical Oper Tech | 5,064 | 0 | 21 Jan, 2022 |
| Jane Grogan | Head Of Research | 4,058 | 0 | 10 Feb, 2026 |
| Monish D Patolawala | 3,710 | 0 | 18 Jun, 2025 | |
| Lloyd Minor | 2,370 | 0 | 18 Jun, 2025 | |
| William D /Ca/ Jones | 2,145 | 0 | 17 Jun, 2022 | |
| Sean Godbout | Chief Accounting Officer | 1,215 | 0 | 10 Feb, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 13 Feb, 2026 | Robin Kramer | Restricted Stock Unit | A | 8,450 | $0.00 | 8,450 | D | A |
| 13 Feb, 2026 | Adam Keeney | Restricted Stock Unit | A | 8,025 | $0.00 | 8,025 | D | A |
| 13 Feb, 2026 | Priya Singhal | Restricted Stock Unit | A | 10,560 | $0.00 | 10,560 | D | A |
| 13 Feb, 2026 | Jane Grogan | Restricted Stock Unit | A | 8,450 | $0.00 | 8,450 | D | A |
| 12 Feb, 2026 | Nicole Murphy | Common Stock | A | 3 | $195.04 | 19,611 | D | P |
| 13 Feb, 2026 | Ginger Gregory | Restricted Stock Unit | A | 8,025 | $0.00 | 8,025 | D | A |
| 13 Feb, 2026 | Susan H Alexander | Restricted Stock Unit | A | 8,450 | $0.00 | 8,450 | D | A |
| 13 Feb, 2026 | Sean Godbout | Restricted Stock Unit | A | 1,800 | $0.00 | 1,800 | D | A |
| 13 Feb, 2026 | Rachid Izzar | Restricted Stock Unit | A | 7,390 | $0.00 | 7,390 | D | A |
| 13 Feb, 2026 | Christopher Viehbacher | Restricted Stock Unit | A | 38,015 | $0.00 | 38,015 | D | A |
| 13 Feb, 2026 | Nicole Murphy | Restricted Stock Unit | A | 10,560 | $0.00 | 10,560 | D | A |
| 06 Feb, 2026 | Robin Kramer | Common Stock | A | 789 | $0.00 | 8,801 | D | M |
| 06 Feb, 2026 | Jane Grogan | Common Stock | A | 1,385 | $0.00 | 3,176 | D | M |
| 06 Feb, 2026 | Nicole Murphy | Common Stock | A | 2,102 | $0.00 | 16,324 | D | M |
| 06 Feb, 2026 | Adam Keeney | Common Stock | A | 1,802 | $0.00 | 4,186 | D | M |
| 06 Feb, 2026 | Christopher Viehbacher | Common Stock | A | 9,008 | $0.00 | 25,451 | D | M |
| 06 Feb, 2026 | Ginger Gregory | Common Stock | A | 1,635 | $0.00 | 19,400 | D | M |
| 06 Feb, 2026 | Rachid Izzar | Common Stock | A | 2,044 | $0.00 | 8,204 | D | M |
| 06 Feb, 2026 | Sean Godbout | Common Stock | A | 257 | $0.00 | 752 | D | M |
| 06 Feb, 2026 | Priya Singhal | Common Stock | A | 2,217 | $0.00 | 8,488 | D | M |