If you invested $1000 in Biogen Inc. (0R1B.L) since IPO date, it would be worth $697.43 as of October 22, 2026, based on a reinvested dividends scenario. Over the same period, a $1000 investment made 5 years ago would be worth $898.05, while $1000 invested 1 year ago would be worth $1,611.42. This corresponds to total returns of -30.26%, -10.19%, 61.14%, respectively, with annualized returns of -6.68%, -2.13%, 61.14%.
Custom investment amounts or purchase dates can also be explored using the Stoculator calculator. Past performance does not guarantee future results.
Date Range:
| Date | Open | Close | Adj Close | High | Low | Volume |
|---|---|---|---|---|---|---|
| October 21, 2026 | 246.64 | 241.38 | 241.38 | 247.04 | 238.01 | 194 |
| October 20, 2026 | 236.12 | 243.06 | 243.06 | 244.64 | 229.82 | 503 |
| October 19, 2026 | 230.85 | 233.21 | 233.21 | 236.35 | 228.02 | 252 |
| October 16, 2026 | 235.99 | 234.71 | 234.71 | 239.41 | 231.8 | 1,129 |
| October 15, 2026 | 235.18 | 237.95 | 237.95 | 240.94 | 234.55 | 2,948 |
| October 14, 2026 | 231.97 | 231.6 | 231.6 | 233.79 | 225.15 | 969 |
| October 13, 2026 | 235.43 | 227.22 | 227.22 | 235.43 | 226.75 | 523 |
| October 12, 2026 | 228.23 | 234 | 234 | 236.43 | 225.71 | 1,020 |
| October 09, 2026 | 221.96 | 226.05 | 226.05 | 227.38 | 217.81 | 376 |
| October 08, 2026 | 218.48 | 219.82 | 219.82 | 225.62 | 216.45 | 1,441 |
| October 07, 2026 | 225 | 225.2 | 225.2 | 227.94 | 220.13 | 523 |
| October 06, 2026 | 220.51 | 221.16 | 221.16 | 226.09 | 218 | 517 |
| October 05, 2026 | 221.81 | 220.72 | 220.72 | 221.81 | 216.12 | 1,017 |
| October 02, 2026 | 225.69 | 220.13 | 220.13 | 225.87 | 219.66 | 884 |
| October 01, 2026 | 228.99 | 225.58 | 225.58 | 228.99 | 224.23 | 394 |
| September 30, 2026 | 225.26 | 228.12 | 228.12 | 228.97 | 221.76 | 557 |
| September 29, 2026 | 224.61 | 226.25 | 226.25 | 230 | 224.61 | 531 |
| September 28, 2026 | 225.97 | 228.41 | 228.41 | 230.2 | 225.97 | 1,153 |
| September 25, 2026 | 229.8 | 226.68 | 226.68 | 229.8 | 221.51 | 398 |
| September 24, 2026 | 228.87 | 226.56 | 226.56 | 228.87 | 225 | 761 |
| September 23, 2026 | 227.02 | 223.74 | 223.74 | 229.99 | 222.42 | 253 |
| September 22, 2026 | 219.07 | 225.48 | 225.48 | 226.5 | 214.78 | 310 |
| September 21, 2026 | 208 | 220.93 | 220.93 | 221.64 | 208 | 525 |
| September 18, 2026 | 220.83 | 217.69 | 217.69 | 220.83 | 216.96 | 842 |
| September 17, 2026 | 214.49 | 217.55 | 217.55 | 218.52 | 214.49 | 74 |
| September 16, 2026 | 216.17 | 217 | 217 | 218.37 | 210.58 | 174 |
| September 15, 2026 | 217.33 | 216.12 | 216.12 | 222.34 | 213.92 | 398 |
| September 11, 2026 | 213.15 | 218.96 | 218.96 | 218.97 | 213.15 | 280 |
| September 10, 2026 | 207.46 | 215.08 | 215.08 | 216.23 | 207.46 | 515 |
| September 09, 2026 | 211.3 | 211.89 | 211.89 | 215.57 | 209 | 3,538 |
| September 08, 2026 | 227 | 213.67 | 213.67 | 227 | 210.51 | 1,814 |
| September 04, 2026 | 219.7 | 220.56 | 220.56 | 223 | 219.7 | 162 |
| September 03, 2026 | 221.5 | 224.26 | 224.26 | 226.94 | 218.66 | 249 |
| September 02, 2026 | 216 | 224.01 | 224.01 | 224.54 | 209.55 | 441 |
| September 01, 2026 | 218.73 | 214.74 | 214.74 | 218.73 | 213.44 | 337 |
| August 28, 2026 | 215.13 | 217.27 | 217.27 | 224.58 | 215.13 | 633 |
| August 27, 2026 | 221.89 | 221.2 | 221.2 | 224.79 | 217.87 | 311 |
| August 26, 2026 | 216.41 | 221.51 | 221.51 | 221.72 | 216.41 | 125 |
| August 25, 2026 | 217 | 222.18 | 222.18 | 222.39 | 215 | 216 |
| August 24, 2026 | 223.4 | 216.25 | 216.25 | 223.4 | 214 | 1,441 |
| August 21, 2026 | 210.73 | 217.49 | 217.49 | 219.12 | 210.73 | 368 |
| August 20, 2026 | 224.3 | 216.64 | 216.64 | 224.3 | 216.64 | 946 |
| August 19, 2026 | 212.55 | 218.99 | 218.99 | 220.42 | 211 | 1,728 |
| August 18, 2026 | 205.48 | 213.35 | 213.35 | 213.53 | 205.48 | 134 |
| August 17, 2026 | 215.04 | 209.32 | 209.32 | 215.04 | 207.67 | 419 |
| August 14, 2026 | 204.96 | 209.91 | 209.91 | 212.25 | 204.96 | 266 |
| August 13, 2026 | 212 | 210.65 | 210.65 | 213.15 | 209.19 | 207 |
| August 12, 2026 | 206.9 | 206.5 | 206.5 | 207.09 | 201 | 142 |
| August 11, 2026 | 205.91 | 204.85 | 204.85 | 210.61 | 201.43 | 670 |
| August 10, 2026 | 210.39 | 206.91 | 206.91 | 217.75 | 202.62 | 680 |
| August 07, 2026 | 207 | 206.34 | 206.34 | 209 | 204.82 | 177 |
| August 06, 2026 | 209.95 | 204.59 | 204.59 | 211 | 202.67 | 408 |
| August 05, 2026 | 208.45 | 208.17 | 208.17 | 219.48 | 207 | 337 |
| August 04, 2026 | 201.81 | 207.3 | 207.3 | 207.85 | 196.96 | 405 |
| August 03, 2026 | 201.45 | 200.18 | 200.18 | 206.27 | 196.65 | 769 |
| July 31, 2026 | 210 | 205.5 | 205.5 | 210 | 202.57 | 760 |
| July 30, 2026 | 214.09 | 206.84 | 206.84 | 214.09 | 203.11 | 535 |
| July 29, 2026 | 210 | 208.12 | 208.12 | 217.44 | 200 | 1,583 |
| July 28, 2026 | 200.8 | 202.17 | 202.17 | 203.64 | 200.8 | 300 |
| July 27, 2026 | 204.5 | 201.63 | 201.63 | 205 | 200.26 | 95 |