If you invested $1000 in Biogen Inc. (BIIB) 10 years ago, it would be worth $860.77 as of November 05, 2026, based on a reinvested dividends scenario. Over the same period, a $1000 investment made 5 years ago would be worth $913.09, while $1000 invested 1 year ago would be worth $1,658.48. This corresponds to total returns of -13.92%, -8.69%, 65.85%, respectively, with annualized returns of -1.49%, -1.8%, 65.85%.
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 |
|---|---|---|---|---|---|---|
| November 04, 2026 | 253.54 | 254.46 | 254.46 | 255.35 | 246.49 | 1.21M |
| November 03, 2026 | 247.32 | 248.93 | 248.93 | 253.14 | 246.25 | 1.06M |
| November 02, 2026 | 253.81 | 249.01 | 249.01 | 255.53 | 247.91 | 1.17M |
| October 30, 2026 | 255.39 | 253.62 | 253.62 | 258.73 | 251.19 | 1.3M |
| October 29, 2026 | 250.15 | 249.65 | 249.65 | 255.55 | 246.48 | 1.14M |
| October 28, 2026 | 244.93 | 244.05 | 244.05 | 258.78 | 243.03 | 2.32M |
| October 27, 2026 | 250.35 | 252.73 | 252.73 | 253.98 | 248.46 | 1.39M |
| October 26, 2026 | 251.02 | 252.26 | 252.26 | 254.11 | 249.61 | 958,805 |
| October 23, 2026 | 251.68 | 250.69 | 250.69 | 252.44 | 246.15 | 1.16M |
| October 22, 2026 | 240.61 | 253.84 | 253.84 | 254.41 | 240.02 | 2.24M |
| October 21, 2026 | 242.02 | 240.98 | 240.98 | 243.32 | 240.13 | 812,870 |
| October 20, 2026 | 236.79 | 243.1 | 243.1 | 244.65 | 235.96 | 1.49M |
| October 19, 2026 | 231.81 | 233.48 | 233.48 | 236 | 231.04 | 949,432 |
| October 16, 2026 | 235.75 | 232.65 | 232.65 | 236.87 | 232.36 | 1.46M |
| October 15, 2026 | 236.46 | 235.35 | 235.35 | 240.99 | 235.22 | 1.57M |
| October 14, 2026 | 228.99 | 232.83 | 232.83 | 234.2 | 228 | 1.86M |
| October 13, 2026 | 230.34 | 228.9 | 228.9 | 231.04 | 226.71 | 1.05M |
| October 12, 2026 | 233.98 | 229.41 | 229.41 | 238.24 | 229 | 1.46M |
| October 09, 2026 | 220.62 | 225.71 | 225.71 | 227.2 | 219.23 | 814,919 |
| October 08, 2026 | 220.15 | 218.43 | 218.43 | 223.09 | 215.73 | 1.34M |
| October 07, 2026 | 222.93 | 222.15 | 222.15 | 228 | 221.4 | 1.3M |
| October 06, 2026 | 224.53 | 222.89 | 222.89 | 225.97 | 218 | 1.01M |
| October 05, 2026 | 219.9 | 223.59 | 223.59 | 223.85 | 218.22 | 936,864 |
| October 02, 2026 | 222.98 | 219.88 | 219.88 | 224.08 | 219.81 | 774,015 |
| October 01, 2026 | 225.5 | 222.82 | 222.82 | 228.31 | 222.5 | 1.75M |
| September 30, 2026 | 227.23 | 225.88 | 225.88 | 229.36 | 225.51 | 1.55M |
| September 29, 2026 | 227.02 | 227.07 | 227.07 | 229.41 | 224.45 | 1.1M |
| September 28, 2026 | 225.87 | 228.69 | 228.69 | 230.49 | 225.51 | 1.31M |
| September 25, 2026 | 228.27 | 227.6 | 227.6 | 228.92 | 223.76 | 939,196 |
| September 24, 2026 | 226.8 | 226.36 | 226.36 | 228.72 | 224.31 | 1.02M |
| September 23, 2026 | 226.94 | 227.53 | 227.53 | 229.19 | 222.36 | 1.39M |
| September 22, 2026 | 219.22 | 225.36 | 225.36 | 226.43 | 219 | 1.11M |
| September 21, 2026 | 216.14 | 219.07 | 219.07 | 221.92 | 214.59 | 928,545 |
| September 18, 2026 | 219.05 | 215.5 | 215.5 | 220.17 | 215.26 | 2.63M |
| September 17, 2026 | 217.68 | 219.05 | 219.05 | 219.41 | 215.33 | 836,656 |
| September 16, 2026 | 216.41 | 216.01 | 216.01 | 218.29 | 214.81 | 605,882 |
| September 15, 2026 | 216.71 | 216.17 | 216.17 | 216.71 | 213.54 | 755,785 |
| September 11, 2026 | 216.75 | 217.15 | 217.15 | 219.76 | 214.71 | 1.08M |
| September 10, 2026 | 209.92 | 215.43 | 215.43 | 216.7 | 208.93 | 928,007 |
| September 09, 2026 | 210.5 | 210.73 | 210.73 | 213.48 | 209 | 693,725 |
| September 08, 2026 | 215.45 | 212.5 | 212.5 | 217.28 | 210.54 | 617,404 |
| September 04, 2026 | 221.15 | 220.83 | 220.83 | 223.82 | 219.82 | 464,803 |
| September 03, 2026 | 225.44 | 224.51 | 224.51 | 225.8 | 221.23 | 549,658 |
| September 02, 2026 | 218.2 | 222.67 | 222.67 | 225.59 | 216.97 | 1.27M |
| September 01, 2026 | 218.11 | 216.04 | 216.04 | 219.3 | 213.6 | 742,042 |
| August 31, 2026 | 216.47 | 216.65 | 216.65 | 218.89 | 213.58 | 807,693 |
| August 28, 2026 | 221.17 | 218.5 | 218.5 | 222 | 216.78 | 516,658 |
| August 27, 2026 | 219.39 | 221.5 | 221.5 | 222.11 | 217.53 | 489,135 |
| August 26, 2026 | 219.34 | 221.07 | 221.07 | 222 | 218.69 | 639,457 |
| August 25, 2026 | 218.93 | 220.77 | 220.77 | 222.85 | 218 | 495,313 |
| August 24, 2026 | 216.4 | 218.12 | 218.12 | 218.5 | 213.96 | 587,358 |
| August 21, 2026 | 217.76 | 216.78 | 216.78 | 219.12 | 215 | 722,317 |
| August 20, 2026 | 217.98 | 214.35 | 214.35 | 221.29 | 214.16 | 808,370 |
| August 19, 2026 | 215.33 | 221.56 | 221.56 | 222.15 | 215.08 | 880,796 |
| August 18, 2026 | 211 | 212.55 | 212.55 | 214.07 | 210.01 | 693,967 |
| August 17, 2026 | 208.36 | 209.15 | 209.15 | 210.49 | 207.62 | 617,099 |
| August 14, 2026 | 210.01 | 209.83 | 209.83 | 210.79 | 208.22 | 554,423 |
| August 13, 2026 | 212.98 | 210.65 | 210.65 | 215.61 | 208.79 | 860,069 |
| August 12, 2026 | 203.52 | 208.87 | 208.87 | 209.22 | 201 | 786,185 |
| August 11, 2026 | 206.63 | 203.89 | 203.89 | 207.57 | 203.53 | 936,443 |