If you invested $1000 in Biogen Inc. (BIIB) 10 years ago, it would be worth $669.55 as of August 15, 2026, based on a reinvested dividends scenario. Over the same period, a $1000 investment made 5 years ago would be worth $610.86, while $1000 invested 1 year ago would be worth $1,513.92. This corresponds to total returns of -33.05%, -38.91%, 51.39%, respectively, with annualized returns of -3.93%, -9.39%, 51.39%.
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 |
|---|---|---|---|---|---|---|
| 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 |
| August 10, 2026 | 206.7 | 207.13 | 207.13 | 210.02 | 206.29 | 692,820 |
| August 07, 2026 | 207.38 | 207.94 | 207.94 | 208.31 | 204.16 | 814,472 |
| August 06, 2026 | 208.75 | 206.28 | 206.28 | 209.03 | 202.03 | 887,393 |
| August 05, 2026 | 210.6 | 206.63 | 206.63 | 212.18 | 205.8 | 873,635 |
| August 04, 2026 | 200.96 | 208.45 | 208.45 | 209.74 | 199.93 | 1.2M |
| August 03, 2026 | 203.34 | 201.82 | 201.82 | 203.85 | 199.58 | 940,856 |
| July 31, 2026 | 207.51 | 202.95 | 202.95 | 208.05 | 202.57 | 1.06M |
| July 30, 2026 | 204.38 | 207.93 | 207.93 | 210.19 | 203.09 | 885,493 |
| July 29, 2026 | 210.5 | 209.23 | 209.23 | 218.59 | 206.27 | 2.4M |
| July 28, 2026 | 201.01 | 205.61 | 205.61 | 207.72 | 199.4 | 1.82M |
| July 27, 2026 | 202.75 | 200.14 | 200.14 | 204.47 | 199.83 | 761,829 |
| July 23, 2026 | 197.04 | 200.62 | 200.62 | 203.6 | 196.92 | 1.02M |
| July 22, 2026 | 203.7 | 197.74 | 197.74 | 204.31 | 197.4 | 840,660 |
| July 21, 2026 | 199.47 | 203.16 | 203.16 | 203.7 | 198.59 | 652,830 |
| July 20, 2026 | 204.08 | 199.95 | 199.95 | 205.65 | 199.62 | 961,522 |
| July 17, 2026 | 208.6 | 205.99 | 205.99 | 215.79 | 203.4 | 1.15M |
| July 16, 2026 | 198.26 | 208.92 | 208.92 | 209.64 | 194.67 | 1.86M |
| July 15, 2026 | 191.21 | 197.24 | 197.24 | 198.58 | 186.03 | 2.07M |
| July 14, 2026 | 200.34 | 191.95 | 191.95 | 202 | 189.4 | 3.9M |
| July 13, 2026 | 199.33 | 209.03 | 209.03 | 210.87 | 197.74 | 2.25M |
| July 10, 2026 | 197.63 | 199.15 | 199.15 | 199.98 | 194.37 | 1.11M |
| July 09, 2026 | 198.92 | 198.91 | 198.91 | 201.01 | 196 | 1.63M |
| July 08, 2026 | 204.86 | 200.36 | 200.36 | 206.75 | 198.93 | 1.89M |
| July 07, 2026 | 211.86 | 205.7 | 205.7 | 212 | 205.65 | 1.13M |
| July 06, 2026 | 215.95 | 208.46 | 208.46 | 215.95 | 208.27 | 1.21M |
| July 02, 2026 | 212.74 | 216.12 | 216.12 | 219.02 | 210.75 | 1.15M |
| July 01, 2026 | 215.25 | 209.74 | 209.74 | 215.81 | 209.67 | 1.14M |
| June 30, 2026 | 218 | 216.06 | 216.06 | 218 | 212.58 | 1.04M |
| June 29, 2026 | 215.74 | 216.63 | 216.63 | 219.72 | 214.08 | 1.24M |
| June 26, 2026 | 202.53 | 216.03 | 216.03 | 218.06 | 202.29 | 2.36M |
| June 25, 2026 | 201.63 | 201.96 | 201.96 | 206.67 | 200.2 | 1.28M |
| June 24, 2026 | 199.34 | 199.59 | 199.59 | 202.06 | 198.66 | 1.28M |
| June 23, 2026 | 198.88 | 197.19 | 197.19 | 201.22 | 197.01 | 992,373 |
| June 22, 2026 | 199.48 | 199.71 | 199.71 | 200.98 | 194.74 | 1.67M |
| June 18, 2026 | 200.22 | 196.58 | 196.58 | 200.99 | 193.2 | 1.72M |
| June 17, 2026 | 195.14 | 198.67 | 198.67 | 201.75 | 194.04 | 1M |
| June 16, 2026 | 199.69 | 195.61 | 195.61 | 200.26 | 194.04 | 906,696 |
| June 15, 2026 | 198.37 | 198.64 | 198.64 | 199.37 | 195.89 | 877,518 |
| June 12, 2026 | 200.57 | 200.05 | 200.05 | 203.45 | 199.06 | 837,285 |
| June 11, 2026 | 195.49 | 199.96 | 199.96 | 201.18 | 194.24 | 909,629 |
| June 10, 2026 | 200.21 | 194.24 | 194.24 | 201.94 | 194.1 | 1.07M |
| June 09, 2026 | 195.51 | 199.1 | 199.1 | 199.63 | 193.45 | 922,061 |
| June 08, 2026 | 197.25 | 192.62 | 192.62 | 198.7 | 192.18 | 1.11M |
| June 05, 2026 | 196.45 | 195.34 | 195.34 | 200.66 | 195.14 | 880,127 |
| June 04, 2026 | 198 | 196.45 | 196.45 | 199.9 | 196.35 | 718,925 |
| June 03, 2026 | 187.69 | 195.96 | 195.96 | 196.36 | 187.48 | 876,834 |
| June 02, 2026 | 190.09 | 188.83 | 188.83 | 190.58 | 184.9 | 964,377 |
| June 01, 2026 | 194.5 | 192.23 | 192.23 | 195.28 | 191.67 | 841,494 |
| May 29, 2026 | 195.55 | 196 | 196 | 198.46 | 195.11 | 1.86M |
| May 28, 2026 | 196.97 | 196.39 | 196.39 | 198 | 194.5 | 555,954 |
| May 27, 2026 | 194.11 | 196.97 | 196.97 | 199.8 | 194.11 | 893,034 |
| May 26, 2026 | 194.3 | 193.08 | 193.08 | 195.5 | 192.27 | 930,137 |
| May 22, 2026 | 190.53 | 193.76 | 193.76 | 194.75 | 190.01 | 892,907 |
| May 21, 2026 | 187.4 | 189.47 | 189.47 | 190.27 | 185.85 | 1.47M |
| May 20, 2026 | 191.41 | 187.8 | 187.8 | 193.38 | 186.37 | 919,583 |
| May 19, 2026 | 191.72 | 190.56 | 190.56 | 193.03 | 188.64 | 1.05M |