Biogen Inc. (BIIB)
NASDAQ: BIIB · Real-Time Price · USD
215.50
-3.55 (-1.62%)
At close: Sep 18, 2026, 4:00 PM EDT
218.38
+2.88 (1.34%)
After-hours: Sep 18, 2026, 7:58 PM EDT
Biogen Stock Price History
| Date | Open | High | Low | Close | Adj. Close | Change | Volume |
|---|---|---|---|---|---|---|---|
| Sep 18, 2026 | 219.05 | 220.17 | 215.26 | 215.50 | 215.50 | -1.62% | 2,530,231 |
| Sep 17, 2026 | 217.68 | 219.41 | 215.33 | 219.05 | 219.05 | 1.41% | 836,456 |
| Sep 16, 2026 | 216.41 | 218.29 | 214.81 | 216.01 | 216.01 | -0.07% | 605,900 |
| Sep 15, 2026 | 216.71 | 216.71 | 213.54 | 216.17 | 216.17 | -0.55% | 756,047 |
| Sep 14, 2026 | 221.00 | 222.25 | 215.56 | 217.36 | 217.36 | 0.10% | 629,931 |
| Sep 11, 2026 | 216.75 | 219.76 | 214.71 | 217.15 | 217.15 | 0.80% | 1,075,556 |
| Sep 10, 2026 | 209.92 | 216.70 | 208.93 | 215.43 | 215.43 | 2.23% | 936,643 |
| Sep 9, 2026 | 210.50 | 213.48 | 209.00 | 210.73 | 210.73 | -0.83% | 694,669 |
| Sep 8, 2026 | 215.45 | 217.28 | 210.54 | 212.50 | 212.50 | -3.77% | 617,829 |
| Sep 4, 2026 | 221.15 | 223.82 | 219.82 | 220.83 | 220.83 | -1.64% | 465,108 |
| Sep 3, 2026 | 225.44 | 225.80 | 221.23 | 224.51 | 224.51 | 0.83% | 550,745 |
| Sep 2, 2026 | 218.20 | 225.59 | 216.97 | 222.67 | 222.67 | 3.07% | 1,268,282 |
| Sep 1, 2026 | 218.11 | 219.30 | 213.60 | 216.04 | 216.04 | -0.28% | 785,496 |
| Aug 31, 2026 | 216.47 | 218.89 | 213.58 | 216.65 | 216.65 | -0.85% | 831,004 |
| Aug 28, 2026 | 221.17 | 222.00 | 216.78 | 218.50 | 218.50 | -1.35% | 517,484 |
| Aug 27, 2026 | 219.39 | 222.11 | 217.53 | 221.50 | 221.50 | 0.19% | 497,524 |
| Aug 26, 2026 | 219.34 | 222.00 | 218.69 | 221.07 | 221.07 | 0.14% | 647,334 |
| Aug 25, 2026 | 218.93 | 222.85 | 218.00 | 220.77 | 220.77 | 1.21% | 495,435 |
| Aug 24, 2026 | 216.40 | 218.50 | 213.96 | 218.12 | 218.12 | 0.62% | 649,828 |
| Aug 21, 2026 | 217.76 | 219.12 | 215.00 | 216.78 | 216.78 | 1.13% | 722,347 |
| Aug 20, 2026 | 217.98 | 221.29 | 214.16 | 214.35 | 214.35 | -3.25% | 808,625 |
| Aug 19, 2026 | 215.33 | 222.15 | 215.08 | 221.56 | 221.56 | 4.24% | 886,914 |
| Aug 18, 2026 | 211.00 | 214.07 | 210.01 | 212.55 | 212.55 | 1.63% | 694,009 |
| Aug 17, 2026 | 208.36 | 210.49 | 207.62 | 209.15 | 209.15 | -0.32% | 617,238 |
| Aug 14, 2026 | 210.01 | 210.79 | 208.22 | 209.83 | 209.83 | -0.39% | 554,816 |
| Aug 13, 2026 | 212.98 | 215.61 | 208.79 | 210.65 | 210.65 | 0.85% | 860,094 |
| Aug 12, 2026 | 203.52 | 209.22 | 201.00 | 208.87 | 208.87 | 2.44% | 789,441 |
| Aug 11, 2026 | 206.63 | 207.57 | 203.53 | 203.89 | 203.89 | -1.56% | 936,834 |
| Aug 10, 2026 | 206.70 | 210.02 | 206.29 | 207.13 | 207.13 | -0.39% | 706,425 |
| Aug 7, 2026 | 207.38 | 208.31 | 204.16 | 207.94 | 207.94 | 0.80% | 840,566 |
| Aug 6, 2026 | 208.75 | 209.03 | 202.03 | 206.28 | 206.28 | -0.17% | 892,772 |
| Aug 5, 2026 | 210.60 | 212.18 | 205.80 | 206.63 | 206.63 | -0.87% | 873,781 |
| Aug 4, 2026 | 200.96 | 209.74 | 199.93 | 208.45 | 208.45 | 3.29% | 1,205,704 |
| Aug 3, 2026 | 203.34 | 203.85 | 199.58 | 201.82 | 201.82 | -0.56% | 940,993 |
| Jul 31, 2026 | 207.51 | 208.05 | 202.57 | 202.95 | 202.95 | -2.40% | 1,062,258 |
| Jul 30, 2026 | 204.38 | 210.19 | 203.09 | 207.93 | 207.93 | -0.62% | 892,938 |
| Jul 29, 2026 | 210.50 | 218.59 | 206.27 | 209.23 | 209.23 | 1.76% | 2,400,174 |
| Jul 28, 2026 | 201.01 | 207.72 | 199.40 | 205.61 | 205.61 | 2.73% | 1,832,179 |
| Jul 27, 2026 | 202.75 | 204.47 | 199.83 | 200.14 | 200.14 | -1.01% | 762,581 |
| Jul 24, 2026 | 202.24 | 203.30 | 200.04 | 202.19 | 202.19 | 0.78% | 596,372 |
| Jul 23, 2026 | 197.04 | 203.60 | 196.92 | 200.62 | 200.62 | 1.46% | 1,032,070 |
| Jul 22, 2026 | 203.70 | 204.31 | 197.40 | 197.74 | 197.74 | -2.67% | 841,350 |
| Jul 21, 2026 | 199.47 | 203.70 | 198.59 | 203.16 | 203.16 | 1.61% | 652,841 |
| Jul 20, 2026 | 204.08 | 205.65 | 199.62 | 199.95 | 199.95 | -2.93% | 963,088 |
| Jul 17, 2026 | 208.60 | 215.79 | 203.40 | 205.99 | 205.99 | -1.40% | 1,151,283 |
| Jul 16, 2026 | 198.26 | 209.64 | 194.67 | 208.92 | 208.92 | 5.92% | 1,872,778 |
| Jul 15, 2026 | 191.21 | 198.58 | 186.03 | 197.24 | 197.24 | 2.76% | 2,067,350 |
| Jul 14, 2026 | 200.34 | 202.00 | 189.40 | 191.95 | 191.95 | -8.17% | 3,902,309 |
| Jul 13, 2026 | 199.33 | 210.87 | 197.74 | 209.03 | 209.03 | 4.96% | 2,259,821 |
| Jul 10, 2026 | 197.63 | 199.98 | 194.37 | 199.15 | 199.15 | 0.12% | 1,133,120 |