Biogen Inc. (BIIB)
NASDAQ: BIIB · Real-Time Price · USD
154.27
+4.66 (3.11%)
At close: Oct 31, 2025, 4:00 PM EDT
152.77
-1.50 (-0.97%)
After-hours: Oct 31, 2025, 5:55 PM EDT
Biogen Stock Price History
Historical Data
| Date | Open | High | Low | Close | Adj. Close | Change | Volume |
|---|---|---|---|---|---|---|---|
| Oct 31, 2025 | 147.99 | 155.18 | 146.52 | 154.27 | 154.27 | 3.11% | 2,181,264 |
| Oct 30, 2025 | 140.10 | 154.44 | 138.00 | 149.61 | 149.61 | 1.18% | 2,745,188 |
| Oct 29, 2025 | 148.82 | 149.91 | 147.54 | 147.86 | 147.86 | -0.85% | 2,450,701 |
| Oct 28, 2025 | 150.01 | 150.30 | 148.37 | 149.13 | 149.13 | -0.86% | 1,662,855 |
| Oct 27, 2025 | 150.07 | 150.92 | 148.10 | 150.43 | 150.43 | 0.36% | 1,214,395 |
| Oct 24, 2025 | 151.09 | 151.92 | 148.98 | 149.89 | 149.89 | -0.13% | 1,338,315 |
| Oct 23, 2025 | 148.99 | 150.29 | 147.57 | 150.08 | 150.08 | 1.60% | 1,245,964 |
| Oct 22, 2025 | 147.37 | 149.12 | 146.25 | 147.72 | 147.72 | 1.03% | 1,403,299 |
| Oct 21, 2025 | 146.09 | 147.89 | 144.29 | 146.22 | 146.22 | -0.28% | 895,048 |
| Oct 20, 2025 | 143.31 | 147.47 | 142.41 | 146.63 | 146.63 | 2.54% | 1,316,452 |
| Oct 17, 2025 | 142.10 | 144.33 | 141.67 | 143.00 | 143.00 | 0.52% | 1,010,007 |
| Oct 16, 2025 | 144.05 | 147.48 | 141.70 | 142.26 | 142.26 | -0.97% | 1,469,099 |
| Oct 15, 2025 | 144.74 | 145.19 | 142.29 | 143.66 | 143.66 | -1.14% | 1,337,176 |
| Oct 14, 2025 | 144.09 | 146.88 | 142.20 | 145.31 | 145.31 | 0.43% | 1,283,553 |
| Oct 13, 2025 | 146.47 | 147.56 | 144.65 | 144.69 | 144.69 | -1.28% | 1,124,466 |
| Oct 10, 2025 | 150.00 | 150.20 | 144.74 | 146.57 | 146.57 | -2.03% | 1,724,990 |
| Oct 9, 2025 | 151.37 | 152.15 | 148.17 | 149.61 | 149.61 | -0.90% | 1,600,465 |
| Oct 8, 2025 | 152.36 | 152.36 | 149.64 | 150.97 | 150.97 | -0.81% | 1,333,277 |
| Oct 7, 2025 | 154.52 | 154.58 | 151.97 | 152.21 | 152.21 | -1.19% | 1,372,833 |
| Oct 6, 2025 | 159.61 | 159.70 | 153.10 | 154.05 | 154.05 | -3.65% | 1,817,888 |
| Oct 3, 2025 | 156.46 | 160.20 | 155.97 | 159.88 | 159.88 | 2.98% | 2,878,796 |
| Oct 2, 2025 | 154.00 | 157.85 | 152.22 | 155.25 | 155.25 | 0.67% | 2,882,551 |
| Oct 1, 2025 | 140.82 | 154.44 | 140.70 | 154.22 | 154.22 | 10.09% | 4,059,913 |
| Sep 30, 2025 | 138.46 | 141.04 | 136.94 | 140.08 | 140.08 | 1.13% | 1,369,066 |
| Sep 29, 2025 | 137.49 | 138.80 | 135.39 | 138.52 | 138.52 | 0.84% | 1,285,534 |
| Sep 26, 2025 | 136.79 | 138.00 | 135.81 | 137.37 | 137.37 | 1.25% | 1,677,223 |
| Sep 25, 2025 | 138.40 | 140.68 | 135.41 | 135.67 | 135.67 | -1.45% | 1,260,311 |
| Sep 24, 2025 | 138.52 | 139.28 | 136.20 | 137.67 | 137.67 | -1.18% | 1,309,389 |
| Sep 23, 2025 | 140.27 | 141.38 | 138.73 | 139.31 | 139.31 | -0.96% | 1,103,063 |
| Sep 22, 2025 | 142.12 | 142.64 | 140.02 | 140.66 | 140.66 | -1.29% | 1,446,078 |
| Sep 19, 2025 | 143.96 | 144.43 | 141.49 | 142.50 | 142.50 | -0.91% | 3,748,754 |
| Sep 18, 2025 | 146.30 | 146.45 | 143.37 | 143.81 | 143.81 | -0.73% | 1,514,476 |
| Sep 17, 2025 | 143.48 | 146.68 | 143.39 | 144.87 | 144.87 | 0.83% | 1,502,045 |
| Sep 16, 2025 | 143.51 | 147.23 | 143.02 | 143.68 | 143.68 | 0.25% | 1,936,056 |
| Sep 15, 2025 | 144.82 | 145.99 | 141.12 | 143.32 | 143.32 | -1.06% | 1,432,587 |
| Sep 12, 2025 | 148.08 | 150.28 | 144.84 | 144.86 | 144.86 | -2.67% | 1,810,892 |
| Sep 11, 2025 | 143.47 | 149.07 | 142.86 | 148.84 | 148.84 | 4.37% | 1,714,600 |
| Sep 10, 2025 | 143.00 | 143.45 | 139.54 | 142.61 | 142.61 | -0.69% | 1,278,801 |
| Sep 9, 2025 | 141.16 | 143.74 | 140.51 | 143.60 | 143.60 | 1.59% | 1,490,789 |
| Sep 8, 2025 | 140.00 | 143.23 | 137.20 | 141.35 | 141.35 | 0.48% | 1,624,388 |
| Sep 5, 2025 | 140.13 | 144.20 | 139.96 | 140.67 | 140.67 | 0.52% | 1,561,897 |
| Sep 4, 2025 | 141.78 | 142.28 | 137.14 | 139.94 | 139.94 | -1.19% | 1,529,091 |
| Sep 3, 2025 | 139.56 | 145.27 | 139.56 | 141.62 | 141.62 | 1.43% | 2,244,285 |
| Sep 2, 2025 | 133.55 | 140.06 | 133.53 | 139.63 | 139.63 | 5.60% | 2,466,935 |
| Aug 29, 2025 | 132.50 | 133.48 | 131.52 | 132.22 | 132.22 | -0.32% | 1,083,013 |
| Aug 28, 2025 | 136.36 | 136.36 | 132.04 | 132.65 | 132.65 | -2.72% | 1,558,097 |
| Aug 27, 2025 | 136.00 | 138.50 | 135.79 | 136.36 | 136.36 | -0.26% | 1,403,137 |
| Aug 26, 2025 | 135.85 | 136.91 | 135.22 | 136.72 | 136.72 | 0.26% | 1,580,037 |
| Aug 25, 2025 | 139.01 | 139.75 | 136.14 | 136.36 | 136.36 | -2.12% | 861,976 |
| Aug 22, 2025 | 140.41 | 142.32 | 138.65 | 139.31 | 139.31 | 0.14% | 1,199,214 |