Biogen Inc. (BIIB)
NASDAQ: BIIB · Real-Time Price · USD
143.81
-1.06 (-0.73%)
At close: Sep 18, 2025, 4:00 PM EDT
143.82
+0.01 (0.01%)
After-hours: Sep 18, 2025, 7:44 PM EDT
Biogen Stock Price History
Historical Data
| Date | Open | High | Low | Close | Adj. Close | Change | Volume |
|---|---|---|---|---|---|---|---|
| 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 |
| Aug 21, 2025 | 138.26 | 140.20 | 137.59 | 139.12 | 139.12 | 0.09% | 1,074,281 |
| Aug 20, 2025 | 139.10 | 140.50 | 137.77 | 138.99 | 138.99 | 0.09% | 1,286,658 |
| Aug 19, 2025 | 136.37 | 139.58 | 136.02 | 138.86 | 138.86 | 2.17% | 1,447,803 |
| Aug 18, 2025 | 140.00 | 141.18 | 135.74 | 135.91 | 135.91 | -1.94% | 1,813,871 |
| Aug 15, 2025 | 136.16 | 138.83 | 135.88 | 138.60 | 138.60 | 2.71% | 1,644,116 |
| Aug 14, 2025 | 134.51 | 135.23 | 132.16 | 134.94 | 134.94 | -0.18% | 1,169,840 |
| Aug 13, 2025 | 129.62 | 135.38 | 129.40 | 135.19 | 135.19 | 4.86% | 1,549,212 |
| Aug 12, 2025 | 128.47 | 131.10 | 128.25 | 128.93 | 128.93 | 0.73% | 1,127,617 |
| Aug 11, 2025 | 131.16 | 133.73 | 127.71 | 128.00 | 128.00 | -2.04% | 1,070,293 |
| Aug 8, 2025 | 127.50 | 131.26 | 127.00 | 130.67 | 130.67 | 2.29% | 1,327,710 |
| Aug 7, 2025 | 130.02 | 130.68 | 127.65 | 127.75 | 127.75 | -1.23% | 1,718,239 |
| Aug 6, 2025 | 132.42 | 132.67 | 128.90 | 129.34 | 129.34 | -2.67% | 1,538,660 |
| Aug 5, 2025 | 131.91 | 134.16 | 131.57 | 132.89 | 132.89 | 0.52% | 1,395,619 |
| Aug 4, 2025 | 132.33 | 133.98 | 130.39 | 132.20 | 132.20 | 0.19% | 1,897,855 |
| Aug 1, 2025 | 128.96 | 132.90 | 124.56 | 131.95 | 131.95 | 3.09% | 2,798,550 |
| Jul 31, 2025 | 133.00 | 135.43 | 127.24 | 128.00 | 128.00 | 1.07% | 3,240,096 |
| Jul 30, 2025 | 128.56 | 129.78 | 125.97 | 126.64 | 126.64 | -0.99% | 1,892,068 |
| Jul 29, 2025 | 128.54 | 129.26 | 127.60 | 127.90 | 127.90 | -1.07% | 1,108,783 |
| Jul 28, 2025 | 131.35 | 131.85 | 128.43 | 129.28 | 129.28 | -1.70% | 1,045,656 |
| Jul 25, 2025 | 133.05 | 133.05 | 130.13 | 131.52 | 131.52 | -0.81% | 977,034 |
| Jul 24, 2025 | 130.78 | 132.65 | 130.00 | 132.59 | 132.59 | 1.23% | 1,280,623 |
| Jul 23, 2025 | 129.44 | 131.25 | 128.36 | 130.98 | 130.98 | 2.45% | 1,127,502 |
| Jul 22, 2025 | 123.38 | 127.94 | 123.38 | 127.85 | 127.85 | 4.21% | 1,319,120 |
| Jul 21, 2025 | 124.98 | 125.42 | 121.05 | 122.68 | 122.68 | -1.85% | 1,403,476 |
| Jul 18, 2025 | 129.37 | 129.58 | 124.68 | 124.99 | 124.99 | -2.88% | 1,524,966 |
| Jul 17, 2025 | 128.18 | 129.21 | 127.31 | 128.69 | 128.69 | 0.18% | 1,151,166 |
| Jul 16, 2025 | 128.50 | 129.51 | 127.42 | 128.46 | 128.46 | 0.75% | 1,234,689 |
| Jul 15, 2025 | 132.96 | 133.36 | 127.47 | 127.50 | 127.50 | -4.21% | 1,317,080 |
| Jul 14, 2025 | 133.56 | 134.21 | 132.40 | 133.11 | 133.11 | -0.82% | 694,370 |
| Jul 11, 2025 | 133.49 | 134.59 | 132.37 | 134.21 | 134.21 | -0.83% | 1,137,577 |
| Jul 10, 2025 | 133.45 | 137.19 | 132.77 | 135.33 | 135.33 | 1.74% | 992,049 |