Biogen Inc (BIIB) — Price History
As of 2026-08-07 — refreshed nightly from the Closelook data lake. Diary readings, not advice.
Daily prices
| Date | Open | High | Low | Close | Chg % | Volume |
|---|---|---|---|---|---|---|
| 2026-08-07 | 207.38 | 208.31 | 204.16 | 207.94 | +0.80% | 840,500 |
| 2026-08-06 | 208.75 | 209.03 | 202.03 | 206.28 | -0.17% | 892,600 |
| 2026-08-05 | 210.60 | 212.18 | 205.80 | 206.63 | -0.87% | 873,700 |
| 2026-08-04 | 200.96 | 209.74 | 199.93 | 208.45 | +3.29% | 1,205,400 |
| 2026-08-03 | 203.34 | 203.85 | 199.58 | 201.82 | -0.56% | 940,900 |
| 2026-07-31 | 207.51 | 208.05 | 202.57 | 202.95 | -2.40% | 1,062,000 |
| 2026-07-30 | 204.38 | 210.19 | 203.09 | 207.93 | -0.62% | 892,900 |
| 2026-07-29 | 210.50 | 218.59 | 206.27 | 209.23 | +1.76% | 2,400,100 |
| 2026-07-28 | 201.01 | 207.72 | 199.40 | 205.61 | +2.73% | 1,831,900 |
| 2026-07-27 | 202.75 | 204.47 | 199.83 | 200.14 | -1.01% | 762,600 |
| 2026-07-24 | 202.24 | 203.30 | 200.04 | 202.19 | +0.78% | 596,300 |
| 2026-07-23 | 197.04 | 203.60 | 196.92 | 200.62 | +1.46% | 1,032,100 |
| 2026-07-22 | 203.70 | 204.31 | 197.40 | 197.74 | -2.67% | 841,300 |
| 2026-07-21 | 199.47 | 203.70 | 198.59 | 203.16 | +1.61% | 652,800 |
| 2026-07-20 | 204.08 | 205.65 | 199.62 | 199.95 | -2.93% | 962,700 |
| 2026-07-17 | 208.60 | 215.79 | 203.40 | 205.99 | -1.40% | 1,151,300 |
| 2026-07-16 | 198.26 | 209.64 | 194.67 | 208.92 | +5.92% | 1,872,700 |
| 2026-07-15 | 191.21 | 198.58 | 186.03 | 197.24 | +2.76% | 2,067,300 |
| 2026-07-14 | 200.34 | 202.00 | 189.40 | 191.95 | -8.17% | 3,902,100 |
| 2026-07-13 | 199.33 | 210.87 | 197.74 | 209.03 | +4.96% | 2,259,800 |
| 2026-07-10 | 197.63 | 199.98 | 194.37 | 199.15 | +0.12% | 1,133,100 |
| 2026-07-09 | 198.92 | 201.01 | 196.00 | 198.91 | -0.72% | 1,657,300 |
| 2026-07-08 | 204.86 | 206.75 | 198.93 | 200.36 | -2.60% | 1,947,700 |
| 2026-07-07 | 211.86 | 212.00 | 205.65 | 205.70 | -1.32% | 1,156,900 |
| 2026-07-06 | 215.95 | 215.95 | 208.27 | 208.46 | -3.54% | 1,218,400 |
| 2026-07-02 | 212.74 | 219.02 | 210.75 | 216.12 | +3.04% | 1,155,100 |
| 2026-07-01 | 215.25 | 215.81 | 209.67 | 209.74 | -2.93% | 1,138,600 |
| 2026-06-30 | 218.00 | 218.00 | 212.58 | 216.06 | -0.26% | 1,091,300 |
| 2026-06-29 | 215.74 | 219.72 | 214.08 | 216.63 | +0.28% | 1,279,800 |
| 2026-06-26 | 202.53 | 218.06 | 202.29 | 216.03 | +6.97% | 2,374,400 |
| 2026-06-25 | 201.63 | 206.67 | 200.20 | 201.96 | +1.19% | 1,328,900 |
| 2026-06-24 | 199.34 | 202.06 | 198.66 | 199.59 | +1.22% | 1,348,800 |
| 2026-06-23 | 198.88 | 201.22 | 197.01 | 197.19 | -1.26% | 1,053,500 |
| 2026-06-22 | 199.48 | 200.98 | 194.74 | 199.71 | +1.59% | 1,675,000 |
| 2026-06-18 | 200.22 | 200.99 | 193.20 | 196.58 | -1.05% | 1,729,800 |
| 2026-06-17 | 195.14 | 201.75 | 194.04 | 198.67 | +1.56% | 1,009,000 |
| 2026-06-16 | 199.69 | 200.26 | 194.04 | 195.61 | -1.53% | 1,110,700 |
| 2026-06-15 | 198.37 | 199.37 | 195.89 | 198.64 | -0.70% | 883,900 |
| 2026-06-12 | 200.57 | 203.45 | 199.06 | 200.05 | +0.05% | 837,300 |
| 2026-06-11 | 195.49 | 201.18 | 194.24 | 199.96 | +2.94% | 914,700 |
| 2026-06-10 | 200.21 | 201.94 | 194.10 | 194.24 | -2.44% | 1,071,200 |
| 2026-06-09 | 195.51 | 199.63 | 193.45 | 199.10 | +3.36% | 934,200 |
| 2026-06-08 | 197.25 | 198.70 | 192.18 | 192.62 | -1.39% | 1,162,400 |
| 2026-06-05 | 196.45 | 200.66 | 195.14 | 195.34 | -0.57% | 880,400 |
| 2026-06-04 | 198.00 | 199.90 | 196.35 | 196.45 | +0.25% | 719,100 |
| 2026-06-03 | 187.69 | 196.51 | 187.48 | 195.96 | +3.78% | 891,500 |
| 2026-06-02 | 190.09 | 190.58 | 184.90 | 188.83 | -1.77% | 1,097,800 |
| 2026-06-01 | 194.50 | 195.28 | 191.67 | 192.23 | -1.92% | 841,500 |
| 2026-05-29 | 195.55 | 198.46 | 195.11 | 196.00 | -0.20% | 1,905,400 |
| 2026-05-28 | 196.97 | 198.00 | 194.50 | 196.39 | -0.29% | 556,200 |
| 2026-05-27 | 194.11 | 199.80 | 194.11 | 196.97 | +2.01% | 893,000 |
| 2026-05-26 | 194.30 | 195.50 | 192.27 | 193.08 | -0.35% | 930,100 |
| 2026-05-22 | 190.53 | 194.75 | 190.01 | 193.76 | +2.26% | 892,900 |
| 2026-05-21 | 187.40 | 190.27 | 185.85 | 189.47 | +0.89% | 1,475,200 |
| 2026-05-20 | 191.41 | 193.38 | 186.37 | 187.80 | -1.45% | 919,700 |
| 2026-05-19 | 191.72 | 193.03 | 188.64 | 190.56 | -0.70% | 1,054,100 |
| 2026-05-18 | 191.25 | 193.37 | 189.19 | 191.91 | -0.54% | 1,051,300 |
| 2026-05-15 | 191.83 | 194.91 | 190.66 | 192.95 | +0.83% | 1,252,200 |
| 2026-05-14 | 200.25 | 205.00 | 189.49 | 191.37 | -6.43% | 2,812,900 |
| 2026-05-13 | 199.33 | 205.97 | 198.86 | 204.53 | +2.59% | 1,271,900 |
| 2026-05-12 | 198.47 | 202.40 | 196.47 | 199.36 | +0.71% | 1,145,400 |
| 2026-05-11 | 194.76 | 200.31 | 194.75 | 197.95 | +2.33% | 1,772,200 |
| 2026-05-08 | 189.68 | 195.20 | 189.50 | 193.45 | +1.08% | 931,500 |
| 2026-05-07 | 190.34 | 192.10 | 188.86 | 191.38 | +0.37% | 735,600 |
| 2026-05-06 | 189.13 | 191.17 | 188.30 | 190.68 | +0.82% | 741,300 |
| 2026-05-05 | 187.38 | 189.69 | 186.00 | 189.13 | +1.03% | 586,100 |
| 2026-05-04 | 186.28 | 187.51 | 185.44 | 187.21 | +0.08% | 626,600 |
| 2026-05-01 | 189.28 | 190.57 | 186.14 | 187.06 | -1.17% | 696,800 |
| 2026-04-30 | 194.02 | 195.98 | 187.16 | 189.28 | -2.62% | 1,550,500 |
| 2026-04-29 | 183.12 | 195.89 | 180.18 | 194.38 | +6.00% | 2,453,400 |
| 2026-04-28 | 182.45 | 184.41 | 181.89 | 183.38 | +1.50% | 1,235,600 |
| 2026-04-27 | 183.16 | 186.15 | 179.15 | 180.67 | -2.01% | 1,101,400 |
| 2026-04-24 | 186.65 | 186.65 | 183.17 | 184.38 | -1.86% | 723,300 |
| 2026-04-23 | 189.46 | 190.32 | 187.01 | 187.88 | -1.15% | 816,300 |
| 2026-04-22 | 189.31 | 192.75 | 188.67 | 190.07 | +2.22% | 1,327,900 |
| 2026-04-21 | 184.52 | 187.74 | 181.75 | 185.95 | +1.42% | 1,063,200 |
| 2026-04-20 | 179.54 | 184.26 | 178.72 | 183.34 | +3.38% | 1,484,400 |
| 2026-04-17 | 176.29 | 178.41 | 175.69 | 177.35 | +0.76% | 1,239,500 |
| 2026-04-16 | 178.82 | 179.99 | 174.85 | 176.02 | -2.50% | 953,500 |
| 2026-04-15 | 179.36 | 180.87 | 177.70 | 180.54 | +0.88% | 1,168,700 |
| 2026-04-14 | 177.71 | 181.77 | 177.45 | 178.96 | +1.47% | 1,550,600 |
| 2026-04-13 | 172.62 | 176.79 | 171.22 | 176.37 | +1.97% | 1,415,000 |
| 2026-04-10 | 177.97 | 177.97 | 172.32 | 172.97 | -2.34% | 1,501,900 |
| 2026-04-09 | 177.81 | 180.06 | 174.97 | 177.11 | -1.55% | 1,266,500 |
| 2026-04-08 | 178.24 | 180.24 | 176.35 | 179.90 | +2.44% | 1,289,700 |
| 2026-04-07 | 172.20 | 175.64 | 170.43 | 175.61 | +1.90% | 1,515,500 |
| 2026-04-06 | 177.00 | 177.39 | 168.64 | 172.34 | -2.82% | 2,149,100 |
| 2026-04-02 | 181.46 | 182.23 | 176.39 | 177.34 | -3.50% | 1,339,300 |
| 2026-04-01 | 183.16 | 186.31 | 181.71 | 183.78 | +0.25% | 1,390,200 |
| 2026-03-31 | 179.46 | 184.68 | 171.37 | 183.33 | -2.26% | 2,719,800 |
| 2026-03-30 | 186.16 | 190.09 | 185.51 | 187.57 | +2.03% | 799,900 |
| 2026-03-27 | 191.06 | 191.06 | 183.01 | 183.84 | -3.78% | 935,100 |
| 2026-03-26 | 189.00 | 192.28 | 188.36 | 191.06 | +0.99% | 879,100 |
| 2026-03-25 | 184.91 | 189.38 | 184.91 | 189.18 | +2.85% | 775,200 |
| 2026-03-24 | 182.63 | 184.84 | 180.33 | 183.94 | +0.16% | 644,100 |
| 2026-03-23 | 183.48 | 185.00 | 183.00 | 183.64 | +1.20% | 1,011,800 |
| 2026-03-20 | 183.13 | 183.69 | 180.47 | 181.46 | -1.06% | 2,214,200 |
| 2026-03-19 | 182.18 | 185.45 | 181.68 | 183.41 | +0.60% | 768,600 |
| 2026-03-18 | 184.13 | 184.32 | 180.48 | 182.31 | -1.61% | 846,200 |
| 2026-03-17 | 184.73 | 186.52 | 183.20 | 185.29 | +1.11% | 810,200 |
| 2026-03-16 | 182.75 | 184.62 | 181.88 | 183.26 | +0.94% | 995,900 |
| 2026-03-13 | 185.99 | 188.00 | 181.46 | 181.55 | -1.81% | 1,092,300 |
| 2026-03-12 | 187.86 | 188.91 | 184.63 | 184.90 | -2.93% | 851,400 |
| 2026-03-11 | 187.54 | 192.99 | 187.54 | 190.48 | +1.10% | 864,300 |
| 2026-03-10 | 187.69 | 190.78 | 187.02 | 188.41 | +0.09% | 687,500 |
| 2026-03-09 | 183.91 | 188.50 | 182.60 | 188.24 | +1.82% | 651,600 |
| 2026-03-06 | 186.25 | 186.25 | 181.24 | 184.87 | -1.71% | 772,800 |
| 2026-03-05 | 187.97 | 190.99 | 185.95 | 188.08 | -0.98% | 893,300 |
| 2026-03-04 | 185.06 | 190.37 | 183.16 | 189.94 | +3.22% | 952,900 |
| 2026-03-03 | 185.01 | 187.05 | 181.79 | 184.02 | -2.14% | 1,049,900 |
| 2026-03-02 | 190.22 | 190.75 | 186.72 | 188.05 | -1.97% | 691,600 |
| 2026-02-27 | 187.51 | 192.46 | 186.62 | 191.82 | +2.02% | 1,402,100 |
| 2026-02-26 | 190.30 | 190.74 | 185.90 | 188.02 | -1.42% | 988,000 |
| 2026-02-25 | 194.23 | 196.73 | 189.89 | 190.73 | -2.25% | 942,700 |
| 2026-02-24 | 196.03 | 198.72 | 194.43 | 195.13 | -0.62% | 716,000 |
| 2026-02-23 | 191.82 | 197.05 | 189.11 | 196.34 | +2.24% | 878,900 |
| 2026-02-20 | 190.78 | 192.60 | 189.95 | 192.03 | -0.03% | 799,200 |
| 2026-02-19 | 193.51 | 195.00 | 191.05 | 192.08 | -1.06% | 993,200 |
| 2026-02-18 | 195.32 | 195.68 | 193.11 | 194.13 | -0.76% | 1,049,000 |
| 2026-02-17 | 197.46 | 200.29 | 193.37 | 195.62 | -0.46% | 986,500 |
| 2026-02-13 | 196.27 | 199.50 | 195.52 | 196.52 | +0.52% | 1,352,800 |
| 2026-02-12 | 190.15 | 196.00 | 189.00 | 195.50 | +2.25% | 1,657,300 |
| 2026-02-11 | 188.35 | 192.00 | 187.20 | 191.20 | +1.17% | 996,900 |
| 2026-02-10 | 194.07 | 195.72 | 188.74 | 188.99 | -2.49% | 1,836,100 |
| 2026-02-09 | 199.83 | 201.00 | 191.88 | 193.81 | -3.66% | 2,096,200 |
| 2026-02-06 | 187.01 | 202.41 | 184.60 | 201.18 | +8.53% | 3,404,900 |
| 2026-02-05 | 184.87 | 187.73 | 184.54 | 185.36 | -0.05% | 2,542,600 |
| 2026-02-04 | 177.25 | 186.24 | 177.10 | 185.45 | +4.92% | 2,076,000 |
| 2026-02-03 | 177.79 | 182.67 | 176.19 | 176.76 | -1.30% | 1,594,100 |
| 2026-02-02 | 179.30 | 180.76 | 177.58 | 179.09 | -0.44% | 1,288,800 |
| 2026-01-30 | 177.09 | 180.14 | 175.96 | 179.89 | +2.11% | 1,488,000 |
| 2026-01-29 | 174.88 | 177.20 | 173.51 | 176.18 | +0.77% | 1,146,700 |
| 2026-01-28 | 173.63 | 175.06 | 170.85 | 174.83 | +0.41% | 1,304,500 |
| 2026-01-27 | 173.02 | 176.14 | 172.23 | 174.12 | +0.58% | 748,100 |
| 2026-01-26 | 171.67 | 174.31 | 170.59 | 173.12 | +0.89% | 1,049,200 |
| 2026-01-23 | 173.17 | 173.90 | 170.04 | 171.59 | -1.27% | 1,250,500 |
| 2026-01-22 | 171.78 | 175.29 | 171.65 | 173.80 | +0.68% | 996,400 |
| 2026-01-21 | 165.31 | 172.87 | 165.31 | 172.62 | +4.38% | 1,447,100 |
| 2026-01-20 | 161.51 | 165.61 | 160.36 | 165.38 | +0.58% | 1,879,900 |
| 2026-01-16 | 168.87 | 169.34 | 163.74 | 164.42 | -2.46% | 1,816,100 |
| 2026-01-15 | 169.03 | 169.79 | 166.79 | 168.57 | -0.44% | 1,562,600 |
| 2026-01-14 | 177.73 | 178.41 | 165.58 | 169.31 | -5.04% | 3,635,800 |
| 2026-01-13 | 185.42 | 186.32 | 177.05 | 178.30 | -3.95% | 1,597,400 |
| 2026-01-12 | 188.00 | 188.00 | 182.73 | 185.63 | -1.06% | 1,280,300 |
| 2026-01-09 | 186.74 | 190.20 | 186.49 | 187.62 | +0.87% | 1,416,700 |
| 2026-01-08 | 187.02 | 187.77 | 183.50 | 186.00 | -0.49% | 1,622,700 |
| 2026-01-07 | 181.70 | 187.06 | 181.70 | 186.91 | +2.35% | 2,122,400 |
| 2026-01-06 | 174.94 | 182.97 | 174.30 | 182.61 | +4.57% | 2,115,700 |
| 2026-01-05 | 175.73 | 180.56 | 171.61 | 174.63 | -1.79% | 1,663,600 |
| 2026-01-02 | 175.37 | 178.24 | 174.28 | 177.82 | +1.04% | 1,095,600 |
| 2025-12-31 | 175.76 | 177.19 | 175.02 | 175.99 | -0.23% | 890,400 |
| 2025-12-30 | 176.30 | 176.99 | 175.72 | 176.40 | -0.24% | 609,800 |
| 2025-12-29 | 177.00 | 178.46 | 176.31 | 176.83 | -0.14% | 928,100 |
| 2025-12-26 | 175.30 | 177.19 | 175.00 | 177.08 | +0.43% | 687,400 |
| 2025-12-24 | 175.73 | 177.18 | 175.37 | 176.33 | +0.86% | 434,700 |
| 2025-12-23 | 174.26 | 175.58 | 173.08 | 174.82 | +0.07% | 1,281,600 |
| 2025-12-22 | 174.78 | 177.29 | 172.90 | 174.70 | -0.06% | 1,909,500 |
| 2025-12-19 | 171.32 | 176.42 | 170.00 | 174.80 | +2.88% | 14,994,800 |
| 2025-12-18 | 171.59 | 173.00 | 168.56 | 169.91 | -1.27% | 2,761,000 |
| 2025-12-17 | 171.43 | 173.83 | 169.55 | 172.10 | +0.35% | 2,783,500 |
| 2025-12-16 | 174.51 | 174.51 | 169.52 | 171.50 | -2.41% | 2,408,300 |
| 2025-12-15 | 173.67 | 175.94 | 170.45 | 175.74 | +0.94% | 2,291,500 |
| 2025-12-12 | 173.49 | 175.08 | 171.27 | 174.10 | +0.93% | 1,781,500 |
| 2025-12-11 | 177.47 | 180.79 | 172.00 | 172.50 | -2.84% | 2,721,400 |
| 2025-12-10 | 173.30 | 178.17 | 169.24 | 177.55 | +0.97% | 2,147,900 |
| 2025-12-09 | 179.91 | 181.99 | 175.39 | 175.84 | -2.55% | 1,506,600 |
| 2025-12-08 | 181.30 | 182.12 | 179.21 | 180.44 | -0.47% | 1,474,200 |
| 2025-12-05 | 181.96 | 183.15 | 181.10 | 181.30 | -0.37% | 1,210,000 |
| 2025-12-04 | 181.86 | 182.69 | 179.27 | 181.98 | +0.68% | 1,246,300 |
| 2025-12-03 | 180.17 | 182.94 | 178.05 | 180.75 | +0.32% | 1,845,100 |
| 2025-12-02 | 177.32 | 180.55 | 174.53 | 180.18 | +1.35% | 1,866,300 |
| 2025-12-01 | 180.15 | 181.78 | 175.88 | 177.78 | -2.37% | 1,946,900 |
| 2025-11-28 | 182.07 | 182.74 | 180.69 | 182.09 | +0.08% | 566,400 |
| 2025-11-26 | 181.96 | 183.93 | 180.76 | 181.94 | -0.01% | 1,482,900 |
| 2025-11-25 | 177.07 | 182.97 | 176.09 | 181.96 | +2.91% | 2,344,500 |
| 2025-11-24 | 177.65 | 185.17 | 175.57 | 176.82 | +0.87% | 4,164,200 |
| 2025-11-21 | 168.54 | 176.02 | 167.42 | 175.30 | +4.23% | 2,268,000 |
| 2025-11-20 | 168.15 | 170.91 | 165.75 | 168.18 | +0.15% | 1,914,500 |
| 2025-11-19 | 168.83 | 168.90 | 165.79 | 167.93 | -0.53% | 1,766,000 |
| 2025-11-18 | 164.40 | 170.78 | 163.00 | 168.83 | +2.52% | 2,257,400 |
| 2025-11-17 | 167.00 | 167.97 | 163.50 | 164.68 | -1.71% | 2,244,600 |
| 2025-11-14 | 164.72 | 169.00 | 163.00 | 167.55 | +1.71% | 2,620,400 |
| 2025-11-13 | 161.57 | 167.87 | 161.20 | 164.73 | +2.01% | 2,993,000 |
| 2025-11-12 | 160.00 | 162.56 | 158.05 | 161.48 | +1.20% | 1,659,700 |
| 2025-11-11 | 156.76 | 159.95 | 154.20 | 159.56 | +2.11% | 1,504,500 |
| 2025-11-10 | 155.41 | 156.55 | 153.77 | 156.26 | +0.48% | 1,258,600 |
| 2025-11-07 | 156.70 | 156.70 | 151.83 | 155.51 | -0.78% | 1,552,000 |
| 2025-11-06 | 155.76 | 157.80 | 153.76 | 156.74 | +2.16% | 1,848,500 |
| 2025-11-05 | 149.66 | 153.68 | 148.51 | 153.43 | +2.75% | 1,806,000 |
| 2025-11-04 | 150.89 | 152.90 | 149.05 | 149.33 | -1.39% | 2,028,900 |
| 2025-11-03 | 153.60 | 155.33 | 149.63 | 151.44 | -1.83% | 2,197,200 |
| 2025-10-31 | 147.99 | 155.18 | 146.52 | 154.27 | +3.11% | 2,235,300 |
| 2025-10-30 | 140.10 | 154.44 | 138.00 | 149.61 | +1.18% | 2,745,200 |
| 2025-10-29 | 148.82 | 149.91 | 147.54 | 147.86 | -0.85% | 2,450,700 |
| 2025-10-28 | 150.01 | 150.30 | 148.37 | 149.13 | -0.86% | 1,662,800 |
| 2025-10-27 | 150.07 | 150.92 | 148.10 | 150.43 | +0.36% | 1,214,300 |
| 2025-10-24 | 151.09 | 151.92 | 148.98 | 149.89 | -0.13% | 1,338,300 |
| 2025-10-23 | 148.99 | 150.29 | 147.57 | 150.08 | +1.60% | 1,246,000 |
| 2025-10-22 | 147.37 | 149.12 | 146.25 | 147.72 | +1.03% | 1,403,100 |
| 2025-10-21 | 146.09 | 147.89 | 144.29 | 146.22 | -0.28% | 895,000 |
| 2025-10-20 | 143.31 | 147.47 | 142.41 | 146.63 | +2.54% | 1,316,200 |
| 2025-10-17 | 142.10 | 144.32 | 141.67 | 143.00 | +0.52% | 1,010,000 |
| 2025-10-16 | 144.05 | 147.48 | 141.70 | 142.26 | -0.97% | 1,469,100 |
| 2025-10-15 | 144.74 | 145.19 | 142.29 | 143.66 | -1.14% | 1,337,200 |
| 2025-10-14 | 144.09 | 146.88 | 142.20 | 145.31 | +0.43% | 1,283,400 |
| 2025-10-13 | 146.47 | 147.56 | 144.65 | 144.69 | -1.28% | 1,124,300 |
| 2025-10-10 | 150.00 | 150.20 | 144.74 | 146.57 | -2.03% | 1,725,000 |
| 2025-10-09 | 151.37 | 152.15 | 148.17 | 149.61 | -0.90% | 1,600,400 |
| 2025-10-08 | 152.36 | 152.36 | 149.64 | 150.97 | -0.81% | 1,333,300 |
| 2025-10-07 | 154.52 | 154.57 | 151.97 | 152.21 | -1.19% | 1,372,500 |
| 2025-10-06 | 159.60 | 159.70 | 153.10 | 154.05 | -3.65% | 1,817,900 |
| 2025-10-03 | 156.46 | 160.20 | 155.97 | 159.88 | +2.98% | 2,878,800 |
| 2025-10-02 | 154.00 | 157.85 | 152.22 | 155.25 | +0.67% | 2,882,300 |
| 2025-10-01 | 140.82 | 154.44 | 140.70 | 154.22 | +10.09% | 4,059,900 |
| 2025-09-30 | 138.46 | 141.04 | 136.94 | 140.08 | +1.13% | 1,368,900 |
| 2025-09-29 | 137.49 | 138.80 | 135.39 | 138.52 | +0.84% | 1,285,500 |
| 2025-09-26 | 136.79 | 138.00 | 135.81 | 137.37 | +1.25% | 1,677,100 |
| 2025-09-25 | 138.40 | 140.67 | 135.41 | 135.67 | -1.45% | 1,260,300 |
| 2025-09-24 | 138.52 | 139.28 | 136.20 | 137.67 | -1.18% | 1,309,100 |
| 2025-09-23 | 140.27 | 141.38 | 138.73 | 139.31 | -0.96% | 1,102,800 |
| 2025-09-22 | 142.12 | 142.64 | 140.02 | 140.66 | -1.29% | 1,445,800 |
| 2025-09-19 | 143.96 | 144.43 | 141.49 | 142.50 | -0.91% | 3,748,500 |
| 2025-09-18 | 146.30 | 146.45 | 143.37 | 143.81 | -0.73% | 1,514,400 |
| 2025-09-17 | 143.48 | 146.68 | 143.39 | 144.87 | +0.83% | 1,501,900 |
| 2025-09-16 | 143.51 | 147.23 | 143.02 | 143.68 | +0.25% | 1,935,800 |
| 2025-09-15 | 144.82 | 145.99 | 141.12 | 143.32 | -1.06% | 1,432,300 |
| 2025-09-12 | 148.08 | 150.28 | 144.84 | 144.86 | -2.67% | 1,810,700 |
| 2025-09-11 | 143.47 | 149.07 | 142.86 | 148.84 | +4.37% | 1,714,600 |
| 2025-09-10 | 143.00 | 143.45 | 139.54 | 142.61 | -0.69% | 1,278,800 |
| 2025-09-09 | 141.16 | 143.74 | 140.51 | 143.60 | +1.59% | 1,490,700 |
| 2025-09-08 | 140.00 | 143.23 | 137.20 | 141.35 | +0.48% | 1,624,300 |
| 2025-09-05 | 140.13 | 144.20 | 139.96 | 140.67 | +0.52% | 1,561,800 |
| 2025-09-04 | 141.78 | 142.28 | 137.14 | 139.94 | -1.19% | 1,529,000 |
| 2025-09-03 | 139.56 | 145.27 | 139.56 | 141.62 | +1.43% | 2,279,400 |
| 2025-09-02 | 133.55 | 140.06 | 133.53 | 139.63 | +5.60% | 2,466,900 |
| 2025-08-29 | 132.50 | 133.48 | 131.52 | 132.22 | -0.32% | 1,083,000 |
| 2025-08-28 | 136.36 | 136.36 | 132.04 | 132.65 | -2.72% | 1,557,800 |
| 2025-08-27 | 136.00 | 138.50 | 135.79 | 136.36 | -0.26% | 1,403,100 |
| 2025-08-26 | 135.85 | 136.91 | 135.22 | 136.72 | +0.26% | 1,579,900 |
| 2025-08-25 | 139.01 | 139.75 | 136.14 | 136.36 | -2.12% | 861,800 |
| 2025-08-22 | 140.41 | 142.32 | 138.65 | 139.31 | +0.14% | 1,198,900 |
| 2025-08-21 | 138.26 | 140.20 | 137.59 | 139.12 | +0.09% | 1,074,100 |
| 2025-08-20 | 139.10 | 140.50 | 137.77 | 138.99 | +0.09% | 1,286,300 |
| 2025-08-19 | 136.37 | 139.58 | 136.02 | 138.86 | +2.17% | 1,447,800 |
| 2025-08-18 | 140.00 | 141.18 | 135.74 | 135.91 | -1.94% | 1,813,900 |
| 2025-08-15 | 136.16 | 138.83 | 135.88 | 138.60 | +2.71% | 1,643,800 |
| 2025-08-14 | 134.51 | 135.23 | 132.16 | 134.94 | -0.18% | 1,169,800 |
| 2025-08-13 | 129.62 | 135.38 | 129.40 | 135.19 | +4.86% | 1,549,000 |
| 2025-08-12 | 128.47 | 131.10 | 128.25 | 128.93 | +0.73% | 1,127,600 |
| 2025-08-11 | 131.16 | 133.73 | 127.71 | 128.00 | -2.04% | 1,070,300 |
Most recent 250 sessions, newest first.
Seasonal returns
Best month historically: Nov (+4.83%). Worst month: Jul (-4.55%). Based on 5 years of daily data (2022–2026).
FAQ · from the current price data · as of 2026-08-07
Quick answers
What is Biogen Inc's (BIIB) latest close?
207.94 on 2026-08-07, from the Closelook data lake's daily price record.
What is BIIB's 52-week high and low?
219.72 high and 127.00 low over the trailing 52 weeks, as of 2026-08-07.
What is Biogen Inc's strongest and weakest month historically?
Historically, BIIB's strongest calendar month has been Nov (average +4.83%) and its weakest Jul (average -4.55%), based on 5 years of daily data (2022–2026).
How many years of seasonality does this cover?
5 years (2022–2026), computed from 965 daily bars in the Closelook data lake.