BIIB Monthly Statistics
BIIB monthly stock returns with historical performance by month, return charts, and downloadable statistics.
Biogen Inc. Common Stock (BIIB) company overview
Biogen is an established biopharmaceutical company focused on treatments for neurodegenerative and rare diseases. Its declining multiple sclerosis franchise is its largest revenue generator and contributed 40% of total revenue in 2025. Biogen also generates significant revenue from its CD20 collaboration agreements with Roche (19% of total in 2025), which includes oncology drugs Rituxan and Gazyva and multiple sclerosis drug Ocrevus. Biogen's newer franchises include Spinraza (spinal muscular atrophy, with partner Ionis), Leqembi (Alzheimer's disease, collabroation revenue from its partner Eisai), Skyclarys (Friedreich's ataxia, Reata), Zurzuvae (postpartum depression, Sage), and Qalsody (amyotrophic lateral sclerosis, Ionis).
| Period | Return % |
|---|---|
| 2000-01 | 35.33 |
| 2000-02 | 11.65 |
| 2000-03 | -30.26 |
| 2000-04 | -34.87 |
| 2000-05 | -0.28 |
| 2000-06 | 83.83 |
| 2000-07 | 4.71 |
| 2000-08 | 13.68 |
| 2000-09 | 25.59 |
| 2000-10 | 11.86 |
| 2000-11 | -11.26 |
| 2000-12 | 8.91 |
| 2001-01 | -6.93 |
| 2001-02 | -4.13 |
| 2001-03 | -29.05 |
| 2001-04 | 23 |
| 2001-05 | 25.2 |
| 2001-06 | 9.89 |
| 2001-07 | -20.25 |
| 2001-08 | 9.8 |
| 2001-09 | -16.37 |
| 2001-10 | 21 |
| 2001-11 | 17.21 |
| 2001-12 | -1.95 |
| 2002-01 | -13.74 |
| 2002-02 | 5.65 |
| 2002-03 | 2.36 |
| 2002-04 | -14.54 |
| 2002-05 | -21.95 |
| 2002-06 | -17.35 |
| 2002-07 | 25.78 |
| 2002-08 | -9.89 |
| 2002-09 | 3.33 |
| 2002-10 | 10.84 |
| 2002-11 | -28.7 |
| 2002-12 | 1.1 |
| 2003-01 | -3.29 |
| 2003-02 | -10.38 |
| 2003-03 | 19.03 |
| 2003-04 | -4.3 |
| 2003-05 | 16.7 |
| 2003-06 | -11.15 |
| 2003-07 | -0.59 |
| 2003-08 | 2.84 |
| 2003-09 | -4.12 |
| 2003-10 | 5.56 |
| 2003-11 | 8.65 |
| 2003-12 | -3.88 |
| 2004-01 | 17.11 |
| 2004-02 | 29.01 |
| 2004-03 | 0.27 |
| 2004-04 | 6.12 |
| 2004-05 | 5.34 |
| 2004-06 | 1.77 |
| 2004-07 | -5.14 |
| 2004-08 | -1.12 |
| 2004-09 | 3.1 |
| 2004-10 | -4.92 |
| 2004-11 | 0.89 |
| 2004-12 | 13.51 |
| 2005-01 | -2.48 |
| 2005-02 | -40.5 |
| 2005-03 | -10.71 |
| 2005-04 | 5.01 |
| 2005-05 | 7.89 |
| 2005-06 | -11.89 |
| 2005-07 | 14.05 |
| 2005-08 | 7.25 |
| 2005-09 | -6.31 |
| 2005-10 | 2.91 |
| 2005-11 | 5.37 |
| 2005-12 | 5.77 |
| 2006-01 | -1.17 |
| 2006-02 | 5.59 |
| 2006-03 | -0.32 |
| 2006-04 | -4.78 |
| 2006-05 | 3.97 |
| 2006-06 | -0.66 |
| 2006-07 | -9.22 |
| 2006-08 | 5.11 |
| 2006-09 | 1.09 |
| 2006-10 | 6.54 |
| 2006-11 | 9.79 |
| 2006-12 | -5.87 |
| 2007-01 | -1.73 |
| 2007-02 | -6.52 |
| 2007-03 | -1.79 |
| 2007-04 | 6.38 |
| 2007-05 | 10.61 |
| 2007-06 | 2.45 |
| 2007-07 | 5.68 |
| 2007-08 | 12.88 |
| 2007-09 | 3.93 |
| 2007-10 | 12.23 |
| 2007-11 | -0.43 |
| 2007-12 | -23.21 |
| 2008-01 | 7.08 |
| 2008-02 | -4.25 |
| 2008-03 | 5.71 |
| 2008-04 | -1.62 |
| 2008-05 | 3.39 |
| 2008-06 | -10.93 |
| 2008-07 | 24.82 |
| 2008-08 | -26.99 |
| 2008-09 | -1.26 |
| 2008-10 | -15.39 |
| 2008-11 | -0.56 |
| 2008-12 | 12.57 |
| 2009-01 | 2.14 |
| 2009-02 | -5.36 |
| 2009-03 | 13.86 |
| 2009-04 | -7.78 |
| 2009-05 | 7.14 |
| 2009-06 | -12.82 |
| 2009-07 | 5.32 |
| 2009-08 | 5.57 |
| 2009-09 | 0.64 |
| 2009-10 | -16.61 |
| 2009-11 | 11.42 |
| 2009-12 | 13.98 |
| Date | Open | High | Low | Close | Volume |
|---|---|---|---|---|---|
| 2026-10-09 | 220.62 | 227.2 | 219.23 | 225.71 | — |
| 2026-10-08 | 220.3 | 223.09 | 215.73 | 218.43 | — |
| 2026-10-07 | 222.93 | 228 | 221.4 | 222.15 | — |
| 2026-10-06 | 224.53 | 225.97 | 218 | 222.89 | — |
| 2026-10-05 | 220 | 223.85 | 218.22 | 223.59 | — |
| 2026-10-02 | 222.98 | 224.08 | 219.84 | 219.88 | — |
| 2026-10-01 | 225.5 | 228.31 | 222.5 | 222.82 | — |
| 2026-09-30 | 227.23 | 229.36 | 225.51 | 225.88 | — |
| 2026-09-29 | 227.02 | 229.41 | 224.45 | 227.07 | — |
| 2026-09-28 | 225.87 | 230.49 | 225.51 | 228.69 | — |
| 2026-09-25 | 228.27 | 228.92 | 223.76 | 227.6 | — |
| 2026-09-24 | 226.8 | 228.72 | 224.3 | 226.36 | — |
| 2026-09-23 | 226.94 | 229.01 | 222.35 | 227.53 | — |
| 2026-09-21 | 216.14 | 221.92 | 214.59 | 219.07 | — |
| 2026-09-18 | 219.05 | 220.17 | 215.26 | 215.5 | — |
| 2026-09-17 | 217.68 | 219.41 | 215.33 | 219.05 | — |
| 2026-09-16 | 216.41 | 218.29 | 214.81 | 216.01 | — |
| 2026-09-15 | 216.71 | 216.71 | 213.54 | 216.17 | — |
| 2026-09-14 | 221 | 222.24 | 215.56 | 217.36 | — |
| 2026-09-11 | 216.75 | 219.74 | 214.71 | 217.15 | — |
| 2026-09-10 | 209.92 | 216.7 | 208.93 | 215.43 | — |
| 2026-09-09 | 210.5 | 213.48 | 209 | 210.73 | — |
| 2026-09-08 | 215.45 | 217.28 | 210.54 | 212.5 | — |
| 2026-09-04 | 221.15 | 223.78 | 219.82 | 220.83 | — |
| 2026-09-02 | 218.2 | 225.59 | 216.97 | 222.67 | — |
| 2026-09-01 | 218.11 | 219.3 | 213.6 | 216.04 | — |
| 2026-08-31 | 216.47 | 218.88 | 213.58 | 216.65 | — |
| 2026-08-27 | 219.39 | 222.11 | 217.53 | 221.5 | — |
| 2026-08-26 | 219.34 | 222 | 218.69 | 221.07 | — |
| 2026-08-25 | 218.93 | 222.85 | 218 | 220.77 | — |
| 2026-08-24 | 216.4 | 218.5 | 213.96 | 218.12 | — |
| 2026-08-21 | 217.76 | 219.12 | 215 | 216.78 | — |
| 2026-08-20 | 217.98 | 221.29 | 214.19 | 214.35 | — |
| 2026-08-19 | 215.35 | 222.15 | 215.07 | 221.56 | — |
| 2026-08-18 | 211 | 214.07 | 210.07 | 212.55 | — |
| 2026-08-17 | 208.34 | 210.47 | 207.62 | 209.15 | — |
| 2026-08-14 | 210.01 | 210.78 | 208.22 | 209.83 | — |
| 2026-08-13 | 212.98 | 215.6 | 208.81 | 210.65 | — |
| 2026-08-12 | 203.52 | 209.22 | 201 | 208.87 | — |
| 2026-08-11 | 206.5 | 207.57 | 203.53 | 203.89 | — |
| 2026-08-10 | 206.7 | 210.02 | 206.29 | 207.13 | — |
| 2026-08-07 | 207.38 | 208.31 | 204.16 | 207.94 | — |
| 2026-08-06 | 208.17 | 209.03 | 202.03 | 206.28 | — |
| 2026-08-05 | 210.6 | 212.18 | 205.8 | 206.63 | — |
| 2026-08-04 | 200.6 | 209.74 | 199.93 | 208.45 | — |
| 2026-08-03 | 203.34 | 203.85 | 199.58 | 201.82 | — |
| 2026-07-31 | 207.31 | 208.05 | 202.57 | 202.95 | — |
| 2026-07-30 | 204.38 | 210.18 | 203.09 | 207.93 | — |
| 2026-07-29 | 210.84 | 218.53 | 206.26 | 209.23 | — |
| 2026-07-28 | 201.01 | 207.72 | 199.4 | 205.61 | — |
| 2026-07-27 | 202.75 | 204.47 | 199.83 | 200.14 | — |
| 2026-07-24 | 202.24 | 203.3 | 200.04 | 202.19 | — |
| 2026-07-23 | 197.04 | 203.51 | 196.91 | 200.62 | — |
| 2026-07-22 | 203.7 | 204.3 | 197.4 | 197.74 | — |
| 2026-07-21 | 199.47 | 203.7 | 198.59 | 203.16 | — |
| 2026-07-20 | 204.08 | 205.65 | 199.62 | 199.95 | — |
| 2026-07-17 | 209.01 | 215.67 | 203.46 | 205.99 | — |
| 2026-07-16 | 198.26 | 209.64 | 194.67 | 208.92 | — |
| 2026-07-15 | 191.21 | 198.58 | 186.02 | 197.24 | — |
| 2026-07-14 | 200.34 | 201.9 | 189.4 | 191.95 | — |
| 2026-07-13 | 199.33 | 210.87 | 197.74 | 209.03 | — |
| 2026-07-10 | 197.63 | 199.98 | 194.37 | 199.15 | — |
| 2026-07-09 | 198.92 | 201 | 196 | 198.91 | — |
| 2026-07-08 | 204.86 | 206.75 | 198.93 | 200.36 | — |
| 2026-07-07 | 211.86 | 212 | 205.65 | 205.7 | — |
| 2026-07-06 | 215.95 | 215.95 | 208.27 | 208.46 | — |
| 2026-07-02 | 212.53 | 219 | 210.75 | 216.12 | — |
| 2026-07-01 | 215.25 | 215.76 | 209.67 | 209.74 | — |
| 2026-06-30 | 218 | 218 | 212.58 | 216.06 | — |
| 2026-06-29 | 215.01 | 219.72 | 214.08 | 216.63 | — |
| 2026-06-26 | 202.99 | 218.06 | 202.29 | 216.03 | — |
| 2026-06-25 | 201.63 | 206.66 | 200.2 | 201.96 | — |
| 2026-06-24 | 199.34 | 202.06 | 198.66 | 199.59 | — |
| 2026-06-23 | 198.87 | 201.22 | 197.01 | 197.19 | — |
| 2026-06-22 | 199.48 | 200.98 | 194.74 | 199.71 | — |
| 2026-06-18 | 200.22 | 200.99 | 193.2 | 196.58 | — |
| 2026-06-17 | 195.14 | 201.75 | 194.04 | 198.67 | — |
| 2026-06-16 | 199.69 | 200.26 | 194.04 | 195.61 | — |
| 2026-06-15 | 199.09 | 199.37 | 195.89 | 198.64 | — |
| 2026-06-12 | 201.29 | 203.45 | 199.06 | 200.05 | — |
| 2026-06-11 | 195.49 | 201.18 | 194.24 | 199.96 | — |
| 2026-06-10 | 200.12 | 201.94 | 194.1 | 194.24 | — |
| 2026-06-09 | 195.51 | 199.63 | 193.48 | 199.1 | — |
| 2026-06-05 | 196.45 | 200.66 | 195.14 | 195.34 | — |
| 2026-06-04 | 198 | 199.9 | 196.35 | 196.45 | — |
| 2026-06-03 | 187.69 | 196.36 | 187.48 | 195.96 | — |
| 2026-06-02 | 190 | 190.58 | 184.96 | 188.83 | — |
| 2026-06-01 | 194.5 | 195.28 | 191.67 | 192.23 | — |
| 2026-05-29 | 195.55 | 198.46 | 195.18 | 196 | — |
| 2026-05-28 | 196.97 | 198 | 194.5 | 196.39 | — |
| 2026-05-27 | 194.11 | 199.72 | 194.11 | 196.97 | — |
| 2026-05-22 | 190.53 | 194.75 | 190.01 | 193.76 | — |
| 2026-05-21 | 187.4 | 190.27 | 185.85 | 189.47 | — |
| 2026-05-20 | 191.41 | 193.38 | 186.37 | 187.8 | — |
| 2026-05-19 | 191.65 | 193.03 | 188.64 | 190.56 | — |
| 2026-05-18 | 191.25 | 193.37 | 189.19 | 191.91 | — |
| 2026-05-15 | 191.83 | 194.88 | 190.72 | 192.95 | — |
| 2026-05-14 | 200.25 | 205 | 189.49 | 191.37 | — |
| 2026-05-13 | 199.33 | 205.97 | 198.9 | 204.53 | — |
| 2026-05-12 | 198.45 | 202.4 | 196.47 | 199.36 | — |
| 2026-05-11 | 194.76 | 200.31 | 194.75 | 197.95 | — |
| 2026-05-08 | 189.68 | 195.2 | 189.5 | 193.45 | — |
| 2026-05-07 | 190.34 | 192.1 | 188.86 | 191.38 | — |
| 2026-05-06 | 189.13 | 191.16 | 188.3 | 190.68 | — |
| 2026-05-05 | 187.38 | 189.69 | 186 | 189.13 | — |
| 2026-05-04 | 186.28 | 187.51 | 185.44 | 187.21 | — |
| 2026-05-01 | 189.28 | 190.57 | 186.17 | 187.06 | — |
| 2026-04-30 | 194.04 | 195.98 | 187.16 | 189.28 | — |
| 2026-04-29 | 183.12 | 195.89 | 180.18 | 194.38 | — |
| 2026-04-28 | 182.45 | 184.41 | 181.89 | 183.38 | — |
| 2026-04-27 | 183.16 | 186.15 | 179.15 | 180.67 | — |
| 2026-04-24 | 186.65 | 186.65 | 183.17 | 184.38 | — |
| 2026-04-23 | 189.46 | 190.32 | 187.01 | 187.88 | — |
| 2026-04-22 | 188.81 | 192.75 | 188.71 | 190.07 | — |
| 2026-04-21 | 184.52 | 187.74 | 181.75 | 185.95 | — |
| 2026-04-20 | 179.54 | 184.26 | 178.94 | 183.34 | — |
| 2026-04-17 | 176.29 | 178.4 | 175.69 | 177.35 | — |
| 2026-04-16 | 178.68 | 179.5 | 174.85 | 176.02 | — |
| 2026-04-15 | 179.36 | 180.87 | 177.7 | 180.54 | — |
| 2026-04-14 | 177.71 | 181.77 | 177.45 | 178.96 | — |