Current Count
148.7M
Financial Fundamentals
BIIB • Quarterly Data • 5Y View
Share Count History
| Date | Shares Out. (M) | Change (M) | Change % |
|---|---|---|---|
| 2026-06-30 | 148.7 | 0.3 | +0.20% |
| 2026-03-31 | 148.4 | 1.7 | +1.16% |
| 2025-12-31 | 146.7 | -0.4 | -0.27% |
| 2025-09-30 | 147.1 | 1.2 | +0.82% |
| 2025-06-30 | 145.9 | 0.0 | 0.00% |
| 2025-03-31 | 145.9 | -0.2 | -0.14% |
| 2024-12-31 | 146.1 | 0.2 | +0.14% |
| 2024-09-30 | 145.9 | 0.0 | 0.00% |
| 2024-06-30 | 145.9 | 0.0 | 0.00% |
| 2024-03-31 | 145.9 | 0.2 | +0.14% |
| 2023-12-31 | 145.7 | 0.9 | +0.62% |
| 2023-09-30 | 144.8 | -0.7 | -0.48% |
| 2023-06-30 | 145.5 | 0.3 | +0.21% |
| 2023-03-31 | 145.2 | 0.0 | 0.00% |
| 2022-12-31 | 145.2 | 0.4 | +0.28% |
| 2022-09-30 | 144.8 | -1.4 | -0.96% |
| 2022-06-30 | 146.2 | -1.4 | -0.95% |
| 2022-03-31 | 147.6 | 0.1 | +0.07% |
| 2021-12-31 | 147.5 | -1.1 | -0.74% |
| 2021-09-30 | 148.6 | -1.5 | -1.00% |
| 2021-06-30 | 150.1 | -2.2 | -1.44% |
| 2021-03-31 | 152.3 | -1.7 | -1.10% |
| 2020-12-31 | 154.0 | -3.2 | -2.04% |
| 2020-09-30 | 157.2 | -3.7 | -2.30% |
| 2020-06-30 | 160.9 | -12.2 | -7.05% |
| 2020-03-31 | 173.1 | -5.1 | -2.86% |
| 2019-12-31 | 178.2 | -6.0 | -3.26% |
| 2019-09-30 | 184.2 | -6.2 | -3.26% |
| 2019-06-30 | 190.4 | -6.6 | -3.35% |
| 2019-03-31 | 197.0 | -3.3 | -1.65% |
| 2018-12-31 | 200.3 | -1.6 | -0.79% |
| 2018-09-30 | 201.9 | -5.4 | -2.60% |
| 2018-06-30 | 207.3 | -4.4 | -2.08% |
| 2018-03-31 | 211.7 | -0.3 | -0.14% |
| 2017-12-31 | 212.0 | 0.2 | +0.09% |
| 2017-09-30 | 211.8 | -0.4 | -0.19% |
| 2017-06-30 | 212.2 | -3.7 | -1.71% |
| 2017-03-31 | 215.9 | -1.1 | -0.51% |
| 2016-12-31 | 217.0 | -2.4 | -1.09% |
| 2016-09-30 | 219.4 | 0.0 | 0.00% |
| 2016-06-30 | 219.4 | 0.1 | +0.05% |
| 2016-03-31 | 219.3 | -1.5 | -0.68% |
| 2015-12-31 | 220.8 | -11.8 | -5.07% |
| 2015-09-30 | 232.6 | -3.1 | -1.32% |
| 2015-06-30 | 235.7 | 0.1 | +0.03% |
| 2015-03-31 | 235.6 | -0.7 | -0.28% |
| 2014-12-31 | 236.3 | -0.7 | -0.29% |
| 2014-09-30 | 237.0 | -0.4 | -0.18% |
| 2014-06-30 | 237.4 | -0.4 | -0.19% |
| 2014-03-31 | 237.8 | 0.2 | +0.09% |
| 2013-12-31 | 237.6 | -0.7 | -0.30% |
| 2013-09-30 | 238.3 | -0.4 | -0.17% |
| 2013-06-30 | 238.7 | 0.4 | +0.18% |
| 2013-03-31 | 238.3 | -0.0 | -0.01% |
| 2012-12-31 | 238.3 | 0.2 | +0.08% |
| 2012-09-30 | 238.1 | -2.5 | -1.04% |
| 2012-06-30 | 240.6 | -1.2 | -0.50% |
| 2012-03-31 | 241.8 | -3.6 | -1.45% |
| 2011-12-31 | 245.4 | 0.0 | +0.01% |
| 2011-09-30 | 245.4 | 0.4 | +0.16% |
| 2011-06-30 | 245.0 | 0.4 | +0.17% |
| 2011-03-31 | 244.6 | 0.0 | 0.00% |
| 2010-12-31 | 244.6 | 2.2 | +0.92% |
| 2010-09-30 | 242.3 | -19.3 | -7.39% |
| 2010-06-30 | 261.7 | -11.0 | -4.05% |
| 2010-03-31 | 272.7 | 0.0 | 0.00% |
| 2009-12-31 | 272.7 | -18.3 | -6.30% |
| 2009-09-30 | 291.0 | 0.7 | +0.23% |
| 2009-06-30 | 290.4 | 0.6 | +0.21% |
| 2009-03-31 | 289.7 | 0.0 | 0.00% |
| 2008-12-31 | 289.7 | -4.2 | -1.42% |
| 2008-09-30 | 293.9 | 0.4 | +0.15% |
| 2008-06-30 | 293.5 | -6.0 | -2.01% |
| 2008-03-31 | 299.5 | 0.0 | 0.00% |
| 2007-12-31 | 299.5 | 6.1 | +2.08% |
| 2007-09-30 | 293.4 | -50.0 | -14.56% |
| 2007-06-30 | 343.4 | -0.7 | -0.19% |
| 2007-03-31 | 344.1 | 0.0 | 0.00% |
| 2006-12-31 | 344.1 | -0.7 | -0.20% |
| 2006-09-30 | 344.8 | 2.4 | +0.69% |
| 2006-06-30 | 342.4 | -3.4 | -0.99% |
| 2006-03-31 | 345.8 | 0.0 | 0.00% |
| 2005-12-31 | 345.8 | 5.0 | +1.45% |
| 2005-09-30 | 340.9 | -3.9 | -1.12% |
| 2005-06-30 | 344.7 | -7.4 | -2.11% |
| 2005-03-31 | 352.2 | 0.0 | 0.00% |
| 2004-12-31 | 352.2 | -3.1 | -0.86% |
| 2004-09-30 | 355.2 | 5.0 | +1.41% |
| 2004-06-30 | 350.3 | 16.6 | +4.97% |
| 2004-03-31 | 333.7 | 0.0 | 0.00% |
| 2003-12-31 | 333.7 | -65.1 | -16.31% |
| 2003-09-30 | 398.8 | 0.0 | 0.00% |
| 2003-06-30 | 398.8 | 0.0 | 0.00% |
| 2003-03-31 | 398.8 | 0.0 | 0.00% |
| 2002-12-31 | 398.8 | 0.0 | 0.00% |
| 2002-09-30 | 398.8 | 0.0 | 0.00% |
| 2002-06-30 | 398.8 | 0.0 | 0.00% |
| 2002-03-31 | 398.8 | 0.0 | 0.00% |
| 2001-12-31 | 398.8 | 0.0 | 0.00% |
| 2001-09-30 | 398.8 | 0.0 | 0.00% |
| 2001-06-30 | 398.8 | 0.0 | 0.00% |
| 2001-03-31 | 398.8 | -63.7 | -13.77% |
| 2000-12-31 | 462.5 | 1.4 | +0.29% |
| 2000-09-30 | 461.1 | -1.3 | -0.29% |
| 2000-06-30 | 462.5 | -10.7 | -2.26% |
| 2000-03-31 | 473.1 | 0.0 | 0.00% |
| 1999-12-31 | 473.1 | -480.7 | -50.40% |
| 1999-09-30 | 953.8 | 23.8 | +2.56% |
| 1999-06-30 | 930.0 | -15.5 | -1.64% |
| 1999-03-31 | 945.5 | 0.0 | 0.00% |
| 1998-12-31 | 945.5 | 43.1 | +4.78% |
| 1998-09-30 | 902.4 | -39.6 | -4.20% |
| 1998-06-30 | 942.0 | 15.3 | +1.65% |
| 1998-03-31 | 926.7 | 0.0 | 0.00% |
| 1997-12-31 | 926.7 | 48.1 | +5.47% |
| 1997-09-30 | 878.6 | -39.9 | -4.34% |
| 1997-06-30 | 918.5 | -8.8 | -0.95% |
| 1997-03-31 | 927.3 | 0.0 | 0.00% |
| 1996-12-31 | 927.3 | 25.3 | +2.80% |
| 1996-09-30 | 902.0 | — | — |