Biogen Inc. (BIIB)
NASDAQ: BIIB
· Real-Time Price · USD
121.00
-0.08 (-0.07%)
At close: May 01, 2025, 3:59 PM
121.59
0.49%
After-hours: May 01, 2025, 07:56 PM EDT
Biogen Short Interest
Biogen has a total short interest of 3.45M. Its short interest has increased by 3.07% to the previous Month.
Short Interest
3.45M
Short Prior Month
3.34M
% Change MoM
3.07%
Short % Floating
2.65%
Short % Outstanding
2.35%
Days to Cover
1.68
Short Interest Chart
Short Interest History
| Date | Short Interest | Short Prior Month | % Change | Day to Cover | Short % Float | Short % Out |
|---|---|---|---|---|---|---|
| Apr 25, 2025 | 3.45M | 3.34M | 3.07% | 1.68 | 2.65% | 2.35% |
| Apr 09, 2025 | 3.34M | 3.31M | 1.01% | 2.09 | 2.58% | 2.28% |
| Mar 25, 2025 | 3.31M | 3.72M | -11.01% | 1.73 | 2.55% | 2.26% |
| Mar 11, 2025 | 3.72M | 3.88M | -4.22% | 2.3 | 2.87% | 2.54% |
| Feb 26, 2025 | 3.88M | 3.74M | 3.81% | 2.35 | 2.99% | 2.65% |
| Feb 11, 2025 | 3.74M | 3.77M | -0.76% | 2.91 | 2.9% | 2.57% |
| Jan 27, 2025 | 3.77M | 3.68M | 2.53% | 3.01 | 2.92% | 2.59% |
| Jan 10, 2025 | 3.68M | 2.58M | 42.68% | 2.2 | 2.85% | 2.52% |
| Dec 24, 2024 | 2.58M | 2.72M | -5.37% | 1.94 | 2% | 1.77% |
| Dec 10, 2024 | 2.72M | 2.7M | 1.02% | 1.76 | 2.11% | 1.87% |
| Nov 26, 2024 | 2.7M | 3.12M | -13.62% | 1.46 | 2.09% | 1.85% |
| Nov 11, 2024 | 3.12M | 3.07M | 1.74% | 2.52 | 2.42% | 2.14% |
| Oct 24, 2024 | 3.07M | 2.85M | 7.66% | 2.17 | 2.38% | 2.11% |
| Oct 09, 2024 | 2.85M | 3.67M | -22.32% | 2.24 | 2.21% | 1.96% |
| Sep 24, 2024 | 3.67M | 3.34M | 9.89% | 4.28 | 2.84% | 2.52% |
| Sep 11, 2024 | 3.34M | 2.68M | 24.6% | 4.83 | 2.59% | 2.29% |
| Aug 26, 2024 | 2.68M | 2.73M | -2.05% | 2.52 | 2.07% | 1.84% |
| Aug 09, 2024 | 2.73M | 3.63M | -24.6% | 2.36 | 2.12% | 1.88% |
| Jul 24, 2024 | 3.63M | 2.74M | 32.27% | 4.69 | 2.81% | 2.49% |
| Jul 10, 2024 | 2.74M | 3.07M | -10.63% | 2.2 | 2.13% | 1.88% |
| Jun 26, 2024 | 3.07M | 3.02M | 1.67% | 3.24 | 2.38% | 2.11% |
| Jun 11, 2024 | 3.02M | 3.48M | -13.18% | 3.1 | 2.34% | 2.07% |
| May 24, 2024 | 3.48M | 3.15M | 10.42% | 3.34 | 2.69% | 2.39% |
| May 09, 2024 | 3.15M | 3.26M | -3.56% | 1.97 | 2.44% | 2.16% |
| Apr 24, 2024 | 3.26M | 3.55M | -8.12% | 3.33 | 2.53% | 2.24% |
| Apr 09, 2024 | 3.55M | 2.66M | 33.61% | 2.85 | 2.76% | 2.44% |
| Mar 26, 2024 | 2.66M | 2.8M | -4.88% | 1.97 | 2.06% | 1.83% |
| Mar 11, 2024 | 2.8M | 3.1M | -9.67% | 2.26 | 2.17% | 1.92% |
| Feb 27, 2024 | 3.1M | 3.06M | 1.29% | 2.46 | 2.4% | 2.13% |
| Feb 09, 2024 | 3.06M | 3.76M | -18.78% | 3.22 | 2.38% | 2.11% |
| Jan 24, 2024 | 3.76M | 3.91M | -3.76% | 3.95 | 2.93% | 2.6% |
| Jan 10, 2024 | 3.91M | 2.95M | 32.48% | 4.43 | 3.05% | 2.7% |
| Dec 27, 2023 | 2.95M | 2.83M | 4.19% | 2.09 | 2.3% | 2.04% |
| Dec 11, 2023 | 2.83M | 2.63M | 7.63% | 3.12 | 2.21% | 1.95% |
| Nov 27, 2023 | 2.63M | 2.69M | -2.28% | 2.1 | 2.05% | 1.82% |
| Nov 09, 2023 | 2.69M | 2.64M | 1.86% | 2.52 | 2.1% | 1.86% |
| Oct 24, 2023 | 2.64M | 2.86M | -7.55% | 2.95 | 2.06% | 1.83% |
| Oct 10, 2023 | 2.86M | 3.21M | -10.9% | 3.63 | 2.23% | 1.97% |
| Sep 26, 2023 | 3.21M | 3.14M | 2.35% | 3.94 | 2.5% | 2.22% |
| Sep 12, 2023 | 3.14M | 3.03M | 3.53% | 5.06 | 2.44% | 2.17% |
| Aug 24, 2023 | 3.03M | 3.42M | -11.46% | 3.1 | 2.36% | 2.09% |
| Aug 09, 2023 | 3.42M | 2.57M | 32.92% | 2.05 | 2.67% | 2.36% |
| Jul 25, 2023 | 2.57M | 2.07M | 24.15% | 2.29 | 2.01% | 1.78% |
| Jul 12, 2023 | 2.07M | 2.23M | -7.18% | 2.03 | 1.62% | 1.43% |
| Jun 27, 2023 | 2.23M | 2.53M | -11.71% | 1.89 | 1.74% | 1.54% |
| Jun 09, 2023 | 2.53M | 2.96M | -14.59% | 3.15 | 1.97% | 1.75% |
| May 24, 2023 | 2.96M | 2.27M | 30.71% | 2.65 | 2.31% | 2.05% |
| May 09, 2023 | 2.27M | 2M | 13.22% | 2.03 | 1.77% | 1.57% |
| Apr 25, 2023 | 2M | 2.05M | -2.32% | 3.02 | 1.56% | 1.38% |
| Apr 12, 2023 | 2.05M | 1.98M | 3.61% | 2.44 | 1.6% | 1.42% |
| Mar 24, 2023 | 1.98M | 1.85M | 7% | 2.25 | 1.55% | 1.37% |
| Mar 09, 2023 | 1.85M | 1.71M | 8.23% | 1.93 | 1.45% | 1.28% |
| Feb 27, 2023 | 1.71M | 1.87M | -8.44% | 1.95 | 1.34% | 1.18% |
| Feb 09, 2023 | 1.87M | 1.89M | -1.34% | 2.01 | 1.47% | 1.3% |
| Jan 25, 2023 | 1.89M | 1.71M | 10.64% | 1.25 | 1.48% | 1.31% |
| Jan 11, 2023 | 1.71M | 2.1M | -18.53% | 1.81 | 1.34% | 1.19% |
| Dec 27, 2022 | 2.1M | 2.49M | -15.82% | 1.68 | 1.65% | 1.46% |
| Dec 09, 2022 | 2.49M | 2.43M | 2.71% | 1.91 | 1.96% | 1.73% |
| Nov 25, 2022 | 2.43M | 2.47M | -1.98% | 1.86 | 1.91% | 1.68% |
| Nov 09, 2022 | 2.47M | 2.5M | -0.96% | 1.61 | 1.94% | 1.72% |
| Oct 25, 2022 | 2.5M | 2.71M | -7.93% | 1.4 | 1.96% | 1.74% |
| Oct 11, 2022 | 2.71M | 2.07M | 30.85% | 1 | 2.13% | 1.88% |
| Sep 26, 2022 | 2.07M | 1.89M | 9.86% | 2.28 | 1.62% | 1.43% |
| Sep 12, 2022 | 1.89M | 2M | -5.56% | 2.8 | 1.47% | 1.3% |
| Aug 24, 2022 | 2M | 1.94M | 3.18% | 2.48 | 1.56% | 1.38% |
| Aug 09, 2022 | 1.94M | 2.09M | -7.27% | 1.84 | 1.51% | 1.34% |
| Jul 26, 2022 | 2.09M | 2.52M | -17.06% | 2.61 | 1.63% | 1.44% |
| Jul 12, 2022 | 2.52M | 2.66M | -5.23% | 1.79 | 1.96% | 1.74% |
| Jun 27, 2022 | 2.66M | 2.41M | 10.52% | 2.76 | 2.05% | 1.82% |
| Jun 09, 2022 | 2.41M | 2.2M | 9.56% | 2.41 | 1.85% | 1.64% |
| May 24, 2022 | 2.2M | 2.04M | 7.8% | 1.51 | 1.69% | 1.5% |
| May 10, 2022 | 2.04M | 1.93M | 5.63% | 1.94 | 1.57% | 1.39% |
| Apr 26, 2022 | 1.93M | 1.93M | -0.06% | 2.04 | 1.48% | 1.31% |
| Apr 11, 2022 | 1.93M | 2.2M | -12.27% | 1.98 | 1.48% | 1.31% |
| Mar 24, 2022 | 2.2M | 2.48M | -11.27% | 2 | 1.69% | 1.5% |
| Mar 09, 2022 | 2.48M | 2.54M | -2.53% | 2.23 | 1.9% | 1.69% |
| Feb 25, 2022 | 2.54M | 2.95M | -13.75% | 2.31 | 1.95% | 1.73% |
| Feb 09, 2022 | 2.95M | 2.89M | 2.05% | 1.78 | 2.26% | 2.01% |
| Jan 26, 2022 | 2.89M | 2.46M | 17.34% | 1.27 | 2.22% | 1.96% |
| Jan 11, 2022 | 2.46M | 2.33M | 5.86% | 1.2 | 1.89% | 1.67% |
| Dec 27, 2021 | 2.33M | 2.39M | -2.54% | 1.85 | 1.79% | 1.58% |
| Dec 09, 2021 | 2.39M | 2.05M | 16.41% | 1.6 | 1.83% | 1.62% |
| Nov 24, 2021 | 2.05M | 2.38M | -13.77% | 2.09 | 1.57% | 1.4% |
| Nov 09, 2021 | 2.38M | 2.4M | -0.89% | 1.75 | 1.83% | 1.62% |
| Oct 26, 2021 | 2.4M | 2.49M | -3.67% | 2.92 | 1.84% | 1.63% |
| Oct 11, 2021 | 2.49M | 2.44M | 1.81% | 2.68 | 1.91% | 1.69% |
| Sep 24, 2021 | 2.44M | 2.38M | 2.89% | 1.97 | 1.85% | 1.64% |
| Sep 10, 2021 | 2.38M | 2.18M | 9.03% | 3.03 | 1.8% | 1.59% |
| Aug 24, 2021 | 2.18M | 1.79M | 21.74% | 2.38 | 1.65% | 1.46% |
| Aug 10, 2021 | 1.79M | 1.87M | -4.23% | 1.65 | 1.35% | 1.2% |
| Jul 26, 2021 | 1.87M | 1.92M | -2.86% | 1.2 | 1.41% | 1.25% |
| Jul 12, 2021 | 1.92M | 3.48M | -44.75% | 1 | 1.45% | 1.29% |
| Jun 24, 2021 | 3.48M | 3.13M | 11.14% | 1 | 2.6% | 2.31% |
| Jun 09, 2021 | 3.13M | 3.04M | 3.21% | 3.22 | 2.34% | 2.08% |
| May 25, 2021 | 3.04M | 3.22M | -5.77% | 3.64 | 2.27% | 2.02% |
| May 11, 2021 | 3.22M | 3.24M | -0.61% | 3.5 | 2.41% | 2.14% |
| Apr 26, 2021 | 3.24M | 3.65M | -11.1% | 4.32 | 2.42% | 2.15% |
| Apr 12, 2021 | 3.65M | 3.97M | -8.01% | 3.5 | 2.73% | 2.42% |
| Mar 24, 2021 | 3.97M | 3.57M | 11.03% | 3.37 | 2.62% | 2.6% |
| Mar 09, 2021 | 3.57M | 3.42M | 4.44% | 3.57 | 2.36% | 2.34% |
| Feb 24, 2021 | 3.42M | 3.67M | -6.71% | 2.81 | 2.26% | 2.25% |
| Feb 09, 2021 | 3.67M | 3.64M | 0.71% | 4.33 | 2.42% | 2.41% |
| Jan 27, 2021 | 3.64M | 3.73M | -2.31% | 2.89 | 2.4% | 2.39% |