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Biogen Inc.(BIIB US)

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SEC Filings

Financials & Metrics

FinancialsChartingShort InterestEmployees
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BIIB US​

Short Interest

Short Interest5.8M
Price$216.17
Sep 15, 2026
Short Float %3.97%
Short Ratio7.59

Daily Short Sale Volume

Short Volume146.2K
Price$192.03
Feb 20, 2026
Short Volume Ratio44.08%

Short Interest History

Settlement DateShort InterestShares FloatAvg. Daily VolumeShort FloatShort Ratio
Sep 15, 2026
5.8M
146.4M
766.5K
3.97%
7.59
Aug 31, 2026
5.7M
146.4M
661.6K
3.91%
8.66
Aug 14, 2026
5.2M
146.4M
847.1K
3.54%
6.13
Jul 31, 2026
5.5M
146.4M
1.2M
3.72%
4.73
Jul 15, 2026
6.0M
146.3M
1.7M
4.10%
3.45
Jun 30, 2026
5.7M
146.3M
1.4M
3.91%
4.14
Jun 15, 2026
5.2M
146.3M
918.7K
3.55%
5.65
May 29, 2026
4.8M
146.3M
1.1M
3.26%
4.49
May 15, 2026
4.7M
146.3M
1.1M
3.23%
4.21
Apr 30, 2026
4.5M
146.6M
1.2M
3.05%
3.59
Apr 15, 2026
4.4M
146.3M
1.4M
3.02%
3.07
Mar 31, 2026
3.8M
146.3M
1.1M
2.62%
3.47
Mar 13, 2026
4.3M
146.3M
842.1K
2.96%
5.15
Feb 27, 2026
4.2M
146.3M
908.3K
2.87%
4.63
Feb 13, 2026
4.5M
146.3M
1.9M
3.11%
2.45
Jan 30, 2026
4.7M
146.3M
1.3M
3.21%
3.62
Jan 15, 2026
4.7M
146.3M
1.8M
3.20%
2.62
Dec 31, 2025
4.5M
146.3M
2.7M
3.05%
1.67
Dec 15, 2025
6.6M
146.3M
1.8M
4.51%
3.67
Nov 28, 2025
6.8M
146.3M
2.1M
4.63%
3.26
Nov 14, 2025
6.1M
146.3M
1.9M
4.20%
3.19
Oct 31, 2025
5.6M
146.3M
1.6M
3.86%
3.60
Oct 15, 2025
5.2M
146.3M
1.9M
3.55%
2.69
Sep 30, 2025
4.9M
146.3M
1.6M
3.34%
2.98
Sep 15, 2025
5.1M
146.3M
1.7M
3.50%
3.01
Aug 29, 2025
4.7M
146.3M
1.3M
3.23%
3.58
Aug 15, 2025
4.2M
146.3M
1.5M
2.84%
2.68
Jul 31, 2025
4.0M
146.3M
1.4M
2.71%
2.78
Jul 15, 2025
3.9M
146.3M
1.2M
2.66%
3.23
Jun 30, 2025
4.0M
146.3M
1.3M
2.74%
3.07
Jun 13, 2025
3.4M
146.3M
1.3M
2.32%
2.57
May 30, 2025
3.8M
146.3M
1.8M
2.59%
2.13
May 15, 2025
3.3M
146.3M
1.7M
2.28%
1.93
Apr 30, 2025
3.2M
146.3M
1.5M
2.18%
2.17
Apr 15, 2025
3.4M
146.3M
2.1M
2.36%
1.68
Mar 31, 2025
3.3M
146.3M
1.6M
2.29%
2.09
Mar 14, 2025
3.3M
146.3M
1.9M
2.26%
1.73
Feb 28, 2025
3.7M
146.3M
1.6M
2.54%
2.30
Feb 14, 2025
3.9M
146.3M
1.7M
2.66%
2.35
Jan 31, 2025
3.7M
146.3M
1.3M
2.56%
2.91
Jan 15, 2025
3.8M
146.3M
1.3M
2.58%
3.01
Dec 31, 2024
3.7M
146.3M
1.7M
2.51%
2.20
Dec 13, 2024
2.6M
146.3M
1.3M
1.76%
1.94
Nov 29, 2024
2.7M
146.3M
1.5M
1.86%
1.76
Nov 15, 2024
2.7M
146.3M
1.8M
1.84%
1.46
Oct 31, 2024
3.1M
146.3M
1.2M
2.13%
2.52
Oct 15, 2024
3.1M
146.3M
1.4M
2.10%
2.17
Sep 30, 2024
2.8M
146.3M
1.3M
1.95%
2.24
Sep 13, 2024
3.7M
146.3M
856.8K
2.51%
4.28
Aug 30, 2024
3.3M
146.3M
691.1K
2.28%
4.83
Aug 15, 2024
2.7M
146.3M
1.1M
1.83%
2.52
Jul 31, 2024
2.7M
146.3M
1.2M
1.87%
2.36
Jul 15, 2024
3.6M
146.3M
774.0K
2.48%
4.69
Jun 28, 2024
2.7M
146.3M
1.2M
1.87%
2.20
Jun 14, 2024
3.1M
146.3M
947.4K
2.10%
3.24
May 31, 2024
3.0M
146.3M
973.2K
2.06%
3.10
May 15, 2024
3.5M
146.3M
1.0M
2.38%
3.34
Apr 30, 2024
3.1M
146.3M
1.6M
2.15%
1.97
Apr 15, 2024
3.3M
146.3M
981.1K
2.23%
3.33
Mar 28, 2024
3.6M
146.3M
1.2M
2.43%
2.85
Mar 15, 2024
2.7M
146.3M
1.4M
1.82%
1.97
Feb 29, 2024
2.8M
146.3M
1.2M
1.91%
2.26
Feb 15, 2024
3.1M
146.3M
1.3M
2.12%
2.46
Jan 31, 2024
3.1M
146.3M
949.0K
2.09%
3.22
Jan 12, 2024
3.8M
146.3M
951.6K
2.57%
3.95
Dec 29, 2023
3.9M
146.3M
881.7K
2.67%
4.43
Dec 15, 2023
3.0M
146.3M
1.4M
2.02%
2.09
Nov 30, 2023
2.8M
146.3M
908.8K
1.94%
3.12
Nov 15, 2023
2.6M
146.3M
1.3M
1.80%
2.10
Oct 31, 2023
2.7M
146.3M
1.1M
1.84%
2.52
Oct 13, 2023
2.6M
146.3M
897.7K
1.81%
2.95
Sep 29, 2023
2.9M
146.3M
788.2K
1.96%
3.63
Sep 15, 2023
3.2M
146.3M
813.8K
2.19%
3.94
Aug 31, 2023
3.1M
146.3M
620.1K
2.14%
5.06
Aug 15, 2023
3.0M
146.3M
978.3K
2.07%
3.10
Jul 31, 2023
3.4M
146.3M
1.7M
2.34%
2.05
Jul 14, 2023
2.6M
146.3M
1.1M
1.76%
2.29
Jun 30, 2023
2.1M
146.3M
1.0M
1.42%
2.03
Jun 15, 2023
2.2M
146.3M
1.2M
1.53%
1.89
May 31, 2023
2.5M
146.3M
803.2K
1.73%
3.15
May 15, 2023
3.0M
146.3M
1.1M
2.03%
2.65
Apr 28, 2023
2.3M
146.3M
1.1M
1.55%
2.03
Apr 14, 2023
2.0M
146.3M
662.4K
1.37%
3.02
Mar 31, 2023
2.0M
146.3M
840.3K
1.40%
2.44
Mar 15, 2023
2.0M
146.3M
878.5K
1.35%
2.25
Feb 28, 2023
1.8M
146.3M
955.5K
1.26%
1.93
Feb 15, 2023
1.7M
146.3M
877.2K
1.17%
1.95
Jan 31, 2023
1.9M
146.3M
926.9K
1.28%
2.01
Jan 13, 2023
1.9M
146.3M
1.5M
1.29%
1.25
Dec 30, 2022
1.7M
146.3M
941.6K
1.17%
1.81
Dec 15, 2022
2.1M
146.3M
1.2M
1.43%
1.68
Nov 30, 2022
2.5M
146.3M
1.3M
1.70%
1.91
Nov 15, 2022
2.4M
146.3M
1.3M
1.66%
1.86
Oct 31, 2022
2.5M
146.3M
1.5M
1.69%
1.61
Oct 14, 2022
2.5M
146.3M
1.8M
1.71%
1.40
Sep 30, 2022
2.7M
146.3M
3.1M
1.86%
1.00
Sep 15, 2022
2.1M
146.3M
908.1K
1.42%
2.28
Aug 31, 2022
1.9M
146.3M
675.2K
1.29%
2.80
Aug 15, 2022
2.0M
146.3M
807.3K
1.37%
2.48
Jul 29, 2022
1.9M
146.3M
1.1M
1.32%
1.84
Jul 15, 2022
2.1M
146.3M
801.7K
1.43%
2.61
Jun 30, 2022
2.5M
146.3M
1.4M
1.72%
1.79
Jun 15, 2022
2.7M
146.3M
962.7K
1.82%
2.76
May 31, 2022
2.4M
146.3M
996.8K
1.64%
2.41
May 13, 2022
2.2M
146.3M
1.4M
1.50%
1.51
Apr 29, 2022
2.0M
146.3M
1.0M
1.39%
1.94
Apr 14, 2022
1.9M
146.3M
945.3K
1.32%
2.04
Mar 31, 2022
1.9M
146.3M
974.2K
1.32%
1.98
Mar 15, 2022
2.2M
146.3M
1.1M
1.50%
2.00
Feb 28, 2022
2.5M
146.3M
1.1M
1.69%
2.23
Feb 15, 2022
2.5M
146.3M
1.1M
1.74%
2.31
Jan 31, 2022
2.9M
146.3M
1.7M
2.02%
1.78
Jan 14, 2022
2.9M
146.3M
2.3M
1.97%
1.27
Dec 31, 2021
2.5M
146.3M
2.1M
1.68%
1.20
Dec 15, 2021
2.3M
146.3M
1.3M
1.59%
1.85
Nov 30, 2021
2.4M
146.3M
1.5M
1.63%
1.60
Nov 15, 2021
2.0M
146.3M
979.4K
1.40%
2.09
Oct 29, 2021
2.4M
146.3M
1.4M
1.63%
1.75
Oct 15, 2021
2.4M
146.3M
821.9K
1.64%
2.92
Sep 30, 2021
2.5M
146.3M
930.1K
1.70%
2.68
Sep 15, 2021
2.4M
146.3M
1.2M
1.67%
1.97
Aug 31, 2021
2.4M
146.3M
784.9K
1.62%
3.03
Aug 13, 2021
2.2M
146.3M
916.6K
1.49%
2.38
Jul 30, 2021
1.8M
146.3M
1.1M
1.22%
1.65
Jul 15, 2021
1.9M
146.3M
1.6M
1.28%
1.20
Jun 30, 2021
1.9M
146.3M
2.1M
1.32%
1.00
Jun 15, 2021
3.5M
146.3M
5.1M
2.38%
1.00
May 28, 2021
3.1M
146.3M
973.2K
2.14%
3.22
May 14, 2021
3.0M
146.3M
833.8K
2.08%
3.64
Apr 30, 2021
3.2M
146.3M
920.4K
2.20%
3.50
Apr 15, 2021
3.2M
146.3M
750.5K
2.22%
4.32
Mar 31, 2021
3.6M
146.3M
1.0M
2.49%
3.50
Mar 15, 2021
4.0M
146.3M
1.2M
2.71%
3.37
Feb 26, 2021
3.6M
146.3M
1.0M
2.44%
3.57
Feb 12, 2021
3.4M
146.3M
1.2M
2.34%
2.81
Jan 29, 2021
3.7M
146.3M
846.5K
2.51%
4.33
Jan 15, 2021
3.6M
146.3M
1.3M
2.49%
2.89
Dec 31, 2020
3.7M
146.3M
1.1M
2.55%
3.28
Dec 15, 2020
3.8M
146.3M
1.1M
2.63%
3.54
Nov 30, 2020
4.1M
146.3M
1.2M
2.83%
3.44
Nov 13, 2020
3.7M
146.3M
3.9M
2.53%
1.00
Oct 30, 2020
3.8M
146.3M
1.1M
2.60%
3.34
Oct 15, 2020
3.0M
146.3M
765.8K
2.06%
3.94
Sep 30, 2020
2.8M
146.3M
1.2M
1.94%
2.32
Sep 15, 2020
3.7M
146.3M
1.0M
2.52%
3.65
Aug 31, 2020
3.3M
146.3M
1.0M
2.26%
3.31
Aug 14, 2020
2.4M
146.3M
1.3M
1.63%
1.83
Jul 31, 2020
2.6M
146.3M
940.0K
1.75%
2.72
Jul 15, 2020
2.8M
146.3M
1.2M
1.90%
2.25
Jun 30, 2020
3.3M
146.3M
2.5M
2.23%
1.28
Jun 15, 2020
4.7M
146.3M
1.2M
3.18%
3.74
May 29, 2020
4.5M
146.3M
1.0M
3.10%
4.53
May 15, 2020
4.5M
146.3M
1.3M
3.06%
3.38
Apr 30, 2020
4.2M
146.3M
2.1M
2.85%
1.98
Apr 15, 2020
3.8M
146.3M
2.0M
2.61%
1.94
Mar 31, 2020
3.0M
146.3M
2.4M
2.06%
1.25
Mar 13, 2020
3.6M
146.3M
1.8M
2.43%
1.94
Feb 28, 2020
3.1M
146.3M
1.7M
2.14%
1.89
Feb 14, 2020
3.4M
146.3M
2.5M
2.30%
1.33
Jan 31, 2020
3.1M
146.3M
1.5M
2.13%
2.03
Jan 15, 2020
3.6M
146.3M
1.1M
2.46%
3.33
Dec 31, 2019
4.3M
146.3M
1.3M
2.96%
3.35
Dec 13, 2019
4.2M
146.3M
2.0M
2.87%
2.09
Nov 29, 2019
4.2M
146.3M
1.8M
2.90%
2.30
Nov 15, 2019
3.3M
146.3M
1.6M
2.28%
2.08
Oct 31, 2019
4.1M
146.3M
4.1M
2.79%
1.00
Oct 15, 2019
3.3M
146.3M
2.0M
2.26%
1.68
Sep 30, 2019
3.6M
146.3M
1.6M
2.43%
2.18
Sep 13, 2019
3.5M
146.3M
1.6M
2.37%
2.22
Aug 30, 2019
3.8M
146.3M
1.1M
2.60%
3.44
Aug 15, 2019
3.9M
146.3M
1.3M
2.68%
3.02
Jul 31, 2019
4.1M
146.3M
1.4M
2.82%
3.03
Jul 15, 2019
3.8M
146.3M
1.3M
2.59%
2.92
Jun 28, 2019
2.9M
146.3M
2.1M
1.96%
1.35
Jun 14, 2019
4.0M
146.3M
1.4M
2.70%
2.81
May 31, 2019
3.8M
146.3M
1.7M
2.62%
2.29
May 15, 2019
3.9M
146.3M
2.1M
2.67%
1.89
Apr 30, 2019
4.0M
146.3M
2.4M
2.71%
1.66
Apr 15, 2019
4.1M
146.3M
2.6M
2.81%
1.55
Mar 29, 2019
3.6M
146.3M
5.6M
2.44%
1.00
Mar 15, 2019
2.9M
146.3M
1.3M
1.96%
2.23
Feb 28, 2019
2.9M
146.3M
901.4K
2.01%
3.26
Feb 15, 2019
2.7M
146.3M
1.4M
1.87%
2.00
Jan 31, 2019
2.8M
146.3M
1.3M
1.95%
2.12
Jan 15, 2019
3.6M
146.3M
1.3M
2.45%
2.83
Dec 31, 2018
3.8M
146.3M
1.7M
2.61%
2.21
Dec 14, 2018
3.7M
146.3M
1.2M
2.50%
2.96
Nov 30, 2018
3.4M
146.3M
1.1M
2.35%
3.10
Nov 15, 2018
3.7M
146.3M
1.1M
2.52%
3.31
Oct 31, 2018
3.4M
146.3M
1.8M
2.32%
1.90
Oct 15, 2018
3.2M
146.3M
1.1M
2.19%
2.90
Sep 28, 2018
3.1M
146.3M
1.5M
2.11%
2.12
Sep 14, 2018
3.2M
146.3M
977.0K
2.15%
3.23
Aug 31, 2018
3.4M
146.3M
840.0K
2.30%
4.00
Aug 15, 2018
3.3M
146.3M
1.2M
2.29%
2.73
Jul 31, 2018
4.0M
146.3M
2.5M
2.73%
1.59
Jul 13, 2018
3.9M
146.3M
3.0M
2.67%
1.32
Jun 29, 2018
4.3M
146.3M
1.5M
2.93%
2.77
Jun 15, 2018
4.7M
146.3M
1.3M
3.23%
3.61
May 31, 2018
4.3M
146.3M
1.6M
2.96%
2.71
May 15, 2018
3.9M
146.3M
1.9M
2.64%
2.07
Apr 30, 2018
3.4M
146.3M
2.0M
2.36%
1.76
Apr 13, 2018
3.5M
146.3M
1.7M
2.39%
2.09
Mar 29, 2018
3.2M
146.3M
1.9M
2.16%
1.70
Mar 15, 2018
3.5M
146.3M
1.6M
2.41%
2.15
Feb 28, 2018
3.5M
146.3M
2.1M
2.37%
1.65
Feb 15, 2018
3.4M
146.3M
1.9M
2.32%
1.77
Jan 31, 2018
3.3M
146.3M
1.4M
2.27%
2.34
Jan 12, 2018
3.4M
146.3M
1.2M
2.33%
2.88
Dec 29, 2017
3.7M
146.3M
974.2K
2.51%
3.76