What is the current 10-day volatility of BIIB?

As of today, BIIB 10-day volatility is 26.84%

What 10-day volatility category does BIIB fall into?

Based on its current 10-day historical volatility, BIIB falls into the moderate volatility category

What is BIIB 10-day volatility 1-year high?

BIIB 10-day volatility reached a 1-year high of 67.93% on July 16, 2026

What is BIIB 10-day volatility 1-year low?

BIIB 10-day volatility reached a 1-year low of 15.00% on September 25, 2025

What is the current 1-month volatility of BIIB?

As of today, BIIB 1-month volatility is 30.06%

What 1-month volatility category does BIIB fall into?

Based on its current 1-month historical volatility, BIIB falls into the moderate volatility category

What is BIIB 1-month volatility 1-year high?

BIIB 1-month volatility reached a 1-year high of 57.01% on July 24, 2026

What is BIIB 1-month volatility 1-year low?

BIIB 1-month volatility reached a 1-year low of 21.33% on January 2, 2026

What is the current 3-month volatility of BIIB?

As of today, BIIB 3-month volatility is 39.09%

What 3-month volatility category does BIIB fall into?

Based on its current 3-month historical volatility, BIIB falls into the moderate volatility category

What is BIIB 3-month volatility 1-year high?

BIIB 3-month volatility reached a 1-year high of 42.18% on July 22, 2026

What is BIIB 3-month volatility 1-year low?

BIIB 3-month volatility reached a 1-year low of 25.46% on January 2, 2026

What is the current 1-year volatility of BIIB?

As of today, BIIB 1-year volatility is 35.39%

What 1-year volatility category does BIIB fall into?

Based on its current 1-year historical volatility, BIIB falls into the moderate volatility category

What is BIIB 1-year volatility 1-year high?

BIIB 1-year volatility reached a 1-year high of 35.82% on July 20, 2026

What is BIIB 1-year volatility 1-year low?

BIIB 1-year volatility reached a 1-year low of 29.12% on August 22, 2025

Biogen Inc. (BIIB) Stock Volatility History & Chart

10-Day

26.84%

August 19, 2026

Summary

Current Value: As of today, BIIB 10-day volatility is 26.84%, up +39.65% on August 19, 2026
Value Category: Based on its current 10-day historical volatility, BIIB falls into the moderate volatility category
1-Year High: BIIB 10-day volatility reached a 1-year high of 67.93% on July 16, 2026
1-Year Low: BIIB 10-day volatility reached a 1-year low of 15.00% on September 25, 2025

10-Day Volatility Chart

Performance

BIIB Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
10-Day Volatility	Aug 19, 26	26.84%	+39.6%	-59.4%	-33.0%	+57.3%	-32.1%	+45.5%	+46.5%
1-Month Volatility	Aug 19, 26	30.06%	+9.3%	-47.0%	-23.7%	+39.5%	-12.3%	+57.8%	+74.3%
3-Month Volatility	Aug 19, 26	39.09%	+2.1%	-6.9%	+15.0%	+51.3%	+26.3%	+102.6%	-52.9%
1-Year Volatility	Aug 19, 26	35.39%	+0.5%	-1.0%	+6.2%	+9.3%	+21.4%	-24.6%	-50.2%
14-Day RSI	Aug 19, 26	65.67	+13.2%	+24.4%	+28.7%	+17.8%	+6.8%	+90.5%	+33.0%
Beta	Aug 19, 26	0.25	+4.2%	+8.7%	-49.0%	-56.1%	-59.0%	-74.5%	-64.8%
ATR	Aug 19, 26	$6.53	+3.8%	-27.8%	+9.8%	+57.3%	+55.3%	+11.3%	-30.1%
Price	Aug 19, 26	$221.56	+4.2%	+7.6%	+16.3%	+25.9%	+59.6%	-15.2%	-34.6%
200-Day SMA	Aug 19, 26	$187.36	+0.2%	+3.7%	+11.3%	+32.7%	+35.0%	-34.4%	-35.1%
50-Day SMA	Aug 19, 26	$204.52	+0.3%	+2.9%	+10.2%	+22.2%	+56.8%	-27.0%	-41.6%
20-Day SMA	Aug 19, 26	$207.17	+0.6%	+1.2%	+8.5%	+17.7%	+57.4%	-23.0%	-38.5%

10-Day Volatility History

Date	Value	Change
Aug 19, 2026	26.84%	+57.3%
Dec 31, 2025	17.06%	-19.3%
Dec 31, 2024	21.13%	-18.0%
Dec 31, 2023	25.77%	+60.1%
Dec 31, 2022	16.10%	-74.4%
Dec 31, 2021	63.00%	+334.8%
Dec 31, 2020	14.49%	+5.1%
Dec 31, 2019	13.79%	-72.9%
Dec 31, 2018	50.90%	+126.9%
Dec 31, 2017	22.43%	-5.8%
Dec 31, 2016	23.82%	+43.3%
Dec 31, 2015	16.62%	-64.3%
Dec 31, 2014	46.50%	+90.8%
Dec 31, 2013	24.37%	+110.3%
Dec 31, 2012	11.59%	+17.7%
Dec 31, 2011	9.85%	+40.1%
Dec 31, 2010	7.03%	-65.1%
Dec 31, 2009	20.17%	-24.9%

Date	Value	Change
Dec 31, 2008	26.84%	-27.7%
Dec 31, 2007	37.14%	+142.3%
Dec 31, 2006	15.33%	-36.8%
Dec 31, 2005	24.25%	-2.3%
Dec 31, 2004	24.81%	+48.1%
Dec 31, 2003	16.75%	-49.7%
Dec 31, 2002	33.31%	-26.0%
Dec 31, 2001	45.02%	-50.2%
Dec 31, 2000	90.45%	-19.5%
Dec 31, 1999	112.33%	+101.9%
Dec 31, 1998	55.63%	+49.8%
Dec 31, 1997	37.14%	-32.8%
Dec 31, 1996	55.24%	-58.6%
Dec 31, 1995	133.38%	+124.5%
Dec 31, 1994	59.41%	-11.7%
Dec 31, 1993	67.29%	+2.0%
Dec 31, 1992	65.95%	-5.1%
Dec 31, 1991	69.48%	-

FAQ

What is the current 10-day volatility of BIIB?: As of today, BIIB 10-day volatility is 26.84%
What 10-day volatility category does BIIB fall into?: Based on its current 10-day historical volatility, BIIB falls into the moderate volatility category
What is BIIB 10-day volatility 1-year high?: BIIB 10-day volatility reached a 1-year high of 67.93% on July 16, 2026
What is BIIB 10-day volatility 1-year low?: BIIB 10-day volatility reached a 1-year low of 15.00% on September 25, 2025

1-Month

30.06%

August 19, 2026

Summary

Current Value: As of today, BIIB 1-month volatility is 30.06%, up +9.35% on August 19, 2026
Value Category: Based on its current 1-month historical volatility, BIIB falls into the moderate volatility category
1-Year High: BIIB 1-month volatility reached a 1-year high of 57.01% on July 24, 2026
1-Year Low: BIIB 1-month volatility reached a 1-year low of 21.33% on January 2, 2026

Performance

BIIB Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
1-Month Volatility	Aug 19, 26	30.06%	+9.3%	-47.0%	-23.7%	+39.5%	-12.3%	+57.8%	+74.3%
10-Day Volatility	Aug 19, 26	26.84%	+39.6%	-59.4%	-33.0%	+57.3%	-32.1%	+45.5%	+46.5%
3-Month Volatility	Aug 19, 26	39.09%	+2.1%	-6.9%	+15.0%	+51.3%	+26.3%	+102.6%	-52.9%
1-Year Volatility	Aug 19, 26	35.39%	+0.5%	-1.0%	+6.2%	+9.3%	+21.4%	-24.6%	-50.2%
14-Day RSI	Aug 19, 26	65.67	+13.2%	+24.4%	+28.7%	+17.8%	+6.8%	+90.5%	+33.0%
Beta	Aug 19, 26	0.25	+4.2%	+8.7%	-49.0%	-56.1%	-59.0%	-74.5%	-64.8%
ATR	Aug 19, 26	$6.53	+3.8%	-27.8%	+9.8%	+57.3%	+55.3%	+11.3%	-30.1%
Price	Aug 19, 26	$221.56	+4.2%	+7.6%	+16.3%	+25.9%	+59.6%	-15.2%	-34.6%
200-Day SMA	Aug 19, 26	$187.36	+0.2%	+3.7%	+11.3%	+32.7%	+35.0%	-34.4%	-35.1%
50-Day SMA	Aug 19, 26	$204.52	+0.3%	+2.9%	+10.2%	+22.2%	+56.8%	-27.0%	-41.6%
20-Day SMA	Aug 19, 26	$207.17	+0.6%	+1.2%	+8.5%	+17.7%	+57.4%	-23.0%	-38.5%

1-Month Volatility History

Date	Value	Change
Aug 19, 2026	30.06%	+33.8%
Dec 31, 2025	22.47%	-1.3%
Dec 31, 2024	22.77%	-8.0%
Dec 31, 2023	24.76%	+47.0%
Dec 31, 2022	16.84%	-63.4%
Dec 31, 2021	45.96%	+187.6%
Dec 31, 2020	15.98%	-23.4%
Dec 31, 2019	20.87%	-47.6%
Dec 31, 2018	39.85%	+85.6%
Dec 31, 2017	21.47%	+5.1%
Dec 31, 2016	20.43%	-29.3%
Dec 31, 2015	28.89%	-36.6%
Dec 31, 2014	45.54%	+93.7%
Dec 31, 2013	23.51%	+81.7%
Dec 31, 2012	12.94%	-35.0%
Dec 31, 2011	19.90%	+17.2%
Dec 31, 2010	16.98%	+2.0%
Dec 31, 2009	16.64%	-72.5%

Date	Value	Change
Dec 31, 2008	60.44%	-32.4%
Dec 31, 2007	89.37%	+452.0%
Dec 31, 2006	16.19%	-37.5%
Dec 31, 2005	25.90%	-9.9%
Dec 31, 2004	28.76%	+32.1%
Dec 31, 2003	21.77%	-35.9%
Dec 31, 2002	33.98%	-22.4%
Dec 31, 2001	43.78%	-45.4%
Dec 31, 2000	80.16%	-24.2%
Dec 31, 1999	105.73%	+38.6%
Dec 31, 1998	76.29%	+86.8%
Dec 31, 1997	40.84%	-35.2%
Dec 31, 1996	62.99%	-38.2%
Dec 31, 1995	101.97%	+74.3%
Dec 31, 1994	58.49%	-36.5%
Dec 31, 1993	92.06%	+58.7%
Dec 31, 1992	58.00%	-27.6%
Dec 31, 1991	80.12%	-

FAQ

What is the current 1-month volatility of BIIB?: As of today, BIIB 1-month volatility is 30.06%
What 1-month volatility category does BIIB fall into?: Based on its current 1-month historical volatility, BIIB falls into the moderate volatility category
What is BIIB 1-month volatility 1-year high?: BIIB 1-month volatility reached a 1-year high of 57.01% on July 24, 2026
What is BIIB 1-month volatility 1-year low?: BIIB 1-month volatility reached a 1-year low of 21.33% on January 2, 2026

3-Month

39.09%

August 19, 2026

Summary

Current Value: As of today, BIIB 3-month volatility is 39.09%, up +2.09% on August 19, 2026
Value Category: Based on its current 3-month historical volatility, BIIB falls into the moderate volatility category
1-Year High: BIIB 3-month volatility reached a 1-year high of 42.18% on July 22, 2026
1-Year Low: BIIB 3-month volatility reached a 1-year low of 25.46% on January 2, 2026

Performance

BIIB Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
3-Month Volatility	Aug 19, 26	39.09%	+2.1%	-6.9%	+15.0%	+51.3%	+26.3%	+102.6%	-52.9%
10-Day Volatility	Aug 19, 26	26.84%	+39.6%	-59.4%	-33.0%	+57.3%	-32.1%	+45.5%	+46.5%
1-Month Volatility	Aug 19, 26	30.06%	+9.3%	-47.0%	-23.7%	+39.5%	-12.3%	+57.8%	+74.3%
1-Year Volatility	Aug 19, 26	35.39%	+0.5%	-1.0%	+6.2%	+9.3%	+21.4%	-24.6%	-50.2%
14-Day RSI	Aug 19, 26	65.67	+13.2%	+24.4%	+28.7%	+17.8%	+6.8%	+90.5%	+33.0%
Beta	Aug 19, 26	0.25	+4.2%	+8.7%	-49.0%	-56.1%	-59.0%	-74.5%	-64.8%
ATR	Aug 19, 26	$6.53	+3.8%	-27.8%	+9.8%	+57.3%	+55.3%	+11.3%	-30.1%
Price	Aug 19, 26	$221.56	+4.2%	+7.6%	+16.3%	+25.9%	+59.6%	-15.2%	-34.6%
200-Day SMA	Aug 19, 26	$187.36	+0.2%	+3.7%	+11.3%	+32.7%	+35.0%	-34.4%	-35.1%
50-Day SMA	Aug 19, 26	$204.52	+0.3%	+2.9%	+10.2%	+22.2%	+56.8%	-27.0%	-41.6%
20-Day SMA	Aug 19, 26	$207.17	+0.6%	+1.2%	+8.5%	+17.7%	+57.4%	-23.0%	-38.5%

3-Month Volatility History

Date	Value	Change
Aug 19, 2026	39.09%	+21.2%
Dec 31, 2025	32.24%	+46.8%
Dec 31, 2024	21.96%	-16.9%
Dec 31, 2023	26.42%	-4.1%
Dec 31, 2022	27.55%	-19.4%
Dec 31, 2021	34.18%	-68.4%
Dec 31, 2020	108.21%	+90.7%
Dec 31, 2019	56.73%	+72.3%
Dec 31, 2018	32.92%	+46.4%
Dec 31, 2017	22.49%	-27.8%
Dec 31, 2016	31.13%	-5.0%
Dec 31, 2015	32.77%	-10.7%
Dec 31, 2014	36.70%	-8.4%
Dec 31, 2013	40.05%	+92.2%
Dec 31, 2012	20.84%	-45.8%
Dec 31, 2011	38.48%	+106.9%
Dec 31, 2010	18.60%	-29.8%
Dec 31, 2009	26.49%	-59.7%

Date	Value	Change
Dec 31, 2008	65.74%	-3.8%
Dec 31, 2007	68.35%	+175.2%
Dec 31, 2006	24.84%	-17.6%
Dec 31, 2005	30.13%	-2.8%
Dec 31, 2004	31.00%	-2.1%
Dec 31, 2003	31.68%	-39.6%
Dec 31, 2002	52.42%	+14.5%
Dec 31, 2001	45.79%	-44.9%
Dec 31, 2000	83.08%	-1.1%
Dec 31, 1999	84.04%	+14.5%
Dec 31, 1998	73.38%	+25.8%
Dec 31, 1997	58.33%	-6.0%
Dec 31, 1996	62.08%	-34.8%
Dec 31, 1995	95.28%	+32.7%
Dec 31, 1994	71.79%	-7.1%
Dec 31, 1993	77.31%	+1.8%
Dec 31, 1992	75.94%	-16.4%
Dec 31, 1991	90.89%	-

FAQ

What is the current 3-month volatility of BIIB?: As of today, BIIB 3-month volatility is 39.09%
What 3-month volatility category does BIIB fall into?: Based on its current 3-month historical volatility, BIIB falls into the moderate volatility category
What is BIIB 3-month volatility 1-year high?: BIIB 3-month volatility reached a 1-year high of 42.18% on July 22, 2026
What is BIIB 3-month volatility 1-year low?: BIIB 3-month volatility reached a 1-year low of 25.46% on January 2, 2026

1-Year

35.39%

August 19, 2026

Summary

Current Value: As of today, BIIB 1-year volatility is 35.39%, up +0.51% on August 19, 2026
Value Category: Based on its current 1-year historical volatility, BIIB falls into the moderate volatility category
1-Year High: BIIB 1-year volatility reached a 1-year high of 35.82% on July 20, 2026
1-Year Low: BIIB 1-year volatility reached a 1-year low of 29.12% on August 22, 2025

Performance

BIIB Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
1-Year Volatility	Aug 19, 26	35.39%	+0.5%	-1.0%	+6.2%	+9.3%	+21.4%	-24.6%	-50.2%
10-Day Volatility	Aug 19, 26	26.84%	+39.6%	-59.4%	-33.0%	+57.3%	-32.1%	+45.5%	+46.5%
1-Month Volatility	Aug 19, 26	30.06%	+9.3%	-47.0%	-23.7%	+39.5%	-12.3%	+57.8%	+74.3%
3-Month Volatility	Aug 19, 26	39.09%	+2.1%	-6.9%	+15.0%	+51.3%	+26.3%	+102.6%	-52.9%
1-Year Volatility	Aug 19, 26	35.39%	+0.5%	-1.0%	+6.2%	+9.3%	+21.4%	-24.6%	-50.2%
14-Day RSI	Aug 19, 26	65.67	+13.2%	+24.4%	+28.7%	+17.8%	+6.8%	+90.5%	+33.0%
Beta	Aug 19, 26	0.25	+4.2%	+8.7%	-49.0%	-56.1%	-59.0%	-74.5%	-64.8%
ATR	Aug 19, 26	$6.53	+3.8%	-27.8%	+9.8%	+57.3%	+55.3%	+11.3%	-30.1%
Price	Aug 19, 26	$221.56	+4.2%	+7.6%	+16.3%	+25.9%	+59.6%	-15.2%	-34.6%
200-Day SMA	Aug 19, 26	$187.36	+0.2%	+3.7%	+11.3%	+32.7%	+35.0%	-34.4%	-35.1%
50-Day SMA	Aug 19, 26	$204.52	+0.3%	+2.9%	+10.2%	+22.2%	+56.8%	-27.0%	-41.6%
20-Day SMA	Aug 19, 26	$207.17	+0.6%	+1.2%	+8.5%	+17.7%	+57.4%	-23.0%	-38.5%

1-Year Volatility History

Date	Value	Change
Aug 19, 2026	35.39%	+9.3%
Dec 31, 2025	32.39%	+27.6%
Dec 31, 2024	25.38%	+16.0%
Dec 31, 2023	21.88%	-56.9%
Dec 31, 2022	50.73%	+3.3%
Dec 31, 2021	49.12%	-28.9%
Dec 31, 2020	69.11%	+48.6%
Dec 31, 2019	46.52%	+30.0%
Dec 31, 2018	35.78%	+54.0%
Dec 31, 2017	23.24%	-33.9%
Dec 31, 2016	35.17%	-14.6%
Dec 31, 2015	41.20%	+14.7%
Dec 31, 2014	35.92%	+8.9%
Dec 31, 2013	32.97%	+68.3%
Dec 31, 2012	19.59%	-42.3%
Dec 31, 2011	33.98%	+33.8%
Dec 31, 2010	25.39%	-20.6%
Dec 31, 2009	31.97%	-41.4%

Date	Value	Change
Dec 31, 2008	54.59%	+35.0%
Dec 31, 2007	40.45%	+57.8%
Dec 31, 2006	25.63%	-51.7%
Dec 31, 2005	53.02%	+37.5%
Dec 31, 2004	38.57%	-3.2%
Dec 31, 2003	39.85%	-36.2%
Dec 31, 2002	62.49%	-11.7%
Dec 31, 2001	70.79%	-30.6%
Dec 31, 2000	101.95%	+33.0%
Dec 31, 1999	76.67%	+12.5%
Dec 31, 1998	68.13%	+9.4%
Dec 31, 1997	62.28%	-13.9%
Dec 31, 1996	72.30%	-16.5%
Dec 31, 1995	86.62%	+13.2%
Dec 31, 1994	76.51%	-23.1%
Dec 31, 1993	99.51%	+12.2%
Dec 31, 1992	88.66%	+1.6%
Dec 31, 1991	87.25%	-

FAQ

What is the current 1-year volatility of BIIB?: As of today, BIIB 1-year volatility is 35.39%
What 1-year volatility category does BIIB fall into?: Based on its current 1-year historical volatility, BIIB falls into the moderate volatility category
What is BIIB 1-year volatility 1-year high?: BIIB 1-year volatility reached a 1-year high of 35.82% on July 20, 2026
What is BIIB 1-year volatility 1-year low?: BIIB 1-year volatility reached a 1-year low of 29.12% on August 22, 2025

Data Sources & References

BIIB Official Website www.biogen.com
Most Recent Annual Report (10-K) www.sec.gov/Archives/edgar/data/875045/000087504526000013/0000875045-26-000013-index.htm
BIIB Profile on Yahoo Finance finance.yahoo.com/quote/BIIB
BIIB Profile on NASDAQ.com www.nasdaq.com/market-activity/stocks/biib