What is the current 10-day volatility of BIIB?

As of today, BIIB 10-day volatility is 20.46%

What 10-day volatility category does BIIB fall into?

Based on its current 10-day historical volatility, BIIB falls into the low 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 16.17% on September 29, 2025

What is the current 1-month volatility of BIIB?

As of today, BIIB 1-month volatility is 25.90%

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 36.26%

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 35.14%

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 30.07% on September 29, 2025

Biogen Inc. (BIIB) Stock Volatility History & Chart

10-Day

20.46%

September 28, 2026

Summary

Current Value: As of today, BIIB 10-day volatility is 20.46%, down -0.49% on September 28, 2026
Value Category: Based on its current 10-day historical volatility, BIIB falls into the low 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 16.17% on September 29, 2025

10-Day Volatility Chart

Performance

BIIB Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
10-Day Volatility	Sep 28, 26	20.46%	-0.5%	-34.2%	-48.0%	+19.9%	+26.5%	+41.1%	+27.0%
1-Month Volatility	Sep 28, 26	25.90%	+2.8%	-6.1%	-30.9%	+20.2%	-17.8%	+125.6%	-1.0%
3-Month Volatility	Sep 28, 26	36.26%	-5.7%	-7.9%	+1.9%	+40.4%	+13.3%	+118.4%	+31.6%
1-Year Volatility	Sep 28, 26	35.14%	+0.1%	-1.0%	+3.1%	+8.5%	+16.9%	+58.2%	-50.6%
14-Day RSI	Sep 28, 26	63.87	+1.7%	+9.6%	-8.5%	+14.5%	+31.8%	+50.5%	+154.6%
Beta	Sep 28, 26	0.33	-2.9%	+17.9%	+3.1%	-42.1%	-45.9%	-51.5%	-50.8%
ATR	Sep 28, 26	$5.72	-1.0%	-2.3%	-13.3%	+37.9%	+48.9%	+29.6%	-27.6%
Price	Sep 29, 26	$225.75	-1.3%	+3.3%	+4.2%	+28.3%	+63.0%	-12.2%	-20.9%
200-Day SMA	Sep 28, 26	$194.21	+0.1%	+2.4%	+10.0%	+37.6%	+43.5%	-30.8%	-34.7%
50-Day SMA	Sep 28, 26	$213.41	+0.2%	+2.9%	+10.1%	+27.5%	+56.8%	-19.3%	-34.2%
20-Day SMA	Sep 28, 26	$219.76	+0.2%	+3.5%	+10.6%	+24.8%	+55.3%	-15.1%	-27.7%

10-Day Volatility History

Date	Value	Change
Sep 29, 2026	20.46%	+19.9%
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 20.46%
What 10-day volatility category does BIIB fall into?: Based on its current 10-day historical volatility, BIIB falls into the low 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 16.17% on September 29, 2025

1-Month

25.90%

September 28, 2026

Summary

Current Value: As of today, BIIB 1-month volatility is 25.90%, up +2.82% on September 28, 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	Sep 28, 26	25.90%	+2.8%	-6.1%	-30.9%	+20.2%	-17.8%	+125.6%	-1.0%
10-Day Volatility	Sep 28, 26	20.46%	-0.5%	-34.2%	-48.0%	+19.9%	+26.5%	+41.1%	+27.0%
3-Month Volatility	Sep 28, 26	36.26%	-5.7%	-7.9%	+1.9%	+40.4%	+13.3%	+118.4%	+31.6%
1-Year Volatility	Sep 28, 26	35.14%	+0.1%	-1.0%	+3.1%	+8.5%	+16.9%	+58.2%	-50.6%
14-Day RSI	Sep 28, 26	63.87	+1.7%	+9.6%	-8.5%	+14.5%	+31.8%	+50.5%	+154.6%
Beta	Sep 28, 26	0.33	-2.9%	+17.9%	+3.1%	-42.1%	-45.9%	-51.5%	-50.8%
ATR	Sep 28, 26	$5.72	-1.0%	-2.3%	-13.3%	+37.9%	+48.9%	+29.6%	-27.6%
Price	Sep 29, 26	$225.75	-1.3%	+3.3%	+4.2%	+28.3%	+63.0%	-12.2%	-20.9%
200-Day SMA	Sep 28, 26	$194.21	+0.1%	+2.4%	+10.0%	+37.6%	+43.5%	-30.8%	-34.7%
50-Day SMA	Sep 28, 26	$213.41	+0.2%	+2.9%	+10.1%	+27.5%	+56.8%	-19.3%	-34.2%
20-Day SMA	Sep 28, 26	$219.76	+0.2%	+3.5%	+10.6%	+24.8%	+55.3%	-15.1%	-27.7%

1-Month Volatility History

Date	Value	Change
Sep 29, 2026	25.90%	+15.3%
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 25.90%
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

36.26%

September 28, 2026

Summary

Current Value: As of today, BIIB 3-month volatility is 36.26%, down -5.70% on September 28, 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	Sep 28, 26	36.26%	-5.7%	-7.9%	+1.9%	+40.4%	+13.3%	+118.4%	+31.6%
10-Day Volatility	Sep 28, 26	20.46%	-0.5%	-34.2%	-48.0%	+19.9%	+26.5%	+41.1%	+27.0%
1-Month Volatility	Sep 28, 26	25.90%	+2.8%	-6.1%	-30.9%	+20.2%	-17.8%	+125.6%	-1.0%
1-Year Volatility	Sep 28, 26	35.14%	+0.1%	-1.0%	+3.1%	+8.5%	+16.9%	+58.2%	-50.6%
14-Day RSI	Sep 28, 26	63.87	+1.7%	+9.6%	-8.5%	+14.5%	+31.8%	+50.5%	+154.6%
Beta	Sep 28, 26	0.33	-2.9%	+17.9%	+3.1%	-42.1%	-45.9%	-51.5%	-50.8%
ATR	Sep 28, 26	$5.72	-1.0%	-2.3%	-13.3%	+37.9%	+48.9%	+29.6%	-27.6%
Price	Sep 29, 26	$225.75	-1.3%	+3.3%	+4.2%	+28.3%	+63.0%	-12.2%	-20.9%
200-Day SMA	Sep 28, 26	$194.21	+0.1%	+2.4%	+10.0%	+37.6%	+43.5%	-30.8%	-34.7%
50-Day SMA	Sep 28, 26	$213.41	+0.2%	+2.9%	+10.1%	+27.5%	+56.8%	-19.3%	-34.2%
20-Day SMA	Sep 28, 26	$219.76	+0.2%	+3.5%	+10.6%	+24.8%	+55.3%	-15.1%	-27.7%

3-Month Volatility History

Date	Value	Change
Sep 29, 2026	36.26%	+12.5%
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 36.26%
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

35.14%

September 28, 2026

Summary

Current Value: As of today, BIIB 1-year volatility is 35.14%, up +0.14% on September 28, 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 30.07% on September 29, 2025

Performance

BIIB Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
1-Year Volatility	Sep 28, 26	35.14%	+0.1%	-1.0%	+3.1%	+8.5%	+16.9%	+58.2%	-50.6%
10-Day Volatility	Sep 28, 26	20.46%	-0.5%	-34.2%	-48.0%	+19.9%	+26.5%	+41.1%	+27.0%
1-Month Volatility	Sep 28, 26	25.90%	+2.8%	-6.1%	-30.9%	+20.2%	-17.8%	+125.6%	-1.0%
3-Month Volatility	Sep 28, 26	36.26%	-5.7%	-7.9%	+1.9%	+40.4%	+13.3%	+118.4%	+31.6%
1-Year Volatility	Sep 28, 26	35.14%	+0.1%	-1.0%	+3.1%	+8.5%	+16.9%	+58.2%	-50.6%
14-Day RSI	Sep 28, 26	63.87	+1.7%	+9.6%	-8.5%	+14.5%	+31.8%	+50.5%	+154.6%
Beta	Sep 28, 26	0.33	-2.9%	+17.9%	+3.1%	-42.1%	-45.9%	-51.5%	-50.8%
ATR	Sep 28, 26	$5.72	-1.0%	-2.3%	-13.3%	+37.9%	+48.9%	+29.6%	-27.6%
Price	Sep 29, 26	$225.75	-1.3%	+3.3%	+4.2%	+28.3%	+63.0%	-12.2%	-20.9%
200-Day SMA	Sep 28, 26	$194.21	+0.1%	+2.4%	+10.0%	+37.6%	+43.5%	-30.8%	-34.7%
50-Day SMA	Sep 28, 26	$213.41	+0.2%	+2.9%	+10.1%	+27.5%	+56.8%	-19.3%	-34.2%
20-Day SMA	Sep 28, 26	$219.76	+0.2%	+3.5%	+10.6%	+24.8%	+55.3%	-15.1%	-27.7%

1-Year Volatility History

Date	Value	Change
Sep 29, 2026	35.14%	+8.5%
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 35.14%
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 30.07% on September 29, 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