What is the current annual net margin of BIIB?

As of today, BIIB annual net margin is 13.07%

What is 1-year change in BIIB annual net margin?

BIIB annual net margin is down -25.78% year-over-year

What is 3-year change in BIIB annual net margin?

BIIB annual net margin is down -58.36% over the past 3 years

How far is BIIB annual net margin from its all-time high?

BIIB annual net margin is currently -71.78% below its historical high of 46.32% set on December 31, 2019

How does BIIB annual net margin rank versus sector peers?

BIIB annual net margin is higher than 88.65% of companies in Healthcare sector

When is BIIB next annual earnings release?

The next annual earnings release for BIIB is on February 5, 2027

What is the current quarterly net margin of BIIB?

As of today, BIIB quarterly net margin is -0.77%

What is BIIB quarterly net margin most recent change?

BIIB quarterly net margin was down -120.70% on September 30, 2026

What is 1-year change in BIIB quarterly net margin?

BIIB quarterly net margin is down -104.05% year-over-year

How far is BIIB quarterly net margin from its all-time high?

BIIB quarterly net margin is currently -101.10% below its historical high of 69.90% set on June 30, 1998

How does BIIB quarterly net margin rank versus sector peers?

BIIB quarterly net margin is higher than 62.87% of companies in Healthcare sector

When is BIIB next earnings release?

The next earnings release for BIIB is on February 5, 2027

Biogen Inc. (BIIB) Net Margin History & Chart Since 1984

Annual Net Margin

13.07%4.54%-25.78%

December 31, 2025

Summary

Current Value: As of today, BIIB annual net margin is 13.07%, down -25.78% on December 31, 2025
Historical Performance: BIIB annual net margin is down -58.36% over the past 3 years, down -60.23% over the past 5 years
All-Time High Comparison: BIIB annual net margin is currently -71.78% below its historical high of 46.32% set on December 31, 2019
3-Year Low Comparison: BIIB annual net margin is +6.00% above its 3-year low of 12.33% reached on December 31, 2023
Sector Comparison: BIIB annual net margin is higher than 88.65% of companies in Healthcare sector

Net Margin Chart

beforeafter

Performance

BIIB Performance
Metric	Date	Value	1Y	3Y	5Y	15Y
Annual Net Margin	Dec 31, 25	13.07%	-25.8%	-58.4%	-60.2%	-44.3%
Quarterly Net Margin	Sep 30, 26	-0.77%	-104.0%	+72.5%	-106.4%	-102.4%
Price	Nov 6, 26	$248.35	+58.5%	-0.1%	-10.9%	+118.8%
PE Ratio	Nov 6, 26	106.31	+644.0%	+330.1%	+289.8%	+349.7%
Annual Revenue	Dec 31, 25	$9.53B	+2.9%	+1.1%	-22.9%	+149.4%
Annual Net Income	Dec 31, 25	$1.29B	-20.8%	-56.3%	-68.2%	+44.2%
Annual Gross Margin	Dec 31, 25	75.69%	+11.6%	+7.6%	-7.3%	-10.0%
Annual Operating Margin	Dec 31, 25	27.90%	+21.7%	+15.7%	-9.3%	+57.9%

Net Margin Highs

BIIB Annual Net Margin Highs Comparison
Period	High	Date	Current
3Y	31.39%	N/A	-58.4%
5Y	32.86%	N/A	-60.2%
All	46.32%	Dec 31, 19	-71.8%

Net Margin Lows

BIIB Annual Net Margin Lows Comparison
Period	Low	Date	Current
3Y	12.33%	Dec 31, 23	+6.0%
5Y	12.33%	Dec 31, 23	+6.0%
All	-440.63%	Dec 31, 86	+103.0%

Net Margin History

Year	Value	Change
2025	13.07%	-25.8%
2024	17.61%	+42.8%
2023	12.33%	-60.7%
2022	31.39%	+89.0%
2021	16.61%	-49.5%
2020	32.86%	-29.1%
2019	46.32%	+24.8%
2018	37.12%	+52.8%
2017	24.30%	-33.0%
2016	36.25%	-6.0%
2015	38.55%	+12.5%
2014	34.27%	+7.8%
2013	31.78%	+2.5%
2012	31.01%	+3.1%
2011	30.07%	+28.2%
2010	23.45%	-12.2%
2009	26.70%	+14.2%
2008	23.39%	+3.8%
2007	22.54%	+118.8%
2006	10.30%	+55.4%
2005	6.63%	+486.7%

Year	Value	Change
2004	1.13%	+100.9%
2003	-128.85%	-451.7%
2002	36.64%	-1.7%
2001	37.28%	-5.6%
2000	39.49%	+0.4%
1999	39.33%	+46.5%
1998	26.84%	+171.9%
1997	-37.33%	-126.1%
1996	-16.51%	+77.4%
1995	-73.16%	+69.8%
1994	-242.25%	-246.8%
1993	-69.86%	+71.3%
1992	-243.75%	-162.9%
1991	-92.73%	-703.3%
1990	15.37%	+36.9%
1989	11.23%	+292.6%
1988	-5.83%	+97.8%
1987	-262.79%	+40.4%
1986	-440.63%	-248.4%
1985	-126.49%	-121.1%
1984	-57.21%	-

FAQ

What is the current annual net margin of BIIB?: As of today, BIIB annual net margin is 13.07%
What is 1-year change in BIIB annual net margin?: BIIB annual net margin is down -25.78% year-over-year
What is 3-year change in BIIB annual net margin?: BIIB annual net margin is down -58.36% over the past 3 years
How far is BIIB annual net margin from its all-time high?: BIIB annual net margin is currently -71.78% below its historical high of 46.32% set on December 31, 2019
How does BIIB annual net margin rank versus sector peers?: BIIB annual net margin is higher than 88.65% of companies in Healthcare sector
When is BIIB next annual earnings release?: The next annual earnings release for BIIB is on February 5, 2027

Net Margin Formula

Net Margin = Net Income

Revenue × 100%

Quarterly Net Margin

-0.77%4.49%-120.70%

September 30, 2026

Summary

Current Value: As of today, BIIB quarterly net margin is -0.77%, down -120.70% on September 30, 2026
Historical Performance: BIIB quarterly net margin is down -104.05% year-over-year, up +72.50% over the past 3 years
All-Time High Comparison: BIIB quarterly net margin is currently -101.10% below its historical high of 69.90% set on June 30, 1998
3-Year Low Comparison: BIIB quarterly net margin is +72.50% above its 3-year low of -2.80% reached on an earlier date
Sector Comparison: BIIB quarterly net margin is higher than 62.87% of companies in Healthcare sector

Performance

BIIB Performance
Metric	Date	Value	3M	1Y	3Y	5Y
Quarterly Net Margin	Sep 30, 26	-0.77%	-120.7%	-104.0%	+72.5%	-106.4%
Annual Net Margin	Dec 31, 25	13.07%	–	-25.8%	-58.4%	-60.2%
Price	Nov 6, 26	$248.35	+20.4%	+58.5%	-0.1%	-10.9%
PE Ratio	Nov 6, 26	106.31	+191.0%	+644.0%	+330.1%	+289.8%
Quarterly Revenue	Sep 30, 26	$2.69B	+2.6%	+9.6%	+10.5%	+1.6%
Quarterly Net Income	Sep 30, 26	-$20.60M	-121.1%	-104.4%	+69.8%	-106.5%
Quarterly Gross Margin	Sep 30, 26	63.23%	+3.0%	-1.6%	-6.7%	-16.4%
Quarterly Operating Margin	Sep 30, 26	16.50%	-1.3%	-34.0%	+111.3%	-38.7%

Quarterly Net Margin Highs

BIIB Quarterly Net Margin Highs Comparison
Period	High	Date	Current
1Y	19.00%	N/A	-104.0%
3Y	24.80%	Jun 30, 24	-103.1%
5Y	49.49%	Sep 30, 22	-101.6%
All	69.90%	Jun 30, 98	-101.1%

Quarterly Net Margin Lows

BIIB Quarterly Net Margin Lows Comparison
Period	Low	Date	Current
1Y	-2.24%	Dec 31, 25	+65.6%
3Y	-2.80%	N/A	+72.5%
5Y	-2.80%	Sep 30, 23	+72.5%
All	-1,071.43%	Sep 30, 86	+99.9%

Quarterly Net Margin History

Month	Value	Change
Sep 2026	-0.77%	-120.7%
Jun 2026	3.72%	-72.0%
Mar 2026	13.29%	+693.3%
Dec 2025	-2.24%	-111.8%
Sep 2025	19.00%	-23.3%
Jun 2025	24.78%	+140.6%
Mar 2025	10.30%	-9.7%
Dec 2024	11.41%	-30.2%
Sep 2024	16.35%	-34.1%
Jun 2024	24.80%	+38.7%
Mar 2024	17.88%	+65.2%
Dec 2023	10.82%	+486.4%
Sep 2023	-2.80%	-111.1%
Jun 2023	25.24%	+51.8%
Mar 2023	16.63%	-24.5%
Dec 2022	22.04%	-55.5%
Sep 2022	49.49%	+12.5%
Jun 2022	44.01%	+378.4%
Mar 2022	9.20%	+1,264.6%
Dec 2021	-0.79%	-106.6%
Sep 2021	12.01%	-69.2%
Jun 2021	39.03%	+140.6%
Mar 2021	16.22%	-57.8%
Dec 2020	38.42%	+70.2%
Sep 2020	22.57%	-52.2%
Jun 2020	47.22%	+7.0%
Mar 2020	44.12%	-0.2%
Dec 2019	44.21%	-9.3%
Sep 2019	48.75%	+4.6%
Jun 2019	46.60%	+1.9%
Mar 2019	45.73%	+52.4%
Dec 2018	30.01%	-35.8%
Sep 2018	46.71%	+53.1%
Jun 2018	30.50%	-26.7%
Mar 2018	41.60%	+850.9%
Dec 2017	-5.54%	-112.5%
Sep 2017	44.24%	+39.9%
Jun 2017	31.63%	+4.9%
Mar 2017	30.14%	+33.3%
Dec 2016	22.61%	-41.6%
Sep 2016	38.73%	-5.3%
Jun 2016	40.88%	+1.5%
Mar 2016	40.29%	+35.4%
Dec 2015	29.75%	-29.6%
Sep 2015	42.23%	+1.7%
Jun 2015	41.51%	+11.9%
Mar 2015	37.11%	+10.4%
Dec 2014	33.60%	-12.2%
Sep 2014	38.25%	+13.3%
Jun 2014	33.76%	+31.0%
Mar 2014	25.78%	-3.0%
Dec 2013	26.58%	-15.3%
Sep 2013	31.39%	-7.0%
Jun 2013	33.75%	-10.4%
Mar 2013	37.68%	+49.2%
Dec 2012	25.25%	-29.3%
Sep 2012	35.72%	+6.0%
Jun 2012	33.71%	+14.7%
Mar 2012	29.39%	+7.6%
Dec 2011	27.32%	-16.0%
Sep 2011	32.54%	+3.4%
Jun 2011	31.48%	-2.6%
Mar 2011	32.31%	+41.2%
Dec 2010	22.89%	+83.9%
Sep 2010	12.45%	-48.5%
Mar 2010	24.17%	-24.4%
Dec 2009	31.95%	+6.9%
Sep 2009	29.90%	+86.8%
Jun 2009	16.01%	-44.1%
Mar 2009	28.62%	+17.2%
Dec 2008	24.42%	-6.2%
Sep 2008	26.04%	+3.5%
Jun 2008	25.15%	+20.3%
Mar 2008	20.90%	-8.7%
Dec 2007	22.90%	+61.7%
Sep 2007	14.16%	-53.2%
Jun 2007	30.26%	+31.4%
Mar 2007	23.03%	+18.8%
Dec 2006	19.39%	-30.5%
Sep 2006	27.88%	+186.0%
Jun 2006	-32.41%	-230.7%
Mar 2006	24.80%	+125.7%
Dec 2005	10.99%	+89.2%
Sep 2005	5.81%	+2.1%
Jun 2005	5.69%	-22.9%

Month	Value	Change
Mar 2005	7.38%	+51.2%
Dec 2004	4.88%	-27.9%
Sep 2004	6.77%	+4,413.3%
Jun 2004	0.15%	+102.0%
Mar 2004	-7.60%	+97.7%
Dec 2003	-330.36%	-1,106.0%
Sep 2003	32.84%	+41.1%
Jun 2003	23.28%	-33.8%
Mar 2003	35.14%	-2.6%
Dec 2002	36.06%	-2.7%
Sep 2002	37.07%	-2.2%
Jun 2002	37.89%	-2.8%
Mar 2002	38.99%	+10.8%
Dec 2001	35.19%	-11.7%
Sep 2001	39.84%	-1.0%
Jun 2001	40.26%	+9.4%
Mar 2001	36.80%	-10.3%
Sep 2000	41.03%	+7.2%
Jun 2000	38.29%	+144.4%
Mar 2000	15.67%	-51.8%
Dec 1999	32.49%	-8.6%
Sep 1999	35.54%	-37.0%
Jun 1999	56.41%	+140.6%
Mar 1999	23.45%	-14.6%
Dec 1998	27.46%	-26.6%
Sep 1998	37.40%	-46.5%
Jun 1998	69.90%	+61.7%
Mar 1998	43.24%	+98.9%
Dec 1997	21.74%	+6.7%
Sep 1997	20.38%	-5.4%
Jun 1997	21.54%	+20.1%
Mar 1997	17.93%	+128.4%
Dec 1996	7.85%	-83.2%
Sep 1996	46.59%	+310.9%
Jun 1996	-22.09%	-105.3%
Mar 1996	-10.76%	-694.5%
Dec 1995	1.81%	-44.1%
Sep 1995	3.24%	+51.4%
Jun 1995	2.14%	-75.5%
Mar 1995	8.75%	-61.3%
Dec 1994	22.59%	+127.2%
Sep 1994	-83.02%	-4,636.6%
Jun 1994	1.83%	-93.3%
Mar 1994	27.18%	+127.8%
Dec 1993	11.93%	-64.2%
Sep 1993	33.33%	+106.5%
Jun 1993	16.14%	-53.6%
Mar 1993	34.77%	-30.3%
Dec 1992	49.90%	+70.4%
Sep 1992	29.29%	+656.8%
Jun 1992	3.87%	-22.1%
Mar 1992	4.97%	-23.4%
Dec 1991	6.49%	-4.0%
Sep 1991	6.76%	-55.0%
Jun 1991	15.03%	-17.6%
Mar 1991	18.24%	-3.2%
Dec 1990	18.84%	+30.8%
Sep 1990	14.40%	+8.0%
Jun 1990	13.33%	-7.5%
Mar 1990	14.41%	-32.4%
Dec 1989	21.33%	-12.2%
Sep 1989	24.29%	+937.6%
Jun 1989	-2.90%	-335.8%
Mar 1989	1.23%	-65.5%
Dec 1988	3.57%	-67.9%
Sep 1988	11.11%	+171.6%
Jun 1988	-15.52%	+3.4%
Mar 1988	-16.07%	+91.5%
Dec 1987	-188.89%	+51.4%
Sep 1987	-388.89%	-0.2%
Jun 1987	-388.24%	-121.9%
Mar 1987	-175.00%	+81.8%
Dec 1986	-962.50%	+10.2%
Sep 1986	-1,071.43%	-219.8%
Jun 1986	-335.00%	-48.9%
Mar 1986	-225.00%	-0.4%
Dec 1985	-224.14%	-86.8%
Sep 1985	-120.00%	-118.6%
Jun 1985	-54.90%	+67.1%
Mar 1985	-166.67%	-437.8%
Dec 1984	-30.99%	+34.7%
Sep 1984	-47.46%	+39.9%
Jun 1984	-78.95%	+7.9%
Mar 1984	-85.71%	-

FAQ

What is the current quarterly net margin of BIIB?: As of today, BIIB quarterly net margin is -0.77%
What is BIIB quarterly net margin most recent change?: BIIB quarterly net margin was down -120.70% on September 30, 2026
What is 1-year change in BIIB quarterly net margin?: BIIB quarterly net margin is down -104.05% year-over-year
How far is BIIB quarterly net margin from its all-time high?: BIIB quarterly net margin is currently -101.10% below its historical high of 69.90% set on June 30, 1998
How does BIIB quarterly net margin rank versus sector peers?: BIIB quarterly net margin is higher than 62.87% of companies in Healthcare sector
When is BIIB next earnings release?: The next earnings release for BIIB is on February 5, 2027

Net Margin Formula

Net Margin = Net Income

Revenue × 100%

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