Biogen (BIIB) seasonality heatmap
Returns across monthly, quarterly, and yearly periods. Cell color encodes signed magnitude; the scale auto-fits each table.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | +2.2% | +6.6% | -4.4% | +3.2% | +3.6% | +2.1% | — | — | — | — | — | — |
| 2025 | -5.9% | -2.4% | -2.6% | -11.5% | +7.2% | -3.2% | +1.9% | +3.3% | +5.9% | +10.1% | +18.0% | -3.3% |
| 2024 | -4.7% | -12.0% | -0.6% | -0.4% | +4.7% | +3.1% | -8.0% | -4.0% | -5.3% | -10.2% | -7.7% | -4.8% |
| 2023 | +5.0% | -7.2% | +3.0% | +9.4% | -2.6% | -3.9% | -5.1% | -1.0% | -3.9% | -7.6% | -1.5% | +10.5% |
| 2022 | -5.8% | -6.6% | -0.2% | -1.5% | -3.6% | +2.0% | +5.5% | -9.2% | +36.7% | +6.2% | +7.7% | -9.3% |
| 2021 | +15.4% | -3.4% | +2.5% | -4.4% | +0.1% | +29.5% | -5.6% | +3.7% | -16.5% | -5.8% | -11.6% | +1.8% |
| 2020 | -9.4% | +14.7% | +2.6% | -6.2% | +3.5% | -12.9% | +2.7% | +4.7% | -1.4% | -11.1% | -4.7% | +2.0% |
| 2019 | +10.9% | -1.7% | -27.9% | -3.0% | -4.3% | +6.6% | +1.7% | -7.6% | +5.9% | +28.3% | +0.4% | -1.0% |
| 2018 | +9.2% | -16.9% | -5.2% | -0.1% | +7.4% | -1.3% | +15.2% | +5.7% | -0.1% | -13.9% | +9.7% | -9.8% |
| 2017 | -2.2% | +4.1% | -5.3% | -0.8% | -8.6% | +9.5% | +6.7% | +9.3% | -1.1% | -0.5% | +3.4% | -1.1% |
| 2016 | -10.9% | -5.0% | +0.3% | +5.6% | +5.4% | -16.5% | +19.9% | +5.4% | +2.4% | -10.5% | +5.0% | -3.6% |
| 2015 | +14.6% | +5.2% | +3.1% | -11.4% | +6.2% | +1.8% | -21.1% | -6.7% | -1.8% | -0.4% | -1.3% | +6.8% |
| 2014 | +11.8% | +9.0% | -10.2% | -6.1% | +11.2% | -1.3% | +6.1% | +2.6% | -3.6% | -2.9% | -4.2% | +10.3% |
| 2013 | +6.6% | +6.6% | +15.8% | +13.7% | +8.5% | -9.4% | +1.4% | -2.3% | +13.0% | +1.4% | +19.2% | -3.9% |
| 2012 | +7.2% | -1.3% | +8.2% | +6.4% | -2.4% | +10.4% | +1.0% | +0.5% | +1.8% | -7.4% | +7.9% | -1.8% |
| 2011 | -2.4% | +4.5% | +7.4% | +32.9% | -3.0% | +12.9% | -4.7% | -7.5% | -1.1% | +24.9% | -1.2% | -4.3% |
| 2010 | +0.4% | +2.4% | +4.3% | -7.1% | -11.0% | +0.0% | +17.8% | -3.7% | +4.3% | +11.7% | +2.0% | +4.8% |
| 2009 | +2.1% | -5.4% | +13.9% | -7.8% | +7.1% | -12.8% | +5.3% | +5.6% | +0.6% | -16.6% | +11.4% | +14.0% |
| 2008 | +7.1% | -4.2% | +5.7% | -1.6% | +3.4% | -10.9% | +24.8% | -27.0% | -1.3% | -15.4% | -0.6% | +12.6% |
| 2007 | -1.7% | -6.5% | -1.8% | +6.4% | +10.6% | +2.5% | +5.7% | +12.9% | +3.9% | +12.2% | -0.4% | -23.2% |
| 2006 | -1.2% | +5.6% | -0.3% | -4.8% | +4.0% | -0.7% | -9.2% | +5.1% | +1.1% | +6.5% | +9.8% | -5.9% |
| 2005 | -2.5% | -40.5% | -10.7% | +5.0% | +7.9% | -11.9% | +14.0% | +7.3% | -6.3% | +2.9% | +5.4% | +5.8% |
| 2004 | +17.1% | +30.0% | -0.6% | +6.2% | +5.3% | +1.8% | -5.1% | -1.1% | +3.1% | -4.9% | +0.9% | +13.5% |
| 2003 | -3.3% | -10.4% | +19.0% | -4.3% | +16.7% | -11.1% | -0.6% | +2.8% | -4.1% | +5.6% | +8.7% | -3.9% |
| 2002 | -13.7% | +5.7% | +2.4% | -14.5% | -21.9% | -17.3% | +25.8% | -9.9% | +3.3% | +10.8% | -28.7% | +1.1% |
| 2001 | -6.9% | -4.1% | -29.1% | +23.0% | +25.2% | +9.9% | -20.3% | +9.8% | -16.4% | +21.0% | +17.2% | -1.9% |
| 2000 | +28.4% | +11.7% | -30.3% | -34.9% | -0.3% | +83.8% | +4.7% | +13.7% | +25.6% | +11.9% | -11.3% | +8.9% |
| 1999 | +7.5% | -14.3% | +18.6% | -1.2% | -0.6% | +52.7% | +28.7% | +28.2% | -26.0% | +23.5% | +9.1% | +55.0% |
| 1998 | +21.5% | +8.6% | -2.4% | -18.7% | -12.5% | -25.1% | +0.5% | -24.1% | +32.0% | +25.8% | +12.4% | +39.8% |
| 1997 | -2.0% | +7.0% | -4.3% | -25.4% | +26.7% | +7.7% | +12.4% | +11.5% | +37.9% | -9.0% | -8.3% | -1.5% |
| 1996 | +10.2% | -5.6% | +9.8% | +29.6% | -10.8% | -10.3% | -33.0% | +51.2% | +2.6% | -10.0% | +12.2% | -2.0% |
| 1995 | +20.6% | +46.3% | +0.0% | +6.7% | +12.5% | +25.0% | +20.5% | +1.8% | +13.9% | +51.1% | +15.7% | +41.9% |
| 1994 | +12.7% | -19.0% | -26.2% | -6.5% | +3.4% | -35.0% | +12.8% | +0.0% | -13.6% | +21.1% | -13.0% | -15.0% |
| 1993 | -19.9% | +0.0% | -18.1% | -17.4% | +18.4% | -2.2% | -31.8% | +40.0% | -4.8% | +12.5% | +6.7% | -4.2% |
| 1992 | +18.9% | -9.7% | -21.5% | -27.3% | +0.0% | -17.3% | +29.1% | -16.2% | -9.2% | +46.3% | +10.8% | -16.6% |
| 1991 | — | — | — | — | — | — | — | — | — | -1.6% | -35.1% | +8.5% |
| Avg | +3.9% | -0.2% | -2.4% | -2.0% | +3.4% | +1.6% | +3.5% | +3.1% | +2.3% | +5.9% | +1.8% | +3.4% |
| Median | +2.2% | -1.7% | -0.3% | -1.6% | +3.6% | -1.0% | +3.7% | +2.7% | +0.3% | +2.9% | +3.4% | -1.1% |
| Last 5Y Avg | -1.8% | -4.3% | -1.0% | -0.1% | +1.9% | +5.5% | -2.3% | -1.4% | +3.4% | -1.5% | +1.0% | -1.0% |
| Std Dev (σ) | 10.9% | 14.3% | 12.8% | 14.3% | 10.1% | 21.7% | 15.4% | 15.1% | 14.0% | 16.6% | 12.0% | 15.7% |
| Consistency (μ/σ) | 0.36 | -0.02 | -0.19 | -0.14 | 0.33 | 0.08 | 0.23 | 0.20 | 0.16 | 0.35 | 0.15 | 0.22 |
| Win Rate (%) | 57% | 43% | 43% | 34% | 63% | 47% | 68% | 59% | 50% | 54% | 60% | 46% |
| Winning / Losing Months | ▲20▼15 | ▲15▼20 | ▲15▼20 | ▲12▼23 | ▲22▼13 | ▲16▼18 | ▲23▼11 | ▲20▼14 | ▲17▼17 | ▲19▼16 | ▲21▼14 | ▲16▼19 |
| Longest Win / Loss Streak | ▲4▼3 | ▲3▼5 | ▲6▼4 | ▲3▼6 | ▲7▼3 | ▲3▼3 | ▲5▼2 | ▲3▼3 | ▲4▼3 | ▲6▼5 | ▲4▼2 | ▲3▼4 |
| Best | +28.4%in January 2000 | +46.3%in February 1995 | +19.0%in March 2003 | +32.9%in April 2011 | +26.7%in May 1997 | +83.8%in June 2000 | +29.1%in July 1992 | +51.2%in August 1996 | +37.9%in September 1997 | +51.1%in October 1995 | +19.2%in November 2013 | +55.0%in December 1999 |
| Worst | -19.9%in January 1993 | -40.5%in February 2005 | -30.3%in March 2000 | -34.9%in April 2000 | -21.9%in May 2002 | -35.0%in June 1994 | -33.0%in July 1996 | -27.0%in August 2008 | -26.0%in September 1999 | -16.6%in October 2009 | -35.1%in November 1991 | -23.2%in December 2007 |
−40.5%+83.8%
2026
Jan+2.2%
Feb+6.6%
Mar-4.4%
Apr+3.2%
May+3.6%
Jun+2.1%
Jul—
Aug—
Sep—
Oct—
Nov—
Dec—
2025
Jan-5.9%
Feb-2.4%
Mar-2.6%
Apr-11.5%
May+7.2%
Jun-3.2%
Jul+1.9%
Aug+3.3%
Sep+5.9%
Oct+10.1%
Nov+18.0%
Dec-3.3%
2024
Jan-4.7%
Feb-12.0%
Mar-0.6%
Apr-0.4%
May+4.7%
Jun+3.1%
Jul-8.0%
Aug-4.0%
Sep-5.3%
Oct-10.2%
Nov-7.7%
Dec-4.8%
2023
Jan+5.0%
Feb-7.2%
Mar+3.0%
Apr+9.4%
May-2.6%
Jun-3.9%
Jul-5.1%
Aug-1.0%
Sep-3.9%
Oct-7.6%
Nov-1.5%
Dec+10.5%
2022
Jan-5.8%
Feb-6.6%
Mar-0.2%
Apr-1.5%
May-3.6%
Jun+2.0%
Jul+5.5%
Aug-9.2%
Sep+36.7%
Oct+6.2%
Nov+7.7%
Dec-9.3%
2021
Jan+15.4%
Feb-3.4%
Mar+2.5%
Apr-4.4%
May+0.1%
Jun+29.5%
Jul-5.6%
Aug+3.7%
Sep-16.5%
Oct-5.8%
Nov-11.6%
Dec+1.8%
2020
Jan-9.4%
Feb+14.7%
Mar+2.6%
Apr-6.2%
May+3.5%
Jun-12.9%
Jul+2.7%
Aug+4.7%
Sep-1.4%
Oct-11.1%
Nov-4.7%
Dec+2.0%
2019
Jan+10.9%
Feb-1.7%
Mar-27.9%
Apr-3.0%
May-4.3%
Jun+6.6%
Jul+1.7%
Aug-7.6%
Sep+5.9%
Oct+28.3%
Nov+0.4%
Dec-1.0%
2018
Jan+9.2%
Feb-16.9%
Mar-5.2%
Apr-0.1%
May+7.4%
Jun-1.3%
Jul+15.2%
Aug+5.7%
Sep-0.1%
Oct-13.9%
Nov+9.7%
Dec-9.8%
2017
Jan-2.2%
Feb+4.1%
Mar-5.3%
Apr-0.8%
May-8.6%
Jun+9.5%
Jul+6.7%
Aug+9.3%
Sep-1.1%
Oct-0.5%
Nov+3.4%
Dec-1.1%
2016
Jan-10.9%
Feb-5.0%
Mar+0.3%
Apr+5.6%
May+5.4%
Jun-16.5%
Jul+19.9%
Aug+5.4%
Sep+2.4%
Oct-10.5%
Nov+5.0%
Dec-3.6%
2015
Jan+14.6%
Feb+5.2%
Mar+3.1%
Apr-11.4%
May+6.2%
Jun+1.8%
Jul-21.1%
Aug-6.7%
Sep-1.8%
Oct-0.4%
Nov-1.3%
Dec+6.8%
2014
Jan+11.8%
Feb+9.0%
Mar-10.2%
Apr-6.1%
May+11.2%
Jun-1.3%
Jul+6.1%
Aug+2.6%
Sep-3.6%
Oct-2.9%
Nov-4.2%
Dec+10.3%
2013
Jan+6.6%
Feb+6.6%
Mar+15.8%
Apr+13.7%
May+8.5%
Jun-9.4%
Jul+1.4%
Aug-2.3%
Sep+13.0%
Oct+1.4%
Nov+19.2%
Dec-3.9%
2012
Jan+7.2%
Feb-1.3%
Mar+8.2%
Apr+6.4%
May-2.4%
Jun+10.4%
Jul+1.0%
Aug+0.5%
Sep+1.8%
Oct-7.4%
Nov+7.9%
Dec-1.8%
2011
Jan-2.4%
Feb+4.5%
Mar+7.4%
Apr+32.9%
May-3.0%
Jun+12.9%
Jul-4.7%
Aug-7.5%
Sep-1.1%
Oct+24.9%
Nov-1.2%
Dec-4.3%
2010
Jan+0.4%
Feb+2.4%
Mar+4.3%
Apr-7.1%
May-11.0%
Jun+0.0%
Jul+17.8%
Aug-3.7%
Sep+4.3%
Oct+11.7%
Nov+2.0%
Dec+4.8%
2009
Jan+2.1%
Feb-5.4%
Mar+13.9%
Apr-7.8%
May+7.1%
Jun-12.8%
Jul+5.3%
Aug+5.6%
Sep+0.6%
Oct-16.6%
Nov+11.4%
Dec+14.0%
2008
Jan+7.1%
Feb-4.2%
Mar+5.7%
Apr-1.6%
May+3.4%
Jun-10.9%
Jul+24.8%
Aug-27.0%
Sep-1.3%
Oct-15.4%
Nov-0.6%
Dec+12.6%
2007
Jan-1.7%
Feb-6.5%
Mar-1.8%
Apr+6.4%
May+10.6%
Jun+2.5%
Jul+5.7%
Aug+12.9%
Sep+3.9%
Oct+12.2%
Nov-0.4%
Dec-23.2%
2006
Jan-1.2%
Feb+5.6%
Mar-0.3%
Apr-4.8%
May+4.0%
Jun-0.7%
Jul-9.2%
Aug+5.1%
Sep+1.1%
Oct+6.5%
Nov+9.8%
Dec-5.9%
2005
Jan-2.5%
Feb-40.5%
Mar-10.7%
Apr+5.0%
May+7.9%
Jun-11.9%
Jul+14.0%
Aug+7.3%
Sep-6.3%
Oct+2.9%
Nov+5.4%
Dec+5.8%
2004
Jan+17.1%
Feb+30.0%
Mar-0.6%
Apr+6.2%
May+5.3%
Jun+1.8%
Jul-5.1%
Aug-1.1%
Sep+3.1%
Oct-4.9%
Nov+0.9%
Dec+13.5%
2003
Jan-3.3%
Feb-10.4%
Mar+19.0%
Apr-4.3%
May+16.7%
Jun-11.1%
Jul-0.6%
Aug+2.8%
Sep-4.1%
Oct+5.6%
Nov+8.7%
Dec-3.9%
2002
Jan-13.7%
Feb+5.7%
Mar+2.4%
Apr-14.5%
May-21.9%
Jun-17.3%
Jul+25.8%
Aug-9.9%
Sep+3.3%
Oct+10.8%
Nov-28.7%
Dec+1.1%
2001
Jan-6.9%
Feb-4.1%
Mar-29.1%
Apr+23.0%
May+25.2%
Jun+9.9%
Jul-20.3%
Aug+9.8%
Sep-16.4%
Oct+21.0%
Nov+17.2%
Dec-1.9%
2000
Jan+28.4%
Feb+11.7%
Mar-30.3%
Apr-34.9%
May-0.3%
Jun+83.8%
Jul+4.7%
Aug+13.7%
Sep+25.6%
Oct+11.9%
Nov-11.3%
Dec+8.9%
1999
Jan+7.5%
Feb-14.3%
Mar+18.6%
Apr-1.2%
May-0.6%
Jun+52.7%
Jul+28.7%
Aug+28.2%
Sep-26.0%
Oct+23.5%
Nov+9.1%
Dec+55.0%
1998
Jan+21.5%
Feb+8.6%
Mar-2.4%
Apr-18.7%
May-12.5%
Jun-25.1%
Jul+0.5%
Aug-24.1%
Sep+32.0%
Oct+25.8%
Nov+12.4%
Dec+39.8%
1997
Jan-2.0%
Feb+7.0%
Mar-4.3%
Apr-25.4%
May+26.7%
Jun+7.7%
Jul+12.4%
Aug+11.5%
Sep+37.9%
Oct-9.0%
Nov-8.3%
Dec-1.5%
1996
Jan+10.2%
Feb-5.6%
Mar+9.8%
Apr+29.6%
May-10.8%
Jun-10.3%
Jul-33.0%
Aug+51.2%
Sep+2.6%
Oct-10.0%
Nov+12.2%
Dec-2.0%
1995
Jan+20.6%
Feb+46.3%
Mar+0.0%
Apr+6.7%
May+12.5%
Jun+25.0%
Jul+20.5%
Aug+1.8%
Sep+13.9%
Oct+51.1%
Nov+15.7%
Dec+41.9%
1994
Jan+12.7%
Feb-19.0%
Mar-26.2%
Apr-6.5%
May+3.4%
Jun-35.0%
Jul+12.8%
Aug+0.0%
Sep-13.6%
Oct+21.1%
Nov-13.0%
Dec-15.0%
1993
Jan-19.9%
Feb+0.0%
Mar-18.1%
Apr-17.4%
May+18.4%
Jun-2.2%
Jul-31.8%
Aug+40.0%
Sep-4.8%
Oct+12.5%
Nov+6.7%
Dec-4.2%
1992
Jan+18.9%
Feb-9.7%
Mar-21.5%
Apr-27.3%
May+0.0%
Jun-17.3%
Jul+29.1%
Aug-16.2%
Sep-9.2%
Oct+46.3%
Nov+10.8%
Dec-16.6%
1991
Jan—
Feb—
Mar—
Apr—
May—
Jun—
Jul—
Aug—
Sep—
Oct-1.6%
Nov-35.1%
Dec+8.5%
Avg
Jan+3.9%
Feb-0.2%
Mar-2.4%
Apr-2.0%
May+3.4%
Jun+1.6%
Jul+3.5%
Aug+3.1%
Sep+2.3%
Oct+5.9%
Nov+1.8%
Dec+3.4%
Median
Jan+2.2%
Feb-1.7%
Mar-0.3%
Apr-1.6%
May+3.6%
Jun-1.0%
Jul+3.7%
Aug+2.7%
Sep+0.3%
Oct+2.9%
Nov+3.4%
Dec-1.1%
Last 5Y Avg
Jan-1.8%
Feb-4.3%
Mar-1.0%
Apr-0.1%
May+1.9%
Jun+5.5%
Jul-2.3%
Aug-1.4%
Sep+3.4%
Oct-1.5%
Nov+1.0%
Dec-1.0%
Std Dev (σ)
Jan10.9%
Feb14.3%
Mar12.8%
Apr14.3%
May10.1%
Jun21.7%
Jul15.4%
Aug15.1%
Sep14.0%
Oct16.6%
Nov12.0%
Dec15.7%
Consistency (μ/σ)
Jan0.36
Feb-0.02
Mar-0.19
Apr-0.14
May0.33
Jun0.08
Jul0.23
Aug0.20
Sep0.16
Oct0.35
Nov0.15
Dec0.22
Win Rate (%)
Jan57%
Feb43%
Mar43%
Apr34%
May63%
Jun47%
Jul68%
Aug59%
Sep50%
Oct54%
Nov60%
Dec46%
Winning / Losing Months
Jan▲20▼15
Feb▲15▼20
Mar▲15▼20
Apr▲12▼23
May▲22▼13
Jun▲16▼18
Jul▲23▼11
Aug▲20▼14
Sep▲17▼17
Oct▲19▼16
Nov▲21▼14
Dec▲16▼19
Longest Win / Loss Streak
Jan▲4▼3
Feb▲3▼5
Mar▲6▼4
Apr▲3▼6
May▲7▼3
Jun▲3▼3
Jul▲5▼2
Aug▲3▼3
Sep▲4▼3
Oct▲6▼5
Nov▲4▼2
Dec▲3▼4
Best
Jan+28.4%2000
Feb+46.3%1995
Mar+19.0%2003
Apr+32.9%2011
May+26.7%1997
Jun+83.8%2000
Jul+29.1%1992
Aug+51.2%1996
Sep+37.9%1997
Oct+51.1%1995
Nov+19.2%2013
Dec+55.0%1999
Worst
Jan-19.9%1993
Feb-40.5%2005
Mar-30.3%2000
Apr-34.9%2000
May-21.9%2002
Jun-35.0%1994
Jul-33.0%1996
Aug-27.0%2008
Sep-26.0%1999
Oct-16.6%2009
Nov-35.1%1991
Dec-23.2%2007
−40.5%+83.8%
Frequently asked questions
Data & methodology
Biogen (BIIB) Key Financials
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Income Statement
Balance Sheet
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Deep-dives across the income statement, cash flow, capital return, and valuation
Overview
Income Statement
Capital Return