BIIB

Biogen Inc. $252.73 as of 2026-10-27
Model view — historical tendencies for the days ahead, not a forecast
Next 1 day
-0.2%
Next 1 week
-0.1%
Next 1 month
+0.7%
Seasonality
Bullish window historically
Next 30 days (to Nov 27): +4.0% median, 59% of the last 34 years finished up.
20-year seasonality chart →
Mean reversion
Neutral — RSI(2) at 77
RSI(2) under 15 is oversold (this name has historically bounced); over 85 is overbought. Its dip-buy edge in history is -0.17%/day.
Mean-reversion stats →
1-month breakdown — Market · β 0.27 +0.7% · Seasonal tilt -0.0%
$36.8B market cap (#452 US) $302M/day volume 34% volatility +69% 1-year -47% from ATH
52-week range · 99% of the way up · -1% from the high
$138.00$254.41

Congressional trades in BIIB Full tracker →

26 members · 47 buys / 48 sells · $382K–$2.0M disclosed · latest filing Oct 7, 2026.

SELL MS Maria Elvira Salazar · traded Sep 24, 2026 $1K–$15K
SELL KH Kevin Hern · traded Aug 18, 2026 $1K–$15K
BUY AA Alan Armstrong · traded Mar 27, 2026 $1K–$15K
SELL MS Maria Elvira Salazar · traded Jun 2, 2026 $15K–$50K
BUY GC Gilbert Cisneros · traded Jun 5, 2026 $1K–$15K
BUY MS Maria Elvira Salazar · traded May 12, 2026 $1K–$15K
BUY MS Maria Elvira Salazar · traded May 11, 2026 $50K–$100K
BUY MS Maria Elvira Salazar · traded May 11, 2026 $1K–$15K
BUY GC Gilbert Cisneros · traded Jan 30, 2026 $1K–$15K
BUY RB Rob Bresnahan · traded May 15, 2025 $1K–$15K
SELL RB Rob Bresnahan · traded Apr 8, 2025 $1K–$15K
BUY RB Rob Bresnahan · traded Feb 25, 2025 $1K–$15K
SELL DG Daniel Goldman · traded Mar 6, 2023 $1K–$15K
SELL ST Shri Thanedar · traded Jan 23, 2023 $15K–$50K
SELL KM Kathy Manning · traded Aug 3, 2022 $1K–$15K
BUY KM Kathy Manning · traded Jul 20, 2022 $1K–$15K
SELL JG Josh Gottheimer · traded Mar 17, 2022 $1K–$15K
BUY JG Josh Gottheimer · traded Jan 10, 2022 $1K–$15K
SELL KM Kathy Manning · traded Jan 14, 2022 $1K–$15K
SELL JG Josh Gottheimer · traded Dec 9, 2021 $1K–$15K
BUY JG Josh Gottheimer · traded Oct 18, 2021 $1K–$15K
SELL JG Josh Gottheimer · traded Sep 15, 2021 $1K–$15K
BUY JG Josh Gottheimer · traded Jun 8, 2021 $1K–$15K
SELL PM Peter Meijer · traded Feb 16, 2021 $15K–$50K
SELL CJ Christopher L. Jacobs · traded Jan 4, 2021 $1K–$15K
SELL GC Gilbert Cisneros · traded Dec 22, 2020 $1K–$15K
BUY GC Gilbert Cisneros · traded Sep 16, 2020 $1K–$15K
BUY JG Josh Gottheimer · traded Jul 7, 2020 $1K–$15K
BUY GC Gilbert Cisneros · traded Apr 29, 2020 $1K–$15K
SELL DS Donna Shalala · traded Jun 24, 2019 $1K–$15K
SELL GC Gilbert Cisneros · traded Mar 18, 2020 $1K–$15K
BUY GC Gilbert Cisneros · traded Feb 7, 2020 $1K–$15K
SELL DP Dean Phillips sT · traded Sep 11, 2019 $1K–$15K
SELL DP Dean Phillips sT · traded Aug 13, 2019 $1K–$15K
BUY DP Dean Phillips sT · traded Jun 20, 2019 $1K–$15K
SELL GC Gilbert Cisneros · traded May 9, 2019 $1K–$15K
SELL DP Dean Phillips sT · traded May 13, 2019 $1K–$15K
SELL SW Sheldon Whitehouse · traded Mar 22, 2019 $1K–$15K
SELL NT Nicholas Van Taylor · traded Mar 25, 2019 $1K–$15K
SELL JG Josh Gottheimer · traded Oct 29, 2018 $1K–$15K
SELL GP Gary Palmer · traded Oct 5, 2018 $1K–$15K
BUY JG Josh Gottheimer · traded Jul 24, 2018 $1K–$15K
BUY GP Gary Palmer · traded Apr 4, 2017 $1K–$15K
BUY GP Gary Palmer · traded Aug 6, 2018 $1K–$15K
BUY TM Thomas MacArthur · traded May 2, 2018 $1K–$15K
SELL SW Sheldon Whitehouse · traded Jan 8, 2018 $1K–$15K
SELL LS Lamar Smith · traded Mar 29, 2017 $1K–$15K
SELL CB Cheri Bustos · traded Jan 30, 2017 $15K–$50K
SELL SW Sheldon Whitehouse · traded Dec 13, 2016 $15K–$50K
SELL SW Sheldon Whitehouse · traded Dec 23, 2016 $1K–$15K
BUY TM Thomas MacArthur · traded Dec 8, 2016 $1K–$15K
BUY SW Sheldon Whitehouse · traded Aug 4, 2015 $1K–$15K
BUY SW Sheldon Whitehouse · traded Aug 10, 2015 $1K–$15K
BUY SW Sheldon Whitehouse · traded Aug 4, 2015 $1K–$15K
BUY SW Sheldon Whitehouse · traded Aug 10, 2015 $1K–$15K
SELL JI James M Inhofe · traded Jul 21, 2016 $50K–$100K
SELL EW Ed Whitfield · traded Jun 3, 2016 $1K–$15K
SELL KC K. Michael Conaway · traded Apr 1, 2016 $1K–$15K
SELL EW Ed Whitfield · traded Apr 13, 2016 $1K–$15K
BUY EW Ed Whitfield · traded Feb 4, 2016 $1K–$15K

Showing the 60 most recent filings of 95 — full tracker.

Earnings Full history →

Next report 2026-10-28 (Wednesday, before open, in 0 days) · EPS est. 1.99.

1-day std dev
6.1%
Finished up
57%
Biggest pop
+26.1%
Biggest drop
-22.1%

Standard deviation of the close-to-close move over the last 60 reports. History, not a forecast.

ReportedEst.Actual SurpriseGap Day 1Day 5
2026-07-29 beat 2.03 3.60 +77.4% +2.4% +1.8% +0.5%
2026-04-29 beat 2.95 3.57 +20.9% -0.1% +6.0% +4.0%
2026-02-06 beat 1.62 1.99 +23.2% +0.9% +8.5% +6.0%
2025-10-30 beat 3.88 4.81 +23.9% -5.2% +1.2% +6.0%
2025-07-31 beat 3.88 5.47 +41.0% +5.0% +1.1% +0.9%
2025-05-01 beat 2.95 3.02 +2.4% -0.6% -0.1% -2.2%
2025-02-12 beat 3.36 3.44 +2.3% -1.9% -4.3% -1.7%
2024-10-30 beat 3.79 4.08 +7.8% +0.6% -1.2% -4.9%
2024-08-01 beat 4.03 5.28 +31.0% +1.2% -1.2% -4.3%
2024-04-24 beat 3.46 3.67 +6.0% +3.0% +4.6% +11.9%
2024-02-13 miss 3.18 2.95 -7.2% -3.7% -7.4% -9.7%
2023-11-08 beat 3.98 4.36 +9.4% +0.0% -5.7% -6.5%
2023-07-25 beat 3.76 4.02 +6.9% +1.0% -2.4% -2.8%
2023-04-25 beat 3.28 3.40 +3.5% -0.7% -3.6% +5.5%
2023-02-15 beat 3.48 4.05 +16.2% -0.4% -3.5% -5.9%
2022-10-25 beat 4.13 4.77 +15.5% +1.4% -0.4% +2.0%
2022-07-20 beat 4.07 5.25 +29.0% -1.5% -5.8% -3.3%
2022-05-03 miss 4.36 3.62 -17.0% +0.9% -0.8% -5.9%
2022-02-03 beat 3.37 3.39 +0.6% -4.4% -2.1% -2.2%
2021-10-20 beat 4.10 4.77 +16.5% +0.7% -0.6% -3.1%
2021-07-22 beat 4.60 5.68 +23.5% -0.9% +1.1% +1.9%
2021-04-22 beat 4.94 5.34 +8.1% -3.7% -4.0% -1.7%
2021-02-03 miss 4.80 4.58 -4.5% -2.8% -5.2% -1.0%
2020-10-21 beat 8.05 8.84 +9.8% -0.8% +0.7% -8.6%
2020-07-22 beat 8.00 10.26 +28.2% +1.8% +0.2% -1.0%
2020-04-22 beat 7.69 9.14 +18.9% -8.0% -9.4% -7.4%
2020-01-30 beat 8.08 8.34 +3.3% +2.0% -1.8% +19.4%
2019-10-22 beat 8.27 9.17 +10.8% +38.7% +26.1% +33.1%
2019-07-23 beat 7.53 9.15 +21.4% +2.8% +4.9% +3.9%
2019-04-24 beat 6.96 6.98 +0.3% +0.8% -2.5% -0.3%
2019-01-29 beat 6.72 6.99 +4.0% -0.9% +1.4% +2.1%
2018-10-23 beat 6.76 7.40 +9.4% -0.2% +0.2% -2.9%
2018-07-24 beat 5.14 5.80 +12.7% +6.1% +4.1% -6.6%
2018-04-24 beat 5.94 6.05 +1.9% -2.2% +1.1% +5.9%
2018-01-25 miss 5.45 5.26 -3.5% +3.3% +2.1% -0.1%
2017-10-24 beat 5.72 6.31 +10.3% -2.9% -3.9% -5.1%
2017-07-25 beat 4.37 5.04 +15.3% +1.9% -0.6% +2.3%
2017-04-25 beat 4.97 5.20 +4.5% +4.7% +3.6% -2.0%
2017-01-26 beat 4.96 5.04 +1.6% +1.7% +2.1% -3.3%
2016-10-26 beat 4.97 5.19 +4.4% +3.1% +3.7% -3.1%
2016-07-21 beat 4.69 5.21 +11.2% +6.6% +7.6% +10.1%
2016-04-21 beat 4.47 4.79 +7.2% +1.1% +5.2% +5.7%
2016-01-27 beat 4.08 4.50 +10.3% +5.8% +5.2% +4.1%
2015-10-21 beat 3.81 4.48 +17.6% +7.2% +4.0% +10.5%
2015-07-24 beat 4.09 4.22 +3.1% -15.1% -22.1% -17.2%
2015-04-24 miss 3.90 3.82 -2.0% -4.7% -6.6% -10.2%
2015-01-29 beat 3.77 4.09 +8.4% +5.5% +10.2% +13.8%
2014-10-22 beat 3.46 3.80 +9.8% -8.2% -5.4% -3.6%
2014-07-23 beat 2.84 3.49 +22.8% +10.3% +11.2% +13.5%
2014-04-23 miss 2.55 2.47 -3.3% +0.9% +0.2% -6.2%
2014-01-29 beat 2.27 2.34 +3.0% -2.2% -0.1% -1.9%
2013-10-28 beat 2.11 2.35 +11.5% -0.7% +0.9% -4.8%
2013-07-25 beat 1.95 2.30 +17.7% +3.1% +0.4% -2.8%
2013-04-25 beat 1.63 1.97 +21.1% +2.9% +4.8% +5.4%
2013-01-28 miss 1.46 1.40 -4.0% +2.4% +2.6% +6.5%
2012-10-25 beat 1.60 1.91 +19.4% +2.1% +1.7% -1.7%
2012-07-24 beat 1.57 1.82 +16.2% +2.4% +0.2% +4.7%
2012-05-01 miss 1.48 1.40 -5.6% -1.8% -1.6% -0.8%
2012-01-31 beat 1.49 1.51 +1.4% -0.5% +1.2% +4.3%
2011-10-28 beat 1.53 1.61 +5.5% +0.0% +0.8% -3.6%
Posted about BIIB See all ›
TRACKER - Analyst Ratings long 234.24 Mon, 12 Oct JP Morgan upgraded BIIB. The move: JP Morgan upgraded BIIB: Neutral to Overweight with a $300 target, on 12 October 2026. The price: shown for… TRACKER - Analyst Ratings long 210.65 Fri, 14 Aug Wolfe Research upgraded BIIB, Peer Perform to Outperform with a $300 target, on 13 August 2026. The price shown is where BIIB closed that day, for… TRACKER - Gilbert Cisneros · Congress long 208.46 Mon, 06 Jul Gilbert Cisneros's trade date was 5 June 2026 — a disclosed purchase of $1,001–$15,000. But a Periodic Transaction Report gives a date and a size… TRACKER - Maria Elvira Salazar · Congress long 199.10 Tue, 09 Jun Maria Elvira Salazar's trade date was 11 May 2026 — a disclosed purchase of $50,001–$100,000. But a Periodic Transaction Report gives a date and a…

Not investment advice.