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Biogen Inc BIIB 254.46 5.53 2.22%

Previous-day view · Wed Nov 4 close. You are previewing the previous trading day. Subscribe to see today live and every other date — Trader is $59/mo. Sign up Sign in

Expected move

November 04, 2026 close · $254.50
Horizon Expected move Typical range 2 in 3 closes 9 in 10 closes
Next session ±1.6% ±$4.17 $250.33 – $258.67 $249.49 – $259.51 $245.54 – $263.46
2 sessions ±2.3% ±$5.80 $248.70 – $260.30 $247.48 – $261.52 $241.98 – $267.02
3 sessions ±2.9% ±$7.30 $247.20 – $261.80 $245.77 – $263.23 $238.95 – $270.05
1 week ±3.6% ±$9.29 $245.21 – $263.79 $243.15 – $265.85 $234.73 – $274.27
2 weeks ±5.0% ±$12.75 $241.75 – $267.25 $238.72 – $270.28 $227.29 – $281.71
3 weeks ±6.2% ±$15.70 $238.80 – $270.20 $234.95 – $274.05 $221.29 – $287.71
1 month ±9.2% ±$23.34 $231.16 – $277.84 $225.39 – $283.62 $205.03 – $303.98
Size, not direction. The 68% and 90% bands held 66–68% and 89–90% of closes in held-out years 2019–2026. Draw the cone on the chart →

Volatility premium

Beta
The forecast is for the current session, which this plan does not open.

Earnings: priced against what happened

Average implied move
±5.11%
Average actual move
3.60%
Beyond the implied move
2 / 7
Median IV change
-19.25%
Reaction session Implied Actual Used ATM IV before → after
October 28, 2026 ±5.68% -3.43% 0.60× —
July 29, 2026 ±4.69% +1.76% 0.38× —
April 29, 2026 ±4.80% +6.00% 1.25× —
February 06, 2026 ±4.88% +8.53% 1.75× —
July 31, 2025 ±4.56% +1.07% 0.24× 42.9% → 35.7%
May 01, 2025 ±5.43% -0.12% 0.02× —
February 12, 2025 ±5.74% -4.28% 0.75× 45.3% → 35.4%
Reconstructed from archived mid quotes; the straddle covers its expiration, not only the reaction session. These are not option returns. Method and missing reports →