These figures are computed from 15 years of actual monthly closing prices. Past seasonal patterns are not a guarantee of future performance. See our methodology for how this is calculated, or visit the Academy to learn how to read seasonal data responsibly.
Biogen seasonality — common questions
What is Biogen's best month historically?
Historically, January has been Biogen's strongest month, averaging +2.62% with a 56% win rate over 15 years of data. March has been the weakest at -0.85%.
Is Biogen seasonal?
Biogen shows a measurable seasonal pattern: its best and worst months differ by 3.47 percentage points on average. These figures come from 15 years of real monthly closing prices. Seasonality is a historical tendency, not a prediction.
How does Biogen historically perform in August?
Biogen is currently in August, which has historically averaged -0.31% with a 50% win rate. That is a historically neutral window.
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