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.
GSK seasonality — common questions
What is GSK's best month historically?
Historically, April has been GSK's strongest month, averaging +2.30% with a 69% win rate over 15 years of data. August has been the weakest at -1.34%.
Is GSK seasonal?
GSK shows a measurable seasonal pattern: its best and worst months differ by 3.64 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 GSK historically perform in August?
GSK is currently in August, which has historically averaged -1.34% with a 44% win rate. That has historically been a seasonally weak window.
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