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.
IBM seasonality — common questions
What is IBM's best month historically?
Historically, November has been IBM's strongest month, averaging +4.15% with a 80% win rate over 15 years of data. October has been the weakest at -2.65%.
Is IBM seasonal?
IBM shows a measurable seasonal pattern: its best and worst months differ by 6.80 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 IBM historically perform in October?
IBM is currently in October, which has historically averaged -2.65% with a 38% win rate. That has historically been a seasonally weak window.
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