2026 Edition, Updated and Expanded
The 100-Year Pattern
How Data Science Unlocks Wall Street's Seasonal Calendar
Foreword by David M. Aferiat, Co-Founder of Trade Ideas LLC
How Data Science Unlocks Wall Street's Seasonal Calendar
Foreword by David M. Aferiat, Co-Founder of Trade Ideas LLC
Afshin doesn't just describe market patterns. He reveals a hidden structure that's been shaping price action for over a century. His breakthrough is not just conceptual, it's practical. Through TradeWave, he gives you access to the data, the tools, and the time-tested windows that let you map your trading fingerprint.
David M. Aferiat
Co-Founder, Trade Ideas LLC · Founder & CEO, The Avid Group
Earlier printings said I could not find anyone who had documented this pattern. That was wrong.
Jeffrey Hirsch and the Stock Trader's Almanac have published a quarterly version, which they call the Sweet Spot, for years. I missed it because the Almanac is a print product and the research tools I used do not index print. That is a real limitation, not an excuse.
Chapter 7 is corrected and now states what the actual contribution is: the Almanac's tradeable figures begin in 1949, this record begins in 1930 and includes the only cycle that failed, and the window here is measured to the day rather than by quarter.
Nobody asked me to make this change.
Afshin Moshrefi
Corrected in the current printing, August 2026.
This is not a prediction book. It is a probability book. What history gives us is context: what is typical, what is rare, and what deserves special respect.
Nearly a century of usable seasonal history. When you have that much data, patterns don't need to be mystical. They either show up repeatedly or they don't.
A seasonal window starting September 27 that has failed once in 24 complete cycles going back to 1930. The book explains what it means and why 2026 matters.
Learn how to work with the Opportunity Table, Trend Chart, and TradeWave Ratio (TWR), and how to align these tools with a strategy that suits you.
Real-world repetition results, curated high-quality patterns, Buy & Hold vs. seasonal windows, futures & commodities examples, and a shareable opportunity template.
One of the most important dates in this book. It marks the beginning of the 100-Year Pattern, a seasonal window that has been one of the most consistent rhythms in nearly a century of market data.
Download the free preview including the Introduction and Chapter 7, or get the full book on Amazon.