Economist; founder of Trendex Research
Edwin S. C. Coppock
Edwin Sedgwick 'Sedge' Coppock was an American economist and founder of Trendex Research in San Antonio, Texas. He designed the Coppock Curve (originally the 'Trendex Model') to spot long-term buying opportunities in broad US stock indices after major declines, and published it in Barron's.
What they argue
- Recovering from a market decline is like recovering from a bereavement; he reportedly took the 11- and 14-month look-back periods from Episcopal bishops' estimate of how long mourning normally lasts.
- The indicator is for finding major long-term buy points in broad indices after bear markets, not for selling or short-term trading.
Sources
Wikipedia: Coppock curveStockCharts ChartSchool: Coppock CurveVan Tharp Institute: 'A Long-Term Indicator with a Surprising Following' (D.R. Barton)
Summaries are Be The Puck's paraphrase of public material. Be The Puck has no affiliation with the people listed.
Coppock curve
Rule and full recordMomentum · month-end
A monthly momentum line built to spot the end of bear markets. The buy signal is the curve turning up from below zero.
In right now297 of 377As of the Oct 13, 2026 close.
Best risk-adjusted results against buy and hold: