Guides
How to judge a stock-pick track record before you trust it, with numbers from our own research.
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How to check a stock picker's track record
Five checks before you pay for picks, and the red flags that sink most self-reported records.
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How long must a track record be to prove skill, not luck?
With a 1%-a-month edge, 8 to 19 years of monthly results before luck is ruled out, and far longer if it was the best of several tries.
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Survivorship bias in backtesting: a worked example
Putting delisted companies back cut an insider-buying edge from +0.39% to +0.16% a month, and it stopped being significant.
Looking for records rather than explanations? Audits and tracked records lists our audits of viral strategies and every seller who enrolled.