Intraday Performance After A Massive Gap Down

As I write this in the middle of the night, the S&P 500 futures are down between 4% – 5%. A 4% gap down for the SPY is very rare. Below is a list of all other times it has happened since its inception in 1993.

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It does not appear as though panic selling at the open would be wise. There seems to be a strong upside edge for this one day. Of course the sample size is low and anything could happen in such a highly charged environment.  But this study certainly suggests an upside edge should a 4% gap down actually materialize.

 

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About the author:

Rob Hanna is the founder of Quantifiable Edges, a quantitative market research service he has run since 2008. His research focuses on statistical analysis of U.S. equity markets. In 2009 he published "The Quantifiable Edges Guide to Fed Days," available on Amazon. He was named the 2024 recipient of the National Association of Active Investment Managers (NAAIM) Founders Award and has since joined the NAAIM Board of Directors. Rob also works with Capital Advisors 360 as an investment advisor representative, where he utilizes quantitative and volatility-based models. Follow him on X / Bluesky / StockTwits / Facebook / Substack