When NDX Drops Big On A Day SPX Posts An Intraday High

By Rob Hanna

[biiwii comment: Very pleased to welcome Quant Edges to our list of quality authors!]

It was interesting that the new intraday high Wednesday for SPX came on a day when NDX had its worst day since August. The study below looks at other instances of a 50-day high for SPX and the biggest drop in 50-days for NDX.


Results are fairly impressive, and suggest a bullish edge based on limited instances. It is notable that every instance had a run-up of at least 4.8%, and the largest drawdown was under 3.2%. So yesterday’s SPX/NDX action appears to be potentially favorable for the intermediate-term.

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