I ran a study on the Nasdaq 100 tonight to find instances where the index gapped higher by 1% or more and then closed lower on the day. I wanted to see whether the negativity tended to carry through to the next day or next several days. Here’s what I found.
Going back to 1986, the NDX has had 52 occurrences where the market gapped up over 1% and then finished negative on the day. It closed higher the next day 54% of the time. The chance of the NDX being up on any day over the period was also 54%. Over the next 3 and 5 days the chances of the market being higher were 62% and 65% after a large failed gap up. The NDX has closed higher between 55.5% and 56.5% of the time over all 3 and 5 days periods since 1986. So looking out over three and five days the supposedly negative reversal actually seems to be a positive for the market.
Even more compelling is the average gains realized over the period. For the 1-day following the occurrence, the market gained on average 0.4%. An average day in the NDX since 1986 saw a gain of 0.06% - much lower. An average week for the NDX was about a 0.3% gain. The average week after the failed gap up? A 1.3% gain.
If you thought today looked bad and you were worried about the market going forward because of it – you shouldn’t be.