Third-quarter earnings season kicks off after tomorrow's close when Alcoa (AA) reports. Below is a chart of the S&P 500 (with earnings seasons highlighted in gray) going back to the start of the bull market (we use the time period between Alcoa's report date and Wal-Mart's report date as our earnings season). Based on our calculations, the cumulative gain of the S&P 500 during earnings season is 9.7% since October 2002, while the cumulative gain during the earnings off-season is 53.4%. We're open to any thoughts of why this is so in the comments section.














Quite simply "buy on the rumour, sell on the news". The earnings releases are the news, the rumour being the all the earnings forecasts that are put out by the various market analysts, financial journalists and bloggers.
Posted by: Adrian Trezise | October 09, 2006 at 01:05 PM
Just looking at the chart, is the market in each October UP? Looks that way.
Posted by: Don | October 09, 2006 at 01:07 PM
Tend to agree!
Posted by: tony caldaro | October 09, 2006 at 08:59 PM
In a bull market (even a cyclical one) expectations can get revised upwards during earnigns season (Hey! These guys ARE profitible).
In a bear market, the opposite happens. Do the same study for 1998-2001 (non Nasdaq) or Nazz 2000-02; Or any large cap index from 1966-80
Posted by: Barry Ritholtz | October 10, 2006 at 09:57 AM
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Posted by: Delta Interval | November 02, 2006 at 03:07 PM