Since 1950, the S&P 500 is down on the combined days of Monday, Tuesday and Thursday. All of the indexes gains have come on Wednesday and Friday (dividends not included).

Here are the combined gains:

Monday -86.43%
Tuesday 125.23%
Thursday 184.30%
Friday 656.15%
Wednesday 1,201.75%

Since May 16, 1998 the breakdown is as follows:

Friday -13.25%
Tuesday -11.51%
Monday 11.13%
Thursday 13.41%
Wednesday 32.87%

This means that all of the net capital gains for the past 10 years have come on Wednesdays which is just 20% of the time (that's 32.87% for Wednesday, -3.24% for the other four days combined).

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Eddy Elfenbein

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