s and p 500 day of week returns

The S&P 500 (GSPC) has had its highest average return by day of the week since December 30, 1927 on Wednesdays, averaging a 0% return.

ASSETDAY% RETURN
the S&P 500 (GSPC)
Monday
-0.02%
the S&P 500 (GSPC)
Tuesday
0.03%
the S&P 500 (GSPC)
Wednesday
0.04%
the S&P 500 (GSPC)
Thursday
0.01%
the S&P 500 (GSPC)
Friday
0.03%