The September 13 gain of .84% follows Wednesdays just plus .0045% and the substantial 1.36% increase of Tuesday. This is the 12th +3 (successive positive closes) day this year.
Since 1950, the S&P500 scored only 1114 three in a row up days, with 118 of these since 2000.
The average +3 gain since 2000 is .62%; while 27 of these increases were greater than todays + .86%, the other 91 closes were smaller.