Many of you may know, but others like myself did not know,

S&P 500 index includes (approx) 70 Nasdaq stocks and a few AMEX stocks, a few foreign corporations stocks, the rest from the NYSE.

The NYSE stocks are (approx) 82% of the S&P500.

This is based on index lists of Feb 4, 2010. The lists do change with time.

So when we chart the NYSE charts (like the NYSI Summation Index) with comparisons to the SPX, just remember the SPX is only (approx) 82% of NYSE

The Nasdaq stocks included in the S&P500 index are: