Quote from Pa(b)st Prime:
Hey Boss! How so?
Quote from michaelscott:
http://www.indexarb.com/indexComponentWtsSP500.html
The top 10 components of the SPX make up 20% of the entire index. The top 25 components of the SPX make up an even greater percentage of course.
Now if one of the top 25 components warns or has a bad earnings call then it may bring down any other components of the SPX that are related. On the flipside, if they have a good earnings call then it will bring up the other components.
For example, if Exxon comes out with a bad earnings call then it will most likely effect other players like ConocoPhilips. Exxon makes up 3.76%, Conoco makes up 1.03%, Chevron makes up 1.45%, etc. Energy makes up 10.8% of the index. Therefore, when Exxon reports 10.8% of the index is on the line.
In the end, the fate of the market depends upon less then 25 stocks...