Stupid question I’m new to this but are the S&P 500 companies in the US total index?
No, the Standard and Poor 500 is the "chosen" biggest 500 companies for that exchange.
Think of the exchanage as a shopping center.. there's 504 shops ran by 500 companies.. companies can join and leave..
Next is the S&P 250, which is the chosen next biggest (large-mid cap) 250 companies.
then I think it's the S&P 400.. which is the next 400 companies (mid cap)...
you have the Dow, nasdaq and one other... that's slip my mind as it's late now.. EDIT: Russell
think of them like different brands shopping centres, some companies will appear in just one, two or all three of them.
but when most people say the US stock market they are refering to the S&P 500.
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EDIT: trying to clear it up as it's as clear as mud..
S&P 500 - top large 500 US companies
+
S&P 400 - middle - mid cap US companies
+
S&P 600 - small cap US companies
= S&P 1500 comp - all of those companies together.