Wolframius
Registered User
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No, the S&P500 is always hovering around 500 companies, based on market cap and other criteria. If a company rise up in value and was not in the index, they will be considered for inclusion at the expense of another company that is not doing so well.So, the S&P for example must remain at a particular size. If one company's shares increase in value, another company must leave the index to maintain the size of the S&P.