There's very little money "flowing into" the companies on the S&P500 by virtue of their inclusion. Buying a share of Coca Cola doesn't give money to Coca Cola,

There's very little money "flowing into" the companies on the S&P500 by virtue of their inclusion. Buying a share of Coca Cola doesn't give money to Coca Cola, it gives it to the previous 3rd party owner of that share. With the exception of new share issuances like IPOs, the share price of a company is mostly irrelevant to the cash position of that company.