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REDDIT

Is S&P 500 the tail or the dog?

M
Oct 4, 2026 · 21:08

What is the volume of daily trades of the various S&P 500 ETFs, versus the daily trade volume of the constituent stocks?

I’m trying to understand whether a typical day is more about all the individual stocks driving the S&P 500 number, or vice versa?

I think this is a different question than what share of funds are active vs passive, I’m looking for data on volume of trades