S&P500 is not a total market index. It tracks a specific kind of large firm, with certain filters.

Fast tracking means that the market likely wont have enough time to find the settled price (especially with the knowledge that passive funds are about to buy), and including a mispriced thing does not necessarily make the benchmark more accurate.

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tristanj 2 hours ago | parent [-]

Those filters for S&P 500 inclusion criteria have changed many times. They are not sacred nor set in stone. The question is, do those filters, which were designed for GAAP profitable traditional companies & discriminate against fast growing cash-flow-reinvesting startups that prioritize growth over profit, unnecessarily exclude major players in the U.S. stock market? The S&P inclusion criteria reward companies that prioritize profit over growth.

SpaceX, Anthropic, and OpenAI are all giga-caps preparing to IPO, and none of them will be eligible for S&P inclusion because of the 12-month profitability requirement. At current valuations, all are part of the top 20 largest companies in the US. These companies may be excluded from the S&P500 for potentially years, until they reach 12 months of profitability.

And you are vastly overstating the effect of S&P500 fast track inclusion, the plan was to reduce it from 12 months to 6 months; which is more than enough time for the market to find a price.

	▲	ywvcbk an hour ago \| parent \| next [-]
		> which is more than enough time for the market to find a price The price markets find would still inevitably be influence by the knowledge that the demand would increase massively in a few months. > inclusion criteria reward companies that prioritize profit over growth Or stable and sustainable growth. Whatever else SpaceX, OpenAI, Anthropic valuations are price in extremely optimistic growth. But yeah, I do see a point that including adequately priced growth stocks could be a net benefit but of course accouting for the actual valuation would turn index funds into managed ones. Thankfully its not an issue at all since there is Nasdaq 100.
	▲	jurgenburgen an hour ago \| parent \| prev [-]
		> Under current rules, these fast-growing companies would be excluded from the S&P500 for potentially years, until they reach 12 months of profitability. > And you are vastly overstating the effect of S&P500 fast tracking, the plan was to reduce it from 12 months to 6 months; which is more than enough time for the market to find a price. They might never reach 6 months of profitability, let alone 12 months.