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A lot of people treat the S&P 500 like it is a passive, mathematical law of nature. It isn't. It is an actively managed, rules-based product run by a committee, and they change the rules whenever the market threatens to break their methodology. Right now in mid-2026, they are quietly rewriting the rulebook to accommodate the incoming wave of massive IPOs like SpaceX and Anthropic. I wanted to break down exactly what is happening now, and rank the most impactful …
— ORIGINAL POST ·
Sp500 - 100 years of changes - how significant is the mega ipo changes?
· r/stocks
· Jun 3, 2026