alt Hacker NewsS&P 500 is already heavily skewed towards tech companies (Apple, Google, Meta, Amazon, Microsoft etc.). I think it's something like 40% of S&P500 is tech. If SpaceX/OpenAI/Anthropic are added, tech risks would be even more concentrated, which is bad for diversification.
Putting aside the diversification argument, the three combined would be about ~5-6%. Definitely noteworthy but not really earth shattering