They will only be added to those indexes if they are actually trading at a value that places them in the top 100 or 500 companies in the US. If they fall below that price then they will be kicked out of the index just like any other company.
What exactly is the risk to normal investors if that’s the case? If it’s all a big scam then they will trade lower and they’ll naturally be kicked out of the index.
This is a rule that will apply to all new companies. When Anthropic and OpenAI go public they will also benefit from the rule. Do you think the media/public will be just as outraged when they do it?
The goal of the S&P 500 is to keep the index representative of the US market. They have in fact changed rules in the past when market conditions have changed. These mega IPOs are an entirely new market condition, as private companies have never been this big before listing in history. So large that they immediately fall into the top 100 or 500 largest companies in the country.
There’s also the fact that Nasdaq is a private company and it now has competition from the new Texas exchange. SpaceX is actually dual-listing on TXSE and Nasdaq. Nasdaq needs to keep these giant IPO companies happy because if they don’t they will list on the competitor exchange which would be disastrous for Nasdaq (supercharging their competitor).
These things affect each other as well. Nasdaq wants to make sure they get the IPO on their exchange, so they include them in the Nasdaq 100. S&P 500 doesn’t want to be outdated by missing a trillion dollar company from their index, while other exchanges like the Nasdaq 100 include them.
There’s a real case to be made that this is just self interest on the part of the exchange and the other index providers.