I think the reasoning for adding SMCI to the S&P 500 was that it's market cap was too large for the S&P 400 Midcap. The amazing thing is that it is still part of the Russel 2000 small cap (IWM) with a market cap of $50+ billion.
Even the SPY is just another momentum fund. Deckers is up like 90% since the end of last October. Whirlpool has been dropping for a while pretty much since the beginning of the pandemic. Zions is caught in the regional bank death spiral of never ending HTM losses.
They need smci in the s&p to jolt the index higher based on ai hype...