According to @charliebilello, the top 10 holdings in the S&P 500 now comprise nearly 39% of the index, the highest concentration on record. Source: twitter.com/charliebilello/status/1972738353817956488 and bilello.blog/newsletter In a float-adjusted, market-cap weighted index such as the S&P 500, larger constituents drive a disproportionate share of returns, meaning higher concentration increases the index’s sensitivity to moves in a few mega-cap names for SPX and ES traders. Source: spglobal.com/spdji/en/documents/methodologies/methodology-sp-us-indices.pdf For crypto markets, equity shocks can spill over because Bitcoin’s correlation with US stocks rose markedly during prior stress episodes, signaling shared risk sentiment that traders in BTC and ETH should monitor alongside mega-cap earnings and guidance. Source: imf.org/en/Blogs/Articles/2022/01/11/crypto-prices-move-more-in-sync-with-stocks