The "AI Big 10," comprised of the "Big Seven" tech giants plus Broadcom, AMD, and Micron, now accounts for approximately 42% of the US stock market capitalization, more than double its low point in the 2022 bear market. The combined market capitalization of just the Big Seven alone is approaching $25 trillion, indicating that the US stock market index is increasingly reliant on a few AI leaders. This proportion superficially surpasses the peaks of approximately 41% during the 2000 TMT bubble and approximately 40% during the "Nifty Fifty" of the 1970s.
