According to CoinMeta, as reported by Benzinga, Nvidia ($NVDA) has a market value of nearly $6 trillion, and major indices have reached new highs. However, Rosenberg Research founder David Rosenberg stated that the strong performance of a few AI stocks has overshadowed the overall weakness in the market. He pointed out that the average stock in the S&P 500 index is 20% below its 52-week high this week, and the median stock has fallen by about 17%. Rosenberg believes that the weakness in market breadth could be a warning sign, as a healthy bull market usually involves gains in more stocks. Recent performance has been concentrated in ultra-large companies and semiconductor firms related to AI; Nvidia accounts for more than the combined weight of the 256 smallest companies in the S&P 500, indicating a reliance on a few large stocks. He warned that the risk of trading AI lies in investors possibly questioning whether future revenue growth can justify such substantial infrastructure investments, and weak guidance could change market sentiment. The probability of a significant decline in the AI sector before the end of the year is still assigned a low probability by forecasts.