"Nvidia's Dominance Mirrors IBM's 1980s S&P 500 Impact"

Nvidia's exceptional performance is significantly boosting the S&P 500, masking the mediocre growth of other stocks. The "Magnificent Seven" tech companies, including Nvidia, have seen substantial gains, while the rest of the index lags. This concentration is causing concern among portfolio managers, as Nvidia alone accounted for one-third of the index's returns on a peak day. The situation is reminiscent of IBM's dominance in the 1980s, and experts warn of potential risks if Nvidia's growth falters.