Nvidia now accounts for 8% of the S&P 500 by weight, the highest single-stock concentration in the benchmark index since at least the 1970s.

Nvidia's 8% S&P 500 weighting means its 2.50% gain on September 2 drove broad index advances, raising concentration risk questions for passive

Nvidia now accounts for 8% of the S&P 500 by weight, the highest single-stock concentration in the benchmark index since at least the 1970s.