Micron and Nvidia Drive 36% of Third-Quarter S&P 500 Earnings Growth

Two major semiconductor makers, Micron Technology, Inc. (NASDAQ:MU) and NVIDIA Corporation (NASDAQ:NVDA), are projected to generate 36% of all S&P 500 earnings growth in the third quarter. Overall S&P 500 earnings per share are expected to increase by roughly 27% year-over-year entering the Q3 reporting period, even as valuation multiples across many growth stocks have compressed.

Profit expansion remains heavily concentrated in a small group of market leaders. The ten largest corporate contributors represent roughly two-thirds of expected growth, driven primarily by companies in the memory, semiconductor, and energy sectors. Excluding those top ten firms, overall index earnings growth drops to approximately 11%, while the smallest 300 companies in the benchmark are expected to increase earnings by about 5%. Despite this narrow driver, underlying participation remains broad, as nearly 74% of S&P 500 firms are projected to post positive year-over-year earnings growth, beating the post-2021 median of 66%.

While corporate fundamentals remain resilient heading into the fourth quarter, upcoming quarterly results and corporate guidance will serve as a crucial test for equity market stability. Investors will be closely watching whether earnings momentum can broaden beyond key chipmakers and energy providers. In recent trading, Micron shares fell 3.62% to $953.20, while Nvidia rose 0.97% to $228.50.