Microsoft, Alphabet, and Amazon Make Up About 15% of the S&P 500. All 3 Report Earnings Within 2 Days.

Microsoft, Alphabet, and Amazon, which collectively represent 15% of the S&P 500, are scheduled to report earnings within two days (Oct. 28-29, 2026). Despite the index rising 12% year-to-date, these three tech giants have underperformed, gaining only 2-8% each. Their earnings reports could move an S&P 500 fund by approximately 1%, though the index's gains have been driven primarily by Apple and Nvidia this year.