Big week for earnings at Apple and other big tech as scrutiny increases        

Apple, Google, Amazon, and Facebook together accounting for about a fifth of the S&P 500's total value, report their quarterly results on Thursday, with their shares trading near record highs, even as they face increasing antitrust scrutiny.

Amazon and Apple have surged 74% and 57%, respectively, this year, far outperforming the S&P 500’s 5% gain as the coronavirus pandemic accelerates trends toward online shopping, video streaming, and other technologies helping Wall Street’s largest companies take market share from smaller rivals.