Tech companies to retake market reins as Wall Street rally faces new test

A third of the S&P 500 is set to report quarterly results this week. Picture: AP Photo/Richard Drew

The rally on Wall Street faces a fresh test this week with a flood of earnings reports from major U.S. companies, including the tech and internet behemoths that have recently retaken leadership of the market.

More than one-third of the S&P 500 is set to report quarterly results this week, headlined by Apple, Microsoft, Amazon and Google-parent Alphabet, the four largest US companies by market value.