In the three trading days from the close on July 29 to the close on August 3, the market capitalization of these four cloud computing giants rebounded significantly. Previously, investors were concerned about profit pressure and declining free cash flow due to Alphabet's increased capital expenditure guidance. However, subsequent earnings reports from Amazon and Microsoft alleviated market concerns. Amazon reported the fastest growth for its AWS business in 18 quarters, while Microsoft achieved an 18% overall revenue growth and 27% cloud business revenue growth, and provided optimistic guidance for fiscal year 2027, expecting double-digit growth in revenue and operating profit.