Investing.com -- A packed week of Big Tech earnings produced significant moves in both directions, with memory stocks experiencing significant volatility. Here are Investing.com's stocks of the week:MicrosoftMicrosoft surged over 15% on Thursday and has added a further 2.5% as of 13:39 ET on Friday after delivering a quarterly beat and issuing stronger-than-expected current-quarter revenue guidance, while keeping its capital expenditure outlook for calendar 2026 unchanged. AppleApple tumbled more than 9% on Friday after issuing September-quarter sales growth guidance of 9% to 11%, falling short of analyst expectations of around 12%. Meta PlatformsMeta has declined 9% in the last week after reporting second-quarter earnings after the close on Wednesday, missing and issuing third-quarter revenue guidance below Wall Street expectations. Total costs and expenses jumped 55% to $42.03 billion, including $2.4 billion in legal charges and $1.18 billion in severance costs tied to May's workforce reduction.