Microsoft tops $4 trillion in market cap after hours, joining Nvidia in exclusive club

Group 1 - Microsoft shares surged 8% following a better-than-expected earnings report, raising its market cap to approximately $4.1 trillion, making it the second member of the $4 trillion club alongside Nvidia [2][5] - The company reported an 18% revenue growth, the fastest in over three years, primarily driven by its Azure cloud computing business, with Azure and other cloud services exceeding $75 billion in fiscal 2025, marking a 34% increase from the previous year [3][4] - As of the close on Wednesday, Microsoft shares were up 22% for the year, outperforming the S&P 500's 8% gain, with a record close of $513.71 on July 25 and trading above $553 in extended hours [4] Group 2 - Nvidia and Microsoft have surpassed Apple in market capitalization, with Apple currently at about $3.2 trillion, facing a 17% decline this year amid concerns over its position in the AI sector [5] - Among major tech companies, Nvidia has been the top performer in 2025, with a 33% increase, as its GPUs are essential for large language models developed by Microsoft, OpenAI, and others [6]