Microsoft

Microsoft's $13B investment in OpenAI transformed it from a legacy enterprise software company into the dominant player in AI infrastructure, with Azure AI services growing 60%+ year-over-year in 2025. The company crossed $3 trillion in market cap in early 2024 — neck-and-neck with Apple — driven by Copilot integration across its 1.4 billion Microsoft 365 users. CEO Satya Nadella's journey is detailed in his bestselling memoir 'Hit Refresh', which chronicles how he rebuilt Microsoft's culture after years of stagnation. Annual revenue surpassed $245B in fiscal 2025.