Microsoft's Anthropic Stake Gains $3.2B, OpenAI Position Cut $600M in Q4 FY2026

Microsoft's Q4 FY2026 results showed a $3.2 billion mark-to-market gain on its Anthropic stake — a $5 billion investment from November 2025 — alongside a roughly $600 million markdown on its OpenAI position. The Anthropic gain added $0.33 to diluted EPS; the OpenAI writedown subtracted $0.07. Q4 diluted EPS was $4.81 on $90 billion in revenue.