Funding & Deals

Microsoft logs $3.2B from Anthropic investment, but OpenAI was a mixed bag

When Microsoft reported killer fourth-quarter earnings for its fiscal 2026 year (which ended June 30), it tucked in an interesting little tidbit about how its investments in the two biggest, and competing, AI labs are doing.

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Microsoft recorded a $3.2 billion gain on its Anthropic investment in the fourth quarter of fiscal 2026, which it obtained after investing $5 billion in November 2025. The company's investment in OpenAI, by contrast, was marked down by about $600 million in the same quarter, though it generated a $5 billion gain for the full year. Microsoft owns about 27 percent of OpenAI and accounts for the value of its investment quarterly, while it does not routinely update its Anthropic valuation each quarter. The notable difference between the two investments is significant enough that Microsoft disclosed it despite the $600 million OpenAI decline being relatively minor in the context of the company's overall highly profitable quarter.

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