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Microsoft logs $3.2B from Anthropic investment, but OpenAI was a mixed bag
During its fiscal 2026 fourth quarter, Microsoft reported exceptional overall earnings whilst revealing divergent performance from its two major AI investments. The technology giant recognised a $3.2 billion gain on its Anthropic stake, which it acquired for $5 billion in November 2025 under an arrangement where Anthropic committed to purchasing $30 billion in Azure services. This single quarter's appreciation added meaningfully to results, boosting diluted earnings per share by 33 cents and representing substantial value growth in the younger AI lab.
Microsoft's established OpenAI investment, which the company revalues quarterly, moved in the opposite direction during the period, declining roughly $600 million and reducing earnings by 7 cents per share. Viewed annually, the OpenAI stake recovered to generate a $5 billion gain for the full year. However, the emergence of nearly equivalent single-quarter Anthropic gains relative to full-year OpenAI performance struck Microsoft as significant enough to explicitly highlight, suggesting a notable recalibration in how the company's AI portfolio valuations are evolving.
In short
- Microsoft realised a $3.2 billion gain on its Anthropic investment in Q4 2026, adding 33 cents to diluted earnings per share
- OpenAI investment declined approximately $600 million in the same quarter, reducing EPS by 7 cents
- Single-quarter Anthropic appreciation nearly matched Microsoft's full-year OpenAI gain ($5 billion), prompting Microsoft to explicitly disclose the divergence
Steelman: both sides, in good faith
The strongest fair case each way — we don't pick a winner.
The case for
The Anthropic gain may signal that Microsoft’s AI portfolio is becoming more valuable and less dependent on OpenAI, while the Azure purchase commitment could also support future cloud demand. Highlighting the contrast gives investors useful information about how each investment is performing and about the potential returns from backing multiple AI developers.
The case against
A single quarter’s accounting gain is not the same as realised cash or proof of lasting commercial success, and quarterly valuations can move in either direction. Comparing Anthropic’s one-quarter rise with OpenAI’s full-year gain may overstate a shift in the portfolio, especially when both stakes’ reported values depend on changing estimates and commercial arrangements.
Explained simply
Microsoft is a major technology company that has invested heavily in two artificial intelligence firms: Anthropic and OpenAI. These companies have developed AI systems that can perform complex tasks like writing and reasoning, technologies that are reshaping how businesses operate. Microsoft invested in both because AI capability is seen as crucial to future competitiveness in the technology industry.
When a company invests in another firm, it reports how much that investment is worth each quarter, and these valuations can fluctuate significantly depending on market views about the invested company's prospects. Microsoft acquired its stake in OpenAI several years ago, whilst it invested $5 billion in Anthropic in late 2025 as part of a strategic partnership. The different performance of these two investments reflects broader market uncertainty about the future competitive position of different AI companies.
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