Christopher Hohn's TCI Fund Management has nearly liquidated a roughly $8 billion stake in Microsoft and rotated the proceeds into Alphabet, citing fears that generative AI could erode the moat around Office and pressure the Azure cloud business. The disclosure, contained in TCI's latest investor letter and reported across financial press on Friday, sent Microsoft shares down about 1% in the session — a small move on the tape, but a striking statement of conviction from one of the most profitable hedge funds of 2025.
From a top holding to a rounding error
TCI cut its Microsoft position from approximately 10% of the portfolio at the end of 2025 to roughly 1% by March 2026, ending a holding period that stretched back nearly a decade. The fund has simultaneously lifted Alphabet to about 5% of the book from 3%, making Google's parent its largest technology bet, while continuing to hold Nvidia.
"We reduced our investment in Microsoft because the rapid progress in AI introduces uncertainty over Microsoft's competitive position in the future," Hohn wrote, according to letter excerpts circulated to investors. "We are primarily concerned about Microsoft's Office productivity software franchise, where AI could change established workflows and lead to the emergence of new productivity platforms, but we also see some risks in Azure."
Why Office and Azure are in the crosshairs
Hohn's thesis lands at an awkward moment for Redmond. Anthropic's Claude add-ins for Word, Excel and PowerPoint went generally available this month through the Microsoft Marketplace, with cross-app context continuity that Copilot does not yet offer in the same form. ChatGPT-native experiences are appearing in third-party apps and browsers, and OpenAI is openly courting enterprises with autonomous workflow agents. Each of those wedges chips at the assumption that productivity software belongs by default to whoever owns the document format.
Azure remains a growth engine — Microsoft reported the cloud unit growing roughly 40% in its most recent quarter — but Google Cloud grew about 63% over a comparable period, and Anthropic has just locked in a $200 billion compute commitment with Google. That comparison is increasingly the bull case for Alphabet inside hedge-fund books that previously treated Microsoft as the default AI-cycle proxy.
A signal others are following
TCI is not alone. Reports indicate Duquesne Family Office and Tiger Global have made directionally similar trims in recent quarters, even as broader tech indices remain near record highs. The pattern points to a more selective phase of the AI trade: capital is still flowing toward the cycle, but managers are willing to underwrite specific platform winners rather than buy the megacap basket wholesale.
The implication
For Microsoft, the practical impact of one fund's exit is limited — its market capitalization absorbs an $8 billion sale without flinching. The reputational impact is harder to dismiss. When the most-watched activist of the past cycle declares that AI is a competitive risk to Office, every CIO benchmarking Copilot against Claude or ChatGPT now has air cover to ask the same question.
