Tepper slashes Microsoft; Ackman makes a new, large bet as big investors split on MSFT

Large investors are sending conflicting indicates on Microsoft after two prominent managers took opposite actions in the first quarter of 2026, according to a market report published Tuesday.

David Tepper’s Appaloosa Management reportedly reduced its Microsoft position by about 82% during the quarter, trimming what had been a sizable holding. The move suggests Tepper, known for making concentrated bets and then adjusting when his assumptions change, was less willing to keep Microsoft at its prior weight in the portfolio.

At the same time, Bill Ackman’s Pershing Square reportedly went in the opposite direction, initiating a brand-new Microsoft position of roughly 5.65%. The report says the purchase amounted to about $2 billion, a scale that indicates Ackman’s team viewed Microsoft as one of the more compelling opportunities for fresh capital rather than a crowded “hold” position.

Neither manager’s full rationale was provided in the report, and the post did not include details on valuation, time horizon, or specific business drivers behind the trades. That gap matters because Microsoft’s business has multiple levers that can justify both caution and conviction, including demand for cloud services, the economics of data-center spending, and monetization pathways for artificial intelligence.

To put the trades in context, Microsoft has spent years building a diversified technology stack that spans Azure cloud, productivity software, enterprise security, and a growing set of AI offerings delivered through its platforms. In practice, investors often treat Microsoft as a combination of a cash-generating software company and a long-duration infrastructure play through Azure. A manager who believes Azure growth and AI workloads will expand returns may add aggressively, while another who worries about margin pressure, competitive dynamics, or capex intensity may cut exposure even if the long-term story remains intact.

Still, without additional disclosure from either fund, it is not possible to say whether Appaloosa’s reduction reflected concerns about near-term earnings, a broader risk-management decision, or a rotation into other holdings. Likewise, Pershing Square’s rationale is not established by the report alone, and the reported stake size does not reveal whether it was built via one or multiple transactions over the quarter, nor how the position fits with other holdings and hedges inside Pershing Square’s broader strategy.

What to watch next is whether these moves show up in later filings and commentary that spell out the thesis. For market participants, the key follow-up is not just the size of the positions, but how each manager frames Microsoft’s AI and cloud economics as investors approach the next cycle of earnings, product updates, and cloud capacity investment decisions.