Ackman and Berkshire boost Microsoft, Alphabet bets; Buffett exits Amazon entirely

Two major institutional voices have sent a clear portfolio signal: Microsoft and Alphabet are preferred over Amazon as the AI infrastructure capex cycle matures. Bill Ackman's Pershing Square added 5.65 million shares of Microsoft in Q1 2026 at valuations around 21x forward earnings, exactly in line with the broad market and notably cheap relative to MSFT's own 5-year historical average. This move comes after Ackman's earlier public criticism of mega-cap concentration risk, suggesting he sees MSFT as the most defensible name in mega-cap tech given its Azure cloud platform and enterprise software moatA sustainable competitive advantage that protects long-term returns on capital..

Berkshire Hathaway, under new CEO Greg Abel's first quarter, similarly boosted its Alphabet position while entirely exiting its Amazon holding. The exit of AMZN is particularly notable; Buffett had held the position for years, and the decision to liquidate entirely signals skepticism about Amazon's retail growth prospects relative to its cloud and ad tech arms. The Alphabet boost, conversely, reflects confidence in Google's search dominance and the company's ability to monetize AI through its core advertising business and cloud infrastructure.

Microsoft's durability story centers on enterprise stickiness. The company's dominant position in corporate software (Office 365, Teams, Dynamics) and its partnership with OpenAI for ChatGPT integration gives it multiple revenue levers that are less dependent on hardware capex cycles. Ackman's entry at 21x valuations, just as sentiment has turned risk-off and bond yields have spiked, looks tactically well-timed if the equity market stabilizes. The move also signals that institutional money is rotating away from pure AI hardware plays (Nvidia, chip names) toward software infrastructure and cloud platforms.

The downside risk is if the AI capex cycle continues to accelerate and hardware (Nvidia, AMD) becomes the gating factor for cloud profitability. Additionally, Microsoft and Alphabet valuations are not cheap in absolute terms; if the Fed holds rates higher for longer due to inflationThe rate at which prices rise across an economy., multiple compression could offset the relative outperformance story. Amazon's exit also suggests concern about e-commerce margin pressure and competition from other retailers, a headwind that could extend to Alibaba and other platforms.