The Market Context

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May 4, 2026

Bill Ackman’s $15.5B Pershing Square Adds Meta and Doubles Amazon in AI Pivot

5 min read · May 4, 2026

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The Market Context in 60 Seconds

01 Pershing Square Capital Management, the concentrated activist fund run by Bill Ackman, disclosed a $15.5 billion equity portfolio in its February 13F filing, built around one rotation: a new $1.8 billion Meta stake and a doubled Amazon position, paid for with a full Chipotle exit.
02 The disclosed equity book grew from about $14.6 billion at end-September to $15.5 billion at end-December across 10 issuers, putting Pershing Square in the same AUM band as Brad Gerstner's Altimeter Capital and Stanley Druckenmiller's Duquesne Family Office.
03 Five names make up about 73 percent of the portfolio: Brookfield at $2.82 billion, Uber at $2.47 billion, Amazon at $2.22 billion, Alphabet at $2.15 billion, and Meta at $1.76 billion.
04 Three of the top five are now AI mega-cap technology platforms whose advertising and cloud-computing engines benefit directly from each new wave of AI model spending.
05 Attention returned to the holdings this week as Ackman's new closed-end Pershing Square USA fund, a publicly traded vehicle holding the same 13F positions, priced its IPO and traded below its issue price for two straight days.

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