Bill Ackman’s Pershing Square filed a 13-F showing eleven U.S. equity positions worth $13.7 billion at the end of March, with the top five swallowing 78 percent of the portfolio. That concentration is the story: a fund this large, run this tightly, turns every holding into a high-conviction statement rather than a diversified bet. The three largest, Brookfield, Amazon, and Uber, together command just over half the book and reveal a manager positioning for compounding cash flows more than for the next quarter’s momentum trade.
Brookfield sits at the top with 59.7 million shares valued around $2.4 billion, a 17.6 percent weight. The Canadian conglomerate’s distributable earnings before realizations grew 7 percent per share year over year in the first quarter and ran at a $5.5 billion annualized pace, while the company bought back $470 million of its own stock in the first months of the year. Ackman is effectively buying a perpetual capital-recycling machine at a discount to the sum of its listed parts, and the buyback signals management agrees.
Amazon carries an almost identical weight at 17.4 percent, or 11.5 million shares worth roughly $2.4 billion. First-quarter net sales climbed 17 percent to $181.5 billion and operating income jumped 30 percent to $23.9 billion, but the figure that matters is AWS: revenue accelerated 28 percent year over year, the fastest pace in fifteen quarters, as AI workloads keep piling onto the cloud. The thesis is straightforward, the highest-margin engine of the world’s largest retailer is re-accelerating, and the market has not fully priced the duration of that cycle.
Uber rounds out the trio at 15.7 percent, a 30 million-share stake valued near $2.2 billion. Gross bookings rose 25 percent to $53.7 billion, revenue 14 percent to $13.2 billion, and free cash flow hit $2.3 billion in the quarter. The stock has ignored the fundamentals, down 11 percent year to date and trading at roughly eighteen times earnings. Ackman is betting that the autonomous-vehicle partnerships, starting with a luxury robotaxi fleet of at least 35,000 Lucid vehicles running Nuro software, will turn the network into a platform that captures the economics of driverless rides rather than being disrupted by them.
The counter-argument writes itself: five names representing 78 percent of a $14 billion fund means a single thesis breakdown inflicts portfolio-level damage. Ackman has the track record, the research infrastructure, and the temperament to absorb drawdowns that would force liquidation at most shops. For anyone else, copying the names without the risk budget is not investing, it is cosplay. The watch item now is whether the AI-driven AWS acceleration and Uber’s robotaxi rollout convert narrative into sustained free-cash-flow inflection, or whether the concentration simply amplifies the next inevitable surprise.