Pershing Square Capital disclosed a $15.53 trillion portfolio in its Q4 2025 13F filing, featuring substantial churn. Management initiated one new stock and exited five former positions, demonstrating a focused re-evaluation of its holdings. Brookfield Corporation (BN) anchored the portfolio at 18.1%, with Uber Technologies (UBER) (15.9%), Amazon.com (AMZN) (14.3%), Alphabet (GOOG) (12.5%), and Meta Platforms (META) (11.4%) comprising the remaining top five stakes.

Pershing Square initiated a substantial new position in META Platforms during the fourth quarter of 2025. The move adds a company valued at $1.76 trillion to the concentrated portfolio, signaling Ackman’s conviction in the social media giant’s core advertising strength. He likely identified the existing Facebook, Instagram, and WhatsApp platforms as a predictable revenue engine, discounted by market concerns over its costly metaverse investments. An activist stake suggests Pershing Square sees scope to influence capital allocation, potentially pushing for reduced speculative spending or increased shareholder returns from the highly profitable ad operations. Ackman buys simple, predictable businesses, and META’s established user base provides just that, even amid broader tech sector volatility.

Common threads connect Ackman’s META purchase with his established investment philosophy. He targets businesses capable of generating significant free cash flow, where operational or strategic adjustments can unlock hidden value. META’s dominant position in digital advertising offers precisely that potential, with an underlying business model that demands relatively low capital to grow its primary revenue stream. This investment aligns with Pershing Square’s approach: identifying large, well-known enterprises with clear competitive advantages, then engaging to drive value through focused governance or financial re-engineering. The firm frequently seeks discounts on businesses where temporary market sentiment obscures fundamental long-term earning power.

Bill Ackman intensified his commitment to core holdings in 2025’s fourth quarter, allocating significant capital to two established positions. Pershing Square Capital Management expanded its Brookfield Asset Management stake by 50%, driving the total position value to $2.82 trillion. Amazon also received a substantial capital injection; Ackman boosted his position there by 65%, reaching a $2.22 trillion valuation.

Such aggressive increases within a portfolio typically limited to 8-12 positions broadcast powerful conviction. Ackman’s willingness to add such substantial amounts — particularly Amazon’s 65% expansion — confirms deeply rooted belief in their long-term prospects. He buys simple, predictable businesses, then works for operational or strategic change. Expanding these positions means Pershing Square sees more value to unlock, expecting greater returns from its established plays. Ackman places bigger bets where he expects bigger outcomes.

Pershing Square Capital Management slashed its Alphabet Class A (GOOGL) position by a stark 86% during Q4 2025. Such a near-complete exit signals a significant reassessment for Bill Ackman, who typically maintains a concentrated portfolio of 8-12 high-conviction plays. Ackman builds positions for the long term, seeking operational or strategic value unlocks. A reduction of this magnitude suggests the thesis for Alphabet Class A no longer aligns with those strict criteria, or alternative opportunities offer superior risk-adjusted returns.

A more modest 3% cut in Alphabet Class C (GOOG) mirrors the sentiment, albeit with less urgency. Ackman’s investment philosophy demands a clear path to value creation from simple, predictable businesses. The absence of reductions in UBER, Restaurant Brands International (QSR), and Hilton Worldwide Holdings (HLT) reveals continued conviction in those names. Divesting nearly all of one Alphabet share class, while trimming another, indicates Pershing Square’s capital found better use elsewhere, or macro factors altered the original investment calculus for the tech giant.