Bill Ackman: Here's What the Market is MISSING

Key insights

Books referenced

• The Complete Financial History of Berkshire Hathaway - Adam J. Mead - Ackman describes a book (referred to on air only as "The Financial History of Berkshire Hathaway") that goes through every 10-K and deal Buffett made over 60 years - the source of his read on how Buffett built the insurance-float compounding machine he is now replicating at Howard Hughes.

Companies

• Pershing Square - Ackman's fund; discussed as an activist-turned-permanent-capital manager and, via the newly public Pershing Square management company, as its own investable royalty-style stock.
• Howard Hughes Corporation - The real-estate company (owner of Summerlin, NV) Ackman is rebuilding into an insurance-funded 'Berkshire Hathaway 2.0' compounding vehicle.
• Berkshire Hathaway - Explicit model for the Howard Hughes strategy; also cited as the classic example of a durable compounder that traded at its cheapest multiples during the dot-com bubble.
• Wendy's / Tim Hortons - Pershing Square's early activist campaign - buying Wendy's to force a spinoff of the more valuable Tim Hortons, the deal that established the fund's reputation.
• General Growth Properties - Pershing Square's most successful equity trade - bought equity of the bankrupt mall REIT at a huge discount, restructured it, and it was the deal that ultimately produced the Howard Hughes spinoff.
• SpaceX - Cited as the clearest example of underwriting a private mega-cap as a venture bet on people/opportunity/context rather than public-market fundamentals; also cited as having the lowest cost of capital of any equity deal in history if it goes public near $750B-$1T.
• xAI - Ackman personally invested via an SPV, prompted partly by Ron Baron's advice to get into SpaceX-adjacent names.
• OpenAI / Anthropic / Palantir - Discussed as venture-style investments (not seed-stage, but still venture logic) whose capital-spend-versus-revenue gap Ackman says is hard to underwrite from the outside.
• Microsoft, Meta, Amazon - Named as Pershing Square holdings and as examples of durable, AI-exposed 'old-fashioned' businesses Ackman thinks are undervalued relative to newer AI infrastructure plays.
• Tesla - Cited as the strongest example of a founder (Elon Musk) using a large public following to lower a company's cost of capital.
• GameStop - Ryan Cohen's activist stake cited as the real example of social-media-driven 'vibes' valuation changing how markets price stocks, more than Ackman's own Twitter following.
• Salesforce - Named as a SaaS company Ackman worries about given AI's threat to legacy per-seat software pricing.

Techniques and frameworks

• People, opportunity, context, deal - A business-school framework Ackman uses to underwrite pre-IPO/venture-style investments like SpaceX - assessing team, market opportunity, competitive context, and only then deal terms/valuation.
• Valuation as a rubber band - Ackman's model for mean reversion: when valuations get stretched too high or too low relative to fundamentals, the 'rubber band' snaps back, and he goes public with strong opinions at those extremes to help trigger the reset.
• Insurance float compounding (Buffett model) - Invest policyholder float conservatively (short-term treasuries) while investing the insurer's surplus/equity aggressively in common stocks - the mechanism Ackman is replicating at Howard Hughes.

Summary

Bill Ackman joins the All-In hosts for a wide-ranging conversation that opens with how his investing style has changed. Where early Pershing Square was a smaller, more liquid activist that bought and exited positions and had to fight for a CEO's attention (the Wendy's/Tim Hortons spinoff campaign is the origin story), Ackman now runs a fund built around permanent, long-duration holdings and says the single most important lesson of his career has been the weight of durable, "non-disruptable" business quality. Ironically, he says he is as activist as ever, but the activism now happens mostly on Twitter rather than in boardrooms, because Pershing Square's reputation means companies often welcome the fund as a shareholder before being asked.

Much of the conversation turns on how AI reshapes underwriting. Ackman argues that cheap, abundant compute, capital, and talent have raised the odds that any incumbent can be disrupted by a tiny new entrant, making disruption-risk assessment the hardest part of his job. He thinks this dynamic is currently mispricing the market: capital is chasing chips, semiconductors, and energy while durable, AI-exposed platforms like Microsoft, Meta, and Amazon get treated as yesterday's story and left cheap, a pattern he compares to Berkshire Hathaway's rock-bottom multiples during the dot-com bubble. For pre-IPO AI giants like SpaceX, xAI, OpenAI, Anthropic, and Palantir, he says he underwrites them the way he'd underwrite a venture investment - people, opportunity, context, then deal - rather than as public-market value plays, and admits he hasn't finished the math on several of them. He is candid that most large companies, including his own Pershing Square, are still in the earliest and largely unsuccessful phase of getting real ROI from AI.

A recurring thread is why founder-led companies outperform: founders have their entire reputation and often a large ownership stake on the line, versus hired CEOs with ~3-4 year average tenures who are incentivized to avoid visible mistakes rather than make bold bets. Ackman connects this directly to his current flagship project, transforming Howard Hughes Corporation into what he explicitly calls a "Berkshire Hathaway 2.0" - after studying a detailed history of every Buffett deal, Pershing Square is redirecting Howard Hughes's real-estate cash flow (the company owns roughly 26,000 acres including the Summerlin master-planned community) into a new insurance operation, investing policyholder float conservatively while putting the insurer's surplus into equities, with the explicit goal of compounding a roughly $4 billion company toward a trillion dollars over the next 50 years.

The conversation closes on fame and market psychology. Ackman distances his own notoriety from real structural change in markets, pointing instead to Ryan Cohen's GameStop stake as the clearer example of social-media-driven "vibes" investing, and cites Elon Musk as the strongest case of a founder using a large following to lower a company's cost of capital. He frames his own history of viral, high-conviction public calls - most notably his March 2020 COVID-crash CNBC appearance - as an attempt to trigger a "psychological reset" when valuations stretch too far from fundamentals in either direction, describing valuation as a rubber band that eventually snaps back.

Notable Quotes

"Valuation is like a tether on the market, right? When it gets too high, it's like this rubber band that's stretching. And inevitably, it bounces back. But it works the other way as well. When stocks get too cheap, there's this... the rubber band's actually pulling valuations up." - Bill Ackman

"The hardest thing you have to do as an investor is understand... what's the risk of two guys, two women from Stanford in a garage coming up with something. That risk I think has gone up dramatically." - Bill Ackman

"You go work for a hedge fund, you go work for Fidelity, you go work for Wellington, but you don't go work for an insurance company. So the insurance company's ability to recruit investment talent is very limited. Buffett owned half the company, he was really good at investing, which is why it worked." - Bill Ackman

"I don't think markets have changed as a result of anything that's happened with me or follower growth on Twitter. I think the Ryan Cohen guy, you know, the GameStop guy - that is a change in markets." - Bill Ackman