The letter offers a high-profile counterweight to the capex anxiety that has compressed hyperscaler valuations this year, though readers should note Pershing holds Microsoft, Meta and Amazon. Its two-way framing is the tradeable part: either revenue beats consensus, or spending gets cut, and both outcomes imply higher free cash flow than analysts currently model. That makes the case broadly supportive for the hyperscalers. For chip and hardware suppliers, which have far outperformed their customers this year, the capex-cut contingency is the risk to watch. The sharp distinction drawn between cash-rich hyperscalers and debt-reliant neoclouds also reinforces pressure on neocloud equity and credit.-Earlier:WSJ: Anthropic IPO investors push for lower $1.5 trillion valuation after tech selloff-Bill Ackman’s Pershing Square argues the market has the AI capex story backwards, treating growth investment as a permanent cost when it should pay off in faster revenue or, failing that, leaner spending.Summary:Pershing Square says hyperscaler capital spending is an offensive growth investment, not a defensive cost of protecting existing businessesCapex at Microsoft, Meta, Amazon and Google has risen nearly five-fold, from about $140 billion in 2023 to around $740 billion in 2026; consensus sees a 35% rise to over $1 trillion next yearThe firm expects hyperscaler revenue to beat consensus over the next several years; if it doesn’t, it expects capex to be cut, with free cash flow higher than forecast in either caseIt estimates a gigawatt of AI capacity costs $40 billion to $50 billion to build and can earn a 15% to 25% pre-tax return on capitalIt argues the hyperscalers can largely self-fund the buildout, unlike neoclouds, which face wider credit spreads and falling share pricesPershing Square’s own Q3 fee-related earnings rose 13% to about $64 million, while distributable earnings fell 12% as corporate taxes kicked inBill Ackman’s Pershing Square has argued that Big Tech’s surge in capital spending is an offensive bet on growth rather than a defensive cost, and that investors are underestimating the revenue it will generate.In its third-quarter shareholder letter, signed by Ackman and Chief Investment Officer Ryan Israel, the firm said capex at the four hyperscalers, Microsoft, Meta, Amazon and Google, has risen nearly five-fold. It went from around $140 billion in 2023 to roughly $740 billion in 2026, based on company guidance, and consensus forecasts a further 35% increase to more than $1 trillion next year. Capital intensity across the group has climbed from about 12% of revenue to an estimated 38% over the same period.That spending has weighed on the hyperscalers’ valuations. Their shares are up about 8% on average this year despite 27% earnings growth, while the S&P 500 semiconductor and technology hardware indexes, which Pershing treats as proxies for the companies supplying the buildout, have gained 44% and 36%.Pershing argued that consensus estimates assume today’s heavy spending will persist for years while building in little revenue acceleration. It said it is highly probable hyperscaler revenue growth will beat analyst forecasts. If it does not, the firm expects the companies to cut capex from current levels, leaving free cash flow meaningfully higher than consensus implies in either scenario.The firm estimates that one gigawatt of AI data center capacity costs roughly $40 billion to $50 billion to build and could generate $15 billion to $20 billion in annual revenue. That implies a pre-tax return on invested capital of about 15% to 25%. On that basis, it sees potential for revenues to run 15% to 35% above consensus within three years.Pershing also rejected concerns that the buildout will strain the hyperscalers’ finances, distinguishing them from neoclouds, Oracle and SpaceX. It noted the four have virtually no net debt and can fund most of their spending from operating cash flow.The firm holds Microsoft, Meta and Amazon in its portfolio. Separately, Pershing Square Inc. reported third-quarter fee-related earnings of about $64 million, up 13%. Distributable earnings fell 12% to about $49 million as corporate income taxes took effect for the first time. Ackman and Israel host a conference call at 9:30 a.m. ET (1430 GMT) on Tuesday, followed by a public Q&A at 10:30 a.m. ET (1530 GMT). This article was written by Eamonn Sheridan at investinglive.com.