AI Capex Overbuild

Hyperscaler AI capex stands at $720bn-plus for 2026, with Amazon alone projected at $200bn. The overbuild thesis has moved from macro narrative into earnings-level reality: AMD and Alphabet beat consensus in late July yet their shares fell, signalling that the market is repricing the return timeline on committed spend, not just the headline figures. Moody's has formally questioned AI capex return assumptions, providing the mechanism by which a capex snapback becomes a spread-widening event. The bifurcation continues: the chip index remains in a bear market while Apple sits near all-time highs, and the ORCL-MSFT divergence confirms the market is sorting capex-intensive balance sheets from software cash flow names. Morgan Stanley's $500bn-plus AI debt issuance projection keeps credit cascade risk live, with investment-grade spreads the key signal to watch. The macro environment remains elevated: Brent reached $100.38 before retreating to $92.11 as Iran's Hormuz re-closure stayed contested and a China-brokered diplomatic track provided a partial ceiling; the Houthi naval blockade on Saudi Arabia persisted without resolution. NthEffect tracks the rotation inside the AI complex as the overbuild thesis moves from credit-market concern to earnings-cycle execution, with spread markets, earnings guidance revisions, and energy pricing the three underappreciated second-order risks.