The 10-year Treasury yield reached 5.23% Monday, its highest since 2007, while the 30-year touched 5.56%. By the 6:08 a.m. BST update, the 10-year had traded above 5.27%, its highest in 19 years, and Brent was near $106.60. The S&P 500 fell 0.77%, the Nasdaq 0.92% and the Dow 0.67% on Monday; the dollar index stood at 101.2, up roughly 1.8% in September, and sterling was $1.3248. The mechanism is now unpleasantly direct: oil is lifting near-term inflation risk, strong data is keeping further Fed tightening live, and the resulting term-rate shock is raising the discount rate just as AI-heavy companies contemplate another capital-spending cycle. Nvidia's $150 billion additional buyback supported its own shares, but did not rescue the index. Reuters overnight markets, September 29 · Reuters market close · Reuters currencies, September 29
The important cross-asset distinction is between companies that merely own an AI narrative and those whose cash generation can absorb a 5%-plus risk-free hurdle. A buyback of Nvidia's size is evidence of financial capacity; it is not evidence that every borrower financing an AI build-out has the same luxury.