The S&P 500’s New Capex Super‑Cycle: How AI Is Rewriting the Playbook

[image of S&P 500 capex and S&P 500 capex yoy% growth]

For years, investors obsessed over buybacks and dividends. Now a different line on the cash‑flow statement is stealing the spotlight: capital expenditure. AI is turning S&P 500 capex into a full‑blown super‑cycle.

Big Tech is leading the charge. Estimates suggest that the largest AI and data‑center players – think hyperscalers and chip makers – plan to spend well over 300 billion dollars on capex in 2025 alone, with some forecasts putting AI‑related investment closer to 400 billion. For a handful of mega‑caps, capex is approaching levels last seen in the late‑1990s tech boom as a share of cash flow.

What are they buying? Primarily three buckets: advanced chips and servers, massive data‑center build‑outs, and the power infrastructure to keep those racks running. This spending arms race is intensely competitive. Each firm wants to offer the fastest, most capable AI models and platforms, and that requires heavy upfront investment.

For equity investors, this capex surge cuts both ways. On the positive side, it creates a powerful demand engine for semiconductor, equipment, construction and utility names tied into the AI supply chain. On the risk side, cash that once funded buybacks is being diverted into long‑dated projects where the payoff is still uncertain.

The key question is whether future AI revenues and productivity gains will justify today’s capex. If they do, this could be the backbone of a multi‑year earnings upgrade cycle. If they don’t, investors may discover they have financed one of the most expensive capacity gluts in market history.