Investors withdrew more than $32 billion from US stock funds last week, the largest single-week outflow in nine months, coinciding with Brent crude above $110 a barrel and the ten-year Treasury yield nearing 5 percent for the first time since October 2023.

The macro backdrop

Oil’s move past $110 has revived the inflation-to-rates transmission chain that plagued 2022. Higher energy costs feed headline inflation, which pressures the Federal Reserve to keep policy restrictive. Futures markets now price a high probability of a federal funds rate increase this week, which would be the first hike in three years. The ten-year yield at 5 percent raises the discount rate on future earnings, making current S&P 500 multiples harder to defend.

The AI factor

A new variable has entered the calculus. Executives from several leading AI firms have publicly urged a development slowdown to address safety concerns. The market has taken this as a signal that the infrastructure spending boom, data centers, chips, power, which has underpinned the large-cap rally for years, could decelerate. If capital expenditure forecasts are revised lower, earnings estimates for the biggest index constituents would follow.

Rotation not capitulation

The selling has not been indiscriminate. Outflows are concentrated in large-cap funds, while small-cap and all-cap vehicles such as the Vanguard Total Stock Market ETF continue to attract assets. The pattern suggests portfolio repositioning rather than a broad risk-off move, consistent with the sector rotation visible throughout 2026.

Earnings still support the case

Consensus forecasts still show S&P 500 earnings growing well into double digits both this year and next. That fundamental backdrop remains the primary argument against treating the flow data as a predictive signal. The article’s author, who holds the Vanguard S&P 500 ETF with a 10-to-15-year horizon, argues that short-term flow volatility is noise and that market timing typically destroys more value than it preserves.

The long view

Whether the AI spending cycle has genuinely peaked or merely paused is the swing factor for the next quarter. Until earnings revisions turn negative, the outflow reads as a sentiment event, not a fundamental break.