39.6 — the S&P 500’s CAPE ratio in early May — marks its richest valuation since September 2000, after the index quickly erased a March selloff tied to oil above $100.
The Fed’s May financial stability report said Middle East tensions and elevated oil prices could reignite inflation and force tighter policy even if growth weakens, a risk Powell also highlighted.
Higher rates would pressure stocks through weaker earnings, softer demand and stronger bond competition; after the last four Fed hiking cycles since 1999, the S&P 500 fell over the next three months, averaging a 7% drop.
History also looks poor from current valuation levels: when CAPE has been above 39, the S&P 500’s average return was negative over one, two and three years, though faster AI-driven earnings growth could soften that signal.
As US tech stocks soar, are overlooked international markets and value sectors the real safe havens for investors?
Why is consumer sentiment at historic lows if the AI-driven market reflects a strong and expanding economy?
Are profitable AI giants creating a new market reality or just repeating the dot-com bubble with more cash?
S&P 500’s Shiller CAPE Nears Record Highs: Is a Market Correction Looming in 2026?
Overview
As of April 2026, the Shiller CAPE ratio for the S&P 500 has surged to between 38 and 40, standing 134% above its historic geometric average of 16.2. This marks only the third time in history such high levels have been reached, previously seen before the Great Depression and the dot-com bubble. These extraordinary valuations signal a period of significant investor caution and place the current market in a rare and potentially precarious position. The report highlights that such elevated CAPE ratios are strong warning signals, suggesting increased risk of poor future returns or market corrections.