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S&P 500 forward price‑earnings ratio 21 vs trailing 28 shows market relies on strong near‑term earnings; learn why analysts warn of a rare valuation spread and
The S&P 500 is trading at a forward price‑earnings (P/E) ratio of 21, well below its trailing P/E of 28, a spread that historically only appears at market extremes such as the year 2000【1】.
This gap implies investors are betting on unusually strong earnings growth over the next 12 months, a scenario that has materialized in fewer than one in five quarters since 1989【1】.
| At a glance | |
|---|---|
| Forward P/E (12‑mo) | 21 |
| Trailing P/E (LTM) | 28 |
| Historical spread rarity | Only seen at extremes like 2000 |
| Earnings growth implied | >8% annual growth, rare outside post‑recession rebounds |
The forward P/E uses the same price numerator as the trailing P/E, so the difference reflects the gap between last‑twelve‑month (LTM) earnings and next‑twelve‑month (NTM) earnings expectations【1】. Professors Aswath Damodaran and Itzhak Ben‑David explain that the spread is essentially a direct measure of expected earnings growth, and that such a wide gap has historically coincided with periods of earnings rebounds after sharp declines (1994‑95, 2003‑04, 2009‑11, 2021‑22)【1】.
Ben‑David notes that forward P/E looks “reasonable” only because it incorporates earnings that have not yet occurred, and past episodes with a similarly wide spread ended with earnings disappointments, multiple‑year valuation compressions, or both【1】. A 2024 working paper with Alex Chinco found that analysts often set price targets by applying trailing P/E multiples to forecast earnings, effectively restating optimism rather than providing an independent valuation check【1】. Additional research by Gao and Wu (2008) suggests trailing P/E outperforms forward P/E in predicting future growth, reinforcing the view that a low forward P/E does not guarantee cheapness【1】.
The key question remains whether companies can deliver the near‑term earnings surge that the current forward P/E assumes; a failure would likely compress valuations and test the market’s resilience.
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AI-assisted synthesis by the TrendWatcher Editorial Desk · sourced from 2 outlets · Jul 10, 2026 · How we report
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