Stocks Are Getting Cheaper Even As Indices Rally

The S&P 500 continues to reach record highs, while its forward P/E has declined from 20.4x to roughly 19.0x as earnings estimates fell; the multiple is now below its five- and ten-year averages. Microsoft, Alphabet, Amazon, and Meta each reported double-digit revenue growth, and most trade near or below their historical valuations.

Analysis

The valuation narrative needs an arithmetic check before it becomes a “cheap market” thesis: with price held constant, falling forward earnings estimates push the forward P/E higher, not lower. If the index is simultaneously at records and the reported multiple has compressed, price, estimate vintage, index composition, and measurement dates must be reconciled. Until then, the below-average multiple is not a reliable valuation anchor.

The more useful signal is dispersion risk. Double-digit revenue growth at Microsoft, Alphabet, Amazon, and Meta does not establish earnings durability: AI infrastructure spending, depreciation, and competition for monetization can weaken incremental returns even while sales grow. That leaves the index vulnerable if estimate cuts broaden beyond those firms; it also means aggregate valuation can conceal very different cash-flow trajectories. A sustained decline in forward estimates would matter more than the headline P/E comparison.

Over days, record highs can support momentum and passive inflows, but leave little protection if revisions accelerate. Over 1–3 months, track estimate breadth, operating-margin guidance, and capex-to-cloud/ad monetization evidence. Over 6–18 months, the key risk is that AI-related investment converts to revenue without commensurate free cash flow. The contrarian point is not that equities are clearly expensive or cheap; it is that a low historical multiple may be a denominator/data artifact, while revenue growth alone may overstate earnings quality.

Key Decisions for Investors

• Do not add broad S&P 500 exposure solely on the reported discount to historical forward P/E. First reconcile comparable index price and forward-EPS series across the stated dates; a falling EPS denominator should raise, not lower, the multiple absent a larger price or composition effect.
• Use estimate breadth as the near-term trigger: if forward EPS revisions turn more broadly negative while the index holds records, reduce unhedged index beta or consider defined-risk downside protection rather than treating the valuation statistic as support. Reassess if revisions stabilize and margins hold.
• Keep Microsoft, Alphabet, Amazon, and Meta on a relative-value watchlist, not an automatic long basket. Prefer names whose next guidance shows monetization and margins keeping pace with infrastructure spend; revenue growth without those confirmations is not enough. Verify company-level earnings revisions, capex, and free-cash-flow trends before sizing.
• Falsify the cautious view if matched-date valuation data confirms genuine multiple compression alongside stable or improving forward earnings, and subsequent guidance supports margins. Conversely, broader estimate cuts or weaker margin guidance would strengthen the downside-risk case.