S&P 500 shows high P/E caution

Immune cells have receptors on their surface that help them decide what to attack. In markets, valuation ratios do something similar — they don’t tell you exactly when trouble starts, but they do tell you when optimism is getting expensive. That is the setup now. The S&P 500’s forward 12-month P/E has climbed to 20.9, above its 5-year average of 19.9 and 10-year average of 18.9, even as first-quarter earnings have been coming in unusually strong. ### Why are people suddenly talking about P/E again? Because the market has managed to get more expensive at the same time earnings have been good. That sounds contradictory, but it isn’t. A P/E ratio rises when prices run ahead of earnings expectations, and that is basically what has happened as investors kept bidding up large-cap U.S. stocks. FactSet’s latest earnings update shows the index trading above both its 5- and 10-year valuation norms. ### Doesn’t strong earnings make a high P/E less scary? A little — but not automatically. Q1 results have been strong enough to justify some of the rally. FactSet says 84% of S&P 500 companies that had reported by May 1 beat EPS estimates, above both the 5-year and 10-year averages, and the aggregate earnings surprise was 20.7%, the biggest since Q1 2021 if it holds. But valuation risk is about what happens next, not what just happened. If earnings stay hot, the market can grow into the multiple. If they cool, the same multiple starts to look stretched fast. ### So what is the actual caution signal? The caution signal is not “the market must crash.” It’s narrower than that. It says future returns tend to get more fragile when you pay well above normal for each dollar of expected earnings. The higher the starting multiple, the less room investors have for disappointment — a weaker quarter, slower guidance, higher rates, or a policy shock can do more damage because the market is already priced for a lot going right. ### Why does Berkshire keep showing up in this conversation? Because Berkshire looks like the opposite of an overextended market trade. In its May 2 first-quarter release, Berkshire posted operating earnings of $11.35 billion, up from $9.64 billion a year earlier, and ended March with a record $397.38 billion in cash and short-term investments. That combination — solid operating profit plus a giant liquidity pile — makes investors see it as dry powder in corporate form. ### Is that cash hoard actually bullish or bearish? Both, turns out. It is bullish in the sense that Berkshire has enormous flexibility if assets get cheaper or markets break. But it is also a little bearish as a signal. Berkshire usually does not sit on nearly $400 billion because bargains are everywhere. A cash pile that large suggests management is struggling to find enough opportunities that meet its return bar. That is not a market-timing call, but it is a useful read on how scarce obvious value looks right now. ### What are investors doing with that read? They are not necessarily fleeing equities. They are tilting. That means more interest in lower-P/E parts of the market, dividend-heavy funds, and balance-sheet-rich names that can hold up if multiples compress. Some investors are also treating nontraditional assets like Bitcoin as a separate hedge, though that is a different bet entirely — more about liquidity and debasement fears than valuation discipline. Berkshire fits the classic defensive bucket better because its appeal comes from cash, earnings power, and optionality. ### Why does the Nasdaq angle matter too? Because the same valuation story is even more concentrated there. The Nasdaq-100 has surged over the past year, and that strength has been driven heavily by a small group of giant tech names. When leadership narrows like that, the index can keep levitating for a while — but it also means any stumble by the leaders hits harder. The issue is less “tech is bad” than “crowded winners leave less margin for error.” ### Bottom line This is not a call that the rally is fake. Earnings have been real. But the market is now expensive enough that good news has less cushioning power. That is why people are talking about P/E caution — not because valuation predicts the exact day of a selloff, but because it changes how painful disappointment can be.