There is no single PE ratio [Price-to-Earnings ratio] that automatically means bullish or bearish, but investors use ranges as a rough valuation signal.
For SPY [SPDR S&P 500 ETF Trust], the better reference is the S&P 500 PE ratio, because SPY tracks the S&P 500.
Simple PE ratio guide for the S&P 500
| S&P 500 PE Ratio | Market Reading | Meaning |
|---|---|---|
| Below 12 | Very cheap / often bullish long term | Usually happens during fear, recession, or crisis. Future long-term returns may be attractive. |
| 12–16 | Attractive | Below historical average; generally favorable for long-term buyers. |
| 16–20 | Normal / fair | Close to the long-term historical range. |
| 20–25 | Expensive | Market needs strong earnings growth to justify prices. |
| 25–30 | Very expensive | Risk of lower future returns increases. |
| Above 30 | Potentially overvalued / caution | Often seen during bubbles, recessions with depressed earnings, or very optimistic periods. |
As of the latest available data I found, the S&P 500 trailing PE ratio is about 31.83, while its long-term mean is about 16.21 and median is about 15.07. That means the market is expensive by historical trailing PE standards, not necessarily immediately bearish, but it does suggest lower margin of safety. (Multpl)
The Shiller PE [Cyclically Adjusted Price-to-Earnings ratio] is also elevated, around 42.05, compared with a historical mean of about 17.36 and median of about 16.07. That is a stronger warning sign for long-term valuation risk. (Multpl)
But PE alone should not decide bullish or bearish. A high PE can stay high for years if earnings are growing fast, interest rates are low, and investor optimism is strong. For example, recent market optimism has been supported by strong earnings expectations and AI-related growth, even though valuations remain elevated. (Reuters)
So, today’s reading is: SPY/S&P 500 looks bullish in price momentum, but expensive in valuation. That combination means the market can keep rising, but future returns may be more vulnerable if earnings disappoint.
