P/E Ratio
ValuationPrice-to-Earnings — how much investors are paying for every $1 of profit the company generates. The most widely used valuation metric on earth.
The Price-to-Earnings ratio expresses the market's valuation of a company as a multiple of its trailing or forward earnings per share. Trailing P/E uses the last twelve months of reported EPS; forward P/E uses analyst consensus estimates for the next twelve months. A P/E of 20× means investors are willing to pay $20 for every $1 of annual earnings — implying a theoretical 5% earnings yield (1 ÷ 20). P/E is most meaningful as a relative measure: against the company's own historical range, against sector peers, and against the broader market average (the S&P 500 has historically traded at 15–20× earnings). A high P/E relative to peers implies either a growth premium or overvaluation; a low P/E implies either undervaluation or a structural concern the market is pricing in.
Share Price is the current market price per share. EPS is earnings per share — trailing (last 12 months) or forward (next 12 months estimated). The ratio tells you what dollar multiple of annual earnings the market assigns to the stock.
Potentially undervalued or out of favour. Common in mature, slow-growth sectors (utilities, energy). Either a value opportunity or a value trap — verify earnings quality and growth trajectory.
Broadly in line with long-run S&P 500 averages. Fair value territory for a typical business with moderate growth. Neither a screaming buy nor obviously overpriced.
Growth premium priced in. Market expects earnings to expand significantly. Justified for compounding businesses with durable competitive advantages — dangerous for companies that don't deliver.
P/E is the starting point of almost every equity valuation conversation. It anchors relative value comparisons, informs sector rotation decisions, and signals market sentiment on a company's growth prospects. A P/E expansion (multiple re-rating upward) can drive returns even without earnings growth — and a P/E compression can destroy returns even in a growing business. Understanding where P/E is relative to history is as important as the absolute number.
P/E is useless in isolation and meaningless for unprofitable companies. A stock with negative EPS has no P/E — you can't divide by zero or a negative number and get something meaningful. For loss-making growth companies, use Price-to-Sales or EV/Revenue instead. Also: a low P/E on a cyclical company at peak earnings is often a sell signal, not a buy signal — the 'E' is about to fall, which means the P/E will spike even if the price stays flat.