P/E Ratio
The price-to-earnings ratio compares a company’s share price to its earnings per share. It is a shorthand for how much investors are paying for each unit of profit.
The calculation is straightforward: share price divided by earnings per share. A company trading at 20 times earnings means investors are paying 20 for every 1 of annual profit. A trailing P/E uses the last twelve months of reported earnings; a forward P/E uses analysts’ forecasts, which may not materialise.
A high P/E is not automatically expensive and a low P/E is not automatically cheap. A high ratio usually reflects an expectation of rapid profit growth. A low one can signal genuine value, or it can signal that the market expects earnings to fall — the so-called value trap.
P/E is only meaningful in context. Comparing it against the same company’s history, against direct competitors, and against the sector average tells you far more than the number alone. Technology and utility companies sit at structurally different levels for good reason.
The ratio breaks down entirely when a company has no earnings, since dividing by zero or a negative number produces nothing useful. Loss-making businesses are usually assessed on revenue multiples or cash flow instead.
TrustFinance News covers earnings season across major markets, tracking how reported results reshape the valuations investors are willing to pay.