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The most widely known metric in investing — what it actually measures, when a low ratio is an opportunity versus a warning sign, and how StockIQ uses it.
The Price-to-Earnings ratio (P/E) is a stock's price divided by its earnings per share (EPS). If a stock trades at $100 and its annual EPS is $5, the ratio is 20 — investors are willing to pay $20 for every $1 of annual earnings. It's effectively a way of asking: how many years of earnings (at the current rate) would it take to 'earn back' the price you paid.
A ratio that's low relative to its industry can signal a cheap stock the market hasn't priced correctly yet. But it can equally signal that the market expects earnings to decline — companies in declining industries, or facing a structural problem, tend to trade at low multiples precisely because no one wants to pay up for earnings expected to erode. The ratio alone doesn't distinguish between the two cases.
Companies with high expected future growth tend to trade at higher multiples — investors are willing to pay today for earnings that will grow in the future. That's why comparing P/E only makes sense between similar companies (same industry, similar growth rate), not between a fast-growing tech company and a stable utility.
P/E is based on accounting earnings, which can be affected by one-time events (an asset sale, a tax write-off) that don't reflect true operating performance. A company with negative earnings (a loss) doesn't get a meaningful P/E at all. It's a useful tool, but never a single metric to base a decision on.
StockIQ checks the P/E ratio as part of the Fair Value category (15% of the score), compared against the industry rather than as an absolute number, alongside a DCF model and asset-based value (NAV) — precisely to avoid relying on a single multiple that can mislead on its own.
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The information in this guide is intended for general educational purposes only and does not constitute investment advice. Full details on the disclaimer page.