Operating Margin
The share of sales left as operating profit after core-business costs — the company's core-business profitability.
In plain terms
If a cafe sells $10,000 a month and has $2,000 left after paying for beans, rent, and wages, its operating margin is 20%. It is "what percent of sales is left as profit from the core business."
It excludes items unrelated to the core business, like interest and taxes, and looks only at what the actual trade kept. So it shows "the strength of the core business" best.
What it tells you
A high operating margin means the company can charge a full price (pricing power) or controls costs well. Because competition erodes margins, a high and steady operating margin is a clue that the company holds an edge in its market.
The direction of operating margin over time (improving or worsening) shows whether the company is in a phase of tightening efficiency or giving up margin to win share.
Formula
operating margin = operating profit ÷ revenue × 100
What high or low means
A higher operating margin is read as better core-business profitability. An improving trend can be read as a sign of stronger cost efficiency or pricing power.
Normal levels vary widely by industry (software routinely runs in the 30s percent, retail typically single digits). Position within the same industry and the trend matter more than the absolute number.
Comparing across industries is the most common mistake. A supermarket (keeps little, sells a lot) and a luxury brand (keeps a lot, sells little) run different business models, so you cannot rank them on operating margin alone. A low margin is not necessarily bad — it may be normal for that industry.
One-off costs (restructuring, lawsuit settlements, asset write-downs) can press down operating profit in a given quarter and make the margin drop sharply. Read several quarters' trend rather than one quarter to see the real flow.
When a company reports a separate "adjusted operating profit" excluding items like stock the company gave employees instead of cash (stock-based compensation), the margin can look better than it really is. You need to check whether the margin a company touts is on an accounting basis or an adjusted figure.
Metrics to read alongside
See it in real stocks
Search US stocks on Stocklore to see Operating and other financial metrics alongside the sector average.
This explanation is for information and reference only and is not a recommendation to buy or sell any security. Investment decisions and their consequences are your own.