Definition

Operating leverage

The pattern behind a widening operating margin: revenue growing faster than the cost of running the business. You read it in the operating-expense ratio — operating expenses as a share of revenue — falling over time, so each incremental sales dollar carries more of itself down to operating income.

Formula

Opex ratio = Operating expenses ÷ Revenue  (falling ratio year over year = operating leverage)

Drivers — what actually moves it

Revenue growth: the numerator of leverage — fixed costs dilute only when the top line moves.
Cost structure: the more fixed the expense base, the harder revenue growth pulls the ratio down — and the harder a downturn pushes it up.
Investment cycles: deliberate R&D or sales build-outs raise the ratio today for capacity tomorrow; filings show the spend by line.

Where to find it in the filing

Income statement (Consolidated Statements of Operations). 10-K Item 8 — operating expenses and revenue for both years of the same filing; the ratio's direction is the leverage read.

XBRL concepts Echelon grounds to: OperatingExpenses · Revenues · RevenueFromContractWithCustomerExcludingAssessedTax

Sector caveats — where this breaks

Leverage cuts both ways: the same fixed base that expands margins in growth compresses them when revenue falls.
Filers that report no single OperatingExpenses total require summing the expense lines — Echelon refuses rather than guessing a partial sum.

Drill it in a live lesson Operating margin Revenue growth Gross margin R&D intensity

Drill operating leverage on another filer

Graded exercises that use this metric — each one against a different company's own filed figures.

Apple's operating leverage: the opex ratio, two years Adobe's operating leverage: the opex ratio, two years Analog Devices' operating leverage: the opex ratio, two years Autodesk's operating leverage: the opex ratio, two years Applied Materials' operating leverage: the opex ratio, two years AMD's operating leverage: the opex ratio, two years

Educational use only — not investment advice. Figures come from public SEC filings; Echelon teaches you to analyze data, it never recommends buying or selling any security.