Revenue growth alone is an incomplete account of performance. A larger sales base can coexist with lower profit. FirmLens places revenue, net income and operating income together, but those figures do not reveal cash movements or the cause of a change.
A worked example
This is a fictional business, not a real company’s results. Assume both years use the same currency, annual period and consolidated scope. All amounts below are in millions.
| Measure | Prior year | Current year |
|---|---|---|
| Revenue | 100 | 120 |
| Operating income | 10 | 9 |
| Operating margin | 10.0% | 7.5% |
Revenue grew by (120 − 100) / 100 = 20%. Operating income changed by (9 − 10) / 10 = −10%. The new margin is 9 / 120 = 7.5%, a decline of 2.5 percentage points. A percentage-point change is different from a percentage change.
What the calculation cannot tell you
The example establishes that operating income is a smaller share of revenue. It does not establish whether costs, a one-time charge, expansion spending or another change caused it. Read the expense details and notes before assigning a cause. A plausible explanation is still only a hypothesis.
Check earnings and cash separately
Net income and operating income are different measures. Profit recognition and cash movements can also occur at different times. Use the cash flow statement to investigate cash movements. The SEC’s financial-statement guide explains the roles of the statements. Cash flow is not currently included in FirmLens summary cards; follow the annual filing link.
Check the denominator and missing values
A prior revenue of zero does not support the same growth formula. Missing values should never be replaced with zero to force a comparison. FirmLens leaves growth unavailable when the comparable prior annual revenue is absent or nonpositive. For a move between profit and loss, reading the amounts and direction is clearer than relying on a single percentage.
This exercise explains arithmetic and interpretation. It does not value a security or predict future investment returns.