What is in the denominator?
Check which earnings belong to the owners of the shares being analysed. In a consolidated group, the whole result need not belong to the parent’s shareholders. Check basic or diluted EPS and the period. IAS 33 links EPS to the relevant result and share count; dividing total profit by an arbitrary number of securities is not a substitute.
A denominator near zero is especially dangerous. At the same price, a small change in results can turn a huge positive multiple into a negative one. That crossing does not mean an instant move from expensive to cheap; it is a breakdown of ordinary comparison near zero.
The conditional-table paradox
Two fictional shares both cost RUB 100. The first has EPS of −RUB 5 and the second −RUB 20, giving P/E of −20 and −5. Choosing the lower number makes the first look cheaper; choosing the number closer to zero makes the second, with the larger loss, win. Neither rule gives a sensible value comparison.
If the first company reduces its loss to RUB 1 per share, its ratio becomes −100. Improving earnings makes the ratio more negative. If EPS becomes positive RUB 1, P/E is 100. These transitions describe fraction behaviour around a zero denominator, not standalone buy or sell signals.
The loss mechanism determines the next model
A one-off cost, cyclical downturn, early-stage product and chronically broken economics require different models. For a one-off event, document the adjustment and test repeatability. For a cyclical downturn, study normal prices and costs. For a new business, test the path to positive cash flow: customers, unit contribution, resources and funding dates.
Do not replace negative earnings with a positive figure “in a few years” and declare the problem solved. The company needs money before then; financing may increase debt or share count and change the portion available to today’s owner. Start with the cause, not a mechanically growing positive denominator.
An alternative must not hide the problem
Revenue multiples can be used while earnings are negative, but equal revenue may require different costs and capital expenditure. A positive denominator does not automatically make the multiple reliable. Include future margin mechanics, required funding and risk.
A useful table entry may be “not applicable for ordinary P/E comparison,” with the reason and next method. If a forecast positive earnings figure is used, show who estimated it, its date and required events, while retaining the current loss. Loss-making status does not prove zero value, but the failure of one ratio does not justify any price.
Further controls
Recovery requires a sequence of operating changes, not only a claim that the loss is temporary. A completed facility launch needs achievable utilisation, contractual prices and a maintenance budget. If sales are expensive, higher volume may require more funding rather than automatically producing profit.
Check which owners receive the negative result, especially with multiple capital classes and subsidiaries. If the EPS methodology is undisclosed, do not use the negative multiple for comparison until it is reconciled. Keeping a “why the method is inapplicable” column can be more accurate than a long negative number with false economic meaning.