Price-to-Sales Ratio
The price-to-sales ratio (P/S) compares a company's market capitalization to its annual revenue, providing a valuation yardstick particularly useful for companies that are not yet profitable.
The price-to-sales ratio was popularized by investor Kenneth Fisher in the 1980s as a tool for identifying undervalued stocks, especially in sectors where earnings are cyclically suppressed or where companies are reinvesting heavily and not yet profitable. By anchoring valuation to revenue rather than earnings, P/S avoids the mathematical impossibility of a P/E ratio for money-losing companies.
During the dot-com bubble of the late 1990s and the pandemic-era growth stock frenzy of 2020-2021, P/S ratios for software and tech companies soared to extraordinary levels — in some cases 40, 50, or even 100 times revenue. The subsequent collapse in these multiples from 2022 onward reminded investors that revenue alone does not create value; the path to profitability and cash generation ultimately determines whether high P/S multiples are justified.
Salesforce is an instructive example. In its early years, Salesforce traded at P/S multiples of 5-10× while losing money, because investors were paying for future margin expansion. As cloud software matured and competition for CRM customers intensified, multiple compression brought P/S ratios closer to 6-8× for the broader SaaS sector. Companies that demonstrated a clear path to free cash flow generation were rewarded with premium multiples; those that could not were repriced aggressively lower.
P/S is most appropriate when earnings are temporarily depressed or negative, when the business model has a clear path to margin expansion, or when comparing companies within the same industry where gross margins are similar. Comparing P/S ratios across industries is less useful: a grocery chain with 25% gross margins and a software company with 75% gross margins should trade at very different P/S multiples even if they have similar EPS growth prospects, because the software company converts a much higher share of each revenue dollar into profit.
Enterprise value-to-sales (EV/Sales) is often preferred over P/S for companies with significant debt or cash positions, because it adjusts for capital structure. For a cash-rich company like Apple, P/S understates valuation attractiveness; EV/Sales neutralizes this by stripping net cash from the numerator before dividing by revenue.