How do you value a company with no profit?
A growth company that is not yet profitable has no meaningful P/E ratio. A common substitute is the price-to-sales ratio (P/S): market capitalization divided by annual revenue, or how much the market is paying for each dollar of sales.
P/S is helpful for comparing companies whose earnings are absent or temporarily distorted, but it says nothing about how much of that revenue becomes profit or cash. This guide covers how to calculate it, the trap of a ratio that ignores margins, and how to read it with growth and cash conversion, using hypothetical numbers.
P/S and EV/sales
P/S is market cap divided by revenue, or share price divided by revenue per share. Revenue is less affected by accounting adjustments than net income and exists even for loss-making companies. FINRA's guide to evaluating stocks covers P/E and EPS; P/S follows the same logic with sales in place of earnings.
Revenue, however, ultimately supports both shareholders and lenders. For companies with significant debt, enterprise value (market cap plus net debt) divided by revenue, EV/sales, gives a fairer comparison. Two companies with the same market cap but different debt loads are not being valued the same.
The trap of ignoring margins
The biggest weakness of P/S is that it ignores how much profit each dollar of sales produces. In the hypothetical example below, Company B looks half as expensive on P/S, but adding operating margin reverses the conclusion.
| Company | Market cap | Revenue | P/S | Operating margin | Operating income | Market cap ÷ operating income |
|---|---|---|---|---|---|---|
| A | 1,000 | 500 | 2.0× | 20% | 100 | 10× |
| B | 600 | 600 | 1.0× | 3% | 18 | ≈ 33× |
B looks cheaper on sales, but it is more than three times as expensive relative to the operating profit it actually earns.
Revenue size and quality
Recurring subscription revenue and one-off project revenue are not worth the same. When customers stay and revenue repeats each year, future cash flow is easier to predict, and markets tend to pay higher multiples for it.
Gross versus net revenue matters too. A marketplace that records the full transaction value as revenue can report several times the sales of one that records only its commission, even for the same economic business. Under IFRS 15 and ASC 606 this depends on whether the company acts as principal or agent, so check that companies recognize revenue the same way before comparing P/S.
Growth and cash conversion
A high P/S usually reflects strong growth and an expectation that margins will expand. If revenue grows 40% a year, a P/S of 10 today could look much lower against revenue a few years out. If growth slows, the multiple can compress quickly and the share price can fall sharply.
Read P/S together with revenue growth, gross margin, and operating cash flow. Fast-growing revenue combined with low gross margin and ongoing cash burn can mean losses widen as sales grow.
Common misreadings
"A P/S below 1 is cheap" means little in low-margin industries. A retailer with a 2% to 3% operating margin can be expensive on profit even at 0.5 times sales, while a software company with a 30% margin can be reasonably valued at 8 times sales.
"Loss-making companies can only be valued on sales" is only half true. Even without profit, gross margin, revenue per customer, and the pace of cash burn show whether profit is likely to arrive. As a hypothetical example, a company with a 70% gross margin and shrinking cash burn deserves a very different reading from one with a 10% gross margin and growing burn, even at the same P/S.
Checking the inputs in a 10-K
Investor.gov's guide to the 10-K points to the financial statements and the MD&A, where revenue drivers are explained. A practical order:
- Calculate P/S from market cap and trailing four-quarter revenue, and EV/sales by adding net debt.
- In the revenue note, check gross versus net recognition and the share of recurring revenue.
- Tabulate revenue growth, gross margin, and operating margin for three to five years.
- From the cash flow statement, check operating cash flow and capital spending to see whether sales generate cash.
- Compare P/S and margins with peers that have similar business models.
Limits of P/S
Because P/S skips the outcomes that matter, profit and cash, it rarely settles on its own whether a stock is cheap or expensive. Normal margins differ by industry, so cross-industry P/S comparisons are of limited use.
The companies in the table are hypothetical. For real decisions, use the latest filings with their dates, and treat P/S as a question: how much future profit is the market assuming these sales will produce?