How JSE investors use Price-to-Sales (P/S) Ratio to Value Stocks

The price-to-sales (P/S) ratio is the valuation tool investors reach for when the more famous price-to-earnings ratio stops working — loss-making growth companies, cyclical businesses at the bottom of their cycle, or turnarounds where earnings are temporarily ugly. It values a company against its revenue, which is harder to manipulate and less volatile than profit. Here's how JSE investors calculate it, read it, and avoid being fooled by it.

What the P/S ratio is

P/S = market capitalisation ÷ annual revenue (equivalently: share price ÷ revenue per share). A P/S of 1 means you're paying R1 for every R1 of yearly sales; a P/S of 0.4 means 40 cents per rand of sales. Because it uses the top line, it can value companies that have no earnings at all — where P/E is literally incalculable.

Calculating it: a worked example

Suppose a JSE retailer has 500 million shares trading at R40, so a market cap of R20 billion, and reported R50 billion in annual revenue. P/S = 20 ÷ 50 = 0.4. Whether 0.4 is cheap depends on what that revenue earns: a grocery retailer keeping 2 cents of profit per rand of sales deserves a much lower P/S than a software firm keeping 25 cents. That link — P/S only means something next to profit margins — is the single most important idea in this article.

Where P/S beats P/E

• Loss-makers and turnarounds: a company posting losses has no meaningful P/E; P/S lets you value the business on what it sells while the recovery plays out;
• Cyclicals: miners and industrials swing from bumper profits to losses across a cycle. Earnings-based multiples whipsaw; revenue is steadier, so P/S gives a more consistent yardstick through the cycle;
• Manipulation resistance: accounting choices — depreciation policies, provisions, once-offs — can dress up earnings; revenue is harder (not impossible) to flatter;
• Early-stage growth: companies reinvesting everything into growth show weak earnings by design; P/S paired with revenue growth tells you what the market is paying for that growth.

Where P/S will mislead you

• Ignoring margins: comparing a bank's P/S to a retailer's is meaningless — different industries convert sales to profit at wildly different rates. Only compare within a sector;
• Ignoring debt: P/S uses market cap and skips the balance sheet entirely. A company drowning in debt can look "cheap" on P/S while equity holders are last in line. Check debt levels — or use EV/Sales, which adds net debt to the price;
• Revenue quality: low-margin, one-off or pass-through revenue isn't worth the same as recurring, high-margin revenue — a rand of subscription software sales deserves a higher multiple than a rand of commodity trading turnover;
• The value trap: a persistently low P/S sometimes just marks a business the market correctly believes is dying. Cheapness alone is not a thesis.

Using P/S in a JSE workflow

1. Screen within sectors: rank JSE retailers, or miners, or tech counters against each other — never across sectors. Company financials and share data are on our JSE markets pages;
2. Pair it with margins and growth: the practical trio is P/S + operating margin + revenue growth. A low P/S with stable margins and growing sales is interesting; a low P/S with collapsing margins is a warning;
3. Compare against the company's own history: a stock trading well below its own five-year average P/S invites the question "what changed?" — sometimes the answer is opportunity, sometimes it's a structural break;
4. Confirm with cash: before buying anything that screens cheap, check cash flow — revenue that never becomes cash is a story, not a business.

Sector intuition: what “normal” looks like

Because P/S only means something next to margins, it helps to carry a rough mental map of how sectors differ:

• Food and general retail: huge revenues, thin margins — P/S ratios typically sit well below 1, and small margin changes move fair value a lot;
• Mining and resources: revenue swings with commodity prices — P/S must be read against where the cycle sits, not as a static number;
• Banks and insurers: “revenue” is a slippery concept (interest income vs premiums vs fees) — P/S is rarely the right tool; price-to-book and dividend measures dominate;
• Software and platforms: high gross margins and recurring revenue justify multiples of revenue that would be absurd for a grocer;
• Healthcare and pharma: regulated pricing and mixed business models — mid-range multiples, best compared peer-to-peer.

The map matters because most “cheap stock” screens are really sector mix in disguise: a screen full of low P/S names is usually a screen full of retailers and miners, not a list of bargains.

A practical screening walkthrough

1. Pick one sector on the JSE board — say food retailers;
2. Compute P/S for each from market cap and latest annual revenue;
3. Rank them, then put operating margin and three-year revenue growth alongside;
4. Interrogate the outliers, not the average: the cheapest name on the list — is the margin collapsing, is debt heavy, is a corporate action distorting the number? The most expensive — is growth genuinely faster, or is it just a crowd favourite?
5. Take the two most interesting names into deeper work: cash flows, debt maturity, management track record. The multiple starts the conversation; it never finishes it.

P/S vs the other multiples

• P/E: the default when earnings are stable and positive — more meaningful, less robust;
• EV/EBITDA: the dealmaker's multiple — capital-structure neutral, good for comparing leveraged businesses;
• P/B (price-to-book): banks and insurers, where balance-sheet value drives the business;
• P/S: the top-line lens — strongest for loss-makers, cyclicals and growth stories, always paired with margin analysis.

Professional investors rarely rely on one multiple; they triangulate. If P/S, EV/EBITDA and a discounted view of cash flows all say cheap, the case is strong. If only P/S does, you've usually found low margins or high debt — not value.

JSE-specific wrinkles

• Dual-listed and rand-hedge counters: many large JSE companies earn most revenue offshore; their P/S in rand mixes business performance with currency translation. Compare such companies in their reporting currency where possible, and remember a weakening rand mechanically inflates reported revenue without improving the business;
• Small-cap illiquidity: thinly traded small caps can show “cheap” multiples that are really a liquidity discount — the price would move against you long before you built a position;
• Sparse peer groups: some JSE sectors have only two or three listed players, which makes “sector average P/S” statistically meaningless — lean on the company's own history and global peers instead;
• Corporate actions: unbundlings and disposals (a JSE speciality) can leave trailing revenue figures describing a company that no longer exists in that shape — always check for recent corporate actions before trusting a screen.

A note on data

Use annual (or trailing twelve months) revenue from the company's results, and today's market cap. Beware stale screens after results season: a P/S computed on last year's revenue can be badly wrong for a company whose sales just jumped or halved. And for rand-hedge counters earning globally, remember currency moves flow through revenue too — part of a "cheap" P/S can simply be the rand.

Putting it together: a triangulation sketch

Imagine two JSE clothing retailers. Retailer A trades on a P/S of 0.5 with operating margins that have slipped for three straight years and rising debt; Retailer B trades on 0.9 with stable margins, net cash and modest growth. The naive screen says A is "cheaper". The triangulated read says B is the better business at a fair price, while A's discount is the market pricing real deterioration. Now invert it: if A's margin slide traces to a fixable, disclosed problem — a logistics migration, a once-off store rationalisation — and the balance sheet can carry the repair, the low multiple becomes a genuine turnaround candidate. Same two numbers; opposite conclusions; the difference is the work behind them. That's the honest role of every valuation multiple: a sorting tool for where to spend your research hours, never a verdict.

Frequently asked questions

What is a good P/S ratio?

There's no universal number — it depends on the sector's profit margins and growth. Low-margin retailers normally trade well under 1; high-margin software businesses can justify several times revenue. Compare within a sector and against the company's own history.

Why use P/S instead of P/E?

Because P/E fails when earnings are negative, distorted or cyclical. Revenue is steadier and harder to manipulate, so P/S provides a usable valuation lens where P/E can't.

What are the main weaknesses of the P/S ratio?

It ignores profitability and debt. A low P/S company with thin margins and heavy borrowing can be far more expensive, in real terms, than a high P/S company with fat margins and a clean balance sheet.

Where do I find revenue figures for JSE companies?

In the annual and interim results companies publish on SENS and their investor-relations pages. Use the income statement's revenue line for the trailing twelve months, and pair it with today's market capitalisation.

Educational content, not investment advice. Do your own research or speak to a licensed financial adviser before investing.