What Is the PSR (Price-to-Sales Ratio)
A company running a loss has no profit, so you can't calculate a P/E ratio. So how do you measure the price tag of such a growth company? The PSR, which measures it by revenue, enters the picture.
The PSR formula and its use
The PSR (Price-to-Sales Ratio) is a metric that compares the share price against the company's revenue.
PSR = market cap ÷ annual revenue (or share price ÷ revenue per share)
For example, if the market cap is about $7.4 billion and annual revenue is about $3.7 billion, the PSR is 2x. It means 'the market pays $2 for every $1 of revenue.'
The PSR is especially useful when a company isn't yet profitable. Fast-growing startups and tech companies are often in the red because they invest aggressively for the future. When profit is negative, the P/E ratio becomes meaningless, but because revenue is (almost) always positive, the PSR can gauge the price tag.
The PSR's decisive weakness
The PSR has one big trap: it reflects 'profitability' not at all.
Even with the same revenue, one company can leave solid profit while another loses money the more it sells. The PSR treats these two the same. In other words, 'a company with big revenue that never generates absolute profit' can look cheap on a PSR basis.
So the PSR must always be viewed together with 'profit margin.' Even at the same PSR, a company with a 30% operating margin and one with a −10% margin are completely different stories. If revenue is large but nothing is left over, a low PSR is meaningless.
The PSR varies enormously by industry. It's normal for high-margin software to have a high PSR, while thin-margin, high-volume retail and construction come out with low PSRs. So you must always compare within the same industry.
How to use the PSR properly
To view the PSR usefully, you need to consider three things together.
① View it with profit margin: even at the same PSR, a company with a higher operating margin is far better. The PSR can't see 'the power to turn revenue into profit,' so complement it with the margin.
② View it with revenue growth rate: growth stocks grow revenue fast, so a high PSR can be somewhat justified. When growth stops, a high PSR comes back as a burden.
③ Compare within the same industry and against the past: the absolute PSR number alone is meaningless; you must weigh it against rivals and the company's own past PSR.
In short, the PSR is a handy supplementary tool for viewing 'loss-making, early-stage growth companies where the P/E ratio doesn't work.' But because it's a metric that can't see profitability, judging by it alone is dangerous. This article is a concept explanation, not a recommendation of any specific stock.
Frequently Asked Questions
Q. Isn't a low PSR a sign of being undervalued?
You can't simply see it that way. A company with a low PSR may be in an inherently low-margin industry, or it may have revenue but not make money. The PSR is a metric that can't see profit, so it must always be viewed together with profit margin and growth, and it only becomes meaningful when compared within the same industry.
Q. Is the PSR used only for growth stocks?
It's mainly used that way, but not exclusively. It's also used to compare cyclical companies whose profits swing sharply and temporarily, or companies that have turned to a loss, by using relatively stable revenue instead of profit. Still, it's ultimately a supplementary metric.
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