Every time a company sells a customer something, it is generating revenues. Revenues are the sales generated by a company for peddling goods or services. Whether or not a company has made money in the last year, there are always revenues. Even companies that may be temporarily losing money, have earnings depressed due to short-term circumstances (like product development or higher taxes), or are relatively new in a high-growth industry are often valued off of their revenues and not their earnings. Revenue-based valuations are achieved using the price/sales ratio, often simply abbreviated PSR.

The price/sales ratio takes the current market capitalization of a company and divides it by the last 12 months trailing revenues. The market capitalization is the current market value of a company, arrived at by multiplying the current share price times the shares outstanding. This is the current price at which the market is valuing the company. For instance, if our example company XYZ Corp. has ten million shares outstanding, priced at $10 a share, then the market capitalization is $100 million.

Some investors are even more conservative and add the current long-term debt of the company to the total current market value of its stock to get the market capitalization. The logic here is that if you were to acquire the company, you would acquire its debt as well, effectively paying that much more. This avoids comparing PSRs between two companies where one has taken out enormous debt that it has used to boast sales and one that has lower sales but has not added any nasty debt either.

Market Capitalization = (Shares Outstanding * Current Share Price) + Current Long-term Debt
The next step in calculating the PSR is to add up the revenues from the last four quarters and divide this number into the market capitalization. Say XYZ Corp. had $200 million in sales over the last four quarters and currently has no long-term debt. The PSR would be:

 (10,000,000 shares * $10/share) + $0 debt
PSR = -----------------------------------------  = 0.5
   $200 million revenues

Uses of the PSR
As with the PEG and the YPEG, the lower the PSR, the better. Ken Fisher, who is most famous for using the PSR to value stocks, looks for companies with PSRs below 1.0 in order to find value stocks that the market might currently be overlooking. This is the most common application of the PSR and is actually a pretty good indicator of value, according to the work that James O'Shaughnessey has done with S&P's CompuStat database.

The PSR is also a valuable tool to use when a company has not made money in the last year. Unless the corporation is going out of business, the PSR can tell you whether or not the concern's sales are being valued at a discount to its peers. If XYZ Corp. lost money in the past year, but has a PSR of 0.50 when many companies in the same industry have PSRs of 2.0 or higher, you can assume that, if it can turn itself around and start making money again, it will have a substantial upside as it increases that PSR to be more in line with its peers. There are some years during recessions, for example, when none of the auto companies make money. Does this mean they are all worthless and there is no way to compare them? Nope, not at all. You just need to use the PSR instead of the P/E to measure how much you are paying for a dollar of sales instead of a dollar of earnings.

Another common use of the PSR is to compare companies in the same line of business with each other, using the PSR in conjunction with the P/E in order to confirm value. If a company has a low P/E but a high PSR, it can warn an investor that there are potentially some one-time gains in the last four quarters that are pumping up earnings per share. Finally, new companies in hot industries are often priced based on multiples of revenues and not multiples of earnings.

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