The price-to-book (P/B) ratio is widely favored by value investors for identifying low-priced stocks with exceptional returns. The ratio is used to compare a stock’s market value/price to its book value.
The P/B ratio is calculated as below:
P/B ratio = market price per share/book value of equity per share
P/B ratio reflects how many times book value investors are ready to pay for a share. So if the share price is $10 and book value of equity is $5, investors are ready to pay two times the book value. Ideally, a P/B value under 1.0 is considered good, indicating a potentially undervalued stock. However, value investors often consider stocks with a P/B value under 3.0.
Now let us understand the concept of book value.
What is Book Value?
There are several ways by which book value can be defined. Book value is the total value that would be left over, according to the company’s balance sheet, if it goes bankrupt immediately. In other words, this is what shareholders would theoretically receive if a company liquidates all its assets after paying off its liabilities.
It is calculated by subtracting total liabilities from the total assets of a company. In most cases, this equates to the common stockholders’ equity on the balance sheet. However, depending on the company’s balance sheet, intangible assets should also be subtracted from the total assets to determine the book value.
Understanding P/B Ratio
By comparing the book value of equity to its market price, we get an idea of whether a company is under- or overpriced. However, like P/E or P/S ratio, it is always better to compare P/B ratios within industries.
A P/B ratio less than one means that the stock is trading at less than its book value, or the stock is undervalued and therefore a good buy. Conversely, a stock with a ratio greater than one can be interpreted as being overvalued or relatively expensive.
But there is a caveat. A P/B ratio less than one can also mean that the company is earning weak or even negative returns on its assets, or that the assets are overstated, in which case the stock should be shunned because it may be destroying shareholder value. Conversely, the stock’s share price may be significantly high – thereby pushing the P/B ratio to more than one – in the likely case that it has become a takeover target, a good enough reason to own the stock.
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