The price-to-book value ratio is also helpful to investors valuating a company. It compares a stock's per-share price (market value) to its book value (shareholders' equity). The price-to-book value ratio, expressed as a multiple (i.e. how many times a company's stock is trading per share compared to the company's book value per share), is an indication of how much shareholders are paying for the net assets of a company.
The book value of a company is the value of a company's assets expressed on the balance sheet. It is the difference between the balance sheet assets and balance sheet liabilities and is an estimation of the value if it were to be liquidated.
The price/book value ratio, often expressed simply as "price-to-book", provides investors a way to compare the market value, or what they are paying for each share, to a conservative measure of the value of the firm.
The dollar amount in the numerator, $67.44, is the closing stock price for the fictitious Zinzibar Holdings as of December 30, 2017, as reported in the financial press or over the Internet in online quotes. In the denominator, the book value per share is calculated by dividing the reported shareholders' equity (balance sheet) by the number of common shares outstanding (balance sheet) to obtain the $18.90 book value per-share figure. By simply dividing, the equation gives us the price/book value ratio indicating that, as of Zinzibar Holdings' 2017 fiscal yearend, its stock was trading at 3.6-times the company's book value of $18.90 per share.
A conservative alternative to using a company's reported shareholders' equity (book value) figure would be to deduct a company's intangible assets from its reported shareholders' equity to arrive at a tangible shareholders' equity (tangible book value) amount. For example, Zinzibar Holdings' FY 2017 balance sheet reports goodwill (in millions $) of $2,428.8 and net intangible assets of $756.6, which total $3,185.4. If we deduct these intangible assets from its shareholders' equity of $4,682.8 of the same date, Zinzibar Holdings is left with a significantly reduced tangible shareholders' equity of $1,497.4. Factoring this amount into our equation, the company has a book value per share of only $6.04, and the price/book value ratio then skyrockets to 11.2 times.
If a company's stock price (market value) is lower than its book value, it can indicate one of two possibilities. The first scenario is that the stock is being unfairly or incorrectly undervalued by investors because of some transitory circumstance and represents an attractive buying opportunity at a bargain price. That's the way value investors think. It is assumed that the company's positive fundamentals are still in place and will eventually lift it to a much higher price level.
On the other hand, if the market's low opinion and valuation of the company are correct (the way growth investors think), at least over the foreseeable future, as a stock investment, it will be perceived at its worst as a losing proposition and at its best as being a stagnant investment.
Some analysts feel that because a company's assets are recorded at historical cost that its book value is of limited use. Outside the United States, some countries' accounting standards allow for the revaluation of the property, plant and equipment components of fixed assets in accordance with prescribed adjustments for inflation. Depending on the age of these assets and their physical location, the difference between current market value and book value can be substantial, and most likely favor the former with a much higher value than the latter.
Also, intellectual property, particularly as we progress at a fast pace into the so-called "information age", is difficult to assess in terms of value. Book value may well grossly undervalue these kinds of assets, both tangible and intangible.
The P/B ratio therefore has its shortcomings but is still widely used as a valuation metric. It is probably more relevant for use by investors looking at capital-intensive or finance-related businesses, such as banks.
Read more: Investment Valuation Ratios: Price/Book Value Ratio