Investor Corner/The asset classes/Equity Concepts
2.1.10 Price-to-Book (P/B) Ratio
The price-to-book ratio compares a company's share price to its book value per share, the accounting value of its assets minus liabilities. It is most useful for valuing companies whose worth sits mainly in tangible assets.
Price against accounting value
Book value is what would theoretically remain for shareholders if a company sold every asset at its stated accounting value and paid off every liability. Dividing the share price by book value per share gives P/B. A P/B of 1 means the market is valuing the company at exactly its accounting net worth; above 1 means the market sees value beyond the balance sheet, such as brand strength or growth prospects.
Where it works best
P/B is most informative for asset-heavy businesses such as banks, financial institutions and manufacturers, where book value reasonably reflects the underlying assets. It is far less useful for asset-light, knowledge-driven businesses such as software or consulting firms, where most of the real value lies in intangibles like brand, talent and intellectual property that rarely show up fully on a balance sheet.
Reading a low P/B carefully
A low P/B can indicate a genuinely undervalued company, but it can equally indicate a company whose assets are overstated, declining, or facing a real threat to future earnings. As with P/E, the ratio is a starting filter that raises the right questions, not a conclusion, and it works best alongside other measures rather than in isolation.
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