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.
A P/B of 3 means investors are paying three times the accounting net worth, implying they expect returns on those assets well above their book cost. A P/B below 1 means the market values the company at less than its stated net worth, which can signal either a genuine bargain or a business the market believes is worth less than its books claim.
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.
In India, banking is the most common context for P/B analysis, because a bank's main assets are its loans, carried on the balance sheet at value less provisions. Well-run private banks like HDFC Bank or Kotak have historically traded at 3-4 times book, reflecting high return on equity, while public sector banks with weaker asset quality have traded at 0.5-1.0 times book, reflecting the market's doubt about the true realisable value of their loan books.
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.
P/B is most powerful when read together with return on equity. High ROE at a reasonable P/B is attractive; low ROE at a low P/B is often a value trap, cheap for a good reason. For asset-light businesses like IT or consulting, P/B is largely uninformative because the assets that drive earnings, brand and intellectual capital, never appear on the balance sheet, so P/E or EV/EBITDA are more appropriate tools there.
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