Price-to-Book Ratio (P/B) — Market Value vs. Book Value

The Price-to-Book (P/B) ratio compares the market's valuation of a company to its accounting book value — the net asset value recorded on the balance sheet. A P/B of 2.0x means the market values the company at twice its accounting equity. A P/B below 1.0x means the market values the company below its accounting net assets.

Calculating P/B

P/B = Share Price ÷ Book Value Per Share

Book value per share = (Total Assets − Total Liabilities) ÷ Shares Outstanding

The book value represents the company's net worth as recorded under accounting standards — the value of assets minus liabilities, based on historical cost (with some adjustments). It is what shareholders would theoretically receive if the company were liquidated at book values.

When P/B Is Analytically Meaningful

P/B is most useful for industries where the balance sheet is the primary driver of value creation:

• Financial institutions: Banks, insurers, and investment firms hold large portfolios of financial assets that are marked at or near market value. The P/B ratio reflects whether the market values the financial institution's equity generation capacity relative to the equity it holds.
• Asset-heavy industrials: Companies in mining, manufacturing, real estate, and utilities derive significant value from physical assets that appear on the balance sheet. P/B provides meaningful context about whether the market is pricing those assets at a premium or discount to accounting value.

When P/B Is Not Meaningful

For asset-light businesses — technology companies, software firms, consulting businesses, platform operators — the balance sheet dramatically understates the true drivers of value. A software company's most valuable assets are its code, its customer relationships, its brand, and its employee expertise. None of these appear at their true economic value on the balance sheet under standard accounting treatment.

A technology platform with billions in market capitalization and minimal book value is not "overvalued" because its P/B ratio is high. The high P/B reflects that accounting has not captured the economic value of the platform's structural position. Applying P/B analysis to asset-light businesses systematically produces misleading conclusions.