The price-to-book ratio compares a company market capitalization to its book value (assets minus liabilities), showing how much investors pay for each dollar of net assets on the balance sheet.
Company X has total assets of $500 million, total liabilities of $200 million, and 50 million shares outstanding. Book value = $500M − $200M = $300M. Book value per share = $300M ÷ 50M = $6.00. If the stock trades at $24, P/B = $24 ÷ $6 = 4.0x. Investors pay $4 for every $1 of net assets. A competitor in the same industry trades at P/B = 1.5x, suggesting Company X is either overvalued or has superior growth prospects, brand value, or intangible assets.
P/B is most useful for asset-heavy businesses like banks, insurance companies, and manufacturing firms where book value closely represents the economic value of the business. For banks, P/B below 1.0 can signal that the market believes the bank's assets are overstated (potential loan losses). For tech companies, P/B is less meaningful because most value comes from intangible assets (software, patents, brand) not captured on the balance sheet.
Value investors have historically used P/B as a primary screening tool. Academic research (Fama-French) shows that low P/B stocks (value stocks) have outperformed high P/B stocks (growth stocks) by 3-5% annually over long periods across most global markets. This "value premium" is one of the most documented anomalies in finance. However, from 2010-2020, growth stocks dramatically outperformed value, leading some to question whether the value premium still exists or has been arbitraged away.
P/B has significant limitations. It doesn't account for intangible assets like brand value (Coca-Cola's brand is worth $80+ billion but isn't on the balance sheet), intellectual property (pharmaceutical patents), or human capital (Google's engineers). Companies with heavy share buybacks may show artificially high P/B because buybacks reduce book value. Always use P/B alongside ROE (return on equity) — a low P/B only signals value if ROE is decent. P/B < 1 with declining ROE is a value trap, not a bargain.
JPMorgan Chase (JPM) typically trades at P/B of 1.5-2.0x, reflecting its strong franchise and consistent 15% ROE. During the March 2020 crash, JPM's P/B briefly dropped below 1.2x — a level not seen since the 2008 crisis. Investors who bought at that P/B earned 40%+ returns over the next year as the bank proved its resilience. In contrast, troubled banks often trade below book value (P/B < 1.0) for years — Citigroup traded at P/B 0.5-0.7x for most of the 2010s, reflecting ongoing concerns about its ability to generate adequate returns on its assets.
Combine P/B with ROE for powerful screening: The formula P/B = ROE × (PE ratio) means that P/B should reflect return on equity. Low P/B + High ROE = potential value opportunity. High P/B + Low ROE = overvalued.
Use tangible book value for more accuracy: Subtract goodwill and intangible assets from book value to get tangible book value. P/TBV is more conservative and useful for companies with large acquisition-related goodwill.
Compare P/B to industry peers, not the market: Banks compare P/B to other banks; utilities compare to other utilities. Cross-industry P/B comparisons are meaningless because business models create fundamentally different asset structures.
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PB ratio = Stock Price ÷ Book Value Per Share. It compares market price to the accounting value of net assets. PB below 1 means the stock trades below book value — you're buying assets at a discount. PB above 3 suggests high expectations for future growth or intangible assets not on the balance sheet.
What is a good PB ratio?
Banks: 0.5-1.5 (assets are mostly loans at fair value). Tech: 3-10+ (intangible assets like IP and brand aren't fully on the balance sheet). Manufacturing: 1-3. Value investors seek PB below 1.5; growth investors accept higher PB for companies with strong returns on equity.
PB vs. PE — which is better?
PB works best for asset-heavy businesses (banks, insurance, real estate). PE works better for profitable companies with stable earnings. For companies with negative earnings (startups, cyclical troughs), PB is more useful. Many value investors use both — low PB AND low PE identifies the cheapest stocks.