Price-to-Book (P/B) — price-to-book value ratio
What is the Price-to-Book ratio, how to calculate it and when to use P/B for valuing publicly traded companies.
Definition
Price-to-Book (P/B) is a ratio comparing the market price of a stock with its book value. It shows how much the market "pays extra" above the company's net asset value.
Formula
P/B = Stock Price / Book Value per Share
or:
P/B = Market Capitalization / Shareholders' Equity
Example: A stock costs 50 PLN, book value per share is 25 PLN.
P/B = 50 / 25 = 2.0
The market values the company at twice its book value.
Interpretation
| P/B | What it means |
|---|---|
| < 1.0 | Stock below book value — potentially undervalued or in trouble |
| 1.0–2.0 | Fair valuation for "value" companies |
| 2.0–5.0 | Typical for good companies with competitive advantage |
| > 5.0 | High — market believes in future growth (or it's a bubble) |
P/B < 1 — opportunity or trap?
A company valued below book value may be an opportunity, but more often means:
- Company is losing money and assets are losing value
- Industry in decline
- Management or debt problems
Check why P/B is low before buying.
When is P/B useful?
P/B works best in sectors with large tangible asset bases:
- Banks — P/B is a fundamental valuation metric (PKO BP: P/B ~1.2)
- Insurance companies — investment portfolios are real assets
- REITs / real estate — P/B compares to property value
- Industry — factories, machinery, inventory
When P/B fails?
- Tech companies — value lies in software, patents and people, not tangible assets. Microsoft with P/B > 10 isn't "expensive" in the traditional sense
- Service companies — few physical assets
P/B and emerging markets
Emerging markets often have lower P/B ratios than developed markets. Average P/B for MSCI EM is ~1.5–1.8, while S&P 500 is ~4.0+. This is one reason why value investors look for opportunities in EM.
How Freenance can help
Freenance displays P/B ratios for companies in your portfolio and lets you compare valuations against sector peers. You can quickly see which positions are relatively cheap and which are expensive.
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