Glossary · Investing Basics
Price-to-Book Ratio
A valuation metric comparing a stock's market price to its book value per share. A P/B below 1 can indicate undervaluation, though context and sector norms matter significantly.
01—What is Price-to-Book Ratio?
The definition — and what it means in practice.
Price-to-Book Ratio (P/B) is a valuation metric that compares a company’s market price per share with its book value per share (the accounting net assets attributable to ordinary shareholders, per share). It is calculated by dividing the share price by book value per share. A P/B below 1 can suggest the market values the company at less than its recorded net assets, but the meaning depends heavily on asset quality and the sector.
P/B matters because it helps you judge whether a stock looks expensive or cheap relative to what the balance sheet says the company owns (after liabilities). It is often used alongside profitability measures, because a low P/B can reflect weak returns, poor asset quality, or genuine pessimism rather than a bargain. Comparing P/B within the same industry, and checking trends over time, usually gives a clearer picture than a single number.
If a PSX share is Rs 120 and its book value per share is Rs 100, its P/B is 1.2 (price is 20% above book value).
P/B Ratio = Market Price per Share ÷ Book Value per Share
Book value per share typically comes from shareholders’ equity ÷ number of ordinary shares (from audited accounts).
- P/B compares market price with book value per share (net assets per share).
- A P/B below 1 can indicate undervaluation, but sector norms and asset quality are crucial.
- Best used for comparisons within the same sector and against a company’s own history.
- Combine with profitability metrics to avoid mistaking weak businesses for “cheap” stocks.
02—How price-to-book ratio works on the PSX
The Pakistan-specific rules, conventions, and numbers.
On the Pakistan Stock Exchange (PSX), investors commonly use P/B when scanning stocks by valuation and when comparing companies in the same sector. The “price” side comes from the current market price visible during PSX trading, while the “book” side comes from the company’s balance sheet in its audited annual accounts, which listed companies are required to publish under the Companies Act 2017.
In practice, PSX investors may notice that P/B can move quickly with market prices, while book value usually changes more gradually as new financial statements are released. That timing difference means P/B can look unusually high or low between reporting dates. Using P/B as a starting point, and then checking the underlying balance sheet line items and other valuation measures, helps interpret what the ratio is really signalling.
03—Common misconceptions
Where investors most often get this wrong.
A P/B below 1 always means the stock is a bargain.
Not necessarily. It may reflect poor profitability, doubtful asset values, high risk, or market concerns. Context and peer comparison matter.
P/B works the same way for every sector.
Sector norms differ widely. Asset-heavy businesses can have more meaningful book values than asset-light businesses where book value may understate economic value.
Book value is the cash the company has available.
Book value is accounting equity (assets minus liabilities), not cash. Many assets are non-cash and may not be easily realised at balance-sheet values.
04—Using price-to-book ratio on BSL
Where this term shows up across the platform — with live data.
- Compare valuation across names using the Stock Screener.
- Check sector peers and their trading behaviour from the Sectors view.
- Read company filings and scheduled disclosures via Board Meetings.
- Learn related terms in the Glossary.
05—Frequently asked questions
What investors ask about price-to-book ratio on the PSX.
Frequently Asked Questions
Divide the market price per share by book value per share. Book value per share is typically shareholders’ equity divided by the number of ordinary shares, taken from audited annual accounts.
It means the market price is below the company’s book value per share. That can indicate undervaluation, but it can also signal concerns about profitability, asset quality, or business risk, so sector comparison is important.
It is most informative for companies where balance-sheet assets are a major part of the business. For asset-light companies, book value may not reflect the company’s economic value well, so P/B can be less useful.
Book value per share is derived from the balance sheet in the company’s audited financial statements. Listed companies publish audited annual accounts and hold Annual General Meetings under the Companies Act 2017.
Yes. P/B changes with the share price during trading. Book value per share usually updates when new financial statements are issued, so the ratio can shift mainly due to price movements between reporting dates.
06—Related terms
Keep building the picture.
The net asset value of a company is calculated by subtracting total liabilities from total assets. Book value per share is a common metric used to assess whether a stock is undervalued or overvalued.
A financial statement showing a company's assets, liabilities, and shareholders' equity at a specific point in time. It is one of the three core financial statements used in fundamental analysis.
The process of determining the current worth of a security or company. Common valuation methods include discounted cash flow analysis, P/E ratio comparison, and price-to-book analysis.
One of the most widely used valuation metrics. Calculated by dividing the current share price by earnings per share. A high P/E may suggest the market expects strong future growth; a low P/E may indicate undervaluation or declining prospects.
A profitability ratio measuring how effectively a company generates profit from shareholders' equity. Calculated by dividing net income by average shareholders' equity.
Put the term to work
Open a free BSL trading account
Understand the market, then trade it — live PSX data, screening tools, and a research desk that speaks plain English.