P/B = market price per share / book value per share

• Book Value per Share = Common Equity / Common Shares Outstanding
• Common Equity = Total Equity - Preferred Equity

Positives of P/B

• Book value is usually positive.
• Many financial services companies trade close to their book values.
• Book value is less volatile than earnings.
• Stock return trends can be analyzed within the context of differences in P/B values.

Limitations of P/B

• Industry differences and asset size differences can create comparability challenges for the P/B ratio metric.
• Differing accounting practices can create comparability challenges for the P/B ratio metric.
• P/B is often driven by historical asset values (less depreciation), which may not reflect market value.
• Book value does not always capture all factors that drive a company's value, such as a unique workforce skill set.

P/B Value for a Constant Growth Company

P0/BV0 = (ROE1 - g) / (rce - g)

For justified P/B ratios:

• As ROE increases, the P/B ratio increases
• As rce increases, the P/B ratio decreases

Adjusting Book Value

Common adjustments to book value include:

• Intangible Assets: When a company overpays for an acquisition, then book value should be reduced by the amount of goodwill recognized.

• Assets and Liabilities: Book value should be adjusted for assets at historical value (moving them to market value); off balance sheet financing vehicles may also require adjustments to book value.

• Different Accounting Practices: When comparing companies with different accounting practices, adjustments will need to be made so their P/B ratios are really comparable.