S&P 500 Price-to-Book Ratio

Live value temporarily unavailable.

Source: Company filings (aggregated)

Data updated daily

What it measures

The S&P 500 P/B ratio (price-to-book) measures the aggregate market capitalization of the index relative to the aggregate book value of equity (shareholders' equity) of its constituents. A P/B of 4.5 means the market values the index at 4.5 times the net assets recorded on constituent balance sheets.

Why it matters

The price-to-book ratio measures whether the market is paying a premium over the accounting value of corporate net assets. Elevated P/B readings reflect the market's expectation of high future returns on equity: if ROE persistently exceeds the cost of equity, a premium to book is justified. The ratio has become less reliable as an absolute valuation tool for a modern index dominated by asset-light, intangible-heavy businesses — software, platforms, and pharma — where book value understates economic value because brands, IP, and customer relationships are not capitalized. It remains useful as a trend indicator and in conjunction with ROE: P/B divided by ROE approximates a quality-adjusted valuation multiple.

How it is calculated

P/B = Σ Market Cap ÷ Σ Book Value of Equity

LENSE computes the S&P 500 P/B as a market-capitalization-weighted aggregate — total index market cap divided by total shareholders' equity — not a simple average of per-company ratios. Book value of equity is sourced from the most recently reported quarter-end balance sheet per constituent using as-reported figures. Constituents with negative book equity are excluded from the denominator to avoid distorting the aggregate. Market capitalization is computed daily from constituent share counts and closing prices. Index constituency is resolved point-in-time using point-in-time index constituency.

Recent (monthly)

Recent data unavailable.

Data source: Company filings (aggregated). Computed and published by LENSE Analytics.