Benjamin Graham's Principles


Benjamin Graham's framework, first published in Security Analysis (1934) and later refined in The Intelligent Investor (1949), remains the foundation of systematic value investing. The methodology described below is not a set of predictions or market timing rules. It is a checklist-based approach to evaluating individual securities based on publicly available financial statements.

The principles fall into four categories:

  • Intrinsic Value: A conservative estimate of what a company is worth, derived from its assets, earnings power, and dividend history. Market prices are ignored.
  • Margin of Safety: A purchase is justified only when the market price is substantially below intrinsic value — ideally by 33–50% or more.
  • Mr. Market: Daily price fluctuations are treated as noise, not signals. The investor acts only when prices become attractive.
  • Investment vs. Speculation: Quantitative factors take priority over qualitative narratives.


Defensive vs. Enterprising Investor

Graham distinguishes between two levels of engagement. The Defensive Investor requires a simple, low-effort portfolio based on strict quantitative filters: minimum company size, current ratio above 2.0, long-term debt below working capital, ten consecutive years of positive earnings, twenty years of uninterrupted dividend payments, cumulative earnings growth of at least 33% over ten years, and valuation limits of P/E ≤ 15 or P/B ≤ 1.5 (or a combined product ≤ 22.5).

The Enterprising Investor may accept looser thresholds and conduct deeper analysis, including management quality and special situations. The most rigorous category, Net-Net (NCAV) investing, requires price below two-thirds of net current asset value per share.

All valuations are cross-checked using the Graham Number, the Graham Formula (both original and bond‑yield‑adjusted versions), and asset‑based approaches. The lowest reasonable estimate becomes the benchmark for calculating the Margin of Safety.

Modern Context

The Federal Reserve's influence on interest rates, liquidity, and asset valuations was minimal during Graham's lifetime. Today, monetary policy affects discount rates, corporate borrowing costs, and general market conditions. While this external environment does not alter a company's intrinsic value, it may influence the Margin of Safety an investor requires. For users interested in current Fed policy, interest rate trends, and balance sheet developments, separate supporting tools are available under Monetary Policy Support and MS Index. These are offered as contextual supplements, not as modifications to Graham's fundamental framework.

Disclaimer: This website is for educational and informational purposes only. Nothing on this site constitutes financial, investment, legal, or tax advice. All calculations, screeners, and commentary are based on publicly available data and historical formulas. Past performance does not guarantee future results. Always conduct your own research and consult with qualified professionals before making investment decisions. The authors and operators of this site are not registered investment advisors.