Warren Buffett's 9 Investment Criteria — Complete Guide

📅 2026-05-06 · 8 min read · StockInto Guide

Warren Buffett has compounded capital at roughly 20% annually for 60 years through Berkshire Hathaway. The secret isn't a clever technique — it's the consistent application of simple, time-tested rules. This article distills the 9 quantitative criteria Buffett actually uses, the same ones StockInto applies to every stock automatically.

What's covered
Each criterion's ① meaning ② threshold ③ pass/fail examples ④ how StockInto scores it. With links to try the analysis live at the end.

📋 Table of Contents

Why Buffett's criteria?
The original 5 (profitability + stability)
The improved 4 (consistency + moats)
StockInto's grading scale (A~F)
Try it on real stocks

Why Buffett's criteria?

Buffett, a student of Benjamin Graham, evolved beyond pure "buy cheap" value investing to a philosophy of "buy great businesses at fair prices". He has refined the quantitative tests of "great" for 60 years, focusing on three axes:

Profitability — Does the company earn high returns on invested capital? (ROE 15%+)
Stability — Is it leveraged dangerously? Does cash actually flow? (Debt ratio, positive FCF)
Persistence — Single-year luck, or multi-year consistency? (5-10 year ROE trend, margin stability)

Plus a final filter: "Am I overpaying right now?" (margin of safety 30%+). Together, 9 quantitative criteria.

The Original 5 — Profitability + Stability

ROE (Return on Equity)

≥ 15% (sector-adjusted)

For every $100 of shareholder capital, how much profit per year? Buffett's single favorite metric. His most cherished holdings — Coca-Cola, See's Candies — all sustained ROE above 20% consistently.

Examples: Apple ROE ~150% (buyback effect) · Microsoft ~35% · Samsung Electronics ~10-15%. Note: ROE inflated by negative equity (capital impairment) is filtered out.

Debt-to-Equity Ratio

≤ 100% (sector-adjusted)

Total debt vs. shareholder equity. Buffett: "ROE inflated by debt is fake ROE." High leverage looks great in booms, devastating in recessions. Note: financials and utilities run on debt by design, so different thresholds apply (financials up to 400%).

Examples: Apple D/E ~150% (equity reduced by buybacks) · Berkshire D/E ~25% · Samsung Electronics D/E ~5-10% (cash-rich).

Operating Margin

≥ 15% (sector-adjusted)

Profit per $100 of revenue from core operations. Direct evidence of pricing power — the quantitative form of Buffett's "moat". High margins mean competitors can't easily replicate the business.

Examples: Microsoft ~42% · Coca-Cola ~28% · Auto industry average 5-8% (low-margin sector).

Revenue Growth

> 0%

Is revenue growing year-over-year? Buffett prefers steady growth over explosive growth. Negative growth signals the business itself is shrinking.

A company at PER 5 with -10% revenue growth may look cheap, but it could be a "value trap".

Positive Free Cash Flow (FCF)

> 0

Operating cash flow minus capital expenditures. The real cash left over. Buffett's starting point for every valuation. Accounting earnings can be manipulated; FCF cannot lie. Negative FCF means the business depends on outside capital, not its own operations.

Pre-profitability growth stocks (early Tesla) often have negative FCF — that's normal. But for mature companies, negative FCF is a red flag.

The Improved 4 — Consistency + Moats

The first 5 are single-year snapshots. Buffett's real edge is asking "is it consistent over 10 years?" StockInto's added 4 criteria quantify this multi-year persistence.

ROE Consistency (multi-year 15%+)

3+ of 5 years passed

Is the 15%+ ROE a one-year fluke, or has it persisted for at least 3 out of 5 years? This separates structural strength from cyclical luck. Buffett's "holding period = forever" depends on this.

Coca-Cola has maintained ROE 25%+ nearly every year since the 1980s. This is fundamentally different from a one-year IPO breakout that fades.

Gross Margin Stability

5-year std dev ≤ 5pp

Does GM stay relatively flat year to year? Stable GM = stable pricing power. Companies subject to commodity prices (oil refiners, steel) see GM swing widely.

Microsoft GM stays 65-70% every year · Airlines see GM swing from 10% to 25% with fuel prices (the pattern to avoid).

R&D Investment (% of revenue)

Tech 5%+, Healthcare 8%+

Investing in the future? Tech and healthcare lose competitiveness the moment R&D stops. Financials/utilities have no R&D concept by nature, so they auto-pass.

Examples: Alphabet R&D ~14% · Pfizer ~16% · Coca-Cola ~0% (consumer staple, irrelevant).

Margin of Safety

Current price 30%+ below fair value

Is StockInto's calculated fair value (DCF + PER + Graham weighted) at least 30% above the current price? Graham's core concept that Buffett inherited. "Buy a $100 asset for $70." This margin absorbs error in your assumptions.

Fair value $200, buy at $130 → margin of safety 35% (pass). Fair value $200, buy at $200 → margin 0% (fail).

StockInto's Grading Scale

Among the 9 criteria, those without sufficient data (N/A) are excluded from the denominator. Pass rate determines the grade.

A+ — 90%+ passed (e.g., 9/9 or 8/8)
A — 80%+ passed
B — 70%+ passed
C — 50%+ passed (partial fit)
D — 30%+ passed (most criteria failed)
F — under 30% (mostly failed)

Note: Grades reflect quantitative pass rates, not buy/sell recommendations. Business model, management quality, and industry cycle aren't captured in numbers — use the grade as a screening tool, not a verdict.

🎯 Try it on real stocks

Apply Buffett's criteria instantly. Results in 1 second.

Analyze Apple → Analyze Berkshire → Analyze Coca-Cola →

Or search any other ticker on the homepage.

🔗 Related guides

← Back to home