P/E Ratio
P/E = Price / Earnings per Share. The foundation of equity valuation. It says: how many years of annual profit am I paying for one share. Historical average of the S&P 500: ~16. But sectors vary widely — banks below 12, tech above 25.
Forward vs. Trailing P/E
Trailing P/E (TTM, Trailing Twelve Months) uses the profit of the last 12 months. Forward P/E uses the analyst-estimated profit for the next 12 months. For growth companies the forward P/E is lower than the trailing P/E — because earnings are growing. For cyclicals this can be misleading: forward estimates are too optimistic in booms, too pessimistic in recessions.
P/B Ratio
P/B = Price / Book Value per Share. Useful for banks and capital-intensive industries — here book value is closer to "fair value" than for a software company. P/B < 1 at a bank can mean: the market doubts the asset value (bad loans). For a software company P/B of 10+ is normal because value sits in code and customers, not physical assets.
PEG
PEG = P/E / Expected Earnings Growth (in %). The Peter Lynch metric from "One Up On Wall Street". Rough rule of thumb:
- PEG < 1 → potentially undervalued
- PEG 1–2 → fair
- PEG > 2 → expensive
Only meaningful for genuine growth companies. For stagnating or cyclical companies the growth assumptions are so fragile that the metric creates an illusion of precision.
EV/EBITDA
Enterprise Value = Market cap + Net debt − Cash. EV/EBITDA is capital-structure-independent — that is why it is the standard for M&A comparisons and cross-industry benchmarks. Two companies with identical EBITDA but different leverage have the same EV/EBITDA, even though their P/E ratios would differ wildly.
FCF Yield
FCF Yield = FCF / Market cap. The inverse of Price-to-FCF. Benchmark > 5 % as healthy for established companies. At an FCF yield of 8 % you receive as a shareholder 8 cents of cash per invested dollar each year — the company can use this for dividends, buybacks, or debt reduction.
Price/Sales (P/S)
Only a fallback when no profits exist. For unprofitable growth companies (SaaS start-ups, biotechs) it is the only valuation bridge. Tesla 2020: P/S above 15 — historically extreme. Zoom Video 2021: P/S peak ~90. Both collapsed later. Without a profitability comparison P/S is blind.
Sector Benchmarks
| Sector | Normal P/E | EV/EBITDA | P/B | FCF Yield |
|---|---|---|---|---|
| Banks | 8–12 | n/a | 0.8–1.5 | n/a |
| Utilities | 15–20 | 8–12 | 1.5–2.5 | 3–5 % |
| Consumer Staples | 18–25 | 12–18 | 3–6 | 4–6 % |
| Industrials | 15–22 | 10–15 | 2–4 | 4–7 % |
| Tech (ex-Hyperscale) | 20–35 | 15–25 | 4–12 | 3–5 % |
| Hyperscale Tech | 25–40 | 20–30 | 6–20 | 2–4 % |
| Biotech / Pharma | 15–25 | 10–18 | 3–6 | 4–6 % |
Pitfalls
- ❌ P/E misleading for cyclicals: In a boom profits are high, P/E optically low → looks cheap. In a recession profits collapse, P/E optically high → looks expensive. Exactly the reverse of reality. For automotive, steel, chemical, and semiconductor stocks, prefer the Shiller P/E (CAPE, 10-year average) or EV/EBITDA on a multi-year average.
- ❌ P/B misleading when goodwill makes up a very large share of equity — the "hard" book value (Tangible Book Value = equity − goodwill − intangibles) can be significantly lower or even negative.
- ❌ P/S without profitability is flying blind. Two companies at P/S 10 can be completely different — one growing at 40 % on its way to a 25 % margin, the other stagnating at a 3 % margin.
- ❌ EV/EBITDA ignores CapEx. A company with high CapEx needs (steel, telecoms) looks cheaper on EV/EBITDA than it really is. Better: EV/EBIT or EV/FCF.
- Finviz — comprehensive (stock screener with ~80 criteria), free in the basic version
- Simply Wall St — visually well presented, but paid for deep analysis
- Broker-built screeners (comdirect, IBKR, Scalable)
Workflow: Find candidates with an external screener → tag them as strategies in sTraderZ.com → trace trades back. See Chapter: Strategies & Signals.