Low PEG Ratio US Stocks — Growth at a Reasonable Price with PEG Below 1 on NYSE & NASDAQ
PEG ratio below 1 means you're paying less per unit of earnings growth than the growth rate justifies — Peter Lynch's definition of the ideal GARP stock.
About This Screen
The PEG ratio — Price/Earnings to Growth — was popularized by Peter Lynch as a simple way to compare the valuation of growth stocks against their actual growth rates. The core insight: a P/E of 20 is cheap if the company is growing earnings at 30% per year, but expensive if earnings are growing at 5%. PEG below 1 means you're paying less in P/E terms than the earnings growth rate justifies — by Lynch's definition, these are undervalued growth stocks.
WHAT THIS SCREEN FINDS: US NYSE and NASDAQ stocks with PEG ratio below 1, market cap above $1B, D/E below 1, and earnings growth above a minimum threshold. PEG is calculated as (P/E) / Earnings Growth Rate. Both inputs must be positive — loss-making companies and declining-earnings businesses are excluded.
KEY METRICS EXPLAINED: A PEG of 0.7 means you're paying a P/E of 14 for a company growing earnings at 20% — the growth rate is higher than what the P/E implies you're paying. A PEG below 1 is the zone Lynch called 'undervalued.' A PEG of 1 is fair value in Lynch's framework. A PEG above 2 suggests the growth is already fully priced or the stock is expensive relative to its growth prospects.
WHY INVESTORS USE IT: Pure P/E comparisons unfairly penalize fast-growing companies. A biotech at P/E 30 growing earnings at 40% is far cheaper than a utility at P/E 15 growing at 3%. PEG normalizes the comparison and identifies where growth is genuinely undervalued relative to the price paid for that growth. Peter Lynch credited PEG as a core tool in building his legendary Magellan Fund returns.
BENEFITS: Accounts for growth rate in valuation — avoids cheap-junk trap. Identifies genuine growth value where market underestimates momentum. Lynch-validated methodology with decades of practitioner use. D/E filter prevents buying leveraged growth that looks cheap on PEG but carries hidden risk.
RISKS AND LIMITATIONS: PEG is only as reliable as the earnings growth rate used. Historical growth rates may not continue. Using TTM earnings growth rather than forward estimates introduces historical bias. High PEG can still be justified if growth accelerates. Very high growth rates (above 30%) produce very low PEGs that may reflect one-time items rather than sustainable earnings momentum.
HOW TO ANALYZE STOCKS FROM THIS SCREEN: Verify earnings growth is sustainable over 3+ years, not a one-year spike. Check whether growth is organic (revenue-driven) or accounting-driven (margin expansion, tax changes). Compare the PEG to the industry average PEG for context. Confirm the D/E level is comfortable even in a downturn scenario where growth might slow.
COMMON MISTAKES: Using single-year earnings growth to calculate PEG — use 3-year CAGR for more reliable results. Ignoring the source of earnings growth. Buying extremely low-PEG stocks without checking why the market has priced them so cheaply. Confusing PEG below 1 as a guaranteed buy signal — it's a screening starting point, not a complete investment thesis.
Related screens: GARP Stocks (broader growth-at-reasonable-price methodology), Peter Lynch Fast Growers (Lynch's full 15-30% growth framework), Low PE High EPS Growth (similar angle combining P/E with EPS momentum), EPS Forward Acceleration (forward earnings growth signal).
Frequently Asked Questions
What is the PEG ratio?
PEG (Price/Earnings to Growth) = P/E Ratio / Earnings Growth Rate. It adjusts the P/E multiple for the company's growth rate, allowing fairer comparison between fast-growing and slow-growing companies. A PEG below 1 means you're paying a P/E lower than the earnings growth rate — Peter Lynch's definition of an undervalued growth stock.
What does a PEG ratio below 1 mean?
A PEG below 1 means the P/E ratio is lower than the earnings growth rate. For example, PEG of 0.8 on a company with P/E 16 and earnings growth of 20%. Peter Lynch argued that a PEG below 1 indicates the stock is undervalued relative to its growth — you're paying less for the growth than it's worth.
Is PEG below 1 always a buy signal?
No. PEG below 1 is a starting filter, not a guarantee. The earnings growth rate used can be unreliable (one-time items, accounting changes), the growth may not continue, and the business may have other risks not captured by PEG. Use it to identify candidates for deeper research, not as a standalone buy signal.
What earnings growth rate is used to calculate PEG on StockSifting?
StockSifting calculates PEG using the most recent available earnings growth rate from annual financial data. For more reliable screening, look for companies where earnings growth has been consistently above the P/E ratio for multiple years — not just the most recent year's calculation.
How does PEG compare to P/E as a valuation tool?
P/E is an absolute measure — P/E of 20 tells you the price-to-earnings ratio but nothing about growth. PEG normalizes P/E by growth rate, enabling comparison between companies growing at different rates. A P/E of 30 with 35% growth (PEG 0.86) is cheaper on a PEG basis than P/E of 15 with 10% growth (PEG 1.5).
What PEG ratio did Peter Lynch use?
Lynch used PEG as a central tool in his GARP (Growth at Reasonable Price) framework at Fidelity Magellan. He looked for PEG below 1 as undervalued, PEG of 1 as fair value, and PEG above 2 as expensive. His book One Up on Wall Street discusses PEG extensively as a way to identify fast growers that the market hasn't fully priced.
What are the limitations of the PEG ratio?
PEG is backward-looking when using historical growth rates. Very high growth rates (above 30-40%) produce artificially low PEGs that may not be sustainable. PEG doesn't account for debt, margins, or cash flows. It's also less useful for mature, stable businesses where the growth rate component is very low or zero.
Which sectors typically show low PEG ratios?
Technology, healthcare, and consumer discretionary — sectors with meaningful earnings growth but sometimes moderate P/E multiples due to investor uncertainty about growth sustainability. During sector sell-offs, previously high-PEG companies can temporarily fall below PEG of 1 as P/E compresses faster than earnings estimates fall.
Should I use PEG with historical or forward earnings growth?
Both have merits. Historical PEG (using TTM earnings growth) reflects what has actually happened. Forward PEG (using analyst consensus EPS estimates) reflects expectations. Historical is more factual; forward is more relevant for investment decisions but depends on analyst accuracy. This screen uses historical growth for objectivity.
How does the Low PEG screen differ from the GARP screen?
The Low PEG screen uses a specific PEG < 1 threshold as its primary filter. The GARP (Growth at Reasonable Price) screen typically applies multiple simultaneous criteria including minimum growth rates, maximum P/E, minimum ROE, and balance sheet requirements. GARP is a broader framework; Low PEG is a more focused single-metric filter for the same general concept.
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