Compare Qualys, Inc. (QLYS) vs Fortinet, Inc. (FTNT) Stock

Qualys, Inc. (QLYS) offers the better valuation at 19.9x trailing P/E (12.5x forward), making it the more compelling value choice. Analysts rate Qualys, Inc. (QLYS) a "Hold" — based on 48 analyst ratings — the highest consensus in this comparison. The "better buy" depends entirely on your goals: growth investors should weight revenue trajectory, value investors should weight P/E and PEG, and income investors should weight dividend yield and streak.

On trailing P/E, Qualys, Inc. (QLYS) is the cheapest at 19.9x versus Fortinet, Inc. at 32.5x. On forward P/E, Qualys, Inc. is actually cheaper at 12.5x. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: Qualys, Inc. wins at 0.56x versus Fortinet, Inc.'s 0.80x — a PEG below 1.0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, Fortinet, Inc. (FTNT) delivered a total return of +128.1%, compared to -7.3% for Qualys, Inc. (QLYS). A $10,000 investment in FTNT five years ago would be worth approximately $23K today (assuming dividends reinvested). Over 10 years, the gap is even starker: FTNT returned +1291% versus QLYS's +270.3%. Past returns do not guarantee future results, and the stock with the higher historical return may already have its best growth priced in.

By beta (market sensitivity over 5 years), Qualys, Inc. (QLYS) is the lower-risk stock at 0.81β versus Fortinet, Inc.'s 1.23β — meaning FTNT is approximately 50% more volatile than QLYS relative to the S&P 500. On balance sheet safety, Qualys, Inc. (QLYS) carries a lower debt/equity ratio of 10% versus 81% for Fortinet, Inc. — giving it more financial flexibility in a downturn.

Qualys, Inc. (QLYS) is the more profitable company, earning 28.6% net margin versus 27.3% for Fortinet, Inc. — meaning it keeps 28.6% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: QLYS leads at 30.8% versus 30.6% for FTNT. At the gross margin level — before operating expenses — QLYS leads at 81.7%, reflecting greater pricing power or product mix advantage. Stronger margins indicate durable pricing power, lower cost of revenue, or higher mix of software/services. They are one of the clearest signs of business quality.

The PEG ratio (forward P/E divided by expected earnings growth rate) is the most precise measure of undervaluation relative to growth potential. By this metric, Qualys, Inc. (QLYS) is the more undervalued stock at a PEG of 0.56x versus Fortinet, Inc.'s 0.80x. A PEG below 1.0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, Qualys, Inc. (QLYS) trades at 12.5x forward P/E versus 26.6x for Fortinet, Inc. — 14.0x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for QLYS: 49.0% to $137.80.

None of the stocks in this comparison currently pay a material dividend. All are effectively zero-yield and should be held for capital appreciation rather than income.

For long-horizon retirement investors, Fortinet, Inc. (FTNT) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 1.23), +1291% 10Y return). Both have compounded well over 10 years (FTNT: +1291%, QLYS: +270.3%), confirming both are viable long-term holds — but the lower-volatility option typically results in less emotional selling during corrections. Retirement portfolios generally favour predictability over maximum returns. Consult a financial advisor before making allocation decisions.

Both stocks operate in the Technology sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both. These fundamental differences mean investors should not choose between them on a single metric — the "better stock" depends entirely on which of these characteristics aligns with your investment strategy.