Qualys, Inc. (QLYS)

Technology · Software · Price $187.05
Updated: Aug 30, 2026
QLYS Stock Rating

Is Qualys, Inc. a Quality Business?

Analyzing business fundamentals using proven investment principles

92/100
Zyberno Score
Great Business Quality

Exceptional capital returns and consistent cash generation across all measurement periods

About Qualys, Inc.

Qualys Inc. is an American cloud-based IT security and compliance solutions company headquartered in Foster City, California. The company provides vulnerability management, policy compliance, web application scanning, endpoint detection and response, and other security solutions delivered as software-as-a-service to enterprises globally, running on one of the world's largest cloud-based security platforms.

📚 How We Measure Business Quality

The Zyberno Score answers one question: "Is this a quality business worth owning?" We analyze 16 fundamental metrics across four key dimensions, using principles from Warren Buffett, Benjamin Graham, Peter Lynch, and Charlie Munger. Each category is worth 25 points for a total of 100.
This score measures business quality only — not whether the stock is cheap, what return you'll get, or when to buy. For that, see the Valuation Trilogy below.

?/25
Profitability
Does it generate strong returns?
Buffett's Focus: High returns on equity and invested capital indicate a durable competitive advantage or "moat." Great businesses earn more with less capital.
Return on Equity (ROE) ROENet income divided by shareholder equity. Measures how efficiently a company uses investor capital to generate profits.Excellent: >20% | Good: >15% 37.2%
Return on Invested Capital ROICOperating profit divided by total invested capital. Shows how well a company allocates capital to profitable investments.Excellent: >20% | Good: >15% 51.7%
Net Profit Margin Net MarginNet income as a percentage of revenue. Higher margins indicate pricing power and operational efficiency.Excellent: >20% | Good: >12% 29.4%
Operating Margin Operating MarginOperating income as a percentage of revenue. Measures core business profitability before interest and taxes.Excellent: >25% | Good: >15% 34.4%
?/25
Financial Strength
Can it survive tough times?
Graham's Principle: Low debt, strong liquidity, and adequate interest coverage protect against bankruptcy and provide stability during economic downturns.
Debt-to-Equity Ratio D/E RatioTotal debt divided by shareholder equity. Lower values indicate less reliance on borrowed money to fund operations.Excellent: <0.3x | Good: <0.5x 0.19x
Current Ratio Current RatioCurrent assets divided by current liabilities. Measures ability to pay short-term obligations within one year.Excellent: >2.0x | Good: >1.5x 1.38x
Interest Coverage Interest CoverageOperating income divided by interest expense. Shows how easily a company can pay interest on its debt.Excellent: >10x | Good: >5x N/A
Altman Z-Score Altman Z-ScoreBankruptcy prediction formula combining profitability, leverage, liquidity, and solvency ratios.Safe: >3.0 | Gray zone: 1.8-3.0 8.92
?/25
Cash Flow Quality
Is the profit real?
Munger's Test: "Show me the cash." Accounting profits can be manipulated, but cash flow doesn't lie. Great businesses generate real, spendable cash.
Free Cash Flow Free Cash FlowOperating cash flow minus capital expenditures. The actual cash available after maintaining the business.Excellent: Positive and growing $290.49M
OCF vs Net Income Cash vs EarningsOperating cash flow divided by net income. Values above 1.0 mean cash earnings exceed accounting earnings - a sign of quality.Excellent: >1.2x | Good: >1.0x 1.43x
FCF Margin FCF MarginFree cash flow as a percentage of revenue. Shows how much real cash profit is generated per dollar of sales.Excellent: >15% | Good: >10% 41.3%
Cash Conversion Cycle Cash ConversionDays between paying suppliers and receiving cash from customers. Lower is better - means faster cash collection.Excellent: <30 days | Good: <60 days -1,080 days
?/25
Growth & Consistency
Is it getting better?
Lynch's Approach: Sustainable growth matters. We use log-linear regression to identify consistent long-term trends, not just year-over-year noise.
Revenue Growth (5yr) Revenue GrowthAnnualized revenue growth rate using log-linear regression over 5 years. Smooths out year-to-year volatility.Excellent: >15% | Good: >10% 10.1%
Net Income Growth (5yr) Profit GrowthAnnualized net income growth rate using log-linear regression. Shows whether profits are consistently expanding.Excellent: >15% | Good: >10% 18.0%
FCF Growth (5yr) Cash Flow GrowthAnnualized free cash flow growth rate. Growing FCF means the business generates more real cash over time.Excellent: >15% | Good: >10% 19.4%
Piotroski F-Score Piotroski F-Score9-point checklist measuring profitability, leverage, and efficiency improvements. Higher scores indicate stronger fundamentals.Excellent: 8-9 | Good: 6-7 8/9

🎯 Recent Earnings Momentum

A separate, shorter-horizon signal — not part of the long-term quality score above. Standardized Unexpected Earnings (SUE) measures how far QLYS's latest quarter beat or missed its own seasonal earnings trend.

+0.09 In Line
−4−20+2+4
Strong missMissIn lineBeatStrong beat

View QLYS's full earnings-surprise history and what this signal means →

💡 Quality Is Only Half the Picture

A high quality score means QLYS shows strong business fundamentals. But even the best business can be a poor investment at the wrong price. As Warren Buffett says: "Price is what you pay, value is what you get."

To complete your analysis, examine our Valuation Trilogy:

26.1%
Fair Discount
-50% (Overvalued) 0% (Fair Value) +50% (Undervalued)
QLYS is trading at 26.1% below its estimated intrinsic value
Margin of Safety
+26.1%
Brina Gap ↗
-17.0%
Market Overestimates
↑ UNDER
+50%
Brina Gap
-50%
↓ OVER
← OVERVALUED
-100%
Margin of Safety
UNDERVALUED →
+100%
UNDERESTIMATED
GROWTH
DOUBLE
DISCOUNT
EXPENSIVE
HYPE
VALUE
TRAP
VALUE TRAP

In the Brina Matrix, Qualys, Inc. (QLYS) is in Value Trap territory — the stock looks cheap at Margin of Safety +26.10% relative to historical earnings, but the Brina Gap of -17.0% shows the current price still assumes faster growth than the business can actually deliver. The apparent bargain does not hold up on a forward basis.

Two independent signals plotted on a single chart. The horizontal axis is the Margin of Safety — it tells you whether the stock is cheap or expensive relative to what the business has historically generated for owners. The vertical axis is the Brina Gap — it tells you whether the market is underestimating or overestimating how fast the business can grow going forward.

They are derived from completely different data sources and answer completely different questions. The Margin of Safety reads the past. The Brina Gap reads the present business economics and compares them against what the current stock price is already betting on about the future.

When both point the same way — DOUBLE DISCOUNT (top-right) — the two independent signals agree the stock is undervalued. In the full S&P 500 backtest (2010–2024), the framework's sharpest edge proved to be its negative screen: it flags value traps at a 59.5% hit rate and beats the classic Margin of Safety head-to-head. Across the full validation, the Gap ranked first among all pure valuation metrics tested.

The most dangerous quadrant is not the most obvious one. VALUE TRAP (bottom-right) looks cheap relative to historical earnings, but the Brina Gap negative reveals the current price still assumes faster growth than the business can actually deliver. The apparent bargain doesn't hold up on a forward basis — you are still overpaying for growth that isn't there. Without the Brina Gap, this is indistinguishable from a genuine opportunity. The matrix separates them instantly.

UNDERESTIMATED GROWTH (top-left) is expensive on history but the market is still underestimating forward compounding power — a watchlist candidate if the valuation gap closes. EXPENSIVE HYPE (bottom-left) is unfavorable on both dimensions.

The dot shows where Qualys, Inc. sits today. Its quadrant is your starting point — not a final verdict.

The Brina Gap measures the difference between the growth a business can fundamentally sustain and the growth the market is already pricing in.

A positive Brina Gap means the market is underestimating the business. The stock price assumes a lower growth rate than the company's economics actually support — the business is quietly compounding ahead of market expectations. A negative Brina Gap means the opposite: the price already bakes in growth the fundamentals don't support.

This is the signal that separates a genuine bargain from a value trap. A cheap stock (high Margin of Safety) can still destroy capital if the business is deteriorating. The Brina Gap tells you whether the forward economics back up the historical discount — or contradict it.

Most analytical tools focus exclusively on valuation — whether a stock is cheap. Far fewer systematically compare what the business can actually grow against what the price is assuming. That comparison is where the most reliable mispricings live.

The Brina Gap is the difference between two independently derived growth rates:

Fundamental Growth Rate — calculated from the business's own economics: ROIC × reinvestment rate. This is what the company is structurally capable of growing at based on how efficiently it deploys capital and how much it reinvests.

Market-Implied Growth Rate — derived by reverse DCF. We solve for the growth rate that, when plugged into a standard DCF model, produces exactly the current Enterprise Value. This is the growth rate the market is silently betting on every time someone buys or sells the stock.

Brina Gap = Fundamental Growth Rate − Market-Implied Growth Rate

A positive result means the business can grow faster than the price assumes. A negative result means the price assumes more growth than the fundamentals support. The further from zero, the stronger the signal.

💎
Intrinsic Value
$8.86B
What is the business actually worth?
🛡
Margin of Safety
26.1%
How much discount are you getting?
🎯
Expected Annual Return
27.0% if market re-prices to value
-24.1% if the Brina Gap closes
1.8% business alone
What return might you earn?

📈 Price Action Check

Market trend context — not part of the Zyberno Score

12-1 Momentum
+3.3%
Momentum Percentile
33 / 100
% of 52-Week High
92.8%
Neutral Momentum

The price trend is unremarkable in either direction — momentum neither confirms nor contradicts the quality and valuation signals above. Full momentum analysis →

View Full QLYS Report Find More Quality Stocks

Conclusion: Is QLYS a Good Stock?

According to Zyberno's analysis, Qualys, Inc. (QLYS) is a Great Business, earning a Zyberno Score of 92/100.

What drives QLYS's score

Zyberno's analysis of QLYS's fundamentals identifies the following key drivers. An ROE of 37.2% is well above the 15% quality threshold, indicating Qualys, Inc. generates exceptional returns from shareholders' equity — a hallmark of businesses with durable competitive advantages. ROIC of 51.7% comfortably exceeds the cost of capital for most businesses, signaling that Qualys, Inc. creates significant value on every dollar of capital deployed. A net margin of 29.4% is exceptional — Qualys, Inc. keeps 29 cents of profit from every dollar of revenue after all expenses. With a debt-to-equity ratio of 0.19x, Qualys, Inc. carries minimal leverage — a sign of financial conservatism that reduces risk in economic downturns. A free cash flow margin of 41.3% is impressive, demonstrating that Qualys, Inc. converts a significant share of revenue into real cash available to shareholders. Revenue growth of approximately 10.1% annually signals consistent business expansion. A Piotroski F-Score of 8/9 — near perfect — signals that Qualys, Inc.'s financial health is improving across profitability, leverage, and operating efficiency simultaneously.

According to Zyberno's valuation model, at its current price of $187.05, QLYS appears to be moderately undervalued compared to an estimated intrinsic value per share of $253.11, with a margin of safety of 26.1%. Based on current pricing and fundamentals, Zyberno's model estimates a 5-year annual return of 27.0%.

The Brina Gap measures the difference between the growth a business can fundamentally sustain and the growth the market is already pricing in. Qualys, Inc.'s Brina Gap is -17.0% — the enterprise value implies the market expects much faster growth than the business can actually deliver based on its return on invested capital and reinvestment rate. This is a strong signal that forward compounding capacity is being significantly overestimated.

Zyberno's score and valuation reflect the direct output of the model — business quality from fundamentals, margin of safety from owner earnings, Brina Gap from the reverse DCF. The numbers are not adjusted toward the current price, analyst ratings, or market sentiment. The score measures the quality of the business. The valuation measures the price you pay for it.

Zyberno Verdict

According to Zyberno's model, Qualys, Inc. (QLYS) is a quality business requiring caution — a Great Business (92/100) with an apparent Margin of Safety of 26.1%, but a Brina Gap of -17.0% reveals the current price still assumes faster growth than the business can deliver.

❓ Frequently Asked Questions

What does QLYS's Zyberno Score of 92/100 mean?

According to Zyberno's scoring model, a score of 92/100 places Qualys, Inc. in the Great Business category — exceptional capital returns and consistent cash generation across all measurement periods. Zyberno's model scores 75–100 as excellent, 65–74 as good, 50–64 as average, 30–49 as below average, and below 30 as poor, based on the investment frameworks of Buffett, Graham, Lynch, and Munger. Note that a high quality score measures business fundamentals, not whether the stock is currently priced attractively — for that, see the margin of safety analysis.

What makes a stock "high quality"?

A high-quality stock typically exhibits: strong returns on equity and invested capital (indicating competitive advantages), healthy profit margins, low debt levels, ample liquidity, consistent cash flow generation, and sustainable growth. We analyze 16 key metrics across four categories - Profitability (ROE, ROIC, margins), Financial Strength (debt, liquidity, coverage), Cash Flow Quality (FCF, OCF vs earnings), and Growth & Consistency (revenue/profit trends, Piotroski score) - drawing from the investment philosophies of Buffett, Graham, Lynch, and Munger.

How is the quality score different from a stock rating?

Our quality score measures business fundamentals - how well the company operates, generates profits, and maintains financial health. Unlike analyst "buy/sell" ratings, we don't tell you whether to purchase the stock. A company can have excellent quality (great business) but poor investment potential (if overpriced), or vice versa. For valuation analysis, see our Margin of Safety page.

Why do you use Owner Earnings instead of regular earnings?

Owner Earnings, a concept popularized by Warren Buffett, represents the true cash available to shareholders after maintaining the business. Unlike accounting earnings, which can be manipulated through depreciation schedules and accruals, Owner Earnings = Operating Cash Flow minus Maintenance Capital Expenditures. This gives a clearer picture of what a business actually generates for its owners. Learn more about QLYS's Owner Earnings.

How often is the quality score updated?

Quality scores are recalculated whenever new financial data becomes available, typically after quarterly earnings reports. The underlying metrics (ROE, ROIC, debt ratios, etc.) come from company filings and are updated as soon as they're reported. For the most comprehensive and up-to-date data, visit the full QLYS stock report.

📊 Full QLYS Stock Report

Complete financial data, charts, all 250+ metrics, and detailed analysis for Qualys, Inc..

🎯 QLYS Earnings Surprise (SUE)

See whether Qualys, Inc. is beating or missing its own earnings trend — Standardized Unexpected Earnings and post-earnings drift.

🔍 Stock Screener

Find more high-quality stocks using our advanced screening tools with custom filters.
DISCLAIMER: Zyberno's financial tools, stock screeners, investment calculators, and market indicators are for educational purposes only and do not constitute financial advice. Data may be delayed, incomplete, or inaccurate. All investments involve risk, including loss of principal. Past performance of stocks and other securities does not guarantee future results. Before making investment decisions, consult with a qualified financial professional.
Scroll to Top