QLYS vs. VST
QLYS (Qualys, Inc.) and VST (Vistra Corp.) are both stocks. QLYS operates in Software - Infrastructure (Technology), while VST operates in Utilities - Independent Power Producers (Utilities). Over the past 5 years, QLYS returned 2.00%/yr vs 57.72%/yr for VST. At a 0.18 correlation, their price movements are largely independent.
Performance
QLYS vs. VST - Performance Comparison
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Returns By Period
In the year-to-date period, QLYS achieves a -15.48% return, which is significantly lower than VST's 0.94% return.
QLYS
- 1D
- 3.52%
- 1M
- 9.73%
- YTD
- -15.48%
- 6M
- -19.23%
- 1Y
- -19.98%
- 3Y*
- -3.38%
- 5Y*
- 2.00%
- 10Y*
- 14.09%
VST
- 1D
- -2.91%
- 1M
- 4.06%
- YTD
- 0.94%
- 6M
- 0.72%
- 1Y
- -12.49%
- 3Y*
- 88.21%
- 5Y*
- 57.72%
- 10Y*
- —
QLYS vs. VST - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
QLYS Qualys, Inc. | -15.48% | -5.22% | -28.56% | 74.89% | -18.21% | 12.60% | 46.18% | 11.55% | 25.93% | 87.52% |
VST Vistra Corp. | 0.94% | 17.66% | 261.52% | 70.73% | 5.08% | 19.57% | -11.87% | 2.46% | 24.95% | 18.19% |
Correlation
The correlation between QLYS and VST is -0.06, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | -0.06 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.13 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.19 |
Correlation (All Time) Calculated using the full available price history since Oct 4, 2016 | 0.18 |
The correlation between QLYS and VST shifts across timeframes, from -0.06 (1 year) to 0.19 (5 years), reflecting how their relationship changes across market environments.
Fundamentals
QLYS:
$5.57
VST:
$8.60
QLYS:
20.16
VST:
18.87
QLYS:
0.61
VST:
0.43
QLYS:
5.93
VST:
2.41
QLYS:
$684.86M
VST:
$17.20B
QLYS:
$569.03M
VST:
$1.12B
QLYS:
$252.31M
VST:
$4.34B
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Return for Risk
QLYS vs. VST — Risk / Return Rank
QLYS
VST
QLYS vs. VST - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Qualys, Inc. (QLYS) and Vistra Corp. (VST). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.
Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.
| QLYS | VST | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.18 | ||
| Sortino ratioReturn per unit of downside risk | -0.35 | ||
| Omega ratioGain probability vs. loss probability | 0.95 | 1.00 | -0.05 |
| Calmar ratioReturn relative to maximum drawdown | -0.40 | -0.33 | -0.07 |
| Martin ratioReturn relative to average drawdown | -0.81 | -0.59 | -0.22 |
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Drawdowns
QLYS vs. VST - Drawdown Comparison
The maximum QLYS drawdown since its inception was -68.48%, which is greater than VST's maximum drawdown of -53.32%. Use the drawdown chart below to compare losses from any high point for QLYS and VST.
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Drawdown Indicators
| QLYS | VST | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -68.48% | -53.32% | -15.16% |
Max Drawdown (1Y)Largest decline over 1 year | -50.46% | -38.01% | -12.45% |
Max Drawdown (3Y)Largest decline over 3 years | -62.99% | -48.80% | -14.19% |
Max Drawdown (5Y)Largest decline over 5 years | -62.99% | -48.80% | -14.19% |
Max Drawdown (10Y)Largest decline over 10 years | -62.99% | — | — |
Current DrawdownCurrent decline from peak | -45.44% | -25.17% | -20.27% |
Average DrawdownAverage peak-to-trough decline | -20.93% | -13.75% | -7.18% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 24.68% | 21.12% | +3.56% |
Volatility
QLYS vs. VST - Volatility Comparison
The current volatility for Qualys, Inc. (QLYS) is 12.30%, while Vistra Corp. (VST) has a volatility of 14.36%. This indicates that QLYS experiences smaller price fluctuations and is considered to be less risky than VST based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| QLYS | VST | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 12.30% | 14.36% | -2.06% |
Volatility (6M)Calculated over the trailing 6-month period | 36.52% | 36.88% | -0.36% |
Volatility (1Y)Calculated over the trailing 1-year period | 45.62% | 48.93% | -3.31% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 39.93% | 48.04% | -8.11% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 39.07% | 42.22% | -3.15% |
Dividends
QLYS vs. VST - Dividend Comparison
QLYS has not paid dividends to shareholders, while VST's dividend yield for the trailing twelve months is around 0.56%.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
|---|---|---|---|---|---|---|---|---|---|---|---|
QLYS Qualys, Inc. | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
VST Vistra Corp. | 0.56% | 0.56% | 0.63% | 2.13% | 3.12% | 2.64% | 2.75% | 2.17% | 0.00% | 0.00% | 14.97% |
Financials
QLYS vs. VST - Financials Comparison
This section allows you to compare key financial metrics between Qualys, Inc. and Vistra Corp.. You can select fields from income statements, balance sheets, and cash flow statements to easily visualize and compare the financial health of both companies.
Total Revenue: Total amount of money received from sales and other business activities
QLYS vs. VST - Profitability Comparison
QLYS - Gross Margin
Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jun 2026, Qualys, Inc. reported a gross profit of 145.65M and revenue of 175.64M. Therefore, the gross margin over that period was 82.9%.
VST - Gross Margin
Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jun 2026, Vistra Corp. reported a gross profit of 0.00 and revenue of 5.64B. Therefore, the gross margin over that period was 0.0%.
QLYS - Operating Margin
Operating margin is calculated as operating income divided by revenue. For the three months ending on Jun 2026, Qualys, Inc. reported an operating income of 60.89M and revenue of 175.64M, resulting in an operating margin of 34.7%.
VST - Operating Margin
Operating margin is calculated as operating income divided by revenue. For the three months ending on Jun 2026, Vistra Corp. reported an operating income of 1.50B and revenue of 5.64B, resulting in an operating margin of 26.6%.
QLYS - Net Margin
Net margin is calculated as net income divided by revenue. For the three months ending on Jun 2026, Qualys, Inc. reported a net income of 50.64M and revenue of 175.64M, resulting in a net margin of 28.8%.
VST - Net Margin
Net margin is calculated as net income divided by revenue. For the three months ending on Jun 2026, Vistra Corp. reported a net income of 980.00M and revenue of 5.64B, resulting in a net margin of 17.4%.
Frequently Asked Questions
QLYS and VST have a correlation of -0.06, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
VST has higher volatility (14.36%) compared to QLYS (12.30%). In terms of maximum drawdown, QLYS dropped -68.48% vs VST's -53.32%.
VST currently has the higher Sharpe Ratio (-0.26 vs -0.44), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.
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