CI vs. MRK
CI (The Cigna Group) and MRK (Merck & Co., Inc.) are both stocks. Both are in the Healthcare sector — CI in Healthcare Plans, MRK in Drug Manufacturers - General. Over the past 10 years, CI returned 9.67%/yr vs 11.43%/yr for MRK. At a 0.31 correlation, their price movements are largely independent.
Performance
CI vs. MRK - Performance Comparison
Loading charts...
Returns By Period
In the year-to-date period, CI achieves a 7.83% return, which is significantly lower than MRK's 19.09% return. Over the past 10 years, CI has underperformed MRK with an annualized return of 9.67%, while MRK has yielded a comparatively higher 11.43% annualized return.
CI
- 1D
- 0.57%
- 1M
- -1.52%
- 6M
- 6.39%
- YTD
- 7.83%
- 1Y
- -1.09%
- 3Y*
- 3.31%
- 5Y*
- 6.50%
- 10Y*
- 9.67%
MRK
- 1D
- -1.22%
- 1M
- 4.52%
- 6M
- 13.41%
- YTD
- 19.09%
- 1Y
- 53.16%
- 3Y*
- 7.62%
- 5Y*
- 13.11%
- 10Y*
- 11.43%
CI vs. MRK - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
CI The Cigna Group | 7.83% | 1.72% | -6.27% | -7.97% | 46.68% | 12.29% | 1.83% | 7.70% | -6.46% | 52.29% |
MRK Merck & Co., Inc. | 19.09% | 9.79% | -6.26% | 1.01% | 49.42% | 1.75% | -7.20% | 22.27% | 39.95% | -1.49% |
Correlation
The correlation between CI and MRK is 0.35, which is low. Their price movements are largely independent, making them effective diversification partners.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.35 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.28 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.32 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.32 |
Correlation (All Time) Calculated using the full available price history since Mar 31, 1982 | 0.31 |
Fundamentals
CI:
$77.63B
MRK:
$305.12B
CI:
$23.64
MRK:
$3.59
CI:
12.42
MRK:
34.37
CI:
0.72
MRK:
0.03
CI:
0.28
MRK:
4.68
CI:
1.84
MRK:
6.66
CI:
$277.94B
MRK:
$65.59B
CI:
$19.38B
MRK:
$49.79B
CI:
$10.03B
MRK:
$22.69B
Compare stocks, funds, or ETFs
Search for stocks, ETFs, and funds for a quick comparison or use the comparison tool for more options.
Return for Risk
CI vs. MRK — Risk / Return Rank
CI
MRK
CI vs. MRK - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for The Cigna Group (CI) and Merck & Co., Inc. (MRK). 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.
| CI | MRK | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -1.96 | ||
| Sortino ratioReturn per unit of downside risk | -2.69 | ||
| Omega ratioGain probability vs. loss probability | 1.02 | 1.32 | -0.31 |
| Calmar ratioReturn relative to maximum drawdown | -0.13 | 4.59 | -4.73 |
| Martin ratioReturn relative to average drawdown | -0.31 | 11.28 | -11.59 |
Loading charts...
Drawdowns
CI vs. MRK - Drawdown Comparison
The maximum CI drawdown since its inception was -84.34%, which is greater than MRK's maximum drawdown of -68.61%. Use the drawdown chart below to compare losses from any high point for CI and MRK.
Loading charts...
Drawdown Indicators
| CI | MRK | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -84.34% | -68.61% | -15.73% |
Max Drawdown (1Y)Largest decline over 1 year | -21.41% | -11.37% | -10.04% |
Max Drawdown (3Y)Largest decline over 3 years | -32.10% | -43.44% | +11.34% |
Max Drawdown (5Y)Largest decline over 5 years | -32.10% | -43.44% | +11.34% |
Max Drawdown (10Y)Largest decline over 10 years | -42.47% | -43.44% | +0.97% |
Current DrawdownCurrent decline from peak | -17.09% | -4.65% | -12.44% |
Average DrawdownAverage peak-to-trough decline | -18.82% | -18.81% | -0.01% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 9.30% | 4.63% | +4.67% |
Volatility
CI vs. MRK - Volatility Comparison
The current volatility for The Cigna Group (CI) is 6.79%, while Merck & Co., Inc. (MRK) has a volatility of 9.30%. This indicates that CI experiences smaller price fluctuations and is considered to be less risky than MRK based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
Loading charts...
Volatility by Period
| CI | MRK | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 6.79% | 9.30% | -2.51% |
Volatility (6M)Calculated over the trailing 6-month period | 19.32% | 19.39% | -0.07% |
Volatility (1Y)Calculated over the trailing 1-year period | 33.09% | 27.85% | +5.24% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 28.49% | 23.97% | +4.52% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 30.73% | 23.05% | +7.68% |
Dividends
CI vs. MRK - Dividend Comparison
CI's dividend yield for the trailing twelve months is around 2.09%, less than MRK's 2.72% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
CI The Cigna Group | 2.09% | 2.19% | 2.03% | 1.64% | 1.35% | 1.74% | 0.02% | 0.02% | 0.02% | 0.02% | 0.03% | 0.03% |
MRK Merck & Co., Inc. | 2.72% | 3.12% | 3.14% | 2.72% | 2.52% | 3.41% | 3.03% | 2.48% | 2.60% | 3.36% | 3.14% | 3.43% |
Financials
CI vs. MRK - Financials Comparison
This section allows you to compare key financial metrics between The Cigna Group and Merck & Co., Inc.. 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
CI vs. MRK - Profitability Comparison
CI - Gross Margin
Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jul 2026, The Cigna Group reported a gross profit of 0.00 and revenue of 68.49B. Therefore, the gross margin over that period was 0.0%.
MRK - Gross Margin
Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jul 2026, Merck & Co., Inc. reported a gross profit of 13.34B and revenue of 16.29B. Therefore, the gross margin over that period was 81.9%.
CI - Operating Margin
Operating margin is calculated as operating income divided by revenue. For the three months ending on Jul 2026, The Cigna Group reported an operating income of 2.36B and revenue of 68.49B, resulting in an operating margin of 3.4%.
MRK - Operating Margin
Operating margin is calculated as operating income divided by revenue. For the three months ending on Jul 2026, Merck & Co., Inc. reported an operating income of -1.88B and revenue of 16.29B, resulting in an operating margin of -11.6%.
CI - Net Margin
Net margin is calculated as net income divided by revenue. For the three months ending on Jul 2026, The Cigna Group reported a net income of 1.65B and revenue of 68.49B, resulting in a net margin of 2.4%.
MRK - Net Margin
Net margin is calculated as net income divided by revenue. For the three months ending on Jul 2026, Merck & Co., Inc. reported a net income of -4.24B and revenue of 16.29B, resulting in a net margin of -26.0%.
Frequently Asked Questions
CI and MRK have a correlation of 0.35, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
MRK has higher volatility (9.30%) compared to CI (6.79%). In terms of maximum drawdown, CI dropped -84.34% vs MRK's -68.61%.
MRK currently has the higher Sharpe Ratio (1.87 vs -0.09), 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.
Find the right allocation for CI and MRK
Add both to a portfolio and optimize allocations for your target — whether that's maximizing returns, minimizing drawdowns, or balancing risk across holdings.
Open Portfolio Optimizer