MFWTX vs. CVLOX

Last updated Jun 4, 2026

MFWTX (MFS Global Total Return Fund) and CVLOX (Calamos Global Opportunities Fund) are both Global Allocation funds. Over the past 10 years, MFWTX returned 6.33%/yr vs 11.57%/yr for CVLOX. A 0.76 correlation means they provide meaningful diversification when combined. MFWTX charges 1.09%/yr vs 1.22%/yr for CVLOX.

Performance

MFWTX vs. CVLOX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Global Total Return Fund (MFWTX) and Calamos Global Opportunities Fund (CVLOX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MFWTX achieves a 5.42% return, which is significantly lower than CVLOX's 19.22% return. Over the past 10 years, MFWTX has underperformed CVLOX with an annualized return of 6.33%, while CVLOX has yielded a comparatively higher 11.57% annualized return.

MFWTX

• 1D: 0.27%
• 1M: 2.07%
• YTD: 5.42%
• 6M: 6.68%
• 1Y: 14.11%
• 3Y*: 10.76%
• 5Y*: 4.75%
• 10Y*: 6.33%

CVLOX

• 1D: 0.59%
• 1M: 6.83%
• YTD: 19.22%
• 6M: 19.51%
• 1Y: 31.04%
• 3Y*: 21.82%
• 5Y*: 10.13%
• 10Y*: 11.57%

*Multi-year figures are annualized to reflect compound growth (CAGR)

MFWTX vs. CVLOX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MFWTX MFS Global Total Return Fund	5.42%	15.48%	3.92%	10.29%	-10.86%	8.31%	9.35%	18.25%	-7.19%	14.77%
CVLOX Calamos Global Opportunities Fund	19.22%	15.84%	23.81%	13.88%	-22.17%	15.72%	31.76%	18.28%	-9.88%	20.04%

Correlation

The correlation between MFWTX and CVLOX is 0.58, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.58
Correlation (3Y) Calculated over the trailing 3-year period	0.63
Correlation (5Y) Calculated over the trailing 5-year period	0.75
Correlation (10Y) Calculated over the trailing 10-year period	0.79
Correlation (All Time) Calculated using the full available price history since Sep 10, 1996	0.76

The correlation between MFWTX and CVLOX shifts across timeframes, from 0.58 (1 year) to 0.79 (10 years), reflecting how their relationship changes across market environments.

Return for Risk

MFWTX vs. CVLOX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

MFWTX

MFWTX Risk / Return Rank: 38
MFWTX Sharpe Ratio Rank: 42
MFWTX Sortino Ratio Rank: 43
MFWTX Omega Ratio Rank: 43
MFWTX Calmar Ratio Rank: 31
MFWTX Martin Ratio Rank: 33

CVLOX

CVLOX Risk / Return Rank: 57
CVLOX Sharpe Ratio Rank: 55
CVLOX Sortino Ratio Rank: 50
CVLOX Omega Ratio Rank: 53
CVLOX Calmar Ratio Rank: 67
CVLOX Martin Ratio Rank: 60

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

MFWTX vs. CVLOX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Global Total Return Fund (MFWTX) and Calamos Global Opportunities Fund (CVLOX). 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.

	MFWTX	CVLOX	Difference
Sharpe ratio: Return per unit of total volatility	1.90	2.19	-0.29
Sortino ratio: Return per unit of downside risk	2.77	2.97	-0.21
Omega ratio: Gain probability vs. loss probability	1.35	1.40	-0.05
Calmar ratio: Return relative to maximum drawdown	2.09	3.18	-1.09
Martin ratio: Return relative to average drawdown	7.44	11.94	-4.50
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MFWTX vs. CVLOX - Sharpe Ratio Comparison

The current MFWTX Sharpe Ratio is 1.90, which is comparable to the CVLOX Sharpe Ratio of 2.19. The chart below compares the historical Sharpe Ratios of MFWTX and CVLOX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	MFWTX	CVLOX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.90	2.19	-0.29
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.52	0.70	-0.18
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.66	0.79	-0.13
Sharpe Ratio (All Time) Calculated using the full available price history	0.84	0.60	+0.24

Drawdowns

MFWTX vs. CVLOX - Drawdown Comparison

The maximum MFWTX drawdown since its inception was -33.22%, smaller than the maximum CVLOX drawdown of -46.61%. Use the drawdown chart below to compare losses from any high point for MFWTX and CVLOX.

Drawdown Indicators

	MFWTX	CVLOX	Difference
Max Drawdown Largest peak-to-trough decline	-33.22%	-46.61%	+13.39%
Max Drawdown (1Y) Largest decline over 1 year	-6.72%	-9.85%	+3.13%
Max Drawdown (3Y) Largest decline over 3 years	-8.68%	-15.16%	+6.48%
Max Drawdown (5Y) Largest decline over 5 years	-20.36%	-29.97%	+9.61%
Max Drawdown (10Y) Largest decline over 10 years	-23.37%	-29.97%	+6.60%
Current Drawdown Current decline from peak	-0.98%	0.00%	-0.98%
Average Drawdown Average peak-to-trough decline	-3.55%	-8.99%	+5.44%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.88%	2.61%	-0.73%

Volatility

MFWTX vs. CVLOX - Volatility Comparison

The current volatility for MFS Global Total Return Fund (MFWTX) is 2.14%, while Calamos Global Opportunities Fund (CVLOX) has a volatility of 5.39%. This indicates that MFWTX experiences smaller price fluctuations and is considered to be less risky than CVLOX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MFWTX	CVLOX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.14%	5.39%	-3.25%
Volatility (6M) Calculated over the trailing 6-month period	5.68%	11.85%	-6.17%
Volatility (1Y) Calculated over the trailing 1-year period	7.40%	14.30%	-6.90%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	9.13%	14.51%	-5.38%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	9.62%	14.78%	-5.16%

MFWTX vs. CVLOX - Expense Ratio Comparison

MFWTX has a 1.09% expense ratio, which is lower than CVLOX's 1.22% expense ratio.

Dividends

MFWTX vs. CVLOX - Dividend Comparison

MFWTX's dividend yield for the trailing twelve months is around 7.98%, more than CVLOX's 7.61% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
CVLOX Calamos Global Opportunities Fund	7.61%	9.10%	8.15%	0.61%	0.00%	5.71%	6.11%	1.28%	12.65%	6.04%	0.68%	1.28%
MFWTX MFS Global Total Return Fund	7.98%	8.42%	8.94%	3.69%	2.64%	10.29%	7.20%	4.41%	3.33%	2.17%	1.13%	4.29%

Frequently Asked Questions

Can I hold both MFWTX and CVLOX in my portfolio?

MFWTX and CVLOX have a correlation of 0.58, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MFWTX or CVLOX?

CVLOX has higher volatility (5.39%) compared to MFWTX (2.14%). In terms of maximum drawdown, MFWTX dropped -33.22% vs CVLOX's -46.61%.

Which has better risk-adjusted returns?

CVLOX currently has the higher Sharpe Ratio (2.19 vs 1.90), 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.