MFIOX vs. MCFIX

Last updated Jun 25, 2026

MFIOX (MFS Income Fund) and MCFIX (Mercer Core Fixed Income Fund) are both Intermediate Core-Plus Bond funds. Over the past 5 years, MFIOX returned 0.54%/yr vs -0.20%/yr for MCFIX. Their correlation of 0.86 suggests significant overlap in exposure. MFIOX charges 0.73%/yr vs 0.16%/yr for MCFIX.

Performance

MFIOX vs. MCFIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Income Fund (MFIOX) and Mercer Core Fixed Income Fund (MCFIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MFIOX achieves a 0.46% return, which is significantly higher than MCFIX's -1.21% return.

MFIOX

• 1D: 0.17%
• 1M: 0.75%
• YTD: 0.46%
• 6M: 0.67%
• 1Y: 4.60%
• 3Y*: 5.00%
• 5Y*: 0.54%
• 10Y*: 2.70%

MCFIX

• 1D: 0.11%
• 1M: 0.34%
• YTD: -1.21%
• 6M: -0.85%
• 1Y: 1.63%
• 3Y*: 3.65%
• 5Y*: -0.20%
• 10Y*: —

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

MFIOX vs. MCFIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
MFIOX MFS Income Fund	0.46%	7.37%	2.66%	7.46%	-14.14%	-0.28%	9.47%	6.30%
MCFIX Mercer Core Fixed Income Fund	-1.21%	6.64%	2.02%	6.47%	-13.69%	-1.05%	4.75%	3.31%

Correlation

The correlation between MFIOX and MCFIX is 0.82, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.82
Correlation (3Y) Calculated over the trailing 3-year period	0.87
Correlation (5Y) Calculated over the trailing 5-year period	0.90
Correlation (All Time) Calculated using the full available price history since Apr 12, 2019	0.86

The correlation between MFIOX and MCFIX has been stable across timeframes, ranging from 0.82 to 0.90 - a consistent structural relationship.

Return for Risk

MFIOX vs. MCFIX — Risk / Return Rank

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

MFIOX

MFIOX Risk / Return Rank: 26
MFIOX Sharpe Ratio Rank: 27
MFIOX Sortino Ratio Rank: 29
MFIOX Omega Ratio Rank: 27
MFIOX Calmar Ratio Rank: 26
MFIOX Martin Ratio Rank: 24

MCFIX

MCFIX Risk / Return Rank: 7
MCFIX Sharpe Ratio Rank: 8
MCFIX Sortino Ratio Rank: 7
MCFIX Omega Ratio Rank: 7
MCFIX Calmar Ratio Rank: 7
MCFIX Martin Ratio Rank: 7

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.

MFIOX vs. MCFIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Income Fund (MFIOX) and Mercer Core Fixed Income Fund (MCFIX). 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.

	MFIOX	MCFIX	Difference
Sharpe ratio: Return per unit of total volatility	1.32	0.55	+0.77
Sortino ratio: Return per unit of downside risk	1.99	0.81	+1.18
Omega ratio: Gain probability vs. loss probability	1.24	1.10	+0.15
Calmar ratio: Return relative to maximum drawdown	1.70	0.59	+1.12
Martin ratio: Return relative to average drawdown	5.18	1.51	+3.67

MFIOX vs. MCFIX - Sharpe Ratio Comparison

The current MFIOX Sharpe Ratio is 1.32, which is higher than the MCFIX Sharpe Ratio of 0.55. The chart below compares the historical Sharpe Ratios of MFIOX and MCFIX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

MFIOX vs. MCFIX - Drawdown Comparison

The maximum MFIOX drawdown since its inception was -19.07%, smaller than the maximum MCFIX drawdown of -21.68%. Use the drawdown chart below to compare losses from any high point for MFIOX and MCFIX.

Drawdown Indicators

	MFIOX	MCFIX	Difference
Max Drawdown Largest peak-to-trough decline	-19.07%	-21.68%	+2.61%
Max Drawdown (1Y) Largest decline over 1 year	-2.81%	-3.75%	+0.94%
Max Drawdown (3Y) Largest decline over 3 years	-5.88%	-6.32%	+0.44%
Max Drawdown (5Y) Largest decline over 5 years	-19.07%	-18.72%	-0.35%
Max Drawdown (10Y) Largest decline over 10 years	-19.07%	—	—
Current Drawdown Current decline from peak	-1.14%	-6.18%	+5.04%
Average Drawdown Average peak-to-trough decline	-2.18%	-8.52%	+6.34%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.92%	1.38%	-0.46%

Volatility

MFIOX vs. MCFIX - Volatility Comparison

MFS Income Fund (MFIOX) has a higher volatility of 1.12% compared to Mercer Core Fixed Income Fund (MCFIX) at 1.03%. This indicates that MFIOX's price experiences larger fluctuations and is considered to be riskier than MCFIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MFIOX	MCFIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.12%	1.03%	+0.09%
Volatility (6M) Calculated over the trailing 6-month period	2.71%	2.78%	-0.07%
Volatility (1Y) Calculated over the trailing 1-year period	3.65%	4.04%	-0.39%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.52%	6.04%	-0.52%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.88%	6.10%	-1.22%

MFIOX vs. MCFIX - Expense Ratio Comparison

MFIOX has a 0.73% expense ratio, which is higher than MCFIX's 0.16% expense ratio.

Dividends

MFIOX vs. MCFIX - Dividend Comparison

MFIOX's dividend yield for the trailing twelve months is around 4.70%, more than MCFIX's 4.32% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MCFIX Mercer Core Fixed Income Fund	4.32%	3.89%	4.54%	3.68%	3.31%	2.45%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
MFIOX MFS Income Fund	4.70%	4.70%	5.04%	4.72%	2.24%	3.29%	2.80%	3.04%	3.07%	3.26%	3.61%	4.35%

Frequently Asked Questions

Can I hold both MFIOX and MCFIX in my portfolio?

MFIOX and MCFIX have a correlation of 0.82, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MFIOX or MCFIX?

MFIOX has higher volatility (1.12%) compared to MCFIX (1.03%). In terms of maximum drawdown, MFIOX dropped -19.07% vs MCFIX's -21.68%.

Which has better risk-adjusted returns?

MFIOX currently has the higher Sharpe Ratio (1.32 vs 0.55), 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.