MFEKX vs. MFEIX

Last updated Jun 24, 2026

MFEKX (MFS Growth R6) and MFEIX (MFS Growth I) are both Large Cap Growth Equities funds from MFS. Over the past 10 years, MFEKX returned 17.90%/yr vs 17.81%/yr for MFEIX. With a 1.00 correlation, they move nearly in lockstep. MFEKX charges 0.51%/yr vs 0.60%/yr for MFEIX.

Performance

MFEKX vs. MFEIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Growth R6 (MFEKX) and MFS Growth I (MFEIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both stocks are quite close, with MFEKX having a 3.75% return and MFEIX slightly lower at 3.70%. Both investments have delivered pretty close results over the past 10 years, with MFEKX having a 17.90% annualized return and MFEIX not far behind at 17.81%.

MFEKX

• 1D: -1.47%
• 1M: -0.14%
• YTD: 3.75%
• 6M: 2.67%
• 1Y: 13.43%
• 3Y*: 25.04%
• 5Y*: 12.69%
• 10Y*: 17.90%

MFEIX

• 1D: -1.47%
• 1M: -0.14%
• YTD: 3.70%
• 6M: 2.62%
• 1Y: 13.33%
• 3Y*: 24.98%
• 5Y*: 12.61%
• 10Y*: 17.81%

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

MFEKX vs. MFEIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MFEKX MFS Growth R6	3.75%	12.44%	49.62%	36.27%	-31.07%	23.71%	31.77%	37.82%	2.40%	30.97%
MFEIX MFS Growth I	3.70%	12.34%	49.67%	36.15%	-31.14%	23.59%	31.65%	37.69%	2.30%	30.86%

Correlation

The correlation between MFEKX and MFEIX is 1.00 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	1.00
Correlation (3Y) Calculated over the trailing 3-year period	1.00
Correlation (5Y) Calculated over the trailing 5-year period	1.00
Correlation (10Y) Calculated over the trailing 10-year period	1.00
Correlation (All Time) Calculated using the full available price history since Aug 26, 2011	1.00

The correlation between MFEKX and MFEIX has been stable across timeframes, ranging from 1.00 to 1.00 - a consistent structural relationship.

Return for Risk

MFEKX vs. MFEIX — Risk / Return Rank

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

MFEKX

MFEKX Risk / Return Rank: 11
MFEKX Sharpe Ratio Rank: 12
MFEKX Sortino Ratio Rank: 11
MFEKX Omega Ratio Rank: 11
MFEKX Calmar Ratio Rank: 9
MFEKX Martin Ratio Rank: 10

MFEIX

MFEIX Risk / Return Rank: 11
MFEIX Sharpe Ratio Rank: 11
MFEIX Sortino Ratio Rank: 11
MFEIX Omega Ratio Rank: 11
MFEIX Calmar Ratio Rank: 9
MFEIX Martin Ratio Rank: 10

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.

MFEKX vs. MFEIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Growth R6 (MFEKX) and MFS Growth I (MFEIX). 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.

	MFEKX	MFEIX	Difference
Sharpe ratio: Return per unit of total volatility	0.87	0.87	+0.01
Sortino ratio: Return per unit of downside risk	1.27	1.27	+0.01
Omega ratio: Gain probability vs. loss probability	1.16	1.16	0.00
Calmar ratio: Return relative to maximum drawdown	0.85	0.84	+0.01
Martin ratio: Return relative to average drawdown	2.73	2.71	+0.03

MFEKX vs. MFEIX - Sharpe Ratio Comparison

The current MFEKX Sharpe Ratio is 0.87, which is comparable to the MFEIX Sharpe Ratio of 0.87. The chart below compares the historical Sharpe Ratios of MFEKX and MFEIX, 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

MFEKX vs. MFEIX - Drawdown Comparison

The maximum MFEKX drawdown since its inception was -36.06%, smaller than the maximum MFEIX drawdown of -72.24%. Use the drawdown chart below to compare losses from any high point for MFEKX and MFEIX.

Drawdown Indicators

	MFEKX	MFEIX	Difference
Max Drawdown Largest peak-to-trough decline	-36.06%	-72.24%	+36.18%
Max Drawdown (1Y) Largest decline over 1 year	-17.27%	-17.30%	+0.03%
Max Drawdown (3Y) Largest decline over 3 years	-23.22%	-23.24%	+0.02%
Max Drawdown (5Y) Largest decline over 5 years	-36.06%	-36.11%	+0.05%
Max Drawdown (10Y) Largest decline over 10 years	-36.06%	-36.11%	+0.05%
Current Drawdown Current decline from peak	-2.76%	-2.77%	+0.01%
Average Drawdown Average peak-to-trough decline	-5.63%	-23.69%	+18.06%
Ulcer Index Depth and duration of drawdowns from previous peaks	5.36%	5.37%	-0.01%

Volatility

MFEKX vs. MFEIX - Volatility Comparison

MFS Growth R6 (MFEKX) and MFS Growth I (MFEIX) have volatilities of 6.54% and 6.54%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MFEKX	MFEIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.54%	6.54%	0.00%
Volatility (6M) Calculated over the trailing 6-month period	13.39%	13.39%	0.00%
Volatility (1Y) Calculated over the trailing 1-year period	16.83%	16.83%	0.00%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.03%	22.04%	-0.01%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.28%	21.33%	-0.05%

MFEKX vs. MFEIX - Expense Ratio Comparison

MFEKX has a 0.51% expense ratio, which is lower than MFEIX's 0.60% expense ratio.

Dividends

MFEKX vs. MFEIX - Dividend Comparison

MFEKX's dividend yield for the trailing twelve months is around 14.28%, less than MFEIX's 14.46% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MFEIX MFS Growth I	14.46%	14.99%	25.47%	4.86%	1.05%	2.76%	3.57%	1.57%	3.78%	2.50%	1.61%	3.65%
MFEKX MFS Growth R6	14.28%	14.82%	25.31%	4.82%	1.04%	2.74%	3.55%	1.57%	3.88%	2.49%	1.70%	3.64%

Frequently Asked Questions

Can I hold both MFEKX and MFEIX in my portfolio?

With a correlation of 1.00, MFEKX and MFEIX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, MFEKX or MFEIX?

MFEIX has higher volatility (6.54%) compared to MFEKX (6.54%). In terms of maximum drawdown, MFEKX dropped -36.06% vs MFEIX's -72.24%.

Which has better risk-adjusted returns?

MFEKX currently has the higher Sharpe Ratio (0.87 vs 0.87), 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.