BMSLX vs. MFEIX

Last updated Apr 2, 2026

Compare and contrast key facts about MFS Blended Research Mid Cap Equity Fund (BMSLX) and MFS Growth I (MFEIX).

BMSLX is managed by MFS. It was launched on Aug 19, 2016. MFEIX is managed by MFS. It was launched on Jul 10, 1997.

Performance

BMSLX vs. MFEIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Blended Research Mid Cap Equity Fund (BMSLX) and MFS Growth I (MFEIX). The values are adjusted to include any dividend payments, if applicable.

BMSLX vs. MFEIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BMSLX MFS Blended Research Mid Cap Equity Fund	0.41%	8.08%	19.25%	19.81%	-13.70%	26.54%	10.44%	30.21%	-11.11%	18.04%
MFEIX MFS Growth I	-10.32%	12.34%	49.67%	36.15%	-31.14%	23.59%	31.65%	37.69%	2.30%	30.86%

Returns By Period

In the year-to-date period, BMSLX achieves a 0.41% return, which is significantly higher than MFEIX's -10.32% return.

BMSLX

• 1D: 2.76%
• 1M: -5.47%
• YTD: 0.41%
• 6M: -0.63%
• 1Y: 11.68%
• 3Y*: 14.03%
• 5Y*: 8.92%
• 10Y*: —

MFEIX

• 1D: 3.82%
• 1M: -5.75%
• YTD: -10.32%
• 6M: -10.97%
• 1Y: 9.60%
• 3Y*: 22.85%
• 5Y*: 11.27%
• 10Y*: 15.88%

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

BMSLX vs. MFEIX - Expense Ratio Comparison

BMSLX has a 0.59% expense ratio, which is lower than MFEIX's 0.60% expense ratio.

MFEIX

MFS Growth I

BMSLX

MFS Blended Research Mid Cap Equity Fund

Return for Risk

BMSLX vs. MFEIX — Risk / Return Rank

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

BMSLX

BMSLX Risk / Return Rank: 25
BMSLX Sharpe Ratio Rank: 21
BMSLX Sortino Ratio Rank: 23
BMSLX Omega Ratio Rank: 22
BMSLX Calmar Ratio Rank: 28
BMSLX Martin Ratio Rank: 30

MFEIX

MFEIX Risk / Return Rank: 18
MFEIX Sharpe Ratio Rank: 17
MFEIX Sortino Ratio Rank: 18
MFEIX Omega Ratio Rank: 17
MFEIX Calmar Ratio Rank: 19
MFEIX Martin Ratio Rank: 18

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.

BMSLX vs. MFEIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Blended Research Mid Cap Equity Fund (BMSLX) 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.

	BMSLX	MFEIX	Difference
Sharpe ratio Return per unit of total volatility	0.61	0.49	+0.12
Sortino ratio Return per unit of downside risk	0.99	0.85	+0.15
Omega ratio Gain probability vs. loss probability	1.14	1.12	+0.02
Calmar ratio Return relative to maximum drawdown	0.88	0.61	+0.27
Martin ratio Return relative to average drawdown	3.53	2.06	+1.46
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

BMSLX vs. MFEIX - Sharpe Ratio Comparison

The current BMSLX Sharpe Ratio is 0.61, which is comparable to the MFEIX Sharpe Ratio of 0.49. The chart below compares the historical Sharpe Ratios of BMSLX and MFEIX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	BMSLX	MFEIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.61	0.49	+0.12
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.49	0.52	-0.03
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.75	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.54	0.42	+0.12

Correlation

The correlation between BMSLX and MFEIX is 0.74, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

BMSLX vs. MFEIX - Dividend Comparison

BMSLX's dividend yield for the trailing twelve months is around 3.07%, less than MFEIX's 16.72% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BMSLX MFS Blended Research Mid Cap Equity Fund	3.07%	3.08%	10.98%	2.32%	5.15%	23.06%	0.94%	4.90%	8.27%	2.63%	0.47%	0.00%
MFEIX MFS Growth I	16.72%	14.99%	25.47%	4.86%	1.05%	2.76%	3.57%	1.57%	3.78%	2.50%	1.61%	3.65%

Drawdowns

BMSLX vs. MFEIX - Drawdown Comparison

The maximum BMSLX drawdown since its inception was -41.06%, smaller than the maximum MFEIX drawdown of -72.24%. Use the drawdown chart below to compare losses from any high point for BMSLX and MFEIX.

Drawdown Indicators

	BMSLX	MFEIX	Difference
Max Drawdown Largest peak-to-trough decline	-41.06%	-72.24%	+31.18%
Max Drawdown (1Y) Largest decline over 1 year	-14.24%	-17.30%	+3.06%
Max Drawdown (5Y) Largest decline over 5 years	-22.28%	-36.11%	+13.83%
Max Drawdown (10Y) Largest decline over 10 years	—	-36.11%	—
Current Drawdown Current decline from peak	-6.65%	-14.14%	+7.49%
Average Drawdown Average peak-to-trough decline	-5.12%	-23.85%	+18.73%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.57%	5.14%	-1.57%

Volatility

BMSLX vs. MFEIX - Volatility Comparison

The current volatility for MFS Blended Research Mid Cap Equity Fund (BMSLX) is 5.90%, while MFS Growth I (MFEIX) has a volatility of 6.97%. This indicates that BMSLX experiences smaller price fluctuations and is considered to be less risky than MFEIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BMSLX	MFEIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.90%	6.97%	-1.07%
Volatility (6M) Calculated over the trailing 6-month period	10.98%	12.65%	-1.67%
Volatility (1Y) Calculated over the trailing 1-year period	20.06%	21.85%	-1.79%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.41%	21.93%	-3.52%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.82%	21.20%	-1.38%