MBCSX vs. MEFAX

Last updated Jun 3, 2026

MBCSX (MassMutual Blue Chip Growth Fund) and MEFAX (MassMutual Mid Cap Growth Fund) are both mutual funds - MBCSX is a Large Cap Growth Equities fund managed by MassMutual, while MEFAX is a Mid Cap Growth Equities fund managed by MassMutual. Over the past 10 years, MBCSX returned 17.30%/yr vs 10.32%/yr for MEFAX. Their correlation of 0.89 suggests significant overlap in exposure. MBCSX charges 0.73%/yr vs 1.20%/yr for MEFAX.

Performance

MBCSX vs. MEFAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MassMutual Blue Chip Growth Fund (MBCSX) and MassMutual Mid Cap Growth Fund (MEFAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MBCSX achieves a 4.17% return, which is significantly lower than MEFAX's 5.32% return. Over the past 10 years, MBCSX has outperformed MEFAX with an annualized return of 17.30%, while MEFAX has yielded a comparatively lower 10.32% annualized return.

MBCSX

• 1D: 0.46%
• 1M: 4.89%
• YTD: 4.17%
• 6M: 4.48%
• 1Y: 19.29%
• 3Y*: 23.54%
• 5Y*: 12.14%
• 10Y*: 17.30%

MEFAX

• 1D: 0.19%
• 1M: 2.74%
• YTD: 5.32%
• 6M: 5.34%
• 1Y: 12.16%
• 3Y*: 9.99%
• 5Y*: 3.13%
• 10Y*: 10.32%

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

MBCSX vs. MEFAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MBCSX MassMutual Blue Chip Growth Fund	4.17%	16.68%	35.05%	51.00%	-34.11%	17.05%	33.53%	38.41%	0.22%	34.43%
MEFAX MassMutual Mid Cap Growth Fund	5.32%	3.19%	10.80%	19.11%	-24.58%	13.75%	25.52%	40.75%	-3.88%	24.12%

Correlation

The correlation between MBCSX and MEFAX is 0.61, 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	0.61
Correlation (3Y) Calculated over the trailing 3-year period	0.70
Correlation (5Y) Calculated over the trailing 5-year period	0.81
Correlation (10Y) Calculated over the trailing 10-year period	0.83
Correlation (All Time) Calculated using the full available price history since Jun 1, 2001	0.89

Over the past year, the correlation between MBCSX and MEFAX has dropped to 0.61 - well below their long-term average of 0.89, suggesting their price drivers have been diverging.

Return for Risk

MBCSX vs. MEFAX — Risk / Return Rank

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

MBCSX

MBCSX Risk / Return Rank: 16
MBCSX Sharpe Ratio Rank: 19
MBCSX Sortino Ratio Rank: 18
MBCSX Omega Ratio Rank: 18
MBCSX Calmar Ratio Rank: 11
MBCSX Martin Ratio Rank: 12

MEFAX

MEFAX Risk / Return Rank: 12
MEFAX Sharpe Ratio Rank: 11
MEFAX Sortino Ratio Rank: 11
MEFAX Omega Ratio Rank: 10
MEFAX Calmar Ratio Rank: 12
MEFAX Martin Ratio Rank: 15

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.

MBCSX vs. MEFAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MassMutual Blue Chip Growth Fund (MBCSX) and MassMutual Mid Cap Growth Fund (MEFAX). 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.

	MBCSX	MEFAX	Difference
Sharpe ratio Return per unit of total volatility	1.27	0.86	+0.41
Sortino ratio Return per unit of downside risk	1.77	1.33	+0.45
Omega ratio Gain probability vs. loss probability	1.23	1.15	+0.07
Calmar ratio Return relative to maximum drawdown	1.13	1.22	-0.09
Martin ratio Return relative to average drawdown	3.67	4.45	-0.78
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MBCSX vs. MEFAX - Sharpe Ratio Comparison

The current MBCSX Sharpe Ratio is 1.27, which is higher than the MEFAX Sharpe Ratio of 0.86. The chart below compares the historical Sharpe Ratios of MBCSX and MEFAX, 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

	MBCSX	MEFAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.27	0.86	+0.41
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.41	0.11	+0.29
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.68	0.43	+0.25
Sharpe Ratio (All Time) Calculated using the full available price history	0.44	0.39	+0.05

Drawdowns

MBCSX vs. MEFAX - Drawdown Comparison

The maximum MBCSX drawdown since its inception was -54.66%, roughly equal to the maximum MEFAX drawdown of -56.04%. Use the drawdown chart below to compare losses from any high point for MBCSX and MEFAX.

Drawdown Indicators

	MBCSX	MEFAX	Difference
Max Drawdown Largest peak-to-trough decline	-54.66%	-56.04%	+1.38%
Max Drawdown (1Y) Largest decline over 1 year	-17.47%	-10.45%	-7.02%
Max Drawdown (3Y) Largest decline over 3 years	-22.92%	-34.46%	+11.54%
Max Drawdown (5Y) Largest decline over 5 years	-48.37%	-45.14%	-3.23%
Max Drawdown (10Y) Largest decline over 10 years	-48.37%	-45.14%	-3.23%
Current Drawdown Current decline from peak	0.00%	-14.19%	+14.19%
Average Drawdown Average peak-to-trough decline	-12.03%	-11.43%	-0.60%
Ulcer Index Depth and duration of drawdowns from previous peaks	5.37%	2.85%	+2.52%

Volatility

MBCSX vs. MEFAX - Volatility Comparison

The current volatility for MassMutual Blue Chip Growth Fund (MBCSX) is 3.47%, while MassMutual Mid Cap Growth Fund (MEFAX) has a volatility of 3.87%. This indicates that MBCSX experiences smaller price fluctuations and is considered to be less risky than MEFAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MBCSX	MEFAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.47%	3.87%	-0.40%
Volatility (6M) Calculated over the trailing 6-month period	11.80%	11.27%	+0.53%
Volatility (1Y) Calculated over the trailing 1-year period	15.84%	14.66%	+1.18%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	29.81%	27.46%	+2.35%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	25.59%	23.94%	+1.65%

MBCSX vs. MEFAX - Expense Ratio Comparison

MBCSX has a 0.73% expense ratio, which is lower than MEFAX's 1.20% expense ratio.

Dividends

MBCSX vs. MEFAX - Dividend Comparison

MBCSX's dividend yield for the trailing twelve months is around 41.56%, more than MEFAX's 32.43% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MBCSX MassMutual Blue Chip Growth Fund	41.56%	43.29%	13.12%	23.06%	18.44%	21.93%	4.59%	11.06%	6.70%	4.00%	4.77%	18.85%
MEFAX MassMutual Mid Cap Growth Fund	32.43%	34.16%	21.40%	7.62%	20.71%	29.49%	6.92%	12.81%	12.06%	7.66%	5.32%	10.27%

Frequently Asked Questions

Can I hold both MBCSX and MEFAX in my portfolio?

MBCSX and MEFAX have a correlation of 0.61, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MBCSX or MEFAX?

MEFAX has higher volatility (3.87%) compared to MBCSX (3.47%). In terms of maximum drawdown, MBCSX dropped -54.66% vs MEFAX's -56.04%.

Which has better risk-adjusted returns?

MBCSX currently has the higher Sharpe Ratio (1.27 vs 0.86), 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.