MRGAX vs. WBREOX

Last updated Jul 17, 2026

MRGAX (MFS Core Equity Fund) and WBREOX (CIT: BlackRock Equity Index Fund Class 1) are both Large Cap Blend Equities funds. Over the past year, MRGAX returned 16.08% vs 21.85% for WBREOX. A 0.77 correlation means they provide meaningful diversification when combined. MRGAX charges 0.93%/yr vs 0.02%/yr for WBREOX.

Performance

MRGAX vs. WBREOX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Core Equity Fund (MRGAX) and CIT: BlackRock Equity Index Fund Class 1 (WBREOX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MRGAX achieves a 8.95% return, which is significantly lower than WBREOX's 10.88% return.

MRGAX

• 1D: 0.31%
• 1M: 1.57%
• 6M: 6.81%
• YTD: 8.95%
• 1Y: 16.08%
• 3Y*: 16.19%
• 5Y*: 10.17%
• 10Y*: 13.95%

WBREOX

• 1D: 0.38%
• 1M: 0.49%
• 6M: 9.25%
• YTD: 10.88%
• 1Y: 21.85%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

MRGAX vs. WBREOX - Yearly Performance Comparison

	2026 (YTD)	2025
MRGAX MFS Core Equity Fund	8.95%	12.50%
WBREOX CIT: BlackRock Equity Index Fund Class 1	10.88%	16.64%

Correlation

The correlation between MRGAX and WBREOX is 0.84, 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	0.84
Correlation (All Time) Calculated using the full available price history since Jan 3, 2025	0.77

The correlation between MRGAX and WBREOX has been stable across timeframes, ranging from 0.77 to 0.84 - a consistent structural relationship.

Return for Risk

MRGAX vs. WBREOX — Risk / Return Rank

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

MRGAX

MRGAX Risk / Return Rank: 35
MRGAX Sharpe Ratio Rank: 35
MRGAX Sortino Ratio Rank: 33
MRGAX Omega Ratio Rank: 34
MRGAX Calmar Ratio Rank: 33
MRGAX Martin Ratio Rank: 40

WBREOX

WBREOX Risk / Return Rank: 74
WBREOX Sharpe Ratio Rank: 72
WBREOX Sortino Ratio Rank: 71
WBREOX Omega Ratio Rank: 67
WBREOX Calmar Ratio Rank: 75
WBREOX Martin Ratio Rank: 83

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.

MRGAX vs. WBREOX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Core Equity Fund (MRGAX) and CIT: BlackRock Equity Index Fund Class 1 (WBREOX). 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.

	MRGAX	WBREOX	Difference
Sharpe ratio: Return per unit of total volatility	1.33	1.90	-0.57
Sortino ratio: Return per unit of downside risk	1.87	2.70	-0.82
Omega ratio: Gain probability vs. loss probability	1.24	1.34	-0.10
Calmar ratio: Return relative to maximum drawdown	1.73	2.75	-1.01
Martin ratio: Return relative to average drawdown	7.03	11.78	-4.75

MRGAX vs. WBREOX - Sharpe Ratio Comparison

The current MRGAX Sharpe Ratio is 1.33, which is comparable to the WBREOX Sharpe Ratio of 1.90. The chart below compares the historical Sharpe Ratios of MRGAX and WBREOX, 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

MRGAX vs. WBREOX - Drawdown Comparison

The maximum MRGAX drawdown since its inception was -54.04%, which is greater than WBREOX's maximum drawdown of -19.07%. Use the drawdown chart below to compare losses from any high point for MRGAX and WBREOX.

Drawdown Indicators

	MRGAX	WBREOX	Difference
Max Drawdown Largest peak-to-trough decline	-54.04%	-19.07%	-34.97%
Max Drawdown (1Y) Largest decline over 1 year	-9.53%	-8.89%	-0.64%
Max Drawdown (3Y) Largest decline over 3 years	-19.22%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-23.08%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-33.41%	—	—
Current Drawdown Current decline from peak	0.00%	-0.74%	+0.74%
Average Drawdown Average peak-to-trough decline	-8.24%	-2.54%	-5.70%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.35%	1.97%	+0.38%

Volatility

MRGAX vs. WBREOX - Volatility Comparison

The current volatility for MFS Core Equity Fund (MRGAX) is 3.42%, while CIT: BlackRock Equity Index Fund Class 1 (WBREOX) has a volatility of 3.62%. This indicates that MRGAX experiences smaller price fluctuations and is considered to be less risky than WBREOX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MRGAX	WBREOX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.42%	3.62%	-0.20%
Volatility (6M) Calculated over the trailing 6-month period	9.87%	9.92%	-0.05%
Volatility (1Y) Calculated over the trailing 1-year period	12.45%	12.88%	-0.43%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.87%	18.37%	-1.50%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.76%	18.37%	-0.61%

MRGAX vs. WBREOX - Expense Ratio Comparison

MRGAX has a 0.93% expense ratio, which is higher than WBREOX's 0.02% expense ratio.

Dividends

MRGAX vs. WBREOX - Dividend Comparison

MRGAX's dividend yield for the trailing twelve months is around 12.48%, while WBREOX has not paid dividends to shareholders.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MRGAX MFS Core Equity Fund	12.48%	13.60%	8.21%	2.54%	3.83%	7.28%	1.54%	3.20%	11.09%	6.27%	3.65%	11.02%
WBREOX CIT: BlackRock Equity Index Fund Class 1	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both MRGAX and WBREOX in my portfolio?

MRGAX and WBREOX have a correlation of 0.84, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MRGAX or WBREOX?

WBREOX has higher volatility (3.62%) compared to MRGAX (3.42%). In terms of maximum drawdown, MRGAX dropped -54.04% vs WBREOX's -19.07%.

Which has better risk-adjusted returns?

WBREOX currently has the higher Sharpe Ratio (1.90 vs 1.33), 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.