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CMGIX vs. WFSPX
Performance
Return for Risk
Drawdowns
Volatility
Dividends

CMGIX vs. WFSPX

Last updated Jun 25, 2026

CMGIX (BlackRock Mid-Cap Growth Equity Portfolio) and WFSPX (iShares S&P 500 Index Fund Class K) are both mutual funds - CMGIX is a Mid Cap Growth Equities fund managed by BlackRock, while WFSPX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, CMGIX returned 12.94%/yr vs 15.51%/yr for WFSPX. Their correlation of 0.85 suggests significant overlap in exposure. CMGIX charges 0.80%/yr vs 0.03%/yr for WFSPX.

Performance

CMGIX vs. WFSPX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in BlackRock Mid-Cap Growth Equity Portfolio (CMGIX) and iShares S&P 500 Index Fund Class K (WFSPX). The values are adjusted to include any dividend payments, if applicable.

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Returns By Period

In the year-to-date period, CMGIX achieves a 9.96% return, which is significantly higher than WFSPX's 8.19% return. Over the past 10 years, CMGIX has underperformed WFSPX with an annualized return of 12.94%, while WFSPX has yielded a comparatively higher 15.51% annualized return.

CMGIX

1D
-1.98%
1M
5.09%
YTD
9.96%
6M
6.76%
1Y
6.92%
3Y*
12.01%
5Y*
0.90%
10Y*
12.94%

WFSPX

1D
-1.43%
1M
-1.34%
YTD
8.19%
6M
6.86%
1Y
22.29%
3Y*
20.77%
5Y*
13.11%
10Y*
15.51%
*Multi-year figures are annualized to reflect compound growth (CAGR)

CMGIX vs. WFSPX - Yearly Performance Comparison

2026 (YTD)202520242023202220212020201920182017
CMGIX
BlackRock Mid-Cap Growth Equity Portfolio		9.96%0.49%12.44%28.24%-37.36%14.51%46.13%36.19%2.88%34.59%
WFSPX
iShares S&P 500 Index Fund Class K		8.19%17.83%24.94%26.25%-18.14%28.63%18.43%31.45%-4.83%21.27%

Correlation

The correlation between CMGIX and WFSPX is 0.81, 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

0.81

Correlation (3Y)
Calculated over the trailing 3-year period

0.83

Correlation (5Y)
Calculated over the trailing 5-year period

0.86

Correlation (10Y)
Calculated over the trailing 10-year period

0.84

Correlation (All Time)
Calculated using the full available price history since Dec 27, 1996

0.85

The correlation between CMGIX and WFSPX has been stable across timeframes, ranging from 0.81 to 0.86 - a consistent structural relationship.

Compare stocks, funds, or ETFs

Search for stocks, ETFs, and funds for a quick comparison or use the comparison tool for more options.

BlackRock Mid-Cap Growth Equity Portfolio

iShares S&P 500 Index Fund Class K

Often compared with CMGIX:
CMGIX vs. FDEGXCMGIX vs. PCBIXCMGIX vs. MAEGXCMGIX vs. QQQCMGIX vs. VONGCMGIX vs. JLGMXCMGIX vs. FSCSX
Often compared with WFSPX:
WFSPX vs. JLGMXWFSPX vs. VOOWFSPX vs. FSPGXWFSPX vs. FXAIXWFSPX vs. BRMKXWFSPX vs. IVVWFSPX vs. APGYX

Return for Risk

CMGIX vs. WFSPX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.
CMGIX
CMGIX Risk / Return Rank: 77
Overall Rank
CMGIX Sharpe Ratio Rank: 66
Sharpe Ratio Rank
CMGIX Sortino Ratio Rank: 66
Sortino Ratio Rank
CMGIX Omega Ratio Rank: 66
Omega Ratio Rank
CMGIX Calmar Ratio Rank: 77
Calmar Ratio Rank
CMGIX Martin Ratio Rank: 88
Martin Ratio Rank
WFSPX
WFSPX Risk / Return Rank: 5252
Overall Rank
WFSPX Sharpe Ratio Rank: 4848
Sharpe Ratio Rank
WFSPX Sortino Ratio Rank: 4545
Sortino Ratio Rank
WFSPX Omega Ratio Rank: 4747
Omega Ratio Rank
WFSPX Calmar Ratio Rank: 5454
Calmar Ratio Rank
WFSPX Martin Ratio Rank: 6666
Martin Ratio Rank
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.

CMGIX vs. WFSPX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for BlackRock Mid-Cap Growth Equity Portfolio (CMGIX) and iShares S&P 500 Index Fund Class K (WFSPX). 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.

CMGIXWFSPXDifference
Sharpe ratioReturn per unit of total volatility
0.40
1.90

-1.49

Sortino ratioReturn per unit of downside risk
0.71
2.58

-1.87

Omega ratioGain probability vs. loss probability

1.08

1.34

-0.26

Calmar ratioReturn relative to maximum drawdown

0.60

2.67

-2.07

Martin ratioReturn relative to average drawdown

1.84

11.99

-10.15

CMGIX vs. WFSPX - Sharpe Ratio Comparison

The current CMGIX Sharpe Ratio is 0.40, which is lower than the WFSPX Sharpe Ratio of 1.90. The chart below compares the historical Sharpe Ratios of CMGIX and WFSPX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

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Drawdowns

CMGIX vs. WFSPX - Drawdown Comparison

The maximum CMGIX drawdown since its inception was -73.85%, which is greater than WFSPX's maximum drawdown of -58.21%. Use the drawdown chart below to compare losses from any high point for CMGIX and WFSPX.

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Drawdown Indicators

CMGIXWFSPXDifference

Max Drawdown

Largest peak-to-trough decline

-73.85%

-58.21%

-15.64%

Max Drawdown (1Y)

Largest decline over 1 year

-14.90%

-8.90%

-6.00%

Max Drawdown (3Y)

Largest decline over 3 years

-29.77%

-18.74%

-11.03%

Max Drawdown (5Y)

Largest decline over 5 years

-45.96%

-24.51%

-21.45%

Max Drawdown (10Y)

Largest decline over 10 years

-45.96%

-33.74%

-12.22%

Current Drawdown

Current decline from peak

-6.76%

-3.13%

-3.63%

Average Drawdown

Average peak-to-trough decline

-28.62%

-12.76%

-15.86%

Ulcer Index

Depth and duration of drawdowns from previous peaks

4.81%

1.98%

+2.83%

Volatility

CMGIX vs. WFSPX - Volatility Comparison

BlackRock Mid-Cap Growth Equity Portfolio (CMGIX) has a higher volatility of 8.10% compared to iShares S&P 500 Index Fund Class K (WFSPX) at 4.90%. This indicates that CMGIX's price experiences larger fluctuations and is considered to be riskier than WFSPX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

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Volatility by Period

CMGIXWFSPXDifference

Volatility (1M)

Calculated over the trailing 1-month period

8.10%

4.90%

+3.20%

Volatility (6M)

Calculated over the trailing 6-month period

18.04%

9.93%

+8.11%

Volatility (1Y)

Calculated over the trailing 1-year period

22.06%

12.56%

+9.50%

Volatility (5Y)

Calculated over the trailing 5-year period, annualized

25.23%

16.98%

+8.25%

Volatility (10Y)

Calculated over the trailing 10-year period, annualized

23.51%

18.04%

+5.47%

CMGIX vs. WFSPX - Expense Ratio Comparison

CMGIX has a 0.80% expense ratio, which is higher than WFSPX's 0.03% expense ratio.

Dividends

CMGIX vs. WFSPX - Dividend Comparison

CMGIX's dividend yield for the trailing twelve months is around 19.28%, more than WFSPX's 1.61% yield.

PositionTTM20252024202320222021202020192018201720162015
CMGIX
BlackRock Mid-Cap Growth Equity Portfolio		19.28%21.20%0.00%0.00%0.00%4.94%0.00%0.39%4.72%3.31%0.00%2.57%
WFSPX
iShares S&P 500 Index Fund Class K		1.61%1.72%1.41%1.50%2.02%1.82%1.66%1.99%2.00%1.62%2.37%2.49%

Frequently Asked Questions

CMGIX and WFSPX have a correlation of 0.81, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

CMGIX has higher volatility (8.10%) compared to WFSPX (4.90%). In terms of maximum drawdown, CMGIX dropped -73.85% vs WFSPX's -58.21%.

WFSPX currently has the higher Sharpe Ratio (1.90 vs 0.40), 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.

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