MAFOX vs. WFSPX

Last updated Jun 4, 2026

MAFOX (BlackRock Large Cap Focus Growth Fund) and WFSPX (iShares S&P 500 Index Fund) are both mutual funds - MAFOX is a Large 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, MAFOX returned 17.63%/yr vs 15.54%/yr for WFSPX. Their correlation of 0.85 suggests significant overlap in exposure. MAFOX charges 0.67%/yr vs 0.03%/yr for WFSPX.

Performance

MAFOX vs. WFSPX - Performance Comparison

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

Returns By Period

In the year-to-date period, MAFOX achieves a 15.80% return, which is significantly higher than WFSPX's 11.69% return. Over the past 10 years, MAFOX has outperformed WFSPX with an annualized return of 17.63%, while WFSPX has yielded a comparatively lower 15.54% annualized return.

MAFOX

• 1D: 0.00%
• 1M: 8.99%
• YTD: 15.80%
• 6M: 15.18%
• 1Y: 28.52%
• 3Y*: 25.86%
• 5Y*: 13.04%
• 10Y*: 17.63%

WFSPX

• 1D: 0.13%
• 1M: 5.80%
• YTD: 11.69%
• 6M: 11.72%
• 1Y: 28.93%
• 3Y*: 22.71%
• 5Y*: 14.24%
• 10Y*: 15.54%

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

MAFOX vs. WFSPX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MAFOX BlackRock Large Cap Focus Growth Fund	15.80%	12.76%	31.11%	52.63%	-38.05%	17.13%	46.85%	31.16%	3.63%	29.90%
WFSPX iShares S&P 500 Index Fund	11.69%	17.83%	24.94%	26.25%	-18.14%	28.63%	18.43%	31.45%	-4.83%	21.27%

Correlation

The correlation between MAFOX and WFSPX is 0.90, 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	0.90
Correlation (3Y) Calculated over the trailing 3-year period	0.89
Correlation (5Y) Calculated over the trailing 5-year period	0.91
Correlation (10Y) Calculated over the trailing 10-year period	0.88
Correlation (All Time) Calculated using the full available price history since Mar 6, 2000	0.86

The correlation between MAFOX and WFSPX has been stable across timeframes, ranging from 0.85 to 0.91 - a consistent structural relationship.

Return for Risk

MAFOX vs. WFSPX — Risk / Return Rank

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

MAFOX

MAFOX Risk / Return Rank: 29
MAFOX Sharpe Ratio Rank: 35
MAFOX Sortino Ratio Rank: 31
MAFOX Omega Ratio Rank: 32
MAFOX Calmar Ratio Rank: 22
MAFOX Martin Ratio Rank: 23

WFSPX

WFSPX Risk / Return Rank: 73
WFSPX Sharpe Ratio Rank: 75
WFSPX Sortino Ratio Rank: 67
WFSPX Omega Ratio Rank: 67
WFSPX Calmar Ratio Rank: 74
WFSPX 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.

MAFOX vs. WFSPX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for BlackRock Large Cap Focus Growth Fund (MAFOX) and iShares S&P 500 Index Fund (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.

	MAFOX	WFSPX	Difference
Sharpe ratio: Return per unit of total volatility	1.70	2.52	-0.82
Sortino ratio: Return per unit of downside risk	2.29	3.42	-1.13
Omega ratio: Gain probability vs. loss probability	1.30	1.46	-0.16
Calmar ratio: Return relative to maximum drawdown	1.76	3.35	-1.59
Martin ratio: Return relative to average drawdown	5.92	15.65	-9.73
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MAFOX vs. WFSPX - Sharpe Ratio Comparison

The current MAFOX Sharpe Ratio is 1.70, which is lower than the WFSPX Sharpe Ratio of 2.52. The chart below compares the historical Sharpe Ratios of MAFOX 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.

Sharpe Ratios by Period

	MAFOX	WFSPX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.70	2.52	-0.82
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.56	0.85	-0.29
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.78	0.87	-0.08
Sharpe Ratio (All Time) Calculated using the full available price history	0.12	0.13	-0.02

Drawdowns

MAFOX vs. WFSPX - Drawdown Comparison

The maximum MAFOX drawdown since its inception was -89.93%, which is greater than WFSPX's maximum drawdown of -58.21%. Use the drawdown chart below to compare losses from any high point for MAFOX and WFSPX.

Drawdown Indicators

	MAFOX	WFSPX	Difference
Max Drawdown Largest peak-to-trough decline	-89.93%	-58.21%	-31.72%
Max Drawdown (1Y) Largest decline over 1 year	-16.70%	-8.90%	-7.80%
Max Drawdown (3Y) Largest decline over 3 years	-24.48%	-18.74%	-5.74%
Max Drawdown (5Y) Largest decline over 5 years	-42.39%	-24.51%	-17.88%
Max Drawdown (10Y) Largest decline over 10 years	-42.39%	-33.74%	-8.65%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-54.23%	-12.77%	-41.46%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.95%	1.90%	+3.05%

Volatility

MAFOX vs. WFSPX - Volatility Comparison

BlackRock Large Cap Focus Growth Fund (MAFOX) has a higher volatility of 3.98% compared to iShares S&P 500 Index Fund (WFSPX) at 2.82%. This indicates that MAFOX'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.

Volatility by Period

	MAFOX	WFSPX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.98%	2.82%	+1.16%
Volatility (6M) Calculated over the trailing 6-month period	13.42%	8.97%	+4.45%
Volatility (1Y) Calculated over the trailing 1-year period	17.29%	11.85%	+5.44%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.61%	16.88%	+6.73%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.67%	18.02%	+4.65%

MAFOX vs. WFSPX - Expense Ratio Comparison

MAFOX has a 0.67% expense ratio, which is higher than WFSPX's 0.03% expense ratio.

Dividends

MAFOX vs. WFSPX - Dividend Comparison

MAFOX's dividend yield for the trailing twelve months is around 13.84%, more than WFSPX's 1.56% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MAFOX BlackRock Large Cap Focus Growth Fund	13.84%	16.03%	4.04%	3.05%	2.01%	11.20%	0.53%	5.45%	4.43%	4.06%	0.00%	4.66%
WFSPX iShares S&P 500 Index Fund	1.56%	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

Can I hold both MAFOX and WFSPX in my portfolio?

MAFOX and WFSPX have a correlation of 0.90, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MAFOX or WFSPX?

MAFOX has higher volatility (3.98%) compared to WFSPX (2.82%). In terms of maximum drawdown, MAFOX dropped -89.93% vs WFSPX's -58.21%.

Which has better risk-adjusted returns?

WFSPX currently has the higher Sharpe Ratio (2.52 vs 1.70), 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.