MUXYX vs. VIIIX

Last updated Jun 4, 2026

MUXYX (Victory S&P 500 Index Fund) and VIIIX (Vanguard Institutional Index Fund Institutional Plus Shares) are both S&P 500 funds tracking the S&P 500 Index, from Victory and Vanguard respectively. Both are passively managed. Over the past 10 years, MUXYX returned 15.08%/yr vs 15.74%/yr for VIIIX. With a 1.00 correlation, they move nearly in lockstep. MUXYX charges 0.44%/yr vs 0.02%/yr for VIIIX.

Performance

MUXYX vs. VIIIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Victory S&P 500 Index Fund (MUXYX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both investments are quite close, with MUXYX having a 11.48% return and VIIIX slightly higher at 11.70%. Both investments have delivered pretty close results over the past 10 years, with MUXYX having a 15.08% annualized return and VIIIX not far ahead at 15.74%.

MUXYX

• 1D: 0.13%
• 1M: 5.76%
• YTD: 11.48%
• 6M: 11.39%
• 1Y: 28.39%
• 3Y*: 22.23%
• 5Y*: 13.75%
• 10Y*: 15.08%

VIIIX

• 1D: 0.13%
• 1M: 5.80%
• YTD: 11.70%
• 6M: 11.74%
• 1Y: 28.99%
• 3Y*: 23.17%
• 5Y*: 14.42%
• 10Y*: 15.74%

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

MUXYX vs. VIIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MUXYX Victory S&P 500 Index Fund	11.48%	17.17%	24.62%	25.70%	-18.49%	28.01%	17.91%	30.85%	-4.84%	21.27%
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares	11.70%	17.87%	26.29%	25.79%	-18.14%	28.69%	18.41%	31.48%	-4.41%	21.82%

Correlation

The correlation between MUXYX and VIIIX is 1.00 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	1.00
Correlation (3Y) Calculated over the trailing 3-year period	0.98
Correlation (5Y) Calculated over the trailing 5-year period	0.99
Correlation (10Y) Calculated over the trailing 10-year period	0.99
Correlation (All Time) Calculated using the full available price history since Jul 8, 1997	1.00

The correlation between MUXYX and VIIIX has been stable across timeframes, ranging from 0.98 to 1.00 - a consistent structural relationship.

Return for Risk

MUXYX vs. VIIIX — Risk / Return Rank

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

MUXYX

MUXYX Risk / Return Rank: 70
MUXYX Sharpe Ratio Rank: 72
MUXYX Sortino Ratio Rank: 64
MUXYX Omega Ratio Rank: 64
MUXYX Calmar Ratio Rank: 70
MUXYX Martin Ratio Rank: 80

VIIIX

VIIIX Risk / Return Rank: 73
VIIIX Sharpe Ratio Rank: 76
VIIIX Sortino Ratio Rank: 67
VIIIX Omega Ratio Rank: 67
VIIIX Calmar Ratio Rank: 74
VIIIX 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.

MUXYX vs. VIIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Victory S&P 500 Index Fund (MUXYX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX). 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.

	MUXYX	VIIIX	Difference
Sharpe ratio: Return per unit of total volatility	2.47	2.52	-0.05
Sortino ratio: Return per unit of downside risk	3.36	3.42	-0.07
Omega ratio: Gain probability vs. loss probability	1.45	1.46	-0.01
Calmar ratio: Return relative to maximum drawdown	3.25	3.36	-0.11
Martin ratio: Return relative to average drawdown	15.11	15.69	-0.59
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MUXYX vs. VIIIX - Sharpe Ratio Comparison

The current MUXYX Sharpe Ratio is 2.47, which is comparable to the VIIIX Sharpe Ratio of 2.52. The chart below compares the historical Sharpe Ratios of MUXYX and VIIIX, 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

	MUXYX	VIIIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.47	2.52	-0.05
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.71	0.86	-0.15
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.78	0.87	-0.09
Sharpe Ratio (All Time) Calculated using the full available price history	0.57	0.50	+0.07

Drawdowns

MUXYX vs. VIIIX - Drawdown Comparison

The maximum MUXYX drawdown since its inception was -55.74%, roughly equal to the maximum VIIIX drawdown of -55.18%. Use the drawdown chart below to compare losses from any high point for MUXYX and VIIIX.

Drawdown Indicators

	MUXYX	VIIIX	Difference
Max Drawdown Largest peak-to-trough decline	-55.74%	-55.18%	-0.56%
Max Drawdown (1Y) Largest decline over 1 year	-9.01%	-8.90%	-0.11%
Max Drawdown (3Y) Largest decline over 3 years	-27.62%	-18.75%	-8.87%
Max Drawdown (5Y) Largest decline over 5 years	-28.47%	-24.50%	-3.97%
Max Drawdown (10Y) Largest decline over 10 years	-33.79%	-33.79%	0.00%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-9.57%	-10.02%	+0.45%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.93%	1.90%	+0.03%

Volatility

MUXYX vs. VIIIX - Volatility Comparison

Victory S&P 500 Index Fund (MUXYX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX) have volatilities of 2.82% and 2.83%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MUXYX	VIIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.82%	2.83%	-0.01%
Volatility (6M) Calculated over the trailing 6-month period	8.99%	8.97%	+0.02%
Volatility (1Y) Calculated over the trailing 1-year period	11.87%	11.86%	+0.01%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.44%	16.89%	+2.55%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.32%	18.06%	+1.26%

MUXYX vs. VIIIX - Expense Ratio Comparison

MUXYX has a 0.44% expense ratio, which is higher than VIIIX's 0.02% expense ratio.

Dividends

MUXYX vs. VIIIX - Dividend Comparison

MUXYX's dividend yield for the trailing twelve months is around 7.33%, more than VIIIX's 2.41% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MUXYX Victory S&P 500 Index Fund	7.33%	8.00%	16.75%	5.84%	8.25%	7.94%	7.27%	13.51%	12.31%	17.31%	8.03%	11.65%
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares	2.41%	2.11%	3.66%	2.66%	3.39%	4.79%	3.07%	2.86%	2.45%	1.84%	2.38%	2.47%

Frequently Asked Questions

Can I hold both MUXYX and VIIIX in my portfolio?

With a correlation of 1.00, MUXYX and VIIIX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, MUXYX or VIIIX?

VIIIX has higher volatility (2.83%) compared to MUXYX (2.82%). In terms of maximum drawdown, MUXYX dropped -55.74% vs VIIIX's -55.18%.

Which has better risk-adjusted returns?

VIIIX currently has the higher Sharpe Ratio (2.52 vs 2.47), 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.