IRSVX vs. VIIIX

Last updated Jun 23, 2026

IRSVX (Voya Target Retirement 2055 Fund) and VIIIX (Vanguard Institutional Index Fund Institutional Plus Shares) are both mutual funds - IRSVX is a Target Retirement Date fund managed by Voya, while VIIIX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, IRSVX returned 12.12%/yr vs 15.65%/yr for VIIIX. With a 0.95 correlation, they move nearly in lockstep. IRSVX charges 0.24%/yr vs 0.02%/yr for VIIIX.

Performance

IRSVX vs. VIIIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Voya Target Retirement 2055 Fund (IRSVX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, IRSVX achieves a 12.83% return, which is significantly higher than VIIIX's 10.19% return. Over the past 10 years, IRSVX has underperformed VIIIX with an annualized return of 12.12%, while VIIIX has yielded a comparatively higher 15.65% annualized return.

IRSVX

• 1D: 1.14%
• 1M: 1.78%
• YTD: 12.83%
• 6M: 12.59%
• 1Y: 29.51%
• 3Y*: 19.02%
• 5Y*: 10.78%
• 10Y*: 12.12%

VIIIX

• 1D: 1.09%
• 1M: 0.47%
• YTD: 10.19%
• 6M: 9.68%
• 1Y: 27.18%
• 3Y*: 21.39%
• 5Y*: 14.24%
• 10Y*: 15.65%

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

IRSVX vs. VIIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
IRSVX Voya Target Retirement 2055 Fund	12.83%	20.81%	15.47%	20.55%	-18.81%	18.89%	17.53%	25.28%	-9.29%	21.17%
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares	10.19%	17.87%	26.29%	25.79%	-18.14%	28.69%	18.41%	31.48%	-4.41%	21.82%

Correlation

The correlation between IRSVX and VIIIX is 0.88, 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	0.88
Correlation (3Y) Calculated over the trailing 3-year period	0.92
Correlation (5Y) Calculated over the trailing 5-year period	0.94
Correlation (10Y) Calculated over the trailing 10-year period	0.95
Correlation (All Time) Calculated using the full available price history since Dec 24, 2012	0.95

The correlation between IRSVX and VIIIX has been stable across timeframes, ranging from 0.88 to 0.95 - a consistent structural relationship.

Return for Risk

IRSVX vs. VIIIX — Risk / Return Rank

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

IRSVX

IRSVX Risk / Return Rank: 80
IRSVX Sharpe Ratio Rank: 81
IRSVX Sortino Ratio Rank: 79
IRSVX Omega Ratio Rank: 76
IRSVX Calmar Ratio Rank: 78
IRSVX Martin Ratio Rank: 88

VIIIX

VIIIX Risk / Return Rank: 66
VIIIX Sharpe Ratio Rank: 64
VIIIX Sortino Ratio Rank: 59
VIIIX Omega Ratio Rank: 61
VIIIX Calmar Ratio Rank: 68
VIIIX Martin Ratio Rank: 79

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.

IRSVX vs. VIIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Voya Target Retirement 2055 Fund (IRSVX) 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.

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.

	IRSVX	VIIIX	Difference
Sharpe ratio: Return per unit of total volatility	2.44	2.17	+0.27
Sortino ratio: Return per unit of downside risk	3.45	2.93	+0.53
Omega ratio: Gain probability vs. loss probability	1.45	1.39	+0.06
Calmar ratio: Return relative to maximum drawdown	3.36	3.04	+0.32
Martin ratio: Return relative to average drawdown	15.67	13.74	+1.92

IRSVX vs. VIIIX - Sharpe Ratio Comparison

The current IRSVX Sharpe Ratio is 2.44, which is comparable to the VIIIX Sharpe Ratio of 2.17. The chart below compares the historical Sharpe Ratios of IRSVX 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.

Drawdowns

IRSVX vs. VIIIX - Drawdown Comparison

The maximum IRSVX drawdown since its inception was -33.36%, smaller than the maximum VIIIX drawdown of -55.18%. Use the drawdown chart below to compare losses from any high point for IRSVX and VIIIX.

Drawdown Indicators

	IRSVX	VIIIX	Difference
Max Drawdown Largest peak-to-trough decline	-33.36%	-55.18%	+21.82%
Max Drawdown (1Y) Largest decline over 1 year	-9.54%	-8.90%	-0.64%
Max Drawdown (3Y) Largest decline over 3 years	-16.04%	-18.75%	+2.71%
Max Drawdown (5Y) Largest decline over 5 years	-26.20%	-24.50%	-1.70%
Max Drawdown (10Y) Largest decline over 10 years	-33.36%	-33.79%	+0.43%
Current Drawdown Current decline from peak	-0.56%	-1.36%	+0.80%
Average Drawdown Average peak-to-trough decline	-4.51%	-10.00%	+5.49%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.97%	1.96%	+0.01%

Volatility

IRSVX vs. VIIIX - Volatility Comparison

Voya Target Retirement 2055 Fund (IRSVX) has a higher volatility of 5.03% compared to Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX) at 4.77%. This indicates that IRSVX's price experiences larger fluctuations and is considered to be riskier than VIIIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	IRSVX	VIIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.03%	4.77%	+0.26%
Volatility (6M) Calculated over the trailing 6-month period	10.75%	9.91%	+0.84%
Volatility (1Y) Calculated over the trailing 1-year period	13.12%	12.47%	+0.65%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.55%	16.99%	-1.44%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.32%	18.10%	-1.78%

IRSVX vs. VIIIX - Expense Ratio Comparison

IRSVX has a 0.24% expense ratio, which is higher than VIIIX's 0.02% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

IRSVX vs. VIIIX - Dividend Comparison

IRSVX's dividend yield for the trailing twelve months is around 10.39%, more than VIIIX's 2.44% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
IRSVX Voya Target Retirement 2055 Fund	10.39%	11.72%	3.23%	1.83%	6.02%	23.53%	2.22%	6.32%	7.08%	5.90%	1.76%	0.43%
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares	2.44%	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 IRSVX and VIIIX in my portfolio?

IRSVX and VIIIX have a correlation of 0.88, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, IRSVX or VIIIX?

IRSVX has higher volatility (5.03%) compared to VIIIX (4.77%). In terms of maximum drawdown, IRSVX dropped -33.36% vs VIIIX's -55.18%.

Which has better risk-adjusted returns?

IRSVX currently has the higher Sharpe Ratio (2.44 vs 2.17), 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.