IIRSX vs. WWSIX

Last updated Jun 4, 2026

IIRSX (Voya Russell Small Cap Index Portfolio) and WWSIX (Keeley Small Cap Fund Class Institutional) are both Small Cap Blend Equities funds. Over the past 10 years, IIRSX returned 10.91%/yr vs 14.69%/yr for WWSIX. Their correlation of 0.92 suggests significant overlap in exposure. IIRSX charges 0.45%/yr vs 1.00%/yr for WWSIX.

Performance

IIRSX vs. WWSIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Voya Russell Small Cap Index Portfolio (IIRSX) and Keeley Small Cap Fund Class Institutional (WWSIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, IIRSX achieves a 19.90% return, which is significantly lower than WWSIX's 26.69% return. Over the past 10 years, IIRSX has underperformed WWSIX with an annualized return of 10.91%, while WWSIX has yielded a comparatively higher 14.69% annualized return.

IIRSX

• 1D: 0.92%
• 1M: 6.10%
• YTD: 19.90%
• 6M: 18.62%
• 1Y: 42.59%
• 3Y*: 18.82%
• 5Y*: 6.61%
• 10Y*: 10.91%

WWSIX

• 1D: 1.16%
• 1M: 4.17%
• YTD: 26.69%
• 6M: 27.09%
• 1Y: 60.23%
• 3Y*: 24.00%
• 5Y*: 11.84%
• 10Y*: 14.69%

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

IIRSX vs. WWSIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
IIRSX Voya Russell Small Cap Index Portfolio	19.90%	12.84%	11.14%	16.61%	-20.58%	14.32%	19.15%	24.63%	-11.26%	14.32%
WWSIX Keeley Small Cap Fund Class Institutional	26.69%	17.55%	15.79%	12.87%	-12.30%	30.04%	11.27%	28.74%	-13.49%	16.07%

Correlation

The correlation between IIRSX and WWSIX is 0.78, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.78
Correlation (3Y) Calculated over the trailing 3-year period	0.86
Correlation (5Y) Calculated over the trailing 5-year period	0.90
Correlation (10Y) Calculated over the trailing 10-year period	0.92
Correlation (All Time) Calculated using the full available price history since Jan 14, 2008	0.92

The correlation between IIRSX and WWSIX shifts across timeframes, from 0.78 (1 year) to 0.92 (all time), reflecting how their relationship changes across market environments.

Return for Risk

IIRSX vs. WWSIX — Risk / Return Rank

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

IIRSX

IIRSX Risk / Return Rank: 68
IIRSX Sharpe Ratio Rank: 61
IIRSX Sortino Ratio Rank: 54
IIRSX Omega Ratio Rank: 54
IIRSX Calmar Ratio Rank: 90
IIRSX Martin Ratio Rank: 84

WWSIX

WWSIX Risk / Return Rank: 89
WWSIX Sharpe Ratio Rank: 91
WWSIX Sortino Ratio Rank: 84
WWSIX Omega Ratio Rank: 79
WWSIX Calmar Ratio Rank: 96
WWSIX Martin Ratio Rank: 95

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.

IIRSX vs. WWSIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Voya Russell Small Cap Index Portfolio (IIRSX) and Keeley Small Cap Fund Class Institutional (WWSIX). 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.

	IIRSX	WWSIX	Difference
Sharpe ratio: Return per unit of total volatility	2.30	3.10	-0.79
Sortino ratio: Return per unit of downside risk	3.10	4.05	-0.94
Omega ratio: Gain probability vs. loss probability	1.41	1.53	-0.12
Calmar ratio: Return relative to maximum drawdown	4.61	6.30	-1.69
Martin ratio: Return relative to average drawdown	15.85	22.98	-7.13
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

IIRSX vs. WWSIX - Sharpe Ratio Comparison

The current IIRSX Sharpe Ratio is 2.30, which is comparable to the WWSIX Sharpe Ratio of 3.10. The chart below compares the historical Sharpe Ratios of IIRSX and WWSIX, 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

	IIRSX	WWSIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.30	3.10	-0.79
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.29	0.55	-0.26
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.46	0.62	-0.16
Sharpe Ratio (All Time) Calculated using the full available price history	0.28	0.44	-0.16

Drawdowns

IIRSX vs. WWSIX - Drawdown Comparison

The maximum IIRSX drawdown since its inception was -63.18%, which is greater than WWSIX's maximum drawdown of -59.71%. Use the drawdown chart below to compare losses from any high point for IIRSX and WWSIX.

Drawdown Indicators

	IIRSX	WWSIX	Difference
Max Drawdown Largest peak-to-trough decline	-63.18%	-59.71%	-3.47%
Max Drawdown (1Y) Largest decline over 1 year	-11.08%	-10.17%	-0.91%
Max Drawdown (3Y) Largest decline over 3 years	-27.95%	-26.17%	-1.78%
Max Drawdown (5Y) Largest decline over 5 years	-32.01%	-26.17%	-5.84%
Max Drawdown (10Y) Largest decline over 10 years	-42.32%	-45.11%	+2.79%
Current Drawdown Current decline from peak	-0.14%	-0.34%	+0.20%
Average Drawdown Average peak-to-trough decline	-11.43%	-8.96%	-2.47%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.08%	2.78%	+0.30%

Volatility

IIRSX vs. WWSIX - Volatility Comparison

Voya Russell Small Cap Index Portfolio (IIRSX) has a higher volatility of 12.22% compared to Keeley Small Cap Fund Class Institutional (WWSIX) at 5.21%. This indicates that IIRSX's price experiences larger fluctuations and is considered to be riskier than WWSIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	IIRSX	WWSIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	12.22%	5.21%	+7.01%
Volatility (6M) Calculated over the trailing 6-month period	17.34%	13.81%	+3.53%
Volatility (1Y) Calculated over the trailing 1-year period	22.20%	20.70%	+1.50%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.60%	21.65%	+1.95%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.96%	23.72%	+0.24%

IIRSX vs. WWSIX - Expense Ratio Comparison

IIRSX has a 0.45% expense ratio, which is lower than WWSIX's 1.00% expense ratio.

Dividends

IIRSX vs. WWSIX - Dividend Comparison

IIRSX's dividend yield for the trailing twelve months is around 14.17%, more than WWSIX's 6.09% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
IIRSX Voya Russell Small Cap Index Portfolio	14.17%	12.31%	7.55%	5.71%	11.02%	0.61%	6.29%	12.33%	8.34%	7.95%	12.75%	11.26%
WWSIX Keeley Small Cap Fund Class Institutional	6.09%	7.72%	28.12%	3.00%	1.85%	5.58%	0.20%	4.70%	14.34%	8.83%	9.05%	18.47%

Frequently Asked Questions

Can I hold both IIRSX and WWSIX in my portfolio?

IIRSX and WWSIX have a correlation of 0.78, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, IIRSX or WWSIX?

IIRSX has higher volatility (12.22%) compared to WWSIX (5.21%). In terms of maximum drawdown, IIRSX dropped -63.18% vs WWSIX's -59.71%.

Which has better risk-adjusted returns?

WWSIX currently has the higher Sharpe Ratio (3.10 vs 2.30), 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.