ISOLX vs. IIRLX

Last updated Jun 3, 2026

ISOLX (Voya Target In-Retirement Fund) and IIRLX (Voya Russell Large Cap Index Portfolio) are both mutual funds - ISOLX is a Target Retirement Date fund managed by Voya, while IIRLX is a Large Cap Blend Equities fund managed by Voya. Over the past 10 years, ISOLX returned 5.64%/yr vs 16.22%/yr for IIRLX. A 0.80 correlation means they provide meaningful diversification when combined. ISOLX charges 0.20%/yr vs 0.36%/yr for IIRLX.

Performance

ISOLX vs. IIRLX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Voya Target In-Retirement Fund (ISOLX) and Voya Russell Large Cap Index Portfolio (IIRLX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, ISOLX achieves a 5.11% return, which is significantly lower than IIRLX's 11.09% return. Over the past 10 years, ISOLX has underperformed IIRLX with an annualized return of 5.64%, while IIRLX has yielded a comparatively higher 16.22% annualized return.

ISOLX

• 1D: 0.08%
• 1M: 1.88%
• YTD: 5.11%
• 6M: 5.63%
• 1Y: 13.90%
• 3Y*: 10.13%
• 5Y*: 4.23%
• 10Y*: 5.64%

IIRLX

• 1D: 0.06%
• 1M: 6.31%
• YTD: 11.09%
• 6M: 11.05%
• 1Y: 29.54%
• 3Y*: 23.56%
• 5Y*: 14.81%
• 10Y*: 16.22%

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

ISOLX vs. IIRLX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ISOLX Voya Target In-Retirement Fund	5.11%	11.96%	7.03%	11.13%	-14.97%	6.53%	10.46%	14.40%	-2.96%	9.49%
IIRLX Voya Russell Large Cap Index Portfolio	11.09%	18.77%	26.95%	29.41%	-20.07%	27.26%	21.71%	31.18%	-3.45%	22.58%

Correlation

The correlation between ISOLX and IIRLX is 0.69, 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	0.69
Correlation (3Y) Calculated over the trailing 3-year period	0.69
Correlation (5Y) Calculated over the trailing 5-year period	0.74
Correlation (10Y) Calculated over the trailing 10-year period	0.78
Correlation (All Time) Calculated using the full available price history since Dec 26, 2012	0.80

The correlation between ISOLX and IIRLX shifts across timeframes, from 0.69 (1 year) to 0.80 (all time), reflecting how their relationship changes across market environments.

Return for Risk

ISOLX vs. IIRLX — Risk / Return Rank

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

ISOLX

ISOLX Risk / Return Rank: 84
ISOLX Sharpe Ratio Rank: 85
ISOLX Sortino Ratio Rank: 88
ISOLX Omega Ratio Rank: 82
ISOLX Calmar Ratio Rank: 78
ISOLX Martin Ratio Rank: 86

IIRLX

IIRLX Risk / Return Rank: 75
IIRLX Sharpe Ratio Rank: 76
IIRLX Sortino Ratio Rank: 72
IIRLX Omega Ratio Rank: 71
IIRLX Calmar Ratio Rank: 77
IIRLX 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.

ISOLX vs. IIRLX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Voya Target In-Retirement Fund (ISOLX) and Voya Russell Large Cap Index Portfolio (IIRLX). 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.

	ISOLX	IIRLX	Difference
Sharpe ratio Return per unit of total volatility	2.74	2.53	+0.21
Sortino ratio Return per unit of downside risk	4.23	3.54	+0.69
Omega ratio Gain probability vs. loss probability	1.54	1.47	+0.07
Calmar ratio Return relative to maximum drawdown	3.53	3.48	+0.05
Martin ratio Return relative to average drawdown	16.70	14.91	+1.79
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

ISOLX vs. IIRLX - Sharpe Ratio Comparison

The current ISOLX Sharpe Ratio is 2.74, which is comparable to the IIRLX Sharpe Ratio of 2.53. The chart below compares the historical Sharpe Ratios of ISOLX and IIRLX, 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

	ISOLX	IIRLX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.74	2.53	+0.21
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.61	0.86	-0.25
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.87	0.89	-0.02
Sharpe Ratio (All Time) Calculated using the full available price history	0.90	0.62	+0.28

Drawdowns

ISOLX vs. IIRLX - Drawdown Comparison

The maximum ISOLX drawdown since its inception was -19.02%, smaller than the maximum IIRLX drawdown of -50.33%. Use the drawdown chart below to compare losses from any high point for ISOLX and IIRLX.

Drawdown Indicators

	ISOLX	IIRLX	Difference
Max Drawdown Largest peak-to-trough decline	-19.02%	-50.33%	+31.31%
Max Drawdown (1Y) Largest decline over 1 year	-4.54%	-9.83%	+5.29%
Max Drawdown (3Y) Largest decline over 3 years	-6.37%	-19.58%	+13.21%
Max Drawdown (5Y) Largest decline over 5 years	-19.02%	-25.83%	+6.81%
Max Drawdown (10Y) Largest decline over 10 years	-19.02%	-32.60%	+13.58%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-2.82%	-6.78%	+3.96%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.96%	2.18%	-1.22%

Volatility

ISOLX vs. IIRLX - Volatility Comparison

The current volatility for Voya Target In-Retirement Fund (ISOLX) is 2.03%, while Voya Russell Large Cap Index Portfolio (IIRLX) has a volatility of 6.14%. This indicates that ISOLX experiences smaller price fluctuations and is considered to be less risky than IIRLX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ISOLX	IIRLX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.03%	6.14%	-4.11%
Volatility (6M) Calculated over the trailing 6-month period	4.51%	10.65%	-6.14%
Volatility (1Y) Calculated over the trailing 1-year period	5.60%	13.55%	-7.95%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	7.02%	17.77%	-10.75%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	6.58%	18.52%	-11.94%

ISOLX vs. IIRLX - Expense Ratio Comparison

ISOLX has a 0.20% expense ratio, which is lower than IIRLX's 0.36% expense ratio.

Dividends

ISOLX vs. IIRLX - Dividend Comparison

ISOLX's dividend yield for the trailing twelve months is around 3.70%, less than IIRLX's 4.76% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
IIRLX Voya Russell Large Cap Index Portfolio	4.76%	3.76%	0.96%	1.14%	5.04%	4.77%	4.71%	4.35%	1.73%	1.47%	1.77%	1.66%
ISOLX Voya Target In-Retirement Fund	3.70%	3.89%	2.37%	3.10%	3.50%	10.09%	3.54%	6.63%	3.53%	4.60%	2.06%	0.30%

Frequently Asked Questions

Can I hold both ISOLX and IIRLX in my portfolio?

ISOLX and IIRLX have a correlation of 0.69, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, ISOLX or IIRLX?

IIRLX has higher volatility (6.14%) compared to ISOLX (2.03%). In terms of maximum drawdown, ISOLX dropped -19.02% vs IIRLX's -50.33%.

Which has better risk-adjusted returns?

ISOLX currently has the higher Sharpe Ratio (2.74 vs 2.53), 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.