IIRLX vs. POSKX

Last updated Jun 4, 2026

IIRLX (Voya Russell Large Cap Index Portfolio) and POSKX (PrimeCap Odyssey Stock Fund) are both Large Cap Blend Equities funds. Over the past 10 years, IIRLX returned 16.22%/yr vs 16.24%/yr for POSKX. Their correlation of 0.90 suggests significant overlap in exposure. IIRLX charges 0.36%/yr vs 0.65%/yr for POSKX.

Performance

IIRLX vs. POSKX - Performance Comparison

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

Returns By Period

In the year-to-date period, IIRLX achieves a 11.09% return, which is significantly lower than POSKX's 22.10% return. Both investments have delivered pretty close results over the past 10 years, with IIRLX having a 16.22% annualized return and POSKX not far ahead at 16.24%.

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%

POSKX

• 1D: 0.52%
• 1M: 9.11%
• YTD: 22.10%
• 6M: 22.48%
• 1Y: 50.17%
• 3Y*: 25.06%
• 5Y*: 15.87%
• 10Y*: 16.24%

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

IIRLX vs. POSKX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
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%
POSKX PrimeCap Odyssey Stock Fund	22.10%	25.73%	12.77%	21.18%	-11.12%	32.48%	10.13%	27.15%	-7.19%	25.99%

Correlation

The correlation between IIRLX and POSKX is 0.70, 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	0.70
Correlation (3Y) Calculated over the trailing 3-year period	0.75
Correlation (5Y) Calculated over the trailing 5-year period	0.83
Correlation (10Y) Calculated over the trailing 10-year period	0.86
Correlation (All Time) Calculated using the full available price history since Mar 12, 2008	0.90

Over the past year, the correlation between IIRLX and POSKX has dropped to 0.70 - well below their long-term average of 0.90, suggesting their price drivers have been diverging.

Return for Risk

IIRLX vs. POSKX — Risk / Return Rank

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

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

POSKX

POSKX Risk / Return Rank: 91
POSKX Sharpe Ratio Rank: 94
POSKX Sortino Ratio Rank: 91
POSKX Omega Ratio Rank: 85
POSKX Calmar Ratio Rank: 93
POSKX Martin Ratio Rank: 94

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.

IIRLX vs. POSKX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Voya Russell Large Cap Index Portfolio (IIRLX) and PrimeCap Odyssey Stock Fund (POSKX). 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.

	IIRLX	POSKX	Difference
Sharpe ratio: Return per unit of total volatility	2.53	3.25	-0.72
Sortino ratio: Return per unit of downside risk	3.54	4.48	-0.94
Omega ratio: Gain probability vs. loss probability	1.47	1.57	-0.10
Calmar ratio: Return relative to maximum drawdown	3.48	5.18	-1.70
Martin ratio: Return relative to average drawdown	14.91	21.69	-6.77
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

IIRLX vs. POSKX - Sharpe Ratio Comparison

The current IIRLX Sharpe Ratio is 2.53, which is comparable to the POSKX Sharpe Ratio of 3.25. The chart below compares the historical Sharpe Ratios of IIRLX and POSKX, 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

	IIRLX	POSKX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.53	3.25	-0.72
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.86	0.89	-0.03
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.89	0.86	+0.03
Sharpe Ratio (All Time) Calculated using the full available price history	0.62	0.67	-0.05

Drawdowns

IIRLX vs. POSKX - Drawdown Comparison

The maximum IIRLX drawdown since its inception was -50.33%, roughly equal to the maximum POSKX drawdown of -50.18%. Use the drawdown chart below to compare losses from any high point for IIRLX and POSKX.

Drawdown Indicators

	IIRLX	POSKX	Difference
Max Drawdown Largest peak-to-trough decline	-50.33%	-50.18%	-0.15%
Max Drawdown (1Y) Largest decline over 1 year	-9.83%	-9.99%	+0.16%
Max Drawdown (3Y) Largest decline over 3 years	-19.58%	-20.25%	+0.67%
Max Drawdown (5Y) Largest decline over 5 years	-25.83%	-22.96%	-2.87%
Max Drawdown (10Y) Largest decline over 10 years	-32.60%	-36.88%	+4.28%
Current Drawdown Current decline from peak	0.00%	-0.12%	+0.12%
Average Drawdown Average peak-to-trough decline	-6.78%	-6.15%	-0.63%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.18%	2.38%	-0.20%

Volatility

IIRLX vs. POSKX - Volatility Comparison

Voya Russell Large Cap Index Portfolio (IIRLX) and PrimeCap Odyssey Stock Fund (POSKX) have volatilities of 6.14% and 6.13%, 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

	IIRLX	POSKX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.14%	6.13%	+0.01%
Volatility (6M) Calculated over the trailing 6-month period	10.65%	12.66%	-2.01%
Volatility (1Y) Calculated over the trailing 1-year period	13.55%	15.92%	-2.37%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.77%	17.87%	-0.10%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.52%	19.00%	-0.48%

IIRLX vs. POSKX - Expense Ratio Comparison

IIRLX has a 0.36% expense ratio, which is lower than POSKX's 0.65% expense ratio.

Dividends

IIRLX vs. POSKX - Dividend Comparison

IIRLX's dividend yield for the trailing twelve months is around 4.76%, less than POSKX's 22.47% 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%
POSKX PrimeCap Odyssey Stock Fund	22.47%	27.44%	18.13%	10.14%	12.13%	14.58%	7.85%	6.03%	3.03%	2.17%	2.93%	1.92%

Frequently Asked Questions

Can I hold both IIRLX and POSKX in my portfolio?

IIRLX and POSKX have a correlation of 0.70, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, IIRLX or POSKX?

IIRLX has higher volatility (6.14%) compared to POSKX (6.13%). In terms of maximum drawdown, IIRLX dropped -50.33% vs POSKX's -50.18%.

Which has better risk-adjusted returns?

POSKX currently has the higher Sharpe Ratio (3.25 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.