SPIIX vs. RCKSX
Compare and contrast key facts about SEI S&P 500 Index Fund Class I (SPIIX) and Rock Oak Core Growth Fund (RCKSX).
SPIIX is a passively managed fund by SEI that tracks the performance of the S&P 500 Index. It was launched on Jun 28, 2002. RCKSX is managed by Oak Associates. It was launched on Dec 31, 2004.
Performance
SPIIX vs. RCKSX - Performance Comparison
Loading graphics...
SPIIX vs. RCKSX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
SPIIX SEI S&P 500 Index Fund Class I | -7.22% | 16.97% | 24.11% | 25.49% | -18.84% | 28.04% | 17.66% | 30.72% | -5.00% | 21.06% |
RCKSX Rock Oak Core Growth Fund | 6.05% | 12.99% | 15.12% | 15.57% | -18.09% | 9.96% | 13.75% | 19.05% | -2.14% | 22.69% |
Returns By Period
In the year-to-date period, SPIIX achieves a -7.22% return, which is significantly lower than RCKSX's 6.05% return. Over the past 10 years, SPIIX has outperformed RCKSX with an annualized return of 12.99%, while RCKSX has yielded a comparatively lower 10.21% annualized return.
SPIIX
- 1D
- -0.40%
- 1M
- -7.73%
- YTD
- -7.22%
- 6M
- -5.00%
- 1Y
- 13.56%
- 3Y*
- 16.34%
- 5Y*
- 10.62%
- 10Y*
- 12.99%
RCKSX
- 1D
- -0.32%
- 1M
- -2.56%
- YTD
- 6.05%
- 6M
- 6.54%
- 1Y
- 21.02%
- 3Y*
- 16.53%
- 5Y*
- 5.89%
- 10Y*
- 10.21%
Compare stocks, funds, or ETFs
Search for stocks, ETFs, and funds for a quick comparison or use the comparison tool for more options.
SPIIX vs. RCKSX - Expense Ratio Comparison
SPIIX has a 0.65% expense ratio, which is lower than RCKSX's 1.25% expense ratio.
Return for Risk
SPIIX vs. RCKSX — Risk / Return Rank
SPIIX
RCKSX
SPIIX vs. RCKSX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for SEI S&P 500 Index Fund Class I (SPIIX) and Rock Oak Core Growth Fund (RCKSX). 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.
| SPIIX | RCKSX | Difference | |
|---|---|---|---|
Sharpe ratioReturn per unit of total volatility | 0.79 | 1.33 | -0.54 |
Sortino ratioReturn per unit of downside risk | 1.23 | 1.96 | -0.73 |
Omega ratioGain probability vs. loss probability | 1.19 | 1.26 | -0.08 |
Calmar ratioReturn relative to maximum drawdown | 0.98 | 1.76 | -0.77 |
Martin ratioReturn relative to average drawdown | 4.73 | 9.21 | -4.48 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
Loading graphics...
Sharpe Ratios by Period
| SPIIX | RCKSX | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 0.79 | 1.33 | -0.54 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.58 | 0.38 | +0.20 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.69 | 0.58 | +0.11 |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.53 | 0.36 | +0.17 |
Correlation
The correlation between SPIIX and RCKSX is 0.87, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.
Dividends
SPIIX vs. RCKSX - Dividend Comparison
SPIIX's dividend yield for the trailing twelve months is around 9.08%, more than RCKSX's 5.90% yield.
| TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
SPIIX SEI S&P 500 Index Fund Class I | 9.08% | 8.42% | 12.20% | 4.10% | 10.27% | 7.03% | 5.78% | 4.04% | 3.90% | 2.08% | 4.34% | 1.53% |
RCKSX Rock Oak Core Growth Fund | 5.90% | 6.26% | 0.47% | 0.71% | 1.00% | 4.31% | 16.56% | 3.18% | 0.59% | 5.91% | 0.70% | 3.21% |
Drawdowns
SPIIX vs. RCKSX - Drawdown Comparison
The maximum SPIIX drawdown since its inception was -55.78%, roughly equal to the maximum RCKSX drawdown of -57.88%. Use the drawdown chart below to compare losses from any high point for SPIIX and RCKSX.
Loading graphics...
Drawdown Indicators
| SPIIX | RCKSX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -55.78% | -57.88% | +2.10% |
Max Drawdown (1Y)Largest decline over 1 year | -12.14% | -11.29% | -0.85% |
Max Drawdown (5Y)Largest decline over 5 years | -25.70% | -23.50% | -2.20% |
Max Drawdown (10Y)Largest decline over 10 years | -33.85% | -33.10% | -0.75% |
Current DrawdownCurrent decline from peak | -9.02% | -3.25% | -5.77% |
Average DrawdownAverage peak-to-trough decline | -7.33% | -9.58% | +2.25% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 2.52% | 2.15% | +0.37% |
Volatility
SPIIX vs. RCKSX - Volatility Comparison
SEI S&P 500 Index Fund Class I (SPIIX) has a higher volatility of 4.24% compared to Rock Oak Core Growth Fund (RCKSX) at 3.42%. This indicates that SPIIX's price experiences larger fluctuations and is considered to be riskier than RCKSX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
Loading graphics...
Volatility by Period
| SPIIX | RCKSX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 4.24% | 3.42% | +0.82% |
Volatility (6M)Calculated over the trailing 6-month period | 9.09% | 8.76% | +0.33% |
Volatility (1Y)Calculated over the trailing 1-year period | 18.13% | 16.37% | +1.76% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 18.41% | 15.77% | +2.64% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 18.84% | 17.58% | +1.26% |