POSKX vs. SPY
Compare and contrast key facts about PrimeCap Odyssey Stock Fund (POSKX) and State Street SPDR S&P 500 ETF (SPY).
POSKX is managed by PRIMECAP Odyssey Funds. It was launched on Nov 1, 2004. SPY is a passively managed fund by State Street that tracks the performance of the S&P 500 Index. It was launched on Jan 22, 1993.
Performance
POSKX vs. SPY - Performance Comparison
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POSKX vs. SPY - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
POSKX PrimeCap Odyssey Stock Fund | -1.96% | 25.73% | 12.77% | 21.18% | -11.12% | 32.48% | 10.13% | 27.15% | -7.19% | 25.99% |
SPY State Street SPDR S&P 500 ETF | -4.37% | 17.72% | 24.89% | 26.18% | -18.18% | 28.73% | 18.33% | 31.22% | -4.57% | 21.71% |
Returns By Period
In the year-to-date period, POSKX achieves a -1.96% return, which is significantly higher than SPY's -4.37% return. Both investments have delivered pretty close results over the past 10 years, with POSKX having a 13.84% annualized return and SPY not far ahead at 13.98%.
POSKX
- 1D
- -0.97%
- 1M
- -9.01%
- YTD
- -1.96%
- 6M
- 5.91%
- 1Y
- 26.50%
- 3Y*
- 17.57%
- 5Y*
- 11.90%
- 10Y*
- 13.84%
SPY
- 1D
- 2.91%
- 1M
- -4.94%
- YTD
- -4.37%
- 6M
- -1.82%
- 1Y
- 17.59%
- 3Y*
- 18.19%
- 5Y*
- 11.69%
- 10Y*
- 13.98%
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POSKX vs. SPY - Expense Ratio Comparison
POSKX has a 0.65% expense ratio, which is higher than SPY's 0.09% expense ratio.
Return for Risk
POSKX vs. SPY — Risk / Return Rank
POSKX
SPY
POSKX vs. SPY - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for PrimeCap Odyssey Stock Fund (POSKX) and State Street SPDR S&P 500 ETF (SPY). 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.
| POSKX | SPY | Difference | |
|---|---|---|---|
Sharpe ratioReturn per unit of total volatility | 1.32 | 0.93 | +0.40 |
Sortino ratioReturn per unit of downside risk | 1.90 | 1.45 | +0.45 |
Omega ratioGain probability vs. loss probability | 1.27 | 1.22 | +0.05 |
Calmar ratioReturn relative to maximum drawdown | 1.84 | 1.53 | +0.32 |
Martin ratioReturn relative to average drawdown | 8.00 | 7.30 | +0.71 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
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Sharpe Ratios by Period
| POSKX | SPY | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.32 | 0.93 | +0.40 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.68 | 0.69 | -0.01 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.74 | 0.78 | -0.05 |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.61 | 0.56 | +0.05 |
Correlation
The correlation between POSKX and SPY is 0.93, 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
POSKX vs. SPY - Dividend Comparison
POSKX's dividend yield for the trailing twelve months is around 27.99%, more than SPY's 1.14% yield.
| TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
POSKX PrimeCap Odyssey Stock Fund | 27.99% | 27.44% | 18.13% | 10.14% | 12.13% | 14.58% | 7.85% | 6.03% | 3.03% | 2.17% | 2.93% | 1.92% |
SPY State Street SPDR S&P 500 ETF | 1.14% | 1.07% | 1.21% | 1.40% | 1.65% | 1.20% | 1.52% | 1.75% | 2.04% | 1.80% | 2.03% | 2.06% |
Drawdowns
POSKX vs. SPY - Drawdown Comparison
The maximum POSKX drawdown since its inception was -50.18%, smaller than the maximum SPY drawdown of -55.19%. Use the drawdown chart below to compare losses from any high point for POSKX and SPY.
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Drawdown Indicators
| POSKX | SPY | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -50.18% | -55.19% | +5.01% |
Max Drawdown (1Y)Largest decline over 1 year | -13.30% | -12.05% | -1.25% |
Max Drawdown (5Y)Largest decline over 5 years | -22.96% | -24.50% | +1.54% |
Max Drawdown (10Y)Largest decline over 10 years | -36.88% | -33.72% | -3.16% |
Current DrawdownCurrent decline from peak | -9.99% | -6.24% | -3.75% |
Average DrawdownAverage peak-to-trough decline | -6.19% | -9.09% | +2.90% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 3.06% | 2.52% | +0.54% |
Volatility
POSKX vs. SPY - Volatility Comparison
PrimeCap Odyssey Stock Fund (POSKX) has a higher volatility of 5.71% compared to State Street SPDR S&P 500 ETF (SPY) at 5.31%. This indicates that POSKX's price experiences larger fluctuations and is considered to be riskier than SPY based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| POSKX | SPY | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 5.71% | 5.31% | +0.40% |
Volatility (6M)Calculated over the trailing 6-month period | 11.60% | 9.47% | +2.13% |
Volatility (1Y)Calculated over the trailing 1-year period | 20.38% | 19.05% | +1.33% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 17.60% | 17.06% | +0.54% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 18.86% | 17.92% | +0.94% |