POSKX vs. VFFSX
Compare and contrast key facts about PrimeCap Odyssey Stock Fund (POSKX) and Vanguard 500 Index Fund Institutional Select Shares (VFFSX).
POSKX is managed by PRIMECAP Odyssey Funds. It was launched on Nov 1, 2004. VFFSX is managed by Vanguard.
Performance
POSKX vs. VFFSX - Performance Comparison
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POSKX vs. VFFSX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
POSKX PrimeCap Odyssey Stock Fund | 1.27% | 25.73% | 12.77% | 21.18% | -11.12% | 32.48% | 10.13% | 27.15% | -7.19% | 25.12% |
VFFSX Vanguard 500 Index Fund Institutional Select Shares | -4.34% | 17.87% | 25.00% | 26.28% | -18.14% | 29.24% | 18.35% | 31.88% | -4.42% | 20.80% |
Returns By Period
In the year-to-date period, POSKX achieves a 1.27% return, which is significantly higher than VFFSX's -4.34% return.
POSKX
- 1D
- 3.29%
- 1M
- -5.41%
- YTD
- 1.27%
- 6M
- 7.42%
- 1Y
- 31.27%
- 3Y*
- 18.84%
- 5Y*
- 12.41%
- 10Y*
- 14.21%
VFFSX
- 1D
- 2.92%
- 1M
- -5.03%
- YTD
- -4.34%
- 6M
- -2.14%
- 1Y
- 17.34%
- 3Y*
- 18.30%
- 5Y*
- 11.78%
- 10Y*
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POSKX vs. VFFSX - Expense Ratio Comparison
POSKX has a 0.65% expense ratio, which is higher than VFFSX's 0.01% expense ratio.
Return for Risk
POSKX vs. VFFSX — Risk / Return Rank
POSKX
VFFSX
POSKX vs. VFFSX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for PrimeCap Odyssey Stock Fund (POSKX) and Vanguard 500 Index Fund Institutional Select Shares (VFFSX). 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 | VFFSX | Difference | |
|---|---|---|---|
Sharpe ratioReturn per unit of total volatility | 1.50 | 0.98 | +0.52 |
Sortino ratioReturn per unit of downside risk | 2.12 | 1.49 | +0.63 |
Omega ratioGain probability vs. loss probability | 1.31 | 1.23 | +0.08 |
Calmar ratioReturn relative to maximum drawdown | 2.33 | 1.52 | +0.81 |
Martin ratioReturn relative to average drawdown | 10.01 | 7.31 | +2.70 |
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 | VFFSX | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.50 | 0.98 | +0.52 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.71 | 0.70 | +0.01 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.75 | — | — |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.62 | 0.77 | -0.15 |
Correlation
The correlation between POSKX and VFFSX is 0.91, 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. VFFSX - Dividend Comparison
POSKX's dividend yield for the trailing twelve months is around 27.09%, more than VFFSX's 1.21% yield.
| TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
POSKX PrimeCap Odyssey Stock Fund | 27.09% | 27.44% | 18.13% | 10.14% | 12.13% | 14.58% | 7.85% | 6.03% | 3.03% | 2.17% | 2.93% | 1.92% |
VFFSX Vanguard 500 Index Fund Institutional Select Shares | 1.21% | 1.14% | 1.24% | 1.46% | 1.70% | 1.61% | 1.56% | 2.15% | 2.09% | 1.81% | 0.00% | 0.00% |
Drawdowns
POSKX vs. VFFSX - Drawdown Comparison
The maximum POSKX drawdown since its inception was -50.18%, which is greater than VFFSX's maximum drawdown of -33.82%. Use the drawdown chart below to compare losses from any high point for POSKX and VFFSX.
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Drawdown Indicators
| POSKX | VFFSX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -50.18% | -33.82% | -16.36% |
Max Drawdown (1Y)Largest decline over 1 year | -13.30% | -12.12% | -1.18% |
Max Drawdown (5Y)Largest decline over 5 years | -22.96% | -24.51% | +1.55% |
Max Drawdown (10Y)Largest decline over 10 years | -36.88% | — | — |
Current DrawdownCurrent decline from peak | -7.03% | -6.24% | -0.79% |
Average DrawdownAverage peak-to-trough decline | -6.19% | -4.57% | -1.62% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 3.10% | 2.52% | +0.58% |
Volatility
POSKX vs. VFFSX - Volatility Comparison
PrimeCap Odyssey Stock Fund (POSKX) has a higher volatility of 6.79% compared to Vanguard 500 Index Fund Institutional Select Shares (VFFSX) at 5.35%. This indicates that POSKX's price experiences larger fluctuations and is considered to be riskier than VFFSX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| POSKX | VFFSX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 6.79% | 5.35% | +1.44% |
Volatility (6M)Calculated over the trailing 6-month period | 12.03% | 9.53% | +2.50% |
Volatility (1Y)Calculated over the trailing 1-year period | 20.58% | 18.32% | +2.26% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 17.66% | 16.91% | +0.75% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 18.88% | 18.52% | +0.36% |