SVSPX vs. POSKX

Last updated Jun 24, 2026

SVSPX (State Street S&P 500 Index Fund Class N) and POSKX (PrimeCap Odyssey Stock Fund) are both Large Cap Blend Equities funds. Over the past 10 years, SVSPX returned 15.65%/yr vs 17.20%/yr for POSKX. Their correlation of 0.91 suggests significant overlap in exposure. SVSPX charges 0.16%/yr vs 0.65%/yr for POSKX.

Performance

SVSPX vs. POSKX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in State Street S&P 500 Index Fund Class N (SVSPX) 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, SVSPX achieves a 9.71% return, which is significantly lower than POSKX's 26.80% return. Over the past 10 years, SVSPX has underperformed POSKX with an annualized return of 15.65%, while POSKX has yielded a comparatively higher 17.20% annualized return.

SVSPX

• 1D: -0.37%
• 1M: 0.47%
• YTD: 9.71%
• 6M: 8.71%
• 1Y: 25.50%
• 3Y*: 21.37%
• 5Y*: 13.49%
• 10Y*: 15.65%

POSKX

• 1D: 1.20%
• 1M: 6.08%
• YTD: 26.80%
• 6M: 25.51%
• 1Y: 53.32%
• 3Y*: 25.86%
• 5Y*: 16.80%
• 10Y*: 17.20%

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

SVSPX vs. POSKX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
SVSPX State Street S&P 500 Index Fund Class N	9.71%	17.83%	25.07%	26.21%	-18.31%	28.38%	18.48%	31.27%	-4.87%	21.71%
POSKX PrimeCap Odyssey Stock Fund	26.80%	25.73%	12.77%	21.18%	-11.12%	32.48%	10.13%	27.15%	-7.19%	25.99%

Correlation

The correlation between SVSPX and POSKX is 0.61, 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	0.61
Correlation (3Y) Calculated over the trailing 3-year period	0.73
Correlation (5Y) Calculated over the trailing 5-year period	0.83
Correlation (10Y) Calculated over the trailing 10-year period	0.87
Correlation (All Time) Calculated using the full available price history since Nov 2, 2004	0.91

Over the past year, the correlation between SVSPX and POSKX has dropped to 0.61 - well below their long-term average of 0.91, suggesting their price drivers have been diverging.

Return for Risk

SVSPX vs. POSKX — Risk / Return Rank

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

SVSPX

SVSPX Risk / Return Rank: 82
SVSPX Sharpe Ratio Rank: 82
SVSPX Sortino Ratio Rank: 79
SVSPX Omega Ratio Rank: 75
SVSPX Calmar Ratio Rank: 84
SVSPX Martin Ratio Rank: 91

POSKX

POSKX Risk / Return Rank: 94
POSKX Sharpe Ratio Rank: 96
POSKX Sortino Ratio Rank: 93
POSKX Omega Ratio Rank: 88
POSKX Calmar Ratio Rank: 95
POSKX Martin Ratio Rank: 96

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.

SVSPX vs. POSKX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for State Street S&P 500 Index Fund Class N (SVSPX) 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.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	SVSPX	POSKX	Difference
Sharpe ratio: Return per unit of total volatility	2.47	3.24	-0.76
Sortino ratio: Return per unit of downside risk	3.45	4.39	-0.94
Omega ratio: Gain probability vs. loss probability	1.44	1.57	-0.13
Calmar ratio: Return relative to maximum drawdown	3.70	5.47	-1.77
Martin ratio: Return relative to average drawdown	16.89	22.70	-5.81

SVSPX vs. POSKX - Sharpe Ratio Comparison

The current SVSPX Sharpe Ratio is 2.47, which is comparable to the POSKX Sharpe Ratio of 3.24. The chart below compares the historical Sharpe Ratios of SVSPX 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.

Drawdowns

SVSPX vs. POSKX - Drawdown Comparison

The maximum SVSPX drawdown since its inception was -55.76%, which is greater than POSKX's maximum drawdown of -50.18%. Use the drawdown chart below to compare losses from any high point for SVSPX and POSKX.

Drawdown Indicators

	SVSPX	POSKX	Difference
Max Drawdown Largest peak-to-trough decline	-55.76%	-50.18%	-5.58%
Max Drawdown (1Y) Largest decline over 1 year	-8.93%	-9.99%	+1.06%
Max Drawdown (3Y) Largest decline over 3 years	-19.09%	-20.25%	+1.16%
Max Drawdown (5Y) Largest decline over 5 years	-24.59%	-22.96%	-1.63%
Max Drawdown (10Y) Largest decline over 10 years	-33.69%	-36.88%	+3.19%
Current Drawdown Current decline from peak	-1.73%	0.00%	-1.73%
Average Drawdown Average peak-to-trough decline	-9.23%	-6.14%	-3.09%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.92%	2.40%	-0.48%

Volatility

SVSPX vs. POSKX - Volatility Comparison

The current volatility for State Street S&P 500 Index Fund Class N (SVSPX) is 4.84%, while PrimeCap Odyssey Stock Fund (POSKX) has a volatility of 6.72%. This indicates that SVSPX experiences smaller price fluctuations and is considered to be less risky than POSKX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SVSPX	POSKX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.84%	6.72%	-1.88%
Volatility (6M) Calculated over the trailing 6-month period	10.68%	13.83%	-3.15%
Volatility (1Y) Calculated over the trailing 1-year period	13.40%	16.94%	-3.54%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.54%	18.05%	-0.51%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.39%	19.09%	-0.70%

SVSPX vs. POSKX - Expense Ratio Comparison

SVSPX has a 0.16% expense ratio, which is lower than POSKX's 0.65% expense ratio.

Dividends

SVSPX vs. POSKX - Dividend Comparison

SVSPX's dividend yield for the trailing twelve months is around 7.31%, less than POSKX's 21.64% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
POSKX PrimeCap Odyssey Stock Fund	21.64%	27.44%	18.13%	10.14%	12.13%	14.58%	7.85%	6.03%	3.03%	2.17%	2.93%	1.92%
SVSPX State Street S&P 500 Index Fund Class N	7.31%	8.28%	9.39%	12.38%	10.53%	11.65%	15.98%	6.40%	13.29%	4.94%	8.63%	4.05%

Frequently Asked Questions

Can I hold both SVSPX and POSKX in my portfolio?

SVSPX and POSKX have a correlation of 0.61, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, SVSPX or POSKX?

POSKX has higher volatility (6.72%) compared to SVSPX (4.84%). In terms of maximum drawdown, SVSPX dropped -55.76% vs POSKX's -50.18%.

Which has better risk-adjusted returns?

POSKX currently has the higher Sharpe Ratio (3.23 vs 2.47), 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.