POGRX vs. BSPIX

Last updated Jun 4, 2026

POGRX (PrimeCap Odyssey Growth Fund) and BSPIX (iShares S&P 500 Index Fund Institutional Class) are both mutual funds - POGRX is a Large Cap Growth Equities fund managed by PRIMECAP Odyssey Funds, while BSPIX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, POGRX returned 17.39%/yr vs 15.46%/yr for BSPIX. Their correlation of 0.89 suggests significant overlap in exposure. POGRX charges 0.65%/yr vs 0.10%/yr for BSPIX.

Performance

POGRX vs. BSPIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in PrimeCap Odyssey Growth Fund (POGRX) and iShares S&P 500 Index Fund Institutional Class (BSPIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, POGRX achieves a 26.45% return, which is significantly higher than BSPIX's 11.65% return. Over the past 10 years, POGRX has outperformed BSPIX with an annualized return of 17.39%, while BSPIX has yielded a comparatively lower 15.46% annualized return.

POGRX

• 1D: -0.02%
• 1M: 15.42%
• YTD: 26.45%
• 6M: 27.81%
• 1Y: 64.17%
• 3Y*: 29.06%
• 5Y*: 16.04%
• 10Y*: 17.39%

BSPIX

• 1D: 0.13%
• 1M: 5.79%
• YTD: 11.65%
• 6M: 11.68%
• 1Y: 28.84%
• 3Y*: 22.63%
• 5Y*: 14.17%
• 10Y*: 15.46%

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

POGRX vs. BSPIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
POGRX PrimeCap Odyssey Growth Fund	26.45%	32.99%	13.09%	23.85%	-14.61%	18.81%	17.05%	23.98%	-4.56%	32.07%
BSPIX iShares S&P 500 Index Fund Institutional Class	11.65%	17.75%	24.85%	26.17%	-18.20%	28.55%	18.35%	31.35%	-4.87%	21.20%

Correlation

The correlation between POGRX and BSPIX is 0.84, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.84
Correlation (3Y) Calculated over the trailing 3-year period	0.87
Correlation (5Y) Calculated over the trailing 5-year period	0.90
Correlation (10Y) Calculated over the trailing 10-year period	0.89
Correlation (All Time) Calculated using the full available price history since Jan 3, 2014	0.89

The correlation between POGRX and BSPIX has been stable across timeframes, ranging from 0.84 to 0.90 - a consistent structural relationship.

Return for Risk

POGRX vs. BSPIX — Risk / Return Rank

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

POGRX

POGRX Risk / Return Rank: 93
POGRX Sharpe Ratio Rank: 97
POGRX Sortino Ratio Rank: 94
POGRX Omega Ratio Rank: 90
POGRX Calmar Ratio Rank: 90
POGRX Martin Ratio Rank: 92

BSPIX

BSPIX Risk / Return Rank: 73
BSPIX Sharpe Ratio Rank: 74
BSPIX Sortino Ratio Rank: 67
BSPIX Omega Ratio Rank: 67
BSPIX Calmar Ratio Rank: 74
BSPIX Martin Ratio Rank: 83

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.

POGRX vs. BSPIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for PrimeCap Odyssey Growth Fund (POGRX) and iShares S&P 500 Index Fund Institutional Class (BSPIX). 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.

	POGRX	BSPIX	Difference
Sharpe ratio: Return per unit of total volatility	3.69	2.51	+1.18
Sortino ratio: Return per unit of downside risk	4.84	3.41	+1.43
Omega ratio: Gain probability vs. loss probability	1.65	1.46	+0.19
Calmar ratio: Return relative to maximum drawdown	4.60	3.34	+1.26
Martin ratio: Return relative to average drawdown	19.58	15.58	+4.00
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

POGRX vs. BSPIX - Sharpe Ratio Comparison

The current POGRX Sharpe Ratio is 3.69, which is higher than the BSPIX Sharpe Ratio of 2.51. The chart below compares the historical Sharpe Ratios of POGRX and BSPIX, 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

	POGRX	BSPIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.69	2.51	+1.18
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.82	0.84	-0.02
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.85	0.86	-0.01
Sharpe Ratio (All Time) Calculated using the full available price history	0.66	0.81	-0.15

Drawdowns

POGRX vs. BSPIX - Drawdown Comparison

The maximum POGRX drawdown since its inception was -51.63%, which is greater than BSPIX's maximum drawdown of -33.75%. Use the drawdown chart below to compare losses from any high point for POGRX and BSPIX.

Drawdown Indicators

	POGRX	BSPIX	Difference
Max Drawdown Largest peak-to-trough decline	-51.63%	-33.75%	-17.88%
Max Drawdown (1Y) Largest decline over 1 year	-14.40%	-8.91%	-5.49%
Max Drawdown (3Y) Largest decline over 3 years	-22.13%	-18.74%	-3.39%
Max Drawdown (5Y) Largest decline over 5 years	-26.85%	-24.55%	-2.30%
Max Drawdown (10Y) Largest decline over 10 years	-35.29%	-33.75%	-1.54%
Current Drawdown Current decline from peak	-0.02%	0.00%	-0.02%
Average Drawdown Average peak-to-trough decline	-7.13%	-3.93%	-3.20%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.37%	1.90%	+1.47%

Volatility

POGRX vs. BSPIX - Volatility Comparison

PrimeCap Odyssey Growth Fund (POGRX) has a higher volatility of 7.05% compared to iShares S&P 500 Index Fund Institutional Class (BSPIX) at 2.83%. This indicates that POGRX's price experiences larger fluctuations and is considered to be riskier than BSPIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	POGRX	BSPIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.05%	2.83%	+4.22%
Volatility (6M) Calculated over the trailing 6-month period	14.59%	8.97%	+5.62%
Volatility (1Y) Calculated over the trailing 1-year period	17.96%	11.85%	+6.11%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.60%	16.88%	+2.72%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.47%	18.03%	+2.44%

POGRX vs. BSPIX - Expense Ratio Comparison

POGRX has a 0.65% expense ratio, which is higher than BSPIX's 0.10% expense ratio.

Dividends

POGRX vs. BSPIX - Dividend Comparison

POGRX's dividend yield for the trailing twelve months is around 19.68%, more than BSPIX's 1.50% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BSPIX iShares S&P 500 Index Fund Institutional Class	1.50%	1.66%	1.35%	1.44%	1.94%	1.76%	1.60%	1.92%	1.94%	1.57%	2.30%	2.42%
POGRX PrimeCap Odyssey Growth Fund	19.68%	24.89%	20.79%	13.28%	12.36%	13.68%	12.50%	5.13%	2.45%	1.54%	5.83%	1.29%

Frequently Asked Questions

Can I hold both POGRX and BSPIX in my portfolio?

POGRX and BSPIX have a correlation of 0.84, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, POGRX or BSPIX?

POGRX has higher volatility (7.05%) compared to BSPIX (2.83%). In terms of maximum drawdown, POGRX dropped -51.63% vs BSPIX's -33.75%.

Which has better risk-adjusted returns?

POGRX currently has the higher Sharpe Ratio (3.69 vs 2.51), 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.