PEOPX vs. PRBLX

Last updated Aug 1, 2026

PEOPX (BNY Mellon S&P 500 Index Fund) and PRBLX (Parnassus Core Equity Fund Investor Shares) are both mutual funds - PEOPX is a S&P 500 fund tracking the S&P 500 Index, while PRBLX is a Large Cap Blend Equities fund actively managed by Parnassus. PEOPX is passively managed, while PRBLX is actively managed. Over the past 10 years, PEOPX returned 14.33%/yr vs 13.50%/yr for PRBLX. Their correlation of 0.90 means they have usually moved in the same direction. PEOPX charges 0.50%/yr vs 0.81%/yr for PRBLX.

Performance

PEOPX vs. PRBLX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in BNY Mellon S&P 500 Index Fund (PEOPX) and Parnassus Core Equity Fund Investor Shares (PRBLX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, PEOPX achieves a 9.07% return, which is significantly higher than PRBLX's 7.76% return. Over the past 10 years, PEOPX has outperformed PRBLX with an annualized return of 14.33%, while PRBLX has yielded a comparatively lower 13.50% annualized return.

PEOPX

• 1D: 1.67%
• 1M: -0.58%
• 6M: 7.56%
• YTD: 9.07%
• 1Y: 20.11%
• 3Y*: 18.54%
• 5Y*: 12.18%
• 10Y*: 14.33%
• ALL TIME*: 8.80%

PRBLX

• 1D: 1.79%
• 1M: -0.84%
• 6M: 6.19%
• YTD: 7.76%
• 1Y: 11.73%
• 3Y*: 14.28%
• 5Y*: 9.28%
• 10Y*: 13.50%
• ALL TIME*: 11.23%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
PEOPX BNY Mellon S&P 500 Index Fund	$0.00	$0.00	$0.00
PRBLX Parnassus Core Equity Fund Investor Shares	$0.00	$0.00	$0.00

PEOPX vs. PRBLX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PEOPX BNY Mellon S&P 500 Index Fund	9.07%	17.33%	24.50%	25.78%	-18.67%	28.25%	17.83%	30.96%	-6.01%	21.26%
PRBLX Parnassus Core Equity Fund Investor Shares	7.76%	11.67%	18.58%	24.97%	-18.64%	27.59%	21.21%	30.68%	-0.30%	16.63%

Correlation

The correlation between PEOPX and PRBLX is 0.92, meaning they have usually moved in the same direction, including during past declines.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.92
Correlation (3Y) Balances recent behavior with more history.	0.93
Correlation (5Y) Shows whether the relationship held over a longer period.	0.95
Correlation (10Y) Provides a long-term view across more market conditions.	0.94
Correlation (All Time) Calculated using the full available price history since Jan 4, 1993	0.90

The correlation between PEOPX and PRBLX has been stable across timeframes, ranging from 0.90 to 0.95 - a consistent structural relationship.

Return for Risk

PEOPX vs. PRBLX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

PEOPX

PEOPX Risk / Return Rank: 59
PEOPX Sharpe Ratio Rank: 56
PEOPX Sortino Ratio Rank: 53
PEOPX Omega Ratio Rank: 54
PEOPX Calmar Ratio Rank: 59
PEOPX Martin Ratio Rank: 71

PRBLX

PRBLX Risk / Return Rank: 20
PRBLX Sharpe Ratio Rank: 20
PRBLX Sortino Ratio Rank: 20
PRBLX Omega Ratio Rank: 19
PRBLX Calmar Ratio Rank: 17
PRBLX Martin Ratio Rank: 23

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

PEOPX vs. PRBLX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for BNY Mellon S&P 500 Index Fund (PEOPX) and Parnassus Core Equity Fund Investor Shares (PRBLX). 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.

	PEOPX	PRBLX	Difference
Sharpe ratio: Return per unit of total volatility	1.39	0.71	+0.67
Sortino ratio: Return per unit of downside risk	1.94	1.07	+0.87
Omega ratio: Gain probability vs. loss probability	1.25	1.13	+0.12
Calmar ratio: Return relative to maximum drawdown	1.99	0.79	+1.20
Martin ratio: Return relative to average drawdown	8.49	3.05	+5.44

PEOPX vs. PRBLX - Sharpe Ratio Comparison

The current PEOPX Sharpe Ratio is 1.39, which is higher than the PRBLX Sharpe Ratio of 0.71. The chart below compares the historical Sharpe Ratios of PEOPX and PRBLX, 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

PEOPX vs. PRBLX - Drawdown Comparison

The maximum PEOPX drawdown since its inception was -57.45%, which is greater than PRBLX's maximum drawdown of -42.20%. Use the drawdown chart below to compare losses from any high point for PEOPX and PRBLX.

Drawdown Indicators

	PEOPX	PRBLX	Difference
Max Drawdown Largest peak-to-trough decline	-57.45%	-42.20%	-15.25%
Max Drawdown (1Y) Largest decline over 1 year	-8.97%	-11.63%	+2.66%
Max Drawdown (3Y) Largest decline over 3 years	-18.80%	-16.31%	-2.49%
Max Drawdown (5Y) Largest decline over 5 years	-24.79%	-26.31%	+1.52%
Max Drawdown (10Y) Largest decline over 10 years	-33.85%	-30.09%	-3.76%
Current Drawdown Current decline from peak	-2.18%	-1.70%	-0.48%
Average Drawdown Average peak-to-trough decline	-10.47%	-4.03%	-6.44%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.10%	3.03%	-0.93%

Volatility

PEOPX vs. PRBLX - Volatility Comparison

The current volatility for BNY Mellon S&P 500 Index Fund (PEOPX) is 3.46%, while Parnassus Core Equity Fund Investor Shares (PRBLX) has a volatility of 3.70%. This indicates that PEOPX experiences smaller price fluctuations and is considered to be less risky than PRBLX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	PEOPX	PRBLX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.46%	3.70%	-0.24%
Volatility (6M) Calculated over the trailing 6-month period	10.10%	10.38%	-0.28%
Volatility (1Y) Calculated over the trailing 1-year period	12.87%	12.90%	-0.03%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.03%	16.40%	+0.63%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.97%	17.28%	+0.69%

PEOPX vs. PRBLX - Expense Ratio Comparison

PEOPX has a 0.50% expense ratio, which is lower than PRBLX's 0.81% expense ratio.

Dividends

PEOPX vs. PRBLX - Dividend Comparison

PEOPX's dividend yield for the trailing twelve months is around 9.49%, less than PRBLX's 17.66% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PEOPX BNY Mellon S&P 500 Index Fund	9.49%	10.35%	10.38%	7.35%	11.78%	12.89%	11.94%	14.37%	14.75%	9.21%	10.90%	7.81%
PRBLX Parnassus Core Equity Fund Investor Shares	17.66%	19.08%	10.00%	6.01%	10.13%	7.77%	5.87%	8.02%	9.64%	7.16%	3.80%	9.62%

Frequently Asked Questions

Can I hold both PEOPX and PRBLX in my portfolio?

With a correlation of 0.92, PEOPX and PRBLX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, PEOPX or PRBLX?

PRBLX has higher volatility (3.70%) compared to PEOPX (3.46%). In terms of maximum drawdown, PEOPX dropped -57.45% vs PRBLX's -42.20%.

Which has better risk-adjusted returns?

PEOPX currently has the higher Sharpe Ratio (1.39 vs 0.71), 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.