USBOX vs. PRBLX

Last updated Aug 1, 2026

USBOX (Pear Tree Quality Fund) and PRBLX (Parnassus Core Equity Fund Investor Shares) are both mutual funds - USBOX is a Quality Factor fund managed by Pear Tree Funds, while PRBLX is a Large Cap Blend Equities fund actively managed by Parnassus. Over the past 10 years, USBOX returned 13.42%/yr vs 13.50%/yr for PRBLX. Their correlation of 0.86 means they have usually moved in the same direction. USBOX charges 1.16%/yr vs 0.81%/yr for PRBLX.

Performance

USBOX vs. PRBLX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Pear Tree Quality Fund (USBOX) 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, USBOX achieves a 6.62% return, which is significantly lower than PRBLX's 7.76% return. Both investments have delivered pretty close results over the past 10 years, with USBOX having a 13.42% annualized return and PRBLX not far ahead at 13.50%.

USBOX

• 1D: 1.37%
• 1M: -0.09%
• 6M: 4.85%
• YTD: 6.62%
• 1Y: 19.75%
• 3Y*: 14.89%
• 5Y*: 8.82%
• 10Y*: 13.42%
• ALL TIME*: 8.62%

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)
PRBLX Parnassus Core Equity Fund Investor Shares	$0.00	$0.00	$0.00
USBOX Pear Tree Quality Fund	$0.00	$0.00	$0.00

USBOX vs. PRBLX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
USBOX Pear Tree Quality Fund	6.62%	15.77%	17.99%	29.20%	-16.25%	16.50%	18.06%	31.18%	-1.97%	28.49%
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 USBOX and PRBLX is 0.87, 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.	0.87
Correlation (3Y) Balances recent behavior with more history.	0.88
Correlation (5Y) Shows whether the relationship held over a longer period.	0.91
Correlation (10Y) Provides a long-term view across more market conditions.	0.91
Correlation (All Time) Calculated using the full available price history since Jan 4, 1993	0.86

The correlation between USBOX and PRBLX has been stable across timeframes, ranging from 0.86 to 0.91 - a consistent structural relationship.

Return for Risk

USBOX vs. PRBLX — Risk / Return Rank

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

USBOX

USBOX Risk / Return Rank: 42
USBOX Sharpe Ratio Rank: 49
USBOX Sortino Ratio Rank: 49
USBOX Omega Ratio Rank: 44
USBOX Calmar Ratio Rank: 31
USBOX Martin Ratio Rank: 36

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.

USBOX vs. PRBLX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Pear Tree Quality Fund (USBOX) 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.

	USBOX	PRBLX	Difference
Sharpe ratio: Return per unit of total volatility	1.33	0.71	+0.61
Sortino ratio: Return per unit of downside risk	1.90	1.07	+0.82
Omega ratio: Gain probability vs. loss probability	1.23	1.13	+0.10
Calmar ratio: Return relative to maximum drawdown	1.36	0.79	+0.57
Martin ratio: Return relative to average drawdown	5.31	3.05	+2.26

USBOX vs. PRBLX - Sharpe Ratio Comparison

The current USBOX Sharpe Ratio is 1.33, which is higher than the PRBLX Sharpe Ratio of 0.71. The chart below compares the historical Sharpe Ratios of USBOX 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

USBOX vs. PRBLX - Drawdown Comparison

The maximum USBOX drawdown since its inception was -65.67%, which is greater than PRBLX's maximum drawdown of -42.20%. Use the drawdown chart below to compare losses from any high point for USBOX and PRBLX.

Drawdown Indicators

	USBOX	PRBLX	Difference
Max Drawdown Largest peak-to-trough decline	-65.67%	-42.20%	-23.47%
Max Drawdown (1Y) Largest decline over 1 year	-12.76%	-11.63%	-1.13%
Max Drawdown (3Y) Largest decline over 3 years	-15.41%	-16.31%	+0.90%
Max Drawdown (5Y) Largest decline over 5 years	-30.42%	-26.31%	-4.11%
Max Drawdown (10Y) Largest decline over 10 years	-30.42%	-30.09%	-0.33%
Current Drawdown Current decline from peak	-0.46%	-1.70%	+1.24%
Average Drawdown Average peak-to-trough decline	-17.04%	-4.03%	-13.01%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.26%	3.03%	+0.23%

Volatility

USBOX vs. PRBLX - Volatility Comparison

Pear Tree Quality Fund (USBOX) and Parnassus Core Equity Fund Investor Shares (PRBLX) have volatilities of 3.55% and 3.70%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	USBOX	PRBLX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.55%	3.70%	-0.15%
Volatility (6M) Calculated over the trailing 6-month period	10.31%	10.38%	-0.07%
Volatility (1Y) Calculated over the trailing 1-year period	13.08%	12.90%	+0.18%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.15%	16.40%	-0.25%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.15%	17.28%	-0.13%

USBOX vs. PRBLX - Expense Ratio Comparison

USBOX has a 1.16% expense ratio, which is higher than PRBLX's 0.81% expense ratio.

Dividends

USBOX vs. PRBLX - Dividend Comparison

USBOX's dividend yield for the trailing twelve months is around 27.36%, more than PRBLX's 17.66% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
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%
USBOX Pear Tree Quality Fund	27.36%	29.17%	8.71%	4.37%	14.55%	0.88%	7.47%	19.65%	15.43%	6.92%	6.19%	12.85%

Frequently Asked Questions

Can I hold both USBOX and PRBLX in my portfolio?

USBOX and PRBLX have a correlation of 0.87, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, USBOX or PRBLX?

PRBLX has higher volatility (3.70%) compared to USBOX (3.55%). In terms of maximum drawdown, USBOX dropped -65.67% vs PRBLX's -42.20%.

Which has better risk-adjusted returns?

USBOX currently has the higher Sharpe Ratio (1.33 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.