PRBLX vs. USBOX

Last updated Jun 3, 2026

PRBLX (Parnassus Core Equity Fund) and USBOX (Pear Tree Quality Fund) are both Large Cap Blend Equities funds. Over the past 10 years, PRBLX returned 13.61%/yr vs 13.78%/yr for USBOX. Their correlation of 0.86 suggests significant overlap in exposure. PRBLX charges 0.82%/yr vs 1.16%/yr for USBOX.

Performance

PRBLX vs. USBOX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Parnassus Core Equity Fund (PRBLX) and Pear Tree Quality Fund (USBOX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, PRBLX achieves a 6.62% return, which is significantly higher than USBOX's 5.57% return. Both investments have delivered pretty close results over the past 10 years, with PRBLX having a 13.61% annualized return and USBOX not far ahead at 13.78%.

PRBLX

• 1D: 0.42%
• 1M: 3.31%
• YTD: 6.62%
• 6M: 6.14%
• 1Y: 15.71%
• 3Y*: 16.52%
• 5Y*: 10.25%
• 10Y*: 13.61%

USBOX

• 1D: 0.05%
• 1M: 3.77%
• YTD: 5.57%
• 6M: 6.69%
• 1Y: 19.82%
• 3Y*: 16.77%
• 5Y*: 9.53%
• 10Y*: 13.78%

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

PRBLX vs. USBOX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PRBLX Parnassus Core Equity Fund	6.62%	11.67%	18.58%	24.97%	-18.64%	27.59%	21.21%	30.68%	-0.30%	16.63%
USBOX Pear Tree Quality Fund	5.57%	15.77%	17.99%	29.20%	-16.25%	16.50%	18.06%	31.18%	-1.97%	28.49%

Correlation

The correlation between PRBLX and USBOX is 0.86, 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	0.86
Correlation (3Y) Calculated over the trailing 3-year period	0.88
Correlation (5Y) Calculated over the trailing 5-year period	0.91
Correlation (10Y) Calculated over the trailing 10-year period	0.91
Correlation (All Time) Calculated using the full available price history since Jan 5, 1993	0.86

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

Return for Risk

PRBLX vs. USBOX — Risk / Return Rank

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

PRBLX

PRBLX Risk / Return Rank: 19
PRBLX Sharpe Ratio Rank: 21
PRBLX Sortino Ratio Rank: 20
PRBLX Omega Ratio Rank: 20
PRBLX Calmar Ratio Rank: 15
PRBLX Martin Ratio Rank: 20

USBOX

USBOX Risk / Return Rank: 26
USBOX Sharpe Ratio Rank: 31
USBOX Sortino Ratio Rank: 30
USBOX Omega Ratio Rank: 29
USBOX Calmar Ratio Rank: 17
USBOX Martin Ratio Rank: 23

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.

PRBLX vs. USBOX - Risk-Adjusted Trends Comparison

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

	PRBLX	USBOX	Difference
Sharpe ratio Return per unit of total volatility	1.36	1.63	-0.26
Sortino ratio Return per unit of downside risk	1.95	2.32	-0.37
Omega ratio Gain probability vs. loss probability	1.24	1.28	-0.04
Calmar ratio Return relative to maximum drawdown	1.42	1.55	-0.14
Martin ratio Return relative to average drawdown	5.54	6.06	-0.52
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

PRBLX vs. USBOX - Sharpe Ratio Comparison

The current PRBLX Sharpe Ratio is 1.36, which is comparable to the USBOX Sharpe Ratio of 1.63. The chart below compares the historical Sharpe Ratios of PRBLX and USBOX, 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

	PRBLX	USBOX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.36	1.63	-0.26
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.63	0.60	+0.04
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.79	0.81	-0.02
Sharpe Ratio (All Time) Calculated using the full available price history	0.71	0.47	+0.25

Drawdowns

PRBLX vs. USBOX - Drawdown Comparison

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

Drawdown Indicators

	PRBLX	USBOX	Difference
Max Drawdown Largest peak-to-trough decline	-42.20%	-65.67%	+23.47%
Max Drawdown (1Y) Largest decline over 1 year	-11.63%	-12.76%	+1.13%
Max Drawdown (3Y) Largest decline over 3 years	-16.31%	-15.41%	-0.90%
Max Drawdown (5Y) Largest decline over 5 years	-26.31%	-30.42%	+4.11%
Max Drawdown (10Y) Largest decline over 10 years	-30.09%	-30.42%	+0.33%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-4.05%	-17.11%	+13.06%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.97%	3.27%	-0.30%

Volatility

PRBLX vs. USBOX - Volatility Comparison

Parnassus Core Equity Fund (PRBLX) has a higher volatility of 3.07% compared to Pear Tree Quality Fund (USBOX) at 2.76%. This indicates that PRBLX's price experiences larger fluctuations and is considered to be riskier than USBOX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	PRBLX	USBOX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.07%	2.76%	+0.31%
Volatility (6M) Calculated over the trailing 6-month period	9.12%	9.69%	-0.57%
Volatility (1Y) Calculated over the trailing 1-year period	11.80%	12.54%	-0.74%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.25%	16.08%	+0.17%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.27%	17.15%	+0.12%

PRBLX vs. USBOX - Expense Ratio Comparison

PRBLX has a 0.82% expense ratio, which is lower than USBOX's 1.16% expense ratio.

Dividends

PRBLX vs. USBOX - Dividend Comparison

PRBLX's dividend yield for the trailing twelve months is around 17.85%, less than USBOX's 27.63% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PRBLX Parnassus Core Equity Fund	17.85%	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	27.63%	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 PRBLX and USBOX in my portfolio?

PRBLX and USBOX have a correlation of 0.86, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, PRBLX or USBOX?

PRBLX has higher volatility (3.07%) compared to USBOX (2.76%). In terms of maximum drawdown, PRBLX dropped -42.20% vs USBOX's -65.67%.

Which has better risk-adjusted returns?

USBOX currently has the higher Sharpe Ratio (1.63 vs 1.36), 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.