WSEFX vs. PRBLX

Last updated Jun 3, 2026

WSEFX (Boston Trust Walden Equity Fund) and PRBLX (Parnassus Core Equity Fund) are both Large Cap Blend Equities funds. Over the past 10 years, WSEFX returned 12.38%/yr vs 13.61%/yr for PRBLX. Their correlation of 0.93 suggests significant overlap in exposure. WSEFX charges 1.00%/yr vs 0.82%/yr for PRBLX.

Performance

WSEFX vs. PRBLX - Performance Comparison

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

Returns By Period

In the year-to-date period, WSEFX achieves a 7.83% return, which is significantly higher than PRBLX's 6.62% return. Over the past 10 years, WSEFX has underperformed PRBLX with an annualized return of 12.38%, while PRBLX has yielded a comparatively higher 13.61% annualized return.

WSEFX

• 1D: 0.05%
• 1M: 3.03%
• YTD: 7.83%
• 6M: 7.52%
• 1Y: 25.75%
• 3Y*: 13.80%
• 5Y*: 9.03%
• 10Y*: 12.38%

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%

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

WSEFX vs. PRBLX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
WSEFX Boston Trust Walden Equity Fund	7.83%	13.26%	9.78%	16.31%	-13.53%	27.97%	13.57%	35.43%	-2.54%	15.84%
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%

Correlation

The correlation between WSEFX and PRBLX is 0.89, 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	0.89
Correlation (3Y) Calculated over the trailing 3-year period	0.90
Correlation (5Y) Calculated over the trailing 5-year period	0.93
Correlation (10Y) Calculated over the trailing 10-year period	0.93
Correlation (All Time) Calculated using the full available price history since Jun 21, 1999	0.93

The correlation between WSEFX and PRBLX has been stable across timeframes, ranging from 0.89 to 0.93 - a consistent structural relationship.

Return for Risk

WSEFX vs. PRBLX — Risk / Return Rank

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

WSEFX

WSEFX Risk / Return Rank: 63
WSEFX Sharpe Ratio Rank: 63
WSEFX Sortino Ratio Rank: 63
WSEFX Omega Ratio Rank: 59
WSEFX Calmar Ratio Rank: 60
WSEFX Martin Ratio Rank: 70

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

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.

WSEFX vs. PRBLX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Boston Trust Walden Equity Fund (WSEFX) and Parnassus Core Equity Fund (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.

	WSEFX	PRBLX	Difference
Sharpe ratio Return per unit of total volatility	2.34	1.36	+0.98
Sortino ratio Return per unit of downside risk	3.31	1.95	+1.36
Omega ratio Gain probability vs. loss probability	1.43	1.24	+0.19
Calmar ratio Return relative to maximum drawdown	2.97	1.42	+1.55
Martin ratio Return relative to average drawdown	13.54	5.54	+8.00
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

WSEFX vs. PRBLX - Sharpe Ratio Comparison

The current WSEFX Sharpe Ratio is 2.34, which is higher than the PRBLX Sharpe Ratio of 1.36. The chart below compares the historical Sharpe Ratios of WSEFX 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.

Sharpe Ratios by Period

	WSEFX	PRBLX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.34	1.36	+0.98
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.58	0.63	-0.05
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.72	0.79	-0.07
Sharpe Ratio (All Time) Calculated using the full available price history	0.45	0.71	-0.26

Drawdowns

WSEFX vs. PRBLX - Drawdown Comparison

The maximum WSEFX drawdown since its inception was -48.02%, which is greater than PRBLX's maximum drawdown of -42.20%. Use the drawdown chart below to compare losses from any high point for WSEFX and PRBLX.

Drawdown Indicators

	WSEFX	PRBLX	Difference
Max Drawdown Largest peak-to-trough decline	-48.02%	-42.20%	-5.82%
Max Drawdown (1Y) Largest decline over 1 year	-8.65%	-11.63%	+2.98%
Max Drawdown (3Y) Largest decline over 3 years	-17.49%	-16.31%	-1.18%
Max Drawdown (5Y) Largest decline over 5 years	-21.99%	-26.31%	+4.32%
Max Drawdown (10Y) Largest decline over 10 years	-33.50%	-30.09%	-3.41%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-6.08%	-4.05%	-2.03%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.90%	2.97%	-1.07%

Volatility

WSEFX vs. PRBLX - Volatility Comparison

The current volatility for Boston Trust Walden Equity Fund (WSEFX) is 2.29%, while Parnassus Core Equity Fund (PRBLX) has a volatility of 3.07%. This indicates that WSEFX 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

	WSEFX	PRBLX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.29%	3.07%	-0.78%
Volatility (6M) Calculated over the trailing 6-month period	8.17%	9.12%	-0.95%
Volatility (1Y) Calculated over the trailing 1-year period	11.07%	11.80%	-0.73%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.57%	16.25%	-0.68%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.27%	17.27%	0.00%

WSEFX vs. PRBLX - Expense Ratio Comparison

WSEFX has a 1.00% expense ratio, which is higher than PRBLX's 0.82% expense ratio.

Dividends

WSEFX vs. PRBLX - Dividend Comparison

WSEFX's dividend yield for the trailing twelve months is around 10.71%, less than PRBLX's 17.85% 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%
WSEFX Boston Trust Walden Equity Fund	10.71%	11.55%	4.95%	2.99%	3.31%	2.24%	4.15%	5.27%	2.20%	0.92%	3.39%	6.82%

Frequently Asked Questions

Can I hold both WSEFX and PRBLX in my portfolio?

WSEFX and PRBLX have a correlation of 0.89, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, WSEFX or PRBLX?

PRBLX has higher volatility (3.07%) compared to WSEFX (2.29%). In terms of maximum drawdown, WSEFX dropped -48.02% vs PRBLX's -42.20%.

Which has better risk-adjusted returns?

WSEFX currently has the higher Sharpe Ratio (2.34 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.