PRCOX vs. PRBLX

Last updated Aug 1, 2026

PRCOX (T. Rowe Price U.S. Equity Research Fund) and PRBLX (Parnassus Core Equity Fund Investor Shares) are both Large Cap Blend Equities funds. Both are actively managed. Over the past 10 years, PRCOX returned 15.49%/yr vs 13.50%/yr for PRBLX. Their correlation of 0.90 means they have usually moved in the same direction. PRCOX charges 0.42%/yr vs 0.81%/yr for PRBLX.

Performance

PRCOX vs. PRBLX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in T. Rowe Price U.S. Equity Research Fund (PRCOX) 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, PRCOX achieves a 9.19% return, which is significantly higher than PRBLX's 7.76% return. Over the past 10 years, PRCOX has outperformed PRBLX with an annualized return of 15.49%, while PRBLX has yielded a comparatively lower 13.50% annualized return.

PRCOX

• 1D: 1.65%
• 1M: -0.98%
• 6M: 7.45%
• YTD: 9.19%
• 1Y: 19.80%
• 3Y*: 19.25%
• 5Y*: 13.05%
• 10Y*: 15.49%
• ALL TIME*: 10.53%

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
PRCOX T. Rowe Price U.S. Equity Research Fund	$0.00	$0.00	$0.00

PRCOX vs. PRBLX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PRCOX T. Rowe Price U.S. Equity Research Fund	9.19%	16.34%	26.41%	29.82%	-18.80%	28.06%	19.82%	33.04%	-4.73%	23.80%
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 PRCOX and PRBLX is 0.89, 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.	0.89
Correlation (3Y) Balances recent behavior with more history.	0.92
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 3, 1995	0.90

The correlation between PRCOX and PRBLX has been stable across timeframes, ranging from 0.89 to 0.95 - a consistent structural relationship.

Return for Risk

PRCOX vs. PRBLX — Risk / Return Rank

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

PRCOX

PRCOX Risk / Return Rank: 56
PRCOX Sharpe Ratio Rank: 54
PRCOX Sortino Ratio Rank: 53
PRCOX Omega Ratio Rank: 50
PRCOX Calmar Ratio Rank: 56
PRCOX Martin Ratio Rank: 67

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.

PRCOX vs. PRBLX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for T. Rowe Price U.S. Equity Research Fund (PRCOX) 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.

	PRCOX	PRBLX	Difference
Sharpe ratio: Return per unit of total volatility	1.35	0.71	+0.64
Sortino ratio: Return per unit of downside risk	1.92	1.07	+0.85
Omega ratio: Gain probability vs. loss probability	1.24	1.13	+0.11
Calmar ratio: Return relative to maximum drawdown	1.90	0.79	+1.11
Martin ratio: Return relative to average drawdown	8.13	3.05	+5.08

PRCOX vs. PRBLX - Sharpe Ratio Comparison

The current PRCOX Sharpe Ratio is 1.35, which is higher than the PRBLX Sharpe Ratio of 0.71. The chart below compares the historical Sharpe Ratios of PRCOX 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

PRCOX vs. PRBLX - Drawdown Comparison

The maximum PRCOX drawdown since its inception was -53.96%, which is greater than PRBLX's maximum drawdown of -42.20%. Use the drawdown chart below to compare losses from any high point for PRCOX and PRBLX.

Drawdown Indicators

	PRCOX	PRBLX	Difference
Max Drawdown Largest peak-to-trough decline	-53.96%	-42.20%	-11.76%
Max Drawdown (1Y) Largest decline over 1 year	-9.32%	-11.63%	+2.31%
Max Drawdown (3Y) Largest decline over 3 years	-19.39%	-16.31%	-3.08%
Max Drawdown (5Y) Largest decline over 5 years	-24.94%	-26.31%	+1.37%
Max Drawdown (10Y) Largest decline over 10 years	-34.42%	-30.09%	-4.33%
Current Drawdown Current decline from peak	-2.57%	-1.70%	-0.87%
Average Drawdown Average peak-to-trough decline	-9.14%	-4.03%	-5.11%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.17%	3.03%	-0.86%

Volatility

PRCOX vs. PRBLX - Volatility Comparison

T. Rowe Price U.S. Equity Research Fund (PRCOX) and Parnassus Core Equity Fund Investor Shares (PRBLX) have volatilities of 3.61% 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

	PRCOX	PRBLX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.61%	3.70%	-0.09%
Volatility (6M) Calculated over the trailing 6-month period	10.65%	10.38%	+0.27%
Volatility (1Y) Calculated over the trailing 1-year period	13.10%	12.90%	+0.20%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.48%	16.40%	+1.08%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.36%	17.28%	+1.08%

PRCOX vs. PRBLX - Expense Ratio Comparison

PRCOX has a 0.42% expense ratio, which is lower than PRBLX's 0.81% expense ratio.

Dividends

PRCOX vs. PRBLX - Dividend Comparison

PRCOX's dividend yield for the trailing twelve months is around 1.07%, less 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%
PRCOX T. Rowe Price U.S. Equity Research Fund	1.07%	1.17%	0.64%	1.17%	1.28%	3.71%	1.04%	1.39%	5.60%	7.02%	7.28%	8.76%

Frequently Asked Questions

Can I hold both PRCOX and PRBLX in my portfolio?

PRCOX 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, PRCOX or PRBLX?

PRBLX has higher volatility (3.70%) compared to PRCOX (3.61%). In terms of maximum drawdown, PRCOX dropped -53.96% vs PRBLX's -42.20%.

Which has better risk-adjusted returns?

PRCOX currently has the higher Sharpe Ratio (1.35 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.