PRUIX vs. PCCOX

Last updated Aug 4, 2026

PRUIX (T. Rowe Price Equity Index 500 Fund - I Class) and PCCOX (T. Rowe Price U.S. Equity Research Fund I Class) are both Large Cap Blend Equities funds from T. Rowe Price tracking the S&P 500 Index. Both are passively managed. Over the past 5 years, PRUIX returned 12.80%/yr vs 13.32%/yr for PCCOX. Their 0.99 correlation means they have historically moved very closely together. PRUIX charges 0.05%/yr vs 0.34%/yr for PCCOX.

Performance

PRUIX vs. PCCOX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in T. Rowe Price Equity Index 500 Fund - I Class (PRUIX) and T. Rowe Price U.S. Equity Research Fund I Class (PCCOX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both stocks are quite close, with PRUIX having a 10.08% return and PCCOX slightly lower at 10.00%.

PRUIX

• 1D: 0.70%
• 1M: 0.14%
• 6M: 7.93%
• YTD: 10.08%
• 1Y: 21.42%
• 3Y*: 19.36%
• 5Y*: 12.80%
• 10Y*: 15.06%
• ALL TIME*: 15.07%

PCCOX

• 1D: 0.68%
• 1M: -0.31%
• 6M: 7.54%
• YTD: 10.00%
• 1Y: 20.74%
• 3Y*: 19.74%
• 5Y*: 13.32%
• 10Y*: —
• ALL TIME*: 15.93%

*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)
PCCOX T. Rowe Price U.S. Equity Research Fund I Class	$0.00	$0.00	$0.00
PRUIX T. Rowe Price Equity Index 500 Fund - I Class	$0.00	$0.00	$0.00

PRUIX vs. PCCOX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PRUIX T. Rowe Price Equity Index 500 Fund - I Class	10.08%	17.82%	24.95%	26.24%	-18.14%	28.62%	18.31%	31.63%	-4.44%	21.14%
PCCOX T. Rowe Price U.S. Equity Research Fund I Class	10.00%	16.49%	26.56%	29.93%	-18.71%	28.17%	19.96%	33.13%	-4.55%	23.01%

Correlation

The correlation between PRUIX and PCCOX is 0.97 - they have historically moved very closely together. At this level, their price movements offset little of one another.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.97
Correlation (3Y) Balances recent behavior with more history.	0.99
Correlation (5Y) Shows whether the relationship held over a longer period.	0.99
Correlation (All Time) Calculated using the full available price history since Jan 3, 2017	0.99

The correlation between PRUIX and PCCOX has been stable across timeframes, ranging from 0.97 to 0.99 - a consistent structural relationship.

Return for Risk

PRUIX vs. PCCOX — Risk / Return Rank

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

PRUIX

PRUIX Risk / Return Rank: 58
PRUIX Sharpe Ratio Rank: 55
PRUIX Sortino Ratio Rank: 51
PRUIX Omega Ratio Rank: 52
PRUIX Calmar Ratio Rank: 60
PRUIX Martin Ratio Rank: 72

PCCOX

PCCOX Risk / Return Rank: 52
PCCOX Sharpe Ratio Rank: 49
PCCOX Sortino Ratio Rank: 48
PCCOX Omega Ratio Rank: 45
PCCOX Calmar Ratio Rank: 52
PCCOX Martin Ratio Rank: 65

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.

PRUIX vs. PCCOX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for T. Rowe Price Equity Index 500 Fund - I Class (PRUIX) and T. Rowe Price U.S. Equity Research Fund I Class (PCCOX). 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.

	PRUIX	PCCOX	Difference
Sharpe ratio: Return per unit of total volatility	1.52	1.45	+0.07
Sortino ratio: Return per unit of downside risk	2.11	2.05	+0.07
Omega ratio: Gain probability vs. loss probability	1.27	1.26	+0.02
Calmar ratio: Return relative to maximum drawdown	2.20	2.04	+0.16
Martin ratio: Return relative to average drawdown	9.43	8.77	+0.67

PRUIX vs. PCCOX - Sharpe Ratio Comparison

The current PRUIX Sharpe Ratio is 1.52, which is comparable to the PCCOX Sharpe Ratio of 1.45. The chart below compares the historical Sharpe Ratios of PRUIX and PCCOX, 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

PRUIX vs. PCCOX - Drawdown Comparison

The maximum PRUIX drawdown since its inception was -33.80%, roughly equal to the maximum PCCOX drawdown of -34.42%. Use the drawdown chart below to compare losses from any high point for PRUIX and PCCOX.

Drawdown Indicators

	PRUIX	PCCOX	Difference
Max Drawdown Largest peak-to-trough decline	-33.80%	-34.42%	+0.62%
Max Drawdown (1Y) Largest decline over 1 year	-8.91%	-9.30%	+0.39%
Max Drawdown (3Y) Largest decline over 3 years	-18.76%	-19.37%	+0.61%
Max Drawdown (5Y) Largest decline over 5 years	-24.52%	-24.90%	+0.38%
Max Drawdown (10Y) Largest decline over 10 years	-33.80%	—	—
Current Drawdown Current decline from peak	-1.42%	-1.89%	+0.47%
Average Drawdown Average peak-to-trough decline	-4.19%	-4.46%	+0.27%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.07%	2.16%	-0.09%

Volatility

PRUIX vs. PCCOX - Volatility Comparison

T. Rowe Price Equity Index 500 Fund - I Class (PRUIX) and T. Rowe Price U.S. Equity Research Fund I Class (PCCOX) have volatilities of 3.51% and 3.66%, 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

	PRUIX	PCCOX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.51%	3.66%	-0.15%
Volatility (6M) Calculated over the trailing 6-month period	10.11%	10.67%	-0.56%
Volatility (1Y) Calculated over the trailing 1-year period	12.87%	13.10%	-0.23%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.10%	17.47%	-0.37%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.10%	18.66%	-0.56%

PRUIX vs. PCCOX - Expense Ratio Comparison

PRUIX has a 0.05% expense ratio, which is lower than PCCOX's 0.34% expense ratio.

Dividends

PRUIX vs. PCCOX - Dividend Comparison

PRUIX's dividend yield for the trailing twelve months is around 2.26%, more than PCCOX's 1.12% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
PCCOX T. Rowe Price U.S. Equity Research Fund I Class	1.12%	1.23%	0.71%	1.22%	1.38%	3.78%	1.12%	1.45%	5.77%	7.18%	0.00%
PRUIX T. Rowe Price Equity Index 500 Fund - I Class	2.26%	2.44%	1.28%	1.44%	1.69%	1.64%	2.09%	2.25%	2.77%	1.39%	2.16%

Frequently Asked Questions

Can I hold both PRUIX and PCCOX in my portfolio?

With a correlation of 0.97, PRUIX and PCCOX 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, PRUIX or PCCOX?

PCCOX has higher volatility (3.66%) compared to PRUIX (3.51%). In terms of maximum drawdown, PRUIX dropped -33.80% vs PCCOX's -34.42%.

Which has better risk-adjusted returns?

PRUIX currently has the higher Sharpe Ratio (1.52 vs 1.45), 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.