PRINX vs. PREIX

Last updated Jun 24, 2026

PRINX (T. Rowe Price Summit Municipal Income Fund) and PREIX (T. Rowe Price Equity Index 500 Fund) are both mutual funds - PRINX is a Municipal Bonds fund managed by T. Rowe Price, while PREIX is a Large Cap Blend Equities fund tracking the S&P 500 Index. Over the past 10 years, PRINX returned 1.95%/yr vs 15.55%/yr for PREIX. At a correlation of -0.03, they often move in opposite directions. PRINX charges 0.50%/yr vs 0.15%/yr for PREIX.

Performance

PRINX vs. PREIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in T. Rowe Price Summit Municipal Income Fund (PRINX) and T. Rowe Price Equity Index 500 Fund (PREIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, PRINX achieves a 2.38% return, which is significantly lower than PREIX's 9.68% return. Over the past 10 years, PRINX has underperformed PREIX with an annualized return of 1.95%, while PREIX has yielded a comparatively higher 15.55% annualized return.

PRINX

• 1D: -0.09%
• 1M: 1.95%
• YTD: 2.38%
• 6M: 2.90%
• 1Y: 7.93%
• 3Y*: 3.75%
• 5Y*: 0.57%
• 10Y*: 1.95%

PREIX

• 1D: -0.37%
• 1M: 0.08%
• YTD: 9.68%
• 6M: 8.67%
• 1Y: 25.27%
• 3Y*: 21.17%
• 5Y*: 13.41%
• 10Y*: 15.55%

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

PRINX vs. PREIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PRINX T. Rowe Price Summit Municipal Income Fund	2.38%	3.29%	2.36%	6.71%	-11.67%	3.16%	4.60%	7.81%	0.40%	5.94%
PREIX T. Rowe Price Equity Index 500 Fund	9.68%	17.66%	24.78%	26.07%	-18.27%	28.48%	18.17%	31.47%	-4.59%	21.01%

Correlation

The correlation between PRINX and PREIX is 0.18, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.18
Correlation (3Y) Calculated over the trailing 3-year period	0.14
Correlation (5Y) Calculated over the trailing 5-year period	0.12
Correlation (10Y) Calculated over the trailing 10-year period	0.03
Correlation (All Time) Calculated using the full available price history since Jan 3, 1994	-0.03

The correlation between PRINX and PREIX shifts across timeframes, from -0.03 (all time) to 0.18 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

PRINX vs. PREIX — Risk / Return Rank

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

PRINX

PRINX Risk / Return Rank: 78
PRINX Sharpe Ratio Rank: 90
PRINX Sortino Ratio Rank: 92
PRINX Omega Ratio Rank: 93
PRINX Calmar Ratio Rank: 61
PRINX Martin Ratio Rank: 52

PREIX

PREIX Risk / Return Rank: 64
PREIX Sharpe Ratio Rank: 62
PREIX Sortino Ratio Rank: 56
PREIX Omega Ratio Rank: 58
PREIX Calmar Ratio Rank: 66
PREIX Martin Ratio Rank: 77

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.

PRINX vs. PREIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for T. Rowe Price Summit Municipal Income Fund (PRINX) and T. Rowe Price Equity Index 500 Fund (PREIX). 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.

	PRINX	PREIX	Difference
Sharpe ratio: Return per unit of total volatility	2.77	2.13	+0.64
Sortino ratio: Return per unit of downside risk	4.33	2.88	+1.45
Omega ratio: Gain probability vs. loss probability	1.67	1.39	+0.29
Calmar ratio: Return relative to maximum drawdown	2.85	2.98	-0.13
Martin ratio: Return relative to average drawdown	10.10	13.43	-3.33

PRINX vs. PREIX - Sharpe Ratio Comparison

The current PRINX Sharpe Ratio is 2.77, which is comparable to the PREIX Sharpe Ratio of 2.13. The chart below compares the historical Sharpe Ratios of PRINX and PREIX, 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

PRINX vs. PREIX - Drawdown Comparison

The maximum PRINX drawdown since its inception was -16.27%, smaller than the maximum PREIX drawdown of -55.32%. Use the drawdown chart below to compare losses from any high point for PRINX and PREIX.

Drawdown Indicators

	PRINX	PREIX	Difference
Max Drawdown Largest peak-to-trough decline	-16.27%	-55.32%	+39.05%
Max Drawdown (1Y) Largest decline over 1 year	-2.90%	-8.93%	+6.03%
Max Drawdown (3Y) Largest decline over 3 years	-6.67%	-18.78%	+12.11%
Max Drawdown (5Y) Largest decline over 5 years	-16.27%	-24.60%	+8.33%
Max Drawdown (10Y) Largest decline over 10 years	-16.27%	-33.81%	+17.54%
Current Drawdown Current decline from peak	-0.09%	-1.73%	+1.64%
Average Drawdown Average peak-to-trough decline	-2.18%	-8.71%	+6.53%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.81%	1.98%	-1.17%

Volatility

PRINX vs. PREIX - Volatility Comparison

The current volatility for T. Rowe Price Summit Municipal Income Fund (PRINX) is 0.82%, while T. Rowe Price Equity Index 500 Fund (PREIX) has a volatility of 4.68%. This indicates that PRINX experiences smaller price fluctuations and is considered to be less risky than PREIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	PRINX	PREIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.82%	4.68%	-3.86%
Volatility (6M) Calculated over the trailing 6-month period	2.20%	9.84%	-7.64%
Volatility (1Y) Calculated over the trailing 1-year period	2.99%	12.51%	-9.52%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.39%	17.09%	-12.70%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.29%	18.15%	-13.86%

PRINX vs. PREIX - Expense Ratio Comparison

PRINX has a 0.50% expense ratio, which is higher than PREIX's 0.15% expense ratio.

Dividends

PRINX vs. PREIX - Dividend Comparison

PRINX's dividend yield for the trailing twelve months is around 3.68%, more than PREIX's 2.14% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PREIX T. Rowe Price Equity Index 500 Fund	2.14%	2.32%	1.17%	1.32%	1.50%	1.56%	1.97%	2.13%	2.60%	1.30%	2.03%	2.02%
PRINX T. Rowe Price Summit Municipal Income Fund	3.68%	3.63%	2.78%	2.46%	1.96%	2.14%	2.64%	2.87%	3.12%	3.19%	3.32%	3.42%

Frequently Asked Questions

Can I hold both PRINX and PREIX in my portfolio?

PRINX and PREIX have a correlation of 0.18, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, PRINX or PREIX?

PREIX has higher volatility (4.68%) compared to PRINX (0.82%). In terms of maximum drawdown, PRINX dropped -16.27% vs PREIX's -55.32%.

Which has better risk-adjusted returns?

PRINX currently has the higher Sharpe Ratio (2.77 vs 2.13), 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.