PRULX vs. FXAIX

Last updated Apr 1, 2026

Compare and contrast key facts about T. Rowe Price U.S. Treasury Long Term Index Fund (PRULX) and Fidelity 500 Index Fund (FXAIX).

PRULX is managed by T. Rowe Price. It was launched on Sep 28, 1989. FXAIX is a passively managed fund by Fidelity that tracks the performance of the S&P 500 Index. It was launched on Feb 17, 1988.

Performance

PRULX vs. FXAIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in T. Rowe Price U.S. Treasury Long Term Index Fund (PRULX) and Fidelity 500 Index Fund (FXAIX). The values are adjusted to include any dividend payments, if applicable.

PRULX vs. FXAIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PRULX T. Rowe Price U.S. Treasury Long Term Index Fund	-0.49%	8.43%	-6.61%	2.91%	-30.45%	-5.22%	18.34%	22.58%	-1.86%	8.23%
FXAIX Fidelity 500 Index Fund	-7.05%	17.84%	25.01%	26.29%	-18.14%	28.71%	18.42%	31.48%	-4.43%	21.82%

Returns By Period

In the year-to-date period, PRULX achieves a -0.49% return, which is significantly higher than FXAIX's -7.05% return. Over the past 10 years, PRULX has underperformed FXAIX with an annualized return of -0.20%, while FXAIX has yielded a comparatively higher 13.75% annualized return.

PRULX

• 1D: 1.29%
• 1M: -4.32%
• YTD: -0.49%
• 6M: 0.35%
• 1Y: 3.11%
• 3Y*: -0.91%
• 5Y*: -4.64%
• 10Y*: -0.20%

FXAIX

• 1D: -0.39%
• 1M: -7.68%
• YTD: -7.05%
• 6M: -4.59%
• 1Y: 14.42%
• 3Y*: 17.17%
• 5Y*: 11.40%
• 10Y*: 13.75%

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

PRULX vs. FXAIX - Expense Ratio Comparison

PRULX has a 0.29% expense ratio, which is higher than FXAIX's 0.02% expense ratio.

PRULX

T. Rowe Price U.S. Treasury Long Term Index Fund

FXAIX

Fidelity 500 Index Fund

Return for Risk

PRULX vs. FXAIX — Risk / Return Rank

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

PRULX

PRULX Risk / Return Rank: 14
PRULX Sharpe Ratio Rank: 16
PRULX Sortino Ratio Rank: 14
PRULX Omega Ratio Rank: 13
PRULX Calmar Ratio Rank: 14
PRULX Martin Ratio Rank: 12

FXAIX

FXAIX Risk / Return Rank: 46
FXAIX Sharpe Ratio Rank: 41
FXAIX Sortino Ratio Rank: 45
FXAIX Omega Ratio Rank: 50
FXAIX Calmar Ratio Rank: 41
FXAIX Martin Ratio Rank: 53

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.

PRULX vs. FXAIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for T. Rowe Price U.S. Treasury Long Term Index Fund (PRULX) and Fidelity 500 Index Fund (FXAIX). 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.

	PRULX	FXAIX	Difference
Sharpe ratio Return per unit of total volatility	0.41	0.84	-0.43
Sortino ratio Return per unit of downside risk	0.62	1.30	-0.68
Omega ratio Gain probability vs. loss probability	1.08	1.20	-0.12
Calmar ratio Return relative to maximum drawdown	0.39	1.05	-0.67
Martin ratio Return relative to average drawdown	0.95	5.13	-4.18
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

PRULX vs. FXAIX - Sharpe Ratio Comparison

The current PRULX Sharpe Ratio is 0.41, which is lower than the FXAIX Sharpe Ratio of 0.84. The chart below compares the historical Sharpe Ratios of PRULX and FXAIX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	PRULX	FXAIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.41	0.84	-0.43
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.32	0.68	-1.00
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	-0.01	0.77	-0.78
Sharpe Ratio (All Time) Calculated using the full available price history	0.45	0.75	-0.30

Correlation

The correlation between PRULX and FXAIX is -0.23. This indicates that the assets' prices tend to move in opposite directions. Negative correlation can be particularly beneficial for diversification and risk management, as one asset may offset the losses of the other during market fluctuations.

Dividends

PRULX vs. FXAIX - Dividend Comparison

PRULX's dividend yield for the trailing twelve months is around 6.90%, more than FXAIX's 1.20% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PRULX T. Rowe Price U.S. Treasury Long Term Index Fund	6.90%	6.83%	3.89%	3.84%	2.07%	1.72%	20.34%	16.60%	2.62%	2.48%	4.65%	5.09%
FXAIX Fidelity 500 Index Fund	1.20%	1.11%	1.25%	1.45%	1.69%	1.22%	1.60%	2.06%	2.72%	1.97%	2.52%	2.83%

Drawdowns

PRULX vs. FXAIX - Drawdown Comparison

The maximum PRULX drawdown since its inception was -47.40%, which is greater than FXAIX's maximum drawdown of -33.79%. Use the drawdown chart below to compare losses from any high point for PRULX and FXAIX.

Drawdown Indicators

	PRULX	FXAIX	Difference
Max Drawdown Largest peak-to-trough decline	-47.40%	-33.79%	-13.61%
Max Drawdown (1Y) Largest decline over 1 year	-8.46%	-12.13%	+3.67%
Max Drawdown (5Y) Largest decline over 5 years	-42.35%	-24.50%	-17.85%
Max Drawdown (10Y) Largest decline over 10 years	-47.40%	-33.79%	-13.61%
Current Drawdown Current decline from peak	-36.53%	-8.89%	-27.64%
Average Drawdown Average peak-to-trough decline	-9.24%	-3.83%	-5.41%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.47%	2.50%	+0.97%

Volatility

PRULX vs. FXAIX - Volatility Comparison

The current volatility for T. Rowe Price U.S. Treasury Long Term Index Fund (PRULX) is 3.57%, while Fidelity 500 Index Fund (FXAIX) has a volatility of 4.24%. This indicates that PRULX experiences smaller price fluctuations and is considered to be less risky than FXAIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	PRULX	FXAIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.57%	4.24%	-0.67%
Volatility (6M) Calculated over the trailing 6-month period	6.39%	9.08%	-2.69%
Volatility (1Y) Calculated over the trailing 1-year period	10.82%	18.13%	-7.31%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.68%	16.88%	-2.20%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	14.00%	18.03%	-4.03%