PRULX vs. FXAIX
PRULX (T. Rowe Price U.S. Treasury Long Term Index Fund) and FXAIX (Fidelity 500 Index Fund) are both mutual funds - PRULX is a Government Bonds fund managed by T. Rowe Price, while FXAIX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, PRULX returned -1.14%/yr vs 15.18%/yr for FXAIX. Their -0.22 correlation means they have often moved in opposite directions in the past. PRULX charges 0.29%/yr vs 0.02%/yr for FXAIX.
Performance
PRULX vs. FXAIX - Performance Comparison
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Returns By Period
In the year-to-date period, PRULX achieves a -3.51% return, which is significantly lower than FXAIX's 11.76% return. Over the past 10 years, PRULX has underperformed FXAIX with an annualized return of -1.14%, while FXAIX has yielded a comparatively higher 15.18% annualized return.
PRULX
- 1D
- 0.30%
- 1M
- -3.42%
- 6M
- -2.88%
- YTD
- -3.51%
- 1Y
- -0.82%
- 3Y*
- 0.42%
- 5Y*
- -7.37%
- 10Y*
- -1.14%
- ALL TIME*
- 4.98%
FXAIX
- 1D
- 1.48%
- 1M
- 1.63%
- 6M
- 10.50%
- YTD
- 11.76%
- 1Y
- 21.49%
- 3Y*
- 20.87%
- 5Y*
- 13.14%
- 10Y*
- 15.18%
- ALL TIME*
- 14.04%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $0.00 | $0.00 | $0.00 | |
| $0.00 | $0.00 | $0.00 |
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 | -3.51% | 6.69% | -5.71% | 2.90% | -30.45% | -5.22% | 18.34% | 22.58% | -1.86% | 8.23% |
FXAIX Fidelity 500 Index Fund | 11.76% | 17.84% | 25.01% | 26.29% | -18.14% | 28.71% | 18.42% | 31.48% | -4.43% | 21.82% |
Correlation
The correlation between PRULX and FXAIX is 0.24, which is low. Their historical price movements had little consistent relationship.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.24 |
Correlation (3Y) Balances recent behavior with more history. | 0.16 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.08 |
Correlation (10Y) Provides a long-term view across more market conditions. | -0.08 |
Correlation (All Time) Calculated using the full available price history since May 4, 2011 | -0.22 |
The correlation between PRULX and FXAIX shifts across timeframes, from -0.22 (all time) to 0.24 (1 year), reflecting how their relationship changes across market environments.
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Return for Risk
PRULX vs. FXAIX — Risk / Return Rank
PRULX
FXAIX
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.
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.
| PRULX | FXAIX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -1.90 | ||
| Sortino ratioReturn per unit of downside risk | -2.56 | ||
| Omega ratioGain probability vs. loss probability | 0.99 | 1.33 | -0.33 |
| Calmar ratioReturn relative to maximum drawdown | -0.10 | 2.63 | -2.73 |
| Martin ratioReturn relative to average drawdown | -0.22 | 11.30 | -11.51 |
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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.
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Drawdown Indicators
| PRULX | FXAIX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -47.40% | -33.79% | -13.61% |
Max Drawdown (1Y)Largest decline over 1 year | -7.23% | -8.89% | +1.66% |
Max Drawdown (3Y)Largest decline over 3 years | -13.44% | -18.76% | +5.32% |
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 DrawdownCurrent decline from peak | -38.86% | 0.00% | -38.86% |
Average DrawdownAverage peak-to-trough decline | -9.49% | -3.77% | -5.72% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 3.20% | 2.07% | +1.13% |
Volatility
PRULX vs. FXAIX - Volatility Comparison
The current volatility for T. Rowe Price U.S. Treasury Long Term Index Fund (PRULX) is 2.27%, while Fidelity 500 Index Fund (FXAIX) has a volatility of 3.81%. 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.
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Volatility by Period
| PRULX | FXAIX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 2.27% | 3.81% | -1.54% |
Volatility (6M)Calculated over the trailing 6-month period | 6.53% | 10.20% | -3.67% |
Volatility (1Y)Calculated over the trailing 1-year period | 8.82% | 12.86% | -4.04% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 14.55% | 17.04% | -2.49% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 13.92% | 18.09% | -4.17% |
PRULX vs. FXAIX - Expense Ratio Comparison
PRULX has a 0.29% expense ratio, which is higher than FXAIX's 0.02% expense ratio.
Dividends
PRULX vs. FXAIX - Dividend Comparison
PRULX's dividend yield for the trailing twelve months is around 5.18%, more than FXAIX's 1.04% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
FXAIX Fidelity 500 Index Fund | 1.04% | 1.11% | 1.25% | 1.45% | 1.69% | 1.22% | 1.60% | 2.06% | 2.72% | 1.97% | 2.52% | 2.83% |
PRULX T. Rowe Price U.S. Treasury Long Term Index Fund | 5.18% | 5.21% | 4.88% | 3.84% | 2.07% | 1.72% | 20.34% | 16.60% | 2.62% | 2.48% | 4.65% | 5.09% |
Frequently Asked Questions
PRULX and FXAIX have a correlation of 0.24, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
FXAIX has higher volatility (3.81%) compared to PRULX (2.27%). In terms of maximum drawdown, PRULX dropped -47.40% vs FXAIX's -33.79%.
FXAIX currently has the higher Sharpe Ratio (1.82 vs -0.08), 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.
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