PRULX vs. VSBIX
PRULX (T. Rowe Price U.S. Treasury Long Term Index Fund) and VSBIX (Vanguard Short-Term Treasury Index Fund Institutional Shares) are both Government Bonds funds. Over the past 10 years, PRULX returned -1.14%/yr vs 1.78%/yr for VSBIX. Their 0.60 correlation means they have sometimes moved together and sometimes differently. PRULX charges 0.29%/yr vs 0.05%/yr for VSBIX.
Performance
PRULX vs. VSBIX - 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 VSBIX's 0.86% return. Over the past 10 years, PRULX has underperformed VSBIX with an annualized return of -1.14%, while VSBIX has yielded a comparatively higher 1.78% 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%
VSBIX
- 1D
- 0.07%
- 1M
- 0.15%
- 6M
- 0.67%
- YTD
- 0.86%
- 1Y
- 2.67%
- 3Y*
- 4.35%
- 5Y*
- 1.94%
- 10Y*
- 1.78%
- ALL TIME*
- 1.42%
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. VSBIX - 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% |
VSBIX Vanguard Short-Term Treasury Index Fund Institutional Shares | 0.86% | 5.11% | 4.37% | 4.28% | -3.87% | -0.67% | 3.11% | 3.53% | 1.52% | 0.40% |
Correlation
The correlation between PRULX and VSBIX is 0.65, which is moderate. They have sometimes moved together and sometimes differently, sharing some price drivers without tracking each other closely.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.65 |
Correlation (3Y) Balances recent behavior with more history. | 0.64 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.64 |
Correlation (10Y) Provides a long-term view across more market conditions. | 0.61 |
Correlation (All Time) Calculated using the full available price history since Nov 23, 2009 | 0.60 |
The correlation between PRULX and VSBIX has been stable across timeframes, ranging from 0.60 to 0.65 - a consistent structural relationship.
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Return for Risk
PRULX vs. VSBIX — Risk / Return Rank
PRULX
VSBIX
PRULX vs. VSBIX - 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 Vanguard Short-Term Treasury Index Fund Institutional Shares (VSBIX). 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 | VSBIX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -2.31 | ||
| Sortino ratioReturn per unit of downside risk | -3.38 | ||
| Omega ratioGain probability vs. loss probability | 0.99 | 1.43 | -0.44 |
| Calmar ratioReturn relative to maximum drawdown | -0.10 | 3.32 | -3.42 |
| Martin ratioReturn relative to average drawdown | -0.22 | 13.33 | -13.55 |
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Drawdowns
PRULX vs. VSBIX - Drawdown Comparison
The maximum PRULX drawdown since its inception was -47.40%, which is greater than VSBIX's maximum drawdown of -5.74%. Use the drawdown chart below to compare losses from any high point for PRULX and VSBIX.
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Drawdown Indicators
| PRULX | VSBIX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -47.40% | -5.74% | -41.66% |
Max Drawdown (1Y)Largest decline over 1 year | -7.23% | -0.81% | -6.42% |
Max Drawdown (3Y)Largest decline over 3 years | -13.44% | -0.81% | -12.63% |
Max Drawdown (5Y)Largest decline over 5 years | -42.35% | -5.69% | -36.66% |
Max Drawdown (10Y)Largest decline over 10 years | -47.40% | -5.74% | -41.66% |
Current DrawdownCurrent decline from peak | -38.86% | 0.00% | -38.86% |
Average DrawdownAverage peak-to-trough decline | -9.49% | -0.58% | -8.91% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 3.20% | 0.20% | +3.00% |
Volatility
PRULX vs. VSBIX - Volatility Comparison
T. Rowe Price U.S. Treasury Long Term Index Fund (PRULX) has a higher volatility of 2.27% compared to Vanguard Short-Term Treasury Index Fund Institutional Shares (VSBIX) at 0.35%. This indicates that PRULX's price experiences larger fluctuations and is considered to be riskier than VSBIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| PRULX | VSBIX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 2.27% | 0.35% | +1.92% |
Volatility (6M)Calculated over the trailing 6-month period | 6.53% | 0.99% | +5.54% |
Volatility (1Y)Calculated over the trailing 1-year period | 8.82% | 1.21% | +7.61% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 14.55% | 1.96% | +12.59% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 13.92% | 1.54% | +12.38% |
PRULX vs. VSBIX - Expense Ratio Comparison
PRULX has a 0.29% expense ratio, which is higher than VSBIX's 0.05% expense ratio.
Dividends
PRULX vs. VSBIX - Dividend Comparison
PRULX's dividend yield for the trailing twelve months is around 5.18%, more than VSBIX's 3.82% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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% |
VSBIX Vanguard Short-Term Treasury Index Fund Institutional Shares | 3.82% | 3.99% | 4.52% | 3.31% | 1.14% | 0.65% | 1.74% | 2.28% | 1.81% | 1.11% | 0.80% | 0.74% |
Frequently Asked Questions
PRULX and VSBIX have a correlation of 0.65, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
PRULX has higher volatility (2.27%) compared to VSBIX (0.35%). In terms of maximum drawdown, PRULX dropped -47.40% vs VSBIX's -5.74%.
VSBIX currently has the higher Sharpe Ratio (2.23 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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