BBSOX vs. TRBUX
BBSOX (BlackRock Short Obligations Fund) and TRBUX (T. Rowe Price Ultra Short-Term Bond Fund) are both Ultrashort Bond funds. Over the past 10 years, BBSOX returned 2.48%/yr vs 3.92%/yr for TRBUX. At a 0.38 correlation, their price movements are largely independent. BBSOX charges 0.30%/yr vs 0.31%/yr for TRBUX.
Performance
BBSOX vs. TRBUX - Performance Comparison
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Returns By Period
In the year-to-date period, BBSOX achieves a 1.72% return, which is significantly lower than TRBUX's 2.12% return. Over the past 10 years, BBSOX has underperformed TRBUX with an annualized return of 2.48%, while TRBUX has yielded a comparatively higher 3.92% annualized return.
BBSOX
- 1D
- 0.00%
- 1M
- 0.23%
- 6M
- 1.72%
- YTD
- 1.72%
- 1Y
- 4.10%
- 3Y*
- 4.85%
- 5Y*
- 3.32%
- 10Y*
- 2.48%
TRBUX
- 1D
- 0.00%
- 1M
- 0.17%
- 6M
- 2.12%
- YTD
- 2.12%
- 1Y
- 4.94%
- 3Y*
- 8.42%
- 5Y*
- 5.61%
- 10Y*
- 3.92%
BBSOX vs. TRBUX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
BBSOX BlackRock Short Obligations Fund | 1.72% | 4.74% | 5.36% | 4.36% | 0.60% | -0.10% | 1.54% | 3.01% | 1.96% | 1.18% |
TRBUX T. Rowe Price Ultra Short-Term Bond Fund | 2.12% | 6.49% | 11.12% | 10.12% | -1.28% | 0.22% | 3.11% | 3.60% | 1.88% | 1.83% |
Correlation
The correlation between BBSOX and TRBUX is 0.24, which is low. Their price movements are largely independent, making them effective diversification partners.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.24 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.32 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.35 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.37 |
Correlation (All Time) Calculated using the full available price history since Oct 3, 2013 | 0.38 |
The correlation between BBSOX and TRBUX shifts across timeframes, from 0.24 (1 year) to 0.38 (all time), reflecting how their relationship changes across market environments.
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Return for Risk
BBSOX vs. TRBUX — Risk / Return Rank
BBSOX
TRBUX
BBSOX vs. TRBUX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for BlackRock Short Obligations Fund (BBSOX) and T. Rowe Price Ultra Short-Term Bond Fund (TRBUX). 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.
| BBSOX | TRBUX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.16 | ||
| Sortino ratioReturn per unit of downside risk | +3.95 | ||
| Omega ratioGain probability vs. loss probability | 3.90 | 2.89 | +1.01 |
| Calmar ratioReturn relative to maximum drawdown | 20.77 | 12.99 | +7.78 |
| Martin ratioReturn relative to average drawdown | 70.95 | 48.41 | +22.54 |
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Drawdowns
BBSOX vs. TRBUX - Drawdown Comparison
The maximum BBSOX drawdown since its inception was -1.59%, smaller than the maximum TRBUX drawdown of -4.15%. Use the drawdown chart below to compare losses from any high point for BBSOX and TRBUX.
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Drawdown Indicators
| BBSOX | TRBUX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -1.59% | -4.15% | +2.56% |
Max Drawdown (1Y)Largest decline over 1 year | -0.20% | -0.39% | +0.19% |
Max Drawdown (3Y)Largest decline over 3 years | -0.30% | -0.78% | +0.48% |
Max Drawdown (5Y)Largest decline over 5 years | -1.00% | -2.66% | +1.66% |
Max Drawdown (10Y)Largest decline over 10 years | -1.59% | -4.15% | +2.56% |
Current DrawdownCurrent decline from peak | -0.10% | -0.20% | +0.10% |
Average DrawdownAverage peak-to-trough decline | -0.08% | -0.21% | +0.13% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.06% | 0.11% | -0.05% |
Volatility
BBSOX vs. TRBUX - Volatility Comparison
The current volatility for BlackRock Short Obligations Fund (BBSOX) is 0.40%, while T. Rowe Price Ultra Short-Term Bond Fund (TRBUX) has a volatility of 0.61%. This indicates that BBSOX experiences smaller price fluctuations and is considered to be less risky than TRBUX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| BBSOX | TRBUX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 0.40% | 0.61% | -0.21% |
Volatility (6M)Calculated over the trailing 6-month period | 0.91% | 1.28% | -0.37% |
Volatility (1Y)Calculated over the trailing 1-year period | 1.30% | 1.70% | -0.40% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 1.27% | 1.81% | -0.54% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 1.03% | 1.58% | -0.55% |
BBSOX vs. TRBUX - Expense Ratio Comparison
BBSOX has a 0.30% expense ratio, which is lower than TRBUX's 0.31% expense ratio.
Dividends
BBSOX vs. TRBUX - Dividend Comparison
BBSOX's dividend yield for the trailing twelve months is around 4.21%, less than TRBUX's 4.82% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
BBSOX BlackRock Short Obligations Fund | 4.21% | 4.43% | 5.01% | 3.35% | 1.29% | 0.30% | 1.13% | 2.56% | 2.24% | 1.17% | 1.03% | 0.62% |
TRBUX T. Rowe Price Ultra Short-Term Bond Fund | 4.82% | 5.86% | 9.30% | 7.34% | 1.53% | 1.21% | 1.86% | 2.73% | 2.47% | 1.62% | 1.18% | 0.81% |
Frequently Asked Questions
BBSOX and TRBUX 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.
TRBUX has higher volatility (0.61%) compared to BBSOX (0.40%). In terms of maximum drawdown, BBSOX dropped -1.59% vs TRBUX's -4.15%.
BBSOX currently has the higher Sharpe Ratio (3.17 vs 3.01), 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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