BBSOX vs. TRSTX
BBSOX (BlackRock Short Obligations Fund) and TRSTX (T. Rowe Price Ultra Short-Term Bond Fund Class I) are both Ultrashort Bond funds. Over the past 5 years, BBSOX returned 3.31%/yr vs 3.56%/yr for TRSTX. Their 0.41 correlation means their historical movements had little consistent relationship. BBSOX charges 0.30%/yr vs 0.20%/yr for TRSTX.
Performance
BBSOX vs. TRSTX - Performance Comparison
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Returns By Period
The year-to-date returns for both stocks are quite close, with BBSOX having a 1.72% return and TRSTX slightly lower at 1.64%.
BBSOX
- 1D
- 0.00%
- 1M
- 0.00%
- 6M
- 1.37%
- YTD
- 1.72%
- 1Y
- 3.60%
- 3Y*
- 4.68%
- 5Y*
- 3.31%
- 10Y*
- 2.47%
- ALL TIME*
- 2.00%
TRSTX
- 1D
- 0.00%
- 1M
- 0.00%
- 6M
- 1.06%
- YTD
- 1.64%
- 1Y
- 3.67%
- 3Y*
- 5.35%
- 5Y*
- 3.56%
- 10Y*
- —
- ALL TIME*
- 3.22%
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 |
BBSOX vs. TRSTX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | |
|---|---|---|---|---|---|---|---|---|---|
BBSOX BlackRock Short Obligations Fund | 1.72% | 4.74% | 5.36% | 4.36% | 0.60% | -0.10% | 1.54% | 3.01% | 1.73% |
TRSTX T. Rowe Price Ultra Short-Term Bond Fund Class I | 1.64% | 5.34% | 6.41% | 5.89% | -1.20% | 0.29% | 3.19% | 3.65% | 1.60% |
Correlation
The correlation between BBSOX and TRSTX is 0.08, meaning there was essentially no consistent relationship between their historical price movements. Each responded to its own set of market drivers.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.08 |
Correlation (3Y) Balances recent behavior with more history. | 0.31 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.37 |
Correlation (All Time) Calculated using the full available price history since Apr 30, 2018 | 0.41 |
Over the past year, the correlation between BBSOX and TRSTX has dropped to 0.08 - well below their long-term average of 0.41, suggesting their price drivers have been diverging.
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Return for Risk
BBSOX vs. TRSTX — Risk / Return Rank
BBSOX
TRSTX
BBSOX vs. TRSTX - 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 Class I (TRSTX). 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 | TRSTX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.44 | ||
| Sortino ratioReturn per unit of downside risk | +3.42 | ||
| Omega ratioGain probability vs. loss probability | 3.90 | 3.77 | +0.13 |
| Calmar ratioReturn relative to maximum drawdown | 20.77 | 20.32 | +0.45 |
| Martin ratioReturn relative to average drawdown | 65.78 | 44.59 | +21.19 |
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Drawdowns
BBSOX vs. TRSTX - Drawdown Comparison
The maximum BBSOX drawdown since its inception was -1.59%, smaller than the maximum TRSTX drawdown of -4.34%. Use the drawdown chart below to compare losses from any high point for BBSOX and TRSTX.
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Drawdown Indicators
| BBSOX | TRSTX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -1.59% | -4.34% | +2.75% |
Max Drawdown (1Y)Largest decline over 1 year | -0.20% | -0.20% | 0.00% |
Max Drawdown (3Y)Largest decline over 3 years | -0.30% | -0.59% | +0.29% |
Max Drawdown (5Y)Largest decline over 5 years | -1.00% | -2.58% | +1.58% |
Max Drawdown (10Y)Largest decline over 10 years | -1.59% | — | — |
Current DrawdownCurrent decline from peak | -0.10% | 0.00% | -0.10% |
Average DrawdownAverage peak-to-trough decline | -0.08% | -0.30% | +0.22% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.06% | 0.09% | -0.03% |
Volatility
BBSOX vs. TRSTX - Volatility Comparison
The current volatility for BlackRock Short Obligations Fund (BBSOX) is 0.14%, while T. Rowe Price Ultra Short-Term Bond Fund Class I (TRSTX) has a volatility of 0.29%. This indicates that BBSOX experiences smaller price fluctuations and is considered to be less risky than TRSTX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| BBSOX | TRSTX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 0.14% | 0.29% | -0.15% |
Volatility (6M)Calculated over the trailing 6-month period | 0.91% | 1.07% | -0.16% |
Volatility (1Y)Calculated over the trailing 1-year period | 1.30% | 1.52% | -0.22% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 1.27% | 1.66% | -0.39% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 1.03% | 1.61% | -0.58% |
BBSOX vs. TRSTX - Expense Ratio Comparison
BBSOX has a 0.30% expense ratio, which is higher than TRSTX's 0.20% expense ratio.
Dividends
BBSOX vs. TRSTX - Dividend Comparison
BBSOX's dividend yield for the trailing twelve months is around 3.83%, which matches TRSTX's 3.80% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
BBSOX BlackRock Short Obligations Fund | 3.83% | 4.43% | 5.01% | 3.35% | 1.29% | 0.30% | 1.13% | 2.56% | 2.24% | 1.17% | 1.03% | 0.62% |
TRSTX T. Rowe Price Ultra Short-Term Bond Fund Class I | 3.80% | 4.79% | 5.19% | 3.46% | 1.61% | 1.28% | 1.94% | 2.78% | 1.98% | 0.00% | 0.00% | 0.00% |
Frequently Asked Questions
BBSOX and TRSTX have a correlation of 0.08, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
TRSTX has higher volatility (0.29%) compared to BBSOX (0.14%). In terms of maximum drawdown, BBSOX dropped -1.59% vs TRSTX's -4.34%.
BBSOX currently has the higher Sharpe Ratio (3.17 vs 2.73), 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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