SPAB vs. BTOT
SPAB (SPDR Portfolio Aggregate Bond ETF) and BTOT (iShares Total USD Fixed Income Market ETF) are both Total Bond Market funds - SPAB tracks the Bloomberg U.S. Aggregate Bond Index while BTOT tracks the Bloomberg US Total Fixed Income Market Index. Both are passively managed. Their 0.96 correlation means they have historically moved very closely together. SPAB charges 0.03%/yr vs 0.09%/yr for BTOT.
Performance
SPAB vs. BTOT - Performance Comparison
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Returns By Period
In the year-to-date period, SPAB achieves a -0.51% return, which is significantly lower than BTOT's -0.32% return.
SPAB
- 1D
- -0.20%
- 1M
- -1.14%
- 6M
- -0.78%
- YTD
- -0.51%
- 1Y
- 1.84%
- 3Y*
- 3.92%
- 5Y*
- -0.41%
- 10Y*
- 1.33%
- ALL TIME*
- 3.02%
BTOT
- 1D
- -0.23%
- 1M
- -1.14%
- 6M
- -0.56%
- YTD
- -0.32%
- 1Y
- —
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
- ALL TIME*
- —
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $29.60K | $46.79K | $74.77K | |
| $45.27M | $52.69M | $59.67M |
SPAB vs. BTOT - Yearly Performance Comparison
| 2026 (YTD) | 2025 | |
|---|---|---|
SPAB SPDR Portfolio Aggregate Bond ETF | -0.51% | 0.08% |
BTOT iShares Total USD Fixed Income Market ETF | -0.32% | 0.12% |
Correlation
The correlation between SPAB and BTOT is 0.96 - they have historically moved very closely together. At this level, their price movements offset little of one another.
| Correlation | |
|---|---|
Correlation (All Time) Calculated using the full available price history since Dec 11, 2025 | 0.96 |
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Return for Risk
SPAB vs. BTOT — Risk / Return Rank
SPAB
BTOT
Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.
SPAB vs. BTOT - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for SPDR Portfolio Aggregate Bond ETF (SPAB) and iShares Total USD Fixed Income Market ETF (BTOT). 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.
| SPAB | BTOT | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | — | — | |
| Sortino ratioReturn per unit of downside risk | — | — | |
| Omega ratioGain probability vs. loss probability | 1.13 | — | — |
| Calmar ratioReturn relative to maximum drawdown | 1.01 | — | — |
| Martin ratioReturn relative to average drawdown | 2.47 | — | — |
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Drawdowns
SPAB vs. BTOT - Drawdown Comparison
The maximum SPAB drawdown since its inception was -18.56%, which is greater than BTOT's maximum drawdown of -2.36%. Use the drawdown chart below to compare losses from any high point for SPAB and BTOT.
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Drawdown Indicators
| SPAB | BTOT | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -18.56% | -2.36% | -16.20% |
Max Drawdown (1Y)Largest decline over 1 year | -2.74% | — | — |
Max Drawdown (3Y)Largest decline over 3 years | -4.93% | — | — |
Max Drawdown (5Y)Largest decline over 5 years | -17.93% | — | — |
Max Drawdown (10Y)Largest decline over 10 years | -18.56% | — | — |
Current DrawdownCurrent decline from peak | -3.05% | -1.89% | -1.16% |
Average DrawdownAverage peak-to-trough decline | -3.07% | -0.86% | -2.21% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.12% | — | — |
Volatility
SPAB vs. BTOT - Volatility Comparison
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Volatility by Period
| SPAB | BTOT | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.01% | — | — |
Volatility (6M)Calculated over the trailing 6-month period | 2.85% | — | — |
Volatility (1Y)Calculated over the trailing 1-year period | 3.69% | 3.62% | +0.07% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 5.93% | 3.62% | +2.31% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.55% | 3.62% | +1.93% |
SPAB vs. BTOT - Expense Ratio Comparison
SPAB has a 0.03% expense ratio, which is lower than BTOT's 0.09% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.
Dividends
SPAB vs. BTOT - Dividend Comparison
SPAB's dividend yield for the trailing twelve months is around 4.11%, more than BTOT's 2.52% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
BTOT iShares Total USD Fixed Income Market ETF | 2.52% | 0.22% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
SPAB SPDR Portfolio Aggregate Bond ETF | 3.77% | 3.97% | 3.86% | 3.34% | 2.59% | 2.11% | 2.43% | 2.92% | 2.96% | 2.67% | 2.63% | 2.59% |
Frequently Asked Questions
With a correlation of 0.96, SPAB and BTOT move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.
On fees, SPAB is cheaper at 0.03% per year. The better choice depends on whether you care most about return, fees, risk, or income.
SPAB is cheaper with a 0.03% expense ratio, compared with 0.09% for BTOT.
SPAB has the higher dividend yield at 3.77%, compared with 2.52% for BTOT.
SPAB tracks Bloomberg U.S. Aggregate Bond Index, while BTOT tracks Bloomberg US Total Fixed Income Market Index. They also come from different issuers: State Street and iShares. Their fees differ too: 0.03% for SPAB and 0.09% for BTOT.
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