SPY vs. IUSB
SPY (State Street SPDR S&P 500 ETF) and IUSB (iShares Core Universal USD Bond ETF) are both exchange-traded funds - SPY is a S&P 500 fund tracking the S&P 500 Index, while IUSB is a Intermediate Core-Plus Bond fund tracking the Bloomberg U.S. Universal Index. Both are passively managed. Over the past 10 years, SPY returned 15.42%/yr vs 1.97%/yr for IUSB. At a 0.07 correlation, their price movements are largely independent. SPY charges 0.09%/yr vs 0.06%/yr for IUSB.
Performance
SPY vs. IUSB - Performance Comparison
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Returns By Period
In the year-to-date period, SPY achieves a 9.07% return, which is significantly higher than IUSB's 0.67% return. Over the past 10 years, SPY has outperformed IUSB with an annualized return of 15.42%, while IUSB has yielded a comparatively lower 1.97% annualized return.
SPY
- 1D
- 0.54%
- 1M
- 0.35%
- YTD
- 9.07%
- 6M
- 9.42%
- 1Y
- 25.67%
- 3Y*
- 20.86%
- 5Y*
- 13.36%
- 10Y*
- 15.42%
IUSB
- 1D
- -0.07%
- 1M
- 1.10%
- YTD
- 0.67%
- 6M
- 1.05%
- 1Y
- 5.21%
- 3Y*
- 4.70%
- 5Y*
- 0.39%
- 10Y*
- 1.97%
SPY vs. IUSB - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
SPY State Street SPDR S&P 500 ETF | 9.07% | 17.72% | 24.89% | 26.18% | -18.18% | 28.73% | 18.33% | 31.22% | -4.57% | 21.71% |
IUSB iShares Core Universal USD Bond ETF | 0.67% | 7.38% | 2.11% | 6.23% | -13.04% | -1.33% | 7.62% | 9.13% | -0.27% | 3.82% |
Correlation
The correlation between SPY and IUSB is 0.37, which is low. Their price movements are largely independent, making them effective diversification partners.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.37 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.27 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.23 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.11 |
Correlation (All Time) Calculated using the full available price history since Jun 12, 2014 | 0.07 |
Over the past year, SPY and IUSB have become more correlated (0.37) than their long-term average of 0.07, meaning their price movements have been converging.
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Return for Risk
SPY vs. IUSB — Risk / Return Rank
SPY
IUSB
SPY vs. IUSB - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for State Street SPDR S&P 500 ETF (SPY) and iShares Core Universal USD Bond ETF (IUSB). 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.
| SPY | IUSB | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.63 | ||
| Sortino ratioReturn per unit of downside risk | +0.66 | ||
| Omega ratioGain probability vs. loss probability | 1.36 | 1.24 | +0.12 |
| Calmar ratioReturn relative to maximum drawdown | 2.74 | 1.92 | +0.83 |
| Martin ratioReturn relative to average drawdown | 12.39 | 5.62 | +6.77 |
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Drawdowns
SPY vs. IUSB - Drawdown Comparison
The maximum SPY drawdown since its inception was -55.19%, which is greater than IUSB's maximum drawdown of -17.90%. Use the drawdown chart below to compare losses from any high point for SPY and IUSB.
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Drawdown Indicators
| SPY | IUSB | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -55.19% | -17.90% | -37.29% |
Max Drawdown (1Y)Largest decline over 1 year | -8.88% | -2.53% | -6.35% |
Max Drawdown (3Y)Largest decline over 3 years | -18.76% | -5.82% | -12.94% |
Max Drawdown (5Y)Largest decline over 5 years | -24.50% | -17.87% | -6.63% |
Max Drawdown (10Y)Largest decline over 10 years | -33.72% | -17.90% | -15.82% |
Current DrawdownCurrent decline from peak | -2.35% | -1.09% | -1.26% |
Average DrawdownAverage peak-to-trough decline | -9.04% | -3.58% | -5.46% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.97% | 0.86% | +1.11% |
Volatility
SPY vs. IUSB - Volatility Comparison
State Street SPDR S&P 500 ETF (SPY) has a higher volatility of 4.34% compared to iShares Core Universal USD Bond ETF (IUSB) at 1.30%. This indicates that SPY's price experiences larger fluctuations and is considered to be riskier than IUSB based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| SPY | IUSB | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 4.34% | 1.30% | +3.04% |
Volatility (6M)Calculated over the trailing 6-month period | 9.58% | 2.69% | +6.89% |
Volatility (1Y)Calculated over the trailing 1-year period | 12.29% | 3.59% | +8.70% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 17.12% | 5.80% | +11.32% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 17.96% | 5.04% | +12.92% |
SPY vs. IUSB - Expense Ratio Comparison
SPY has a 0.09% expense ratio, which is higher than IUSB's 0.06% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.
Dividends
SPY vs. IUSB - Dividend Comparison
SPY's dividend yield for the trailing twelve months is around 1.00%, less than IUSB's 4.22% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
IUSB iShares Core Universal USD Bond ETF | 4.22% | 4.17% | 4.04% | 3.46% | 2.53% | 1.74% | 2.68% | 3.04% | 2.98% | 2.56% | 2.60% | 1.95% |
SPY State Street SPDR S&P 500 ETF | 1.00% | 1.07% | 1.21% | 1.40% | 1.65% | 1.20% | 1.52% | 1.75% | 2.04% | 1.80% | 2.03% | 2.06% |
Frequently Asked Questions
SPY and IUSB have a correlation of 0.37, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
SPY has higher volatility (4.34%) compared to IUSB (1.30%). In terms of maximum drawdown, SPY dropped -55.19% vs IUSB's -17.90%.
On 10-year performance, SPY leads with 15.42% vs 1.97% for IUSB. On fees, IUSB is cheaper at 0.06% per year. On volatility, IUSB has been the lower-risk option at 1.30%. The better choice depends on whether you care most about return, fees, risk, or income.
Over the 10-year period, SPY has performed better with a 15.42% return vs 1.97%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.
IUSB is cheaper with a 0.06% expense ratio, compared with 0.09% for SPY.
IUSB has the higher dividend yield at 4.22%, compared with 1.00% for SPY.
SPY is categorized as S&P 500, while IUSB is Intermediate Core-Plus Bond. SPY tracks S&P 500 Index, while IUSB tracks Bloomberg U.S. Universal Index. They also come from different issuers: State Street and iShares. Their fees differ too: 0.09% for SPY and 0.06% for IUSB.
SPY currently has the higher Sharpe Ratio (1.98 vs 1.35), 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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