MDY vs. AGG
MDY (SPDR S&P MidCap 400 ETF) and AGG (iShares Core U.S. Aggregate Bond ETF) are both exchange-traded funds - MDY is a Mid Cap Blend Equities fund tracking the S&P MidCap 400 Index, while AGG is a Total Bond Market fund tracking the Bloomberg U.S. Aggregate Bond Index. Both are passively managed. Over the past 10 years, MDY returned 11.33%/yr vs 1.57%/yr for AGG. At a correlation of -0.10, they often move in opposite directions. MDY charges 0.23%/yr vs 0.03%/yr for AGG.
Performance
MDY vs. AGG - Performance Comparison
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Returns By Period
In the year-to-date period, MDY achieves a 15.28% return, which is significantly higher than AGG's 0.52% return. Over the past 10 years, MDY has outperformed AGG with an annualized return of 11.33%, while AGG has yielded a comparatively lower 1.57% annualized return.
MDY
- 1D
- 0.71%
- 1M
- 3.51%
- YTD
- 15.28%
- 6M
- 13.84%
- 1Y
- 27.52%
- 3Y*
- 15.07%
- 5Y*
- 7.99%
- 10Y*
- 11.33%
AGG
- 1D
- -0.12%
- 1M
- 0.46%
- YTD
- 0.52%
- 6M
- 0.93%
- 1Y
- 4.87%
- 3Y*
- 4.19%
- 5Y*
- 0.06%
- 10Y*
- 1.57%
MDY vs. AGG - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
MDY SPDR S&P MidCap 400 ETF | 15.28% | 7.19% | 13.64% | 16.07% | -13.28% | 24.53% | 13.50% | 25.78% | -11.29% | 15.93% |
AGG iShares Core U.S. Aggregate Bond ETF | 0.52% | 7.19% | 1.31% | 5.65% | -13.02% | -1.77% | 7.48% | 8.46% | 0.09% | 3.55% |
Correlation
The correlation between MDY and AGG is 0.38, which is low. Their price movements are largely independent, making them effective diversification partners.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.38 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.28 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.18 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.05 |
Correlation (All Time) Calculated using the full available price history since Sep 26, 2003 | -0.10 |
The correlation between MDY and AGG shifts across timeframes, from -0.10 (all time) to 0.38 (1 year), reflecting how their relationship changes across market environments.
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Return for Risk
MDY vs. AGG — Risk / Return Rank
MDY
AGG
MDY vs. AGG - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for SPDR S&P MidCap 400 ETF (MDY) and iShares Core U.S. Aggregate Bond ETF (AGG). 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.
| MDY | AGG | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.44 | ||
| Sortino ratioReturn per unit of downside risk | +0.61 | ||
| Omega ratioGain probability vs. loss probability | 1.29 | 1.21 | +0.08 |
| Calmar ratioReturn relative to maximum drawdown | 2.91 | 1.63 | +1.28 |
| Martin ratioReturn relative to average drawdown | 10.60 | 4.82 | +5.78 |
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Drawdowns
MDY vs. AGG - Drawdown Comparison
The maximum MDY drawdown since its inception was -55.33%, which is greater than AGG's maximum drawdown of -18.43%. Use the drawdown chart below to compare losses from any high point for MDY and AGG.
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Drawdown Indicators
| MDY | AGG | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -55.33% | -18.43% | -36.90% |
Max Drawdown (1Y)Largest decline over 1 year | -8.82% | -2.76% | -6.06% |
Max Drawdown (3Y)Largest decline over 3 years | -24.03% | -6.11% | -17.92% |
Max Drawdown (5Y)Largest decline over 5 years | -24.03% | -17.82% | -6.21% |
Max Drawdown (10Y)Largest decline over 10 years | -42.22% | -18.43% | -23.79% |
Current DrawdownCurrent decline from peak | 0.00% | -1.88% | +1.88% |
Average DrawdownAverage peak-to-trough decline | -7.02% | -2.71% | -4.31% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 2.42% | 0.94% | +1.48% |
Volatility
MDY vs. AGG - Volatility Comparison
SPDR S&P MidCap 400 ETF (MDY) has a higher volatility of 5.04% compared to iShares Core U.S. Aggregate Bond ETF (AGG) at 1.37%. This indicates that MDY's price experiences larger fluctuations and is considered to be riskier than AGG based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| MDY | AGG | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 5.04% | 1.37% | +3.67% |
Volatility (6M)Calculated over the trailing 6-month period | 11.68% | 2.81% | +8.87% |
Volatility (1Y)Calculated over the trailing 1-year period | 15.83% | 3.82% | +12.01% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 19.82% | 6.09% | +13.73% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 21.21% | 5.41% | +15.80% |
MDY vs. AGG - Expense Ratio Comparison
MDY has a 0.23% expense ratio, which is higher than AGG's 0.03% 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
MDY vs. AGG - Dividend Comparison
MDY's dividend yield for the trailing twelve months is around 1.03%, less than AGG's 3.98% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
AGG iShares Core U.S. Aggregate Bond ETF | 3.98% | 3.89% | 3.74% | 3.13% | 2.39% | 1.77% | 2.14% | 2.70% | 2.72% | 2.32% | 2.39% | 2.45% |
MDY SPDR S&P MidCap 400 ETF | 1.03% | 1.15% | 1.18% | 1.21% | 1.37% | 0.96% | 1.12% | 1.34% | 1.39% | 1.18% | 1.31% | 1.35% |
Frequently Asked Questions
MDY and AGG have a correlation of 0.38, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
MDY has higher volatility (5.04%) compared to AGG (1.37%). In terms of maximum drawdown, MDY dropped -55.33% vs AGG's -18.43%.
On 10-year performance, MDY leads with 11.33% vs 1.57% for AGG. On fees, AGG is cheaper at 0.03% per year. On volatility, AGG has been the lower-risk option at 1.37%. The better choice depends on whether you care most about return, fees, risk, or income.
Over the 10-year period, MDY has performed better with a 11.33% return vs 1.57%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.
AGG is cheaper with a 0.03% expense ratio, compared with 0.23% for MDY.
AGG has the higher dividend yield at 3.98%, compared with 1.03% for MDY.
MDY is categorized as Mid Cap Blend Equities, while AGG is Total Bond Market. MDY tracks S&P MidCap 400 Index, while AGG tracks Bloomberg U.S. Aggregate Bond Index. They also come from different issuers: State Street and iShares. Their fees differ too: 0.23% for MDY and 0.03% for AGG.
MDY currently has the higher Sharpe Ratio (1.62 vs 1.19), 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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