MIAIX vs. SWRSX
MIAIX (MFS Inflation-Adjusted Bond Fund) and SWRSX (Schwab Treasury Inflation Protected Securities Index Fund) are both Inflation-Protected Bonds funds. Over the past 10 years, MIAIX returned 1.81%/yr vs 2.40%/yr for SWRSX. Their 0.95 correlation means they have historically moved very closely together. MIAIX charges 0.49%/yr vs 0.05%/yr for SWRSX.
Performance
MIAIX vs. SWRSX - Performance Comparison
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Returns By Period
In the year-to-date period, MIAIX achieves a 0.12% return, which is significantly lower than SWRSX's 0.70% return. Over the past 10 years, MIAIX has underperformed SWRSX with an annualized return of 1.81%, while SWRSX has yielded a comparatively higher 2.40% annualized return.
MIAIX
- 1D
- 0.00%
- 1M
- -0.56%
- 6M
- -0.32%
- YTD
- 0.12%
- 1Y
- 1.11%
- 3Y*
- 2.92%
- 5Y*
- -0.39%
- 10Y*
- 1.81%
- ALL TIME*
- 2.79%
SWRSX
- 1D
- 0.00%
- 1M
- -0.49%
- 6M
- 0.22%
- YTD
- 0.70%
- 1Y
- 2.04%
- 3Y*
- 3.69%
- 5Y*
- 0.31%
- 10Y*
- 2.40%
- ALL TIME*
- 3.30%
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 |
MIAIX vs. SWRSX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
MIAIX MFS Inflation-Adjusted Bond Fund | 0.12% | 5.89% | 1.66% | 2.15% | -11.87% | 4.64% | 10.56% | 8.03% | -1.83% | 2.56% |
SWRSX Schwab Treasury Inflation Protected Securities Index Fund | 0.70% | 6.84% | 1.95% | 3.80% | -12.01% | 5.83% | 10.88% | 8.38% | -1.32% | 2.69% |
Correlation
The correlation between MIAIX and SWRSX is 0.93, meaning they have usually moved in the same direction, including during past declines.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.93 |
Correlation (3Y) Balances recent behavior with more history. | 0.94 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.95 |
Correlation (10Y) Provides a long-term view across more market conditions. | 0.95 |
Correlation (All Time) Calculated using the full available price history since Apr 3, 2006 | 0.96 |
The correlation between MIAIX and SWRSX has been stable across timeframes, ranging from 0.93 to 0.95 - a consistent structural relationship.
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Return for Risk
MIAIX vs. SWRSX — Risk / Return Rank
MIAIX
SWRSX
MIAIX vs. SWRSX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for MFS Inflation-Adjusted Bond Fund (MIAIX) and Schwab Treasury Inflation Protected Securities Index Fund (SWRSX). 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.
| MIAIX | SWRSX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.32 | ||
| Sortino ratioReturn per unit of downside risk | -0.48 | ||
| Omega ratioGain probability vs. loss probability | 1.08 | 1.14 | -0.06 |
| Calmar ratioReturn relative to maximum drawdown | 0.77 | 1.34 | -0.57 |
| Martin ratioReturn relative to average drawdown | 1.93 | 3.65 | -1.72 |
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Drawdowns
MIAIX vs. SWRSX - Drawdown Comparison
The maximum MIAIX drawdown since its inception was -15.99%, which is greater than SWRSX's maximum drawdown of -14.29%. Use the drawdown chart below to compare losses from any high point for MIAIX and SWRSX.
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Drawdown Indicators
| MIAIX | SWRSX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -15.99% | -14.29% | -1.70% |
Max Drawdown (1Y)Largest decline over 1 year | -2.18% | -1.90% | -0.28% |
Max Drawdown (3Y)Largest decline over 3 years | -4.70% | -3.96% | -0.74% |
Max Drawdown (5Y)Largest decline over 5 years | -15.99% | -14.29% | -1.70% |
Max Drawdown (10Y)Largest decline over 10 years | -15.99% | -14.29% | -1.70% |
Current DrawdownCurrent decline from peak | -3.49% | -1.09% | -2.40% |
Average DrawdownAverage peak-to-trough decline | -4.24% | -3.70% | -0.54% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.86% | 0.70% | +0.16% |
Volatility
MIAIX vs. SWRSX - Volatility Comparison
MFS Inflation-Adjusted Bond Fund (MIAIX) and Schwab Treasury Inflation Protected Securities Index Fund (SWRSX) have volatilities of 0.75% and 0.77%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| MIAIX | SWRSX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 0.75% | 0.77% | -0.02% |
Volatility (6M)Calculated over the trailing 6-month period | 2.61% | 2.38% | +0.23% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.51% | 3.18% | +0.33% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.17% | 6.01% | +0.16% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.48% | 5.36% | +0.12% |
MIAIX vs. SWRSX - Expense Ratio Comparison
MIAIX has a 0.49% expense ratio, which is higher than SWRSX's 0.05% expense ratio.
Dividends
MIAIX vs. SWRSX - Dividend Comparison
MIAIX's dividend yield for the trailing twelve months is around 4.43%, which matches SWRSX's 4.44% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
MIAIX MFS Inflation-Adjusted Bond Fund | 4.43% | 4.10% | 4.10% | 4.00% | 7.96% | 5.10% | 1.45% | 2.18% | 2.85% | 2.14% | 1.82% | 0.67% |
SWRSX Schwab Treasury Inflation Protected Securities Index Fund | 4.44% | 4.20% | 3.68% | 3.11% | 7.95% | 4.45% | 1.33% | 2.20% | 2.87% | 1.75% | 1.81% | 1.06% |
Frequently Asked Questions
With a correlation of 0.93, MIAIX and SWRSX 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.
SWRSX has higher volatility (0.77%) compared to MIAIX (0.75%). In terms of maximum drawdown, MIAIX dropped -15.99% vs SWRSX's -14.29%.
SWRSX currently has the higher Sharpe Ratio (0.80 vs 0.48), 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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