TIBAX vs. MFWTX
TIBAX (Thornburg Investment Income Builder Fund) and MFWTX (MFS Global Total Return Fund) are both Global Allocation funds. Over the past 10 years, TIBAX returned 12.70%/yr vs 6.44%/yr for MFWTX. Their correlation of 0.83 suggests significant overlap in exposure. TIBAX charges 1.14%/yr vs 1.09%/yr for MFWTX.
Performance
TIBAX vs. MFWTX - Performance Comparison
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Returns By Period
In the year-to-date period, TIBAX achieves a 17.44% return, which is significantly higher than MFWTX's 4.62% return. Over the past 10 years, TIBAX has outperformed MFWTX with an annualized return of 12.70%, while MFWTX has yielded a comparatively lower 6.44% annualized return.
TIBAX
- 1D
- -0.10%
- 1M
- 0.51%
- YTD
- 17.44%
- 6M
- 18.19%
- 1Y
- 36.96%
- 3Y*
- 26.02%
- 5Y*
- 16.24%
- 10Y*
- 12.70%
MFWTX
- 1D
- -0.11%
- 1M
- -0.06%
- YTD
- 4.62%
- 6M
- 4.44%
- 1Y
- 12.65%
- 3Y*
- 10.35%
- 5Y*
- 4.89%
- 10Y*
- 6.44%
TIBAX vs. MFWTX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
TIBAX Thornburg Investment Income Builder Fund | 17.44% | 36.62% | 13.23% | 18.01% | -7.95% | 20.08% | -0.67% | 17.72% | -4.54% | 14.83% |
MFWTX MFS Global Total Return Fund | 4.62% | 15.48% | 3.92% | 10.29% | -10.86% | 8.31% | 9.35% | 18.25% | -7.19% | 14.77% |
Correlation
The correlation between TIBAX and MFWTX is 0.71, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.71 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.78 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.82 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.83 |
Correlation (All Time) Calculated using the full available price history since Dec 24, 2002 | 0.83 |
The correlation between TIBAX and MFWTX shifts across timeframes, from 0.71 (1 year) to 0.83 (10 years), reflecting how their relationship changes across market environments.
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Return for Risk
TIBAX vs. MFWTX — Risk / Return Rank
TIBAX
MFWTX
TIBAX vs. MFWTX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Thornburg Investment Income Builder Fund (TIBAX) and MFS Global Total Return Fund (MFWTX). 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.
| TIBAX | MFWTX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +2.51 | ||
| Sortino ratioReturn per unit of downside risk | +3.47 | ||
| Omega ratioGain probability vs. loss probability | 1.85 | 1.32 | +0.53 |
| Calmar ratioReturn relative to maximum drawdown | 6.86 | 1.97 | +4.89 |
| Martin ratioReturn relative to average drawdown | 26.22 | 6.93 | +19.29 |
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Drawdowns
TIBAX vs. MFWTX - Drawdown Comparison
The maximum TIBAX drawdown since its inception was -49.12%, which is greater than MFWTX's maximum drawdown of -33.22%. Use the drawdown chart below to compare losses from any high point for TIBAX and MFWTX.
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Drawdown Indicators
| TIBAX | MFWTX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -49.12% | -33.22% | -15.90% |
Max Drawdown (1Y)Largest decline over 1 year | -5.43% | -6.72% | +1.29% |
Max Drawdown (3Y)Largest decline over 3 years | -9.20% | -8.68% | -0.52% |
Max Drawdown (5Y)Largest decline over 5 years | -20.94% | -20.36% | -0.58% |
Max Drawdown (10Y)Largest decline over 10 years | -34.85% | -23.37% | -11.48% |
Current DrawdownCurrent decline from peak | -0.40% | -1.73% | +1.33% |
Average DrawdownAverage peak-to-trough decline | -5.98% | -3.55% | -2.43% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.42% | 1.90% | -0.48% |
Volatility
TIBAX vs. MFWTX - Volatility Comparison
Thornburg Investment Income Builder Fund (TIBAX) has a higher volatility of 2.87% compared to MFS Global Total Return Fund (MFWTX) at 2.21%. This indicates that TIBAX's price experiences larger fluctuations and is considered to be riskier than MFWTX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| TIBAX | MFWTX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 2.87% | 2.21% | +0.66% |
Volatility (6M)Calculated over the trailing 6-month period | 7.32% | 5.90% | +1.42% |
Volatility (1Y)Calculated over the trailing 1-year period | 8.76% | 7.58% | +1.18% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 11.15% | 9.14% | +2.01% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 13.46% | 9.63% | +3.83% |
TIBAX vs. MFWTX - Expense Ratio Comparison
TIBAX has a 1.14% expense ratio, which is higher than MFWTX's 1.09% expense ratio.
Dividends
TIBAX vs. MFWTX - Dividend Comparison
TIBAX's dividend yield for the trailing twelve months is around 4.93%, less than MFWTX's 8.04% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
MFWTX MFS Global Total Return Fund | 8.04% | 8.42% | 8.94% | 3.69% | 2.64% | 10.29% | 7.20% | 4.41% | 3.33% | 2.17% | 1.13% | 4.29% |
TIBAX Thornburg Investment Income Builder Fund | 4.93% | 5.64% | 5.44% | 4.67% | 5.62% | 5.10% | 4.11% | 4.23% | 4.49% | 4.22% | 3.83% | 4.31% |
Frequently Asked Questions
TIBAX and MFWTX have a correlation of 0.71, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
TIBAX has higher volatility (2.87%) compared to MFWTX (2.21%). In terms of maximum drawdown, TIBAX dropped -49.12% vs MFWTX's -33.22%.
TIBAX currently has the higher Sharpe Ratio (4.26 vs 1.75), 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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