THIMX vs. TSIIX

Last updated Jun 4, 2026

THIMX (Thornburg Intermediate Municipal Fund) and TSIIX (Thornburg Strategic Income Fund) are both mutual funds - THIMX is a Municipal Bonds fund managed by Thornburg, while TSIIX is a Multisector Bonds fund managed by Thornburg. Over the past 10 years, THIMX returned 2.00%/yr vs 4.31%/yr for TSIIX. At a 0.34 correlation, their price movements are largely independent. THIMX charges 0.77%/yr vs 0.60%/yr for TSIIX.

Performance

THIMX vs. TSIIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Thornburg Intermediate Municipal Fund (THIMX) and Thornburg Strategic Income Fund (TSIIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, THIMX achieves a 1.61% return, which is significantly higher than TSIIX's 0.90% return. Over the past 10 years, THIMX has underperformed TSIIX with an annualized return of 2.00%, while TSIIX has yielded a comparatively higher 4.31% annualized return.

THIMX

• 1D: 0.15%
• 1M: 0.68%
• YTD: 1.61%
• 6M: 1.77%
• 1Y: 6.42%
• 3Y*: 4.48%
• 5Y*: 1.60%
• 10Y*: 2.00%

TSIIX

• 1D: 0.09%
• 1M: 0.51%
• YTD: 0.90%
• 6M: 1.15%
• 1Y: 5.71%
• 3Y*: 5.90%
• 5Y*: 3.04%
• 10Y*: 4.31%

*Multi-year figures are annualized to reflect compound growth (CAGR)

THIMX vs. TSIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
THIMX Thornburg Intermediate Municipal Fund	1.61%	5.97%	2.45%	4.88%	-6.63%	1.00%	3.81%	5.86%	0.70%	3.61%
TSIIX Thornburg Strategic Income Fund	0.90%	7.58%	4.85%	7.63%	-6.44%	2.80%	8.27%	7.92%	0.70%	6.48%

Correlation

The correlation between THIMX and TSIIX is 0.55, 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	0.55
Correlation (3Y) Calculated over the trailing 3-year period	0.61
Correlation (5Y) Calculated over the trailing 5-year period	0.58
Correlation (10Y) Calculated over the trailing 10-year period	0.49
Correlation (All Time) Calculated using the full available price history since Dec 20, 2007	0.34

Over the past year, THIMX and TSIIX have become more correlated (0.55) than their long-term average of 0.34, meaning their price movements have been converging.

Return for Risk

THIMX vs. TSIIX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

THIMX

THIMX Risk / Return Rank: 74
THIMX Sharpe Ratio Rank: 88
THIMX Sortino Ratio Rank: 94
THIMX Omega Ratio Rank: 96
THIMX Calmar Ratio Rank: 49
THIMX Martin Ratio Rank: 46

TSIIX

TSIIX Risk / Return Rank: 49
TSIIX Sharpe Ratio Rank: 47
TSIIX Sortino Ratio Rank: 60
TSIIX Omega Ratio Rank: 49
TSIIX Calmar Ratio Rank: 48
TSIIX Martin Ratio Rank: 44

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

THIMX vs. TSIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Thornburg Intermediate Municipal Fund (THIMX) and Thornburg Strategic Income Fund (TSIIX). 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.

	THIMX	TSIIX	Difference
Sharpe ratio: Return per unit of total volatility	2.87	2.00	+0.87
Sortino ratio: Return per unit of downside risk	4.84	3.25	+1.59
Omega ratio: Gain probability vs. loss probability	1.81	1.38	+0.43
Calmar ratio: Return relative to maximum drawdown	2.67	2.63	+0.04
Martin ratio: Return relative to average drawdown	9.57	9.26	+0.30
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

THIMX vs. TSIIX - Sharpe Ratio Comparison

The current THIMX Sharpe Ratio is 2.87, which is higher than the TSIIX Sharpe Ratio of 2.00. The chart below compares the historical Sharpe Ratios of THIMX and TSIIX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	THIMX	TSIIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.87	2.00	+0.87
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.50	0.90	-0.41
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.61	1.46	-0.85
Sharpe Ratio (All Time) Calculated using the full available price history	1.40	1.39	+0.01

Drawdowns

THIMX vs. TSIIX - Drawdown Comparison

The maximum THIMX drawdown since its inception was -10.22%, smaller than the maximum TSIIX drawdown of -21.98%. Use the drawdown chart below to compare losses from any high point for THIMX and TSIIX.

Drawdown Indicators

	THIMX	TSIIX	Difference
Max Drawdown Largest peak-to-trough decline	-10.22%	-21.98%	+11.76%
Max Drawdown (1Y) Largest decline over 1 year	-2.39%	-2.14%	-0.25%
Max Drawdown (3Y) Largest decline over 3 years	-4.32%	-2.62%	-1.70%
Max Drawdown (5Y) Largest decline over 5 years	-10.22%	-9.40%	-0.82%
Max Drawdown (10Y) Largest decline over 10 years	-10.22%	-9.58%	-0.64%
Current Drawdown Current decline from peak	-0.29%	-0.46%	+0.17%
Average Drawdown Average peak-to-trough decline	-1.33%	-1.65%	+0.32%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.66%	0.61%	+0.05%

Volatility

THIMX vs. TSIIX - Volatility Comparison

The current volatility for Thornburg Intermediate Municipal Fund (THIMX) is 0.80%, while Thornburg Strategic Income Fund (TSIIX) has a volatility of 0.94%. This indicates that THIMX experiences smaller price fluctuations and is considered to be less risky than TSIIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	THIMX	TSIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.80%	0.94%	-0.14%
Volatility (6M) Calculated over the trailing 6-month period	1.66%	2.06%	-0.40%
Volatility (1Y) Calculated over the trailing 1-year period	2.22%	2.83%	-0.61%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.25%	3.38%	-0.13%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.28%	2.95%	+0.33%

THIMX vs. TSIIX - Expense Ratio Comparison

THIMX has a 0.77% expense ratio, which is higher than TSIIX's 0.60% expense ratio.

Dividends

THIMX vs. TSIIX - Dividend Comparison

THIMX's dividend yield for the trailing twelve months is around 3.68%, less than TSIIX's 4.88% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
THIMX Thornburg Intermediate Municipal Fund	3.68%	4.82%	4.03%	2.60%	2.40%	2.25%	2.39%	2.62%	2.48%	2.18%	2.04%	2.08%
TSIIX Thornburg Strategic Income Fund	4.88%	4.99%	5.10%	4.50%	3.49%	4.17%	3.70%	3.82%	3.40%	3.59%	3.43%	4.51%

Frequently Asked Questions

Can I hold both THIMX and TSIIX in my portfolio?

THIMX and TSIIX have a correlation of 0.55, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, THIMX or TSIIX?

TSIIX has higher volatility (0.94%) compared to THIMX (0.80%). In terms of maximum drawdown, THIMX dropped -10.22% vs TSIIX's -21.98%.

Which has better risk-adjusted returns?

THIMX currently has the higher Sharpe Ratio (2.87 vs 2.00), 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.