TLDIX vs. FZOLX

Last updated Apr 1, 2026

Compare and contrast key facts about Thornburg Ultra Short Income Fund (TLDIX) and Fidelity SAI Low Duration Income Fund (FZOLX).

TLDIX is managed by Thornburg. It was launched on Dec 30, 2013. FZOLX is managed by Fidelity. It was launched on Oct 13, 2020.

Performance

TLDIX vs. FZOLX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Thornburg Ultra Short Income Fund (TLDIX) and Fidelity SAI Low Duration Income Fund (FZOLX). The values are adjusted to include any dividend payments, if applicable.

TLDIX vs. FZOLX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020
TLDIX Thornburg Ultra Short Income Fund	0.72%	4.84%	5.81%	4.92%	-0.00%	0.32%	0.52%
FZOLX Fidelity SAI Low Duration Income Fund	0.40%	4.85%	5.59%	5.72%	0.34%	-0.04%	0.11%

Returns By Period

In the year-to-date period, TLDIX achieves a 0.72% return, which is significantly higher than FZOLX's 0.40% return.

TLDIX

• 1D: 0.00%
• 1M: 0.08%
• YTD: 0.72%
• 6M: 1.81%
• 1Y: 4.33%
• 3Y*: 4.97%
• 5Y*: 3.28%
• 10Y*: 2.78%

FZOLX

• 1D: 0.00%
• 1M: -0.20%
• YTD: 0.40%
• 6M: 1.58%
• 1Y: 3.97%
• 3Y*: 5.09%
• 5Y*: 3.36%
• 10Y*: —

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

TLDIX vs. FZOLX - Expense Ratio Comparison

TLDIX has a 0.76% expense ratio, which is higher than FZOLX's 0.22% expense ratio.

TLDIX

Thornburg Ultra Short Income Fund

FZOLX

Fidelity SAI Low Duration Income Fund

Return for Risk

TLDIX vs. FZOLX — Risk / Return Rank

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

TLDIX

TLDIX Risk / Return Rank: 100
TLDIX Sharpe Ratio Rank: 99
TLDIX Sortino Ratio Rank: 100
TLDIX Omega Ratio Rank: 100
TLDIX Calmar Ratio Rank: 100
TLDIX Martin Ratio Rank: 100

FZOLX

FZOLX Risk / Return Rank: 99
FZOLX Sharpe Ratio Rank: 99
FZOLX Sortino Ratio Rank: 100
FZOLX Omega Ratio Rank: 99
FZOLX Calmar Ratio Rank: 100
FZOLX Martin Ratio Rank: 100

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.

TLDIX vs. FZOLX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Thornburg Ultra Short Income Fund (TLDIX) and Fidelity SAI Low Duration Income Fund (FZOLX). 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.

	TLDIX	FZOLX	Difference
Sharpe ratio Return per unit of total volatility	3.49	3.35	+0.14
Sortino ratio Return per unit of downside risk	15.85	10.47	+5.38
Omega ratio Gain probability vs. loss probability	5.39	3.53	+1.85
Calmar ratio Return relative to maximum drawdown	19.45	14.91	+4.54
Martin ratio Return relative to average drawdown	86.69	69.67	+17.03
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

TLDIX vs. FZOLX - Sharpe Ratio Comparison

The current TLDIX Sharpe Ratio is 3.49, which is comparable to the FZOLX Sharpe Ratio of 3.35. The chart below compares the historical Sharpe Ratios of TLDIX and FZOLX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	TLDIX	FZOLX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.49	3.35	+0.14
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	2.52	2.84	-0.32
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	2.20	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	2.06	2.67	-0.62

Correlation

The correlation between TLDIX and FZOLX is 0.41, which is considered to be moderate. This suggests that the two assets have some degree of positive relationship in their price movements. Moderate correlation can be acceptable for portfolio diversification, offering a balance between risk and potential returns.

Dividends

TLDIX vs. FZOLX - Dividend Comparison

TLDIX's dividend yield for the trailing twelve months is around 4.23%, less than FZOLX's 4.82% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
TLDIX Thornburg Ultra Short Income Fund	4.23%	4.89%	5.64%	4.12%	2.12%	1.53%	2.32%	2.82%	2.37%	1.62%	1.24%	0.89%
FZOLX Fidelity SAI Low Duration Income Fund	4.82%	5.26%	5.15%	4.03%	1.14%	0.16%	0.01%	0.00%	0.00%	0.00%	0.00%	0.00%

Drawdowns

TLDIX vs. FZOLX - Drawdown Comparison

The maximum TLDIX drawdown since its inception was -3.43%, which is greater than FZOLX's maximum drawdown of -1.10%. Use the drawdown chart below to compare losses from any high point for TLDIX and FZOLX.

Drawdown Indicators

	TLDIX	FZOLX	Difference
Max Drawdown Largest peak-to-trough decline	-3.43%	-1.10%	-2.33%
Max Drawdown (1Y) Largest decline over 1 year	-0.25%	-0.30%	+0.05%
Max Drawdown (5Y) Largest decline over 5 years	-1.39%	-1.10%	-0.29%
Max Drawdown (10Y) Largest decline over 10 years	-3.43%	—	—
Current Drawdown Current decline from peak	0.00%	-0.20%	+0.20%
Average Drawdown Average peak-to-trough decline	-0.17%	-0.14%	-0.03%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.06%	0.06%	0.00%

Volatility

TLDIX vs. FZOLX - Volatility Comparison

The current volatility for Thornburg Ultra Short Income Fund (TLDIX) is 0.19%, while Fidelity SAI Low Duration Income Fund (FZOLX) has a volatility of 0.25%. This indicates that TLDIX experiences smaller price fluctuations and is considered to be less risky than FZOLX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TLDIX	FZOLX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.19%	0.25%	-0.06%
Volatility (6M) Calculated over the trailing 6-month period	0.92%	0.88%	+0.04%
Volatility (1Y) Calculated over the trailing 1-year period	1.38%	1.31%	+0.07%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.31%	1.19%	+0.12%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.27%	1.14%	+0.13%