FZOLX vs. TLDIX

Last updated Apr 1, 2026

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

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

Performance

FZOLX vs. TLDIX - Performance Comparison

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

FZOLX vs. TLDIX - Yearly Performance Comparison

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

Returns By Period

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

FZOLX

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

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%

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

FZOLX vs. TLDIX - Expense Ratio Comparison

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

TLDIX

Thornburg Ultra Short Income Fund

FZOLX

Fidelity SAI Low Duration Income Fund

Return for Risk

FZOLX vs. TLDIX — Risk / Return Rank

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

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

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

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.

FZOLX vs. TLDIX - Risk-Adjusted Trends Comparison

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

	FZOLX	TLDIX	Difference
Sharpe ratio Return per unit of total volatility	3.35	3.49	-0.14
Sortino ratio Return per unit of downside risk	10.47	15.85	-5.38
Omega ratio Gain probability vs. loss probability	3.53	5.39	-1.85
Calmar ratio Return relative to maximum drawdown	14.91	19.45	-4.54
Martin ratio Return relative to average drawdown	69.67	86.69	-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.

FZOLX vs. TLDIX - Sharpe Ratio Comparison

The current FZOLX Sharpe Ratio is 3.35, which is comparable to the TLDIX Sharpe Ratio of 3.49. The chart below compares the historical Sharpe Ratios of FZOLX and TLDIX, 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

	FZOLX	TLDIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.35	3.49	-0.14
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	2.84	2.52	+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	2.67	2.06	+0.62

Correlation

The correlation between FZOLX and TLDIX 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

FZOLX vs. TLDIX - Dividend Comparison

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

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
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%
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%

Drawdowns

FZOLX vs. TLDIX - Drawdown Comparison

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

Drawdown Indicators

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

Volatility

FZOLX vs. TLDIX - Volatility Comparison

Fidelity SAI Low Duration Income Fund (FZOLX) has a higher volatility of 0.25% compared to Thornburg Ultra Short Income Fund (TLDIX) at 0.19%. This indicates that FZOLX's price experiences larger fluctuations and is considered to be riskier than TLDIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

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