FLDB vs. VUSB

Last updated Apr 1, 2026

Compare and contrast key facts about Fidelity Low Duration Bond ETF (FLDB) and Vanguard Ultra-Short Bond ETF (VUSB).

FLDB and VUSB are both exchange-traded funds (ETFs), meaning they are traded on stock exchanges and can be bought and sold throughout the day. FLDB is an actively managed fund by Fidelity. It was launched on Feb 22, 2024. VUSB is an actively managed fund by Vanguard. It was launched on Apr 5, 2021.

Performance

FLDB vs. VUSB - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Low Duration Bond ETF (FLDB) and Vanguard Ultra-Short Bond ETF (VUSB). The values are adjusted to include any dividend payments, if applicable.

FLDB vs. VUSB - Yearly Performance Comparison

	2026 (YTD)	2025	2024
FLDB Fidelity Low Duration Bond ETF	0.80%	4.93%	4.29%
VUSB Vanguard Ultra-Short Bond ETF	0.59%	5.20%	5.14%

Returns By Period

In the year-to-date period, FLDB achieves a 0.80% return, which is significantly higher than VUSB's 0.59% return.

FLDB

• 1D: 0.06%
• 1M: 0.12%
• YTD: 0.80%
• 6M: 1.91%
• 1Y: 4.65%
• 3Y*: —
• 5Y*: —
• 10Y*: —

VUSB

• 1D: 0.09%
• 1M: -0.12%
• YTD: 0.59%
• 6M: 1.76%
• 1Y: 4.48%
• 3Y*: 5.28%
• 5Y*: —
• 10Y*: —

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

FLDB vs. VUSB - Expense Ratio Comparison

FLDB has a 0.20% expense ratio, which is higher than VUSB's 0.10% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

FLDB

Fidelity Low Duration Bond ETF

VUSB

Vanguard Ultra-Short Bond ETF

Return for Risk

FLDB vs. VUSB — Risk / Return Rank

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

FLDB

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

VUSB

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

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.

FLDB vs. VUSB - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Low Duration Bond ETF (FLDB) and Vanguard Ultra-Short Bond ETF (VUSB). 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.

	FLDB	VUSB	Difference
Sharpe ratio Return per unit of total volatility	4.45	5.84	-1.39
Sortino ratio Return per unit of downside risk	7.69	9.33	-1.63
Omega ratio Gain probability vs. loss probability	2.09	2.86	-0.77
Calmar ratio Return relative to maximum drawdown	11.28	9.75	+1.53
Martin ratio Return relative to average drawdown	64.34	50.27	+14.07
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FLDB vs. VUSB - Sharpe Ratio Comparison

The current FLDB Sharpe Ratio is 4.45, which is comparable to the VUSB Sharpe Ratio of 5.84. The chart below compares the historical Sharpe Ratios of FLDB and VUSB, 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

	FLDB	VUSB	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	4.45	5.84	-1.39
Sharpe Ratio (All Time) Calculated using the full available price history	3.62	4.00	-0.39

Correlation

The correlation between FLDB and VUSB is 0.26, which is considered to be low. This implies their price changes are not closely related. A low correlation is generally favorable for portfolio diversification, as it helps to reduce overall risk by spreading it across multiple assets with different performance patterns.

Dividends

FLDB vs. VUSB - Dividend Comparison

FLDB's dividend yield for the trailing twelve months is around 4.55%, which matches VUSB's 4.53% yield.

	TTM	2025	2024	2023	2022	2021
FLDB Fidelity Low Duration Bond ETF	4.55%	4.72%	3.58%	0.00%	0.00%	0.00%
VUSB Vanguard Ultra-Short Bond ETF	4.53%	4.63%	5.16%	4.45%	1.56%	0.26%

Drawdowns

FLDB vs. VUSB - Drawdown Comparison

The maximum FLDB drawdown since its inception was -0.49%, smaller than the maximum VUSB drawdown of -1.79%. Use the drawdown chart below to compare losses from any high point for FLDB and VUSB.

Drawdown Indicators

	FLDB	VUSB	Difference
Max Drawdown Largest peak-to-trough decline	-0.49%	-1.79%	+1.30%
Max Drawdown (1Y) Largest decline over 1 year	-0.40%	-0.46%	+0.06%
Current Drawdown Current decline from peak	0.00%	-0.12%	+0.12%
Average Drawdown Average peak-to-trough decline	-0.05%	-0.28%	+0.23%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.07%	0.09%	-0.02%

Volatility

FLDB vs. VUSB - Volatility Comparison

The current volatility for Fidelity Low Duration Bond ETF (FLDB) is 0.28%, while Vanguard Ultra-Short Bond ETF (VUSB) has a volatility of 0.37%. This indicates that FLDB experiences smaller price fluctuations and is considered to be less risky than VUSB based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FLDB	VUSB	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.28%	0.37%	-0.09%
Volatility (6M) Calculated over the trailing 6-month period	0.68%	0.49%	+0.19%
Volatility (1Y) Calculated over the trailing 1-year period	1.07%	0.77%	+0.30%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.33%	0.83%	+0.50%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.33%	0.83%	+0.50%