FLDB vs. VSDB

Last updated Jun 4, 2026

FLDB (Fidelity Low Duration Bond ETF) and VSDB (Vanguard Short Duration Bond ETF Shares) are both Short-Term Bond funds. Both are actively managed. Over the past year, FLDB returned 4.19% vs 5.27% for VSDB. At a 0.26 correlation, their price movements are largely independent. FLDB charges 0.20%/yr vs 0.15%/yr for VSDB.

Performance

FLDB vs. VSDB - Performance Comparison

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

Returns By Period

In the year-to-date period, FLDB achieves a 1.28% return, which is significantly higher than VSDB's 0.94% return.

FLDB

• 1D: -0.13%
• 1M: 0.19%
• YTD: 1.28%
• 6M: 1.64%
• 1Y: 4.19%
• 3Y*: —
• 5Y*: —
• 10Y*: —

VSDB

• 1D: -0.03%
• 1M: 0.23%
• YTD: 0.94%
• 6M: 1.35%
• 1Y: 5.27%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

FLDB vs. VSDB - Yearly Performance Comparison

	2026 (YTD)	2025
FLDB Fidelity Low Duration Bond ETF	1.28%	3.55%
VSDB Vanguard Short Duration Bond ETF Shares	0.94%	4.85%

Correlation

The correlation between FLDB and VSDB is 0.28, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.28
Correlation (All Time) Calculated using the full available price history since Apr 4, 2025	0.26

Return for Risk

FLDB vs. VSDB — Risk / Return Rank

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

FLDB

FLDB Risk / Return Rank: 98
FLDB Sharpe Ratio Rank: 97
FLDB Sortino Ratio Rank: 98
FLDB Omega Ratio Rank: 98
FLDB Calmar Ratio Rank: 99
FLDB Martin Ratio Rank: 99

VSDB

VSDB Risk / Return Rank: 86
VSDB Sharpe Ratio Rank: 88
VSDB Sortino Ratio Rank: 93
VSDB Omega Ratio Rank: 92
VSDB Calmar Ratio Rank: 74
VSDB Martin Ratio Rank: 82

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. VSDB - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Low Duration Bond ETF (FLDB) and Vanguard Short Duration Bond ETF Shares (VSDB). 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	VSDB	Difference
Sharpe ratio Return per unit of total volatility	4.67	3.04	+1.64
Sortino ratio Return per unit of downside risk	8.43	4.79	+3.63
Omega ratio Gain probability vs. loss probability	2.11	1.63	+0.48
Calmar ratio Return relative to maximum drawdown	25.08	3.72	+21.36
Martin ratio Return relative to average drawdown	93.63	16.38	+77.26
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. VSDB - Sharpe Ratio Comparison

The current FLDB Sharpe Ratio is 4.67, which is higher than the VSDB Sharpe Ratio of 3.04. The chart below compares the historical Sharpe Ratios of FLDB and VSDB, 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

	FLDB	VSDB	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	4.67	3.04	+1.64
Sharpe Ratio (All Time) Calculated using the full available price history	3.56	2.65	+0.91

Drawdowns

FLDB vs. VSDB - Drawdown Comparison

The maximum FLDB drawdown since its inception was -0.49%, smaller than the maximum VSDB drawdown of -1.42%. Use the drawdown chart below to compare losses from any high point for FLDB and VSDB.

Drawdown Indicators

	FLDB	VSDB	Difference
Max Drawdown Largest peak-to-trough decline	-0.49%	-1.42%	+0.93%
Max Drawdown (1Y) Largest decline over 1 year	-0.17%	-1.42%	+1.25%
Current Drawdown Current decline from peak	-0.13%	-0.16%	+0.03%
Average Drawdown Average peak-to-trough decline	-0.05%	-0.19%	+0.14%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.04%	0.32%	-0.28%

Volatility

FLDB vs. VSDB - Volatility Comparison

The current volatility for Fidelity Low Duration Bond ETF (FLDB) is 0.34%, while Vanguard Short Duration Bond ETF Shares (VSDB) has a volatility of 0.55%. This indicates that FLDB experiences smaller price fluctuations and is considered to be less risky than VSDB based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FLDB	VSDB	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.34%	0.55%	-0.21%
Volatility (6M) Calculated over the trailing 6-month period	0.61%	1.35%	-0.74%
Volatility (1Y) Calculated over the trailing 1-year period	0.91%	1.75%	-0.84%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.31%	1.90%	-0.59%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.31%	1.90%	-0.59%

FLDB vs. VSDB - Expense Ratio Comparison

FLDB has a 0.20% expense ratio, which is higher than VSDB's 0.15% 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%.

Dividends

FLDB vs. VSDB - Dividend Comparison

FLDB's dividend yield for the trailing twelve months is around 4.45%, more than VSDB's 4.17% yield.

Position	TTM	2025	2024
FLDB Fidelity Low Duration Bond ETF	4.45%	4.72%	3.58%
VSDB Vanguard Short Duration Bond ETF Shares	4.17%	3.30%	0.00%

Frequently Asked Questions

Can I hold both FLDB and VSDB in my portfolio?

FLDB and VSDB have a correlation of 0.28, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FLDB or VSDB?

VSDB has higher volatility (0.55%) compared to FLDB (0.34%). In terms of maximum drawdown, FLDB dropped -0.49% vs VSDB's -1.42%.

Which ETF is better, FLDB or VSDB?

On 1-year performance, VSDB leads with 5.27% vs 4.19% for FLDB. On fees, VSDB is cheaper at 0.15% per year. On volatility, FLDB has been the lower-risk option at 0.34%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, FLDB or VSDB?

Over the 1-year period, VSDB has performed better with a 5.27% return vs 4.19%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, FLDB or VSDB?

VSDB is cheaper with a 0.15% expense ratio, compared with 0.20% for FLDB.

Which ETF pays a higher dividend yield, FLDB or VSDB?

FLDB has the higher dividend yield at 4.45%, compared with 4.17% for VSDB.

What is the main difference between FLDB and VSDB?

They also come from different issuers: Fidelity and Vanguard. Their fees differ too: 0.20% for FLDB and 0.15% for VSDB.

Which has better risk-adjusted returns?

FLDB currently has the higher Sharpe Ratio (4.67 vs 3.04), 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.