VUSFX vs. FNSOX

Last updated Aug 5, 2026

VUSFX (Vanguard Ultra-Short-Term Bond Fund Admiral Shares) and FNSOX (Fidelity Short-Term Bond Index Fund) are both Total Bond Market funds. Over the past 5 years, VUSFX returned 3.61%/yr vs 1.53%/yr for FNSOX. Their 0.59 correlation means they have sometimes moved together and sometimes differently. VUSFX charges 0.10%/yr vs 0.03%/yr for FNSOX.

Performance

VUSFX vs. FNSOX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Ultra-Short-Term Bond Fund Admiral Shares (VUSFX) and Fidelity Short-Term Bond Index Fund (FNSOX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, VUSFX achieves a 2.01% return, which is significantly higher than FNSOX's 0.23% return.

VUSFX

• 1D: 0.02%
• 1M: 0.27%
• 6M: 1.59%
• YTD: 2.01%
• 1Y: 4.03%
• 3Y*: 5.32%
• 5Y*: 3.61%
• 10Y*: 2.75%
• ALL TIME*: 2.69%

FNSOX

• 1D: 0.10%
• 1M: -0.30%
• 6M: 0.08%
• YTD: 0.23%
• 1Y: 2.15%
• 3Y*: 4.37%
• 5Y*: 1.53%
• 10Y*: —
• ALL TIME*: 2.01%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
FNSOX Fidelity Short-Term Bond Index Fund	$0.00	$0.00	$0.00
VUSFX Vanguard Ultra-Short-Term Bond Fund Admiral Shares	$0.00	$0.00	$0.00

VUSFX vs. FNSOX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VUSFX Vanguard Ultra-Short-Term Bond Fund Admiral Shares	2.01%	5.11%	6.11%	5.53%	-0.38%	0.08%	2.10%	3.39%	2.10%	0.11%
FNSOX Fidelity Short-Term Bond Index Fund	0.23%	6.01%	3.90%	4.90%	-5.76%	-1.25%	4.28%	4.95%	1.14%	-0.22%

Correlation

The correlation between VUSFX and FNSOX is 0.55, which is moderate. They have sometimes moved together and sometimes differently, sharing some price drivers without tracking each other closely.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.55
Correlation (3Y) Balances recent behavior with more history.	0.65
Correlation (5Y) Shows whether the relationship held over a longer period.	0.73
Correlation (All Time) Calculated using the full available price history since Oct 31, 2017	0.59

The correlation between VUSFX and FNSOX shifts across timeframes, from 0.55 (1 year) to 0.73 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

VUSFX vs. FNSOX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

VUSFX

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

FNSOX

FNSOX Risk / Return Rank: 30
FNSOX Sharpe Ratio Rank: 30
FNSOX Sortino Ratio Rank: 31
FNSOX Omega Ratio Rank: 30
FNSOX Calmar Ratio Rank: 31
FNSOX Martin Ratio Rank: 27

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

VUSFX vs. FNSOX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Ultra-Short-Term Bond Fund Admiral Shares (VUSFX) and Fidelity Short-Term Bond Index Fund (FNSOX). 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.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	VUSFX	FNSOX	Difference
Sharpe ratio: Return per unit of total volatility	7.14	1.09	+6.04
Sortino ratio: Return per unit of downside risk	13.35	1.66	+11.69
Omega ratio: Gain probability vs. loss probability	3.98	1.20	+2.78
Calmar ratio: Return relative to maximum drawdown	16.46	1.46	+15.00
Martin ratio: Return relative to average drawdown	94.81	4.15	+90.66

VUSFX vs. FNSOX - Sharpe Ratio Comparison

The current VUSFX Sharpe Ratio is 7.14, which is higher than the FNSOX Sharpe Ratio of 1.09. The chart below compares the historical Sharpe Ratios of VUSFX and FNSOX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

VUSFX vs. FNSOX - Drawdown Comparison

The maximum VUSFX drawdown since its inception was -1.71%, smaller than the maximum FNSOX drawdown of -8.92%. Use the drawdown chart below to compare losses from any high point for VUSFX and FNSOX.

Drawdown Indicators

	VUSFX	FNSOX	Difference
Max Drawdown Largest peak-to-trough decline	-1.71%	-8.92%	+7.21%
Max Drawdown (1Y) Largest decline over 1 year	-0.25%	-1.47%	+1.22%
Max Drawdown (3Y) Largest decline over 3 years	-0.35%	-1.51%	+1.16%
Max Drawdown (5Y) Largest decline over 5 years	-1.71%	-8.64%	+6.93%
Max Drawdown (10Y) Largest decline over 10 years	-1.71%	—	—
Current Drawdown Current decline from peak	0.00%	-0.73%	+0.73%
Average Drawdown Average peak-to-trough decline	-0.15%	-1.71%	+1.56%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.04%	0.52%	-0.48%

Volatility

VUSFX vs. FNSOX - Volatility Comparison

The current volatility for Vanguard Ultra-Short-Term Bond Fund Admiral Shares (VUSFX) is 0.14%, while Fidelity Short-Term Bond Index Fund (FNSOX) has a volatility of 0.44%. This indicates that VUSFX experiences smaller price fluctuations and is considered to be less risky than FNSOX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VUSFX	FNSOX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.14%	0.44%	-0.30%
Volatility (6M) Calculated over the trailing 6-month period	0.45%	1.59%	-1.14%
Volatility (1Y) Calculated over the trailing 1-year period	0.58%	1.97%	-1.39%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.81%	2.90%	-2.09%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.68%	2.46%	-1.78%

VUSFX vs. FNSOX - Expense Ratio Comparison

VUSFX has a 0.10% expense ratio, which is higher than FNSOX's 0.03% 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

VUSFX vs. FNSOX - Dividend Comparison

VUSFX's dividend yield for the trailing twelve months is around 4.47%, more than FNSOX's 3.36% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
FNSOX Fidelity Short-Term Bond Index Fund	3.36%	3.22%	2.80%	1.74%	0.81%	0.80%	1.54%	2.61%	2.04%	0.34%	0.00%
VUSFX Vanguard Ultra-Short-Term Bond Fund Admiral Shares	4.47%	4.73%	5.52%	4.15%	1.38%	0.53%	1.62%	2.68%	2.23%	1.52%	1.07%

Frequently Asked Questions

Can I hold both VUSFX and FNSOX in my portfolio?

VUSFX and FNSOX 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, VUSFX or FNSOX?

FNSOX has higher volatility (0.44%) compared to VUSFX (0.14%). In terms of maximum drawdown, VUSFX dropped -1.71% vs FNSOX's -8.92%.

Which has better risk-adjusted returns?

VUSFX currently has the higher Sharpe Ratio (7.14 vs 1.09), 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.