VFSUX vs. DFLEX

Last updated Jun 4, 2026

VFSUX (Vanguard Short-Term Investment-Grade Fund Admiral Shares) and DFLEX (DoubleLine Flexible Income Fund) are both mutual funds - VFSUX is a Total Bond Market fund managed by Vanguard, while DFLEX is a Nontraditional Bonds fund managed by DoubleLine. Over the past 10 years, VFSUX returned 2.64%/yr vs 3.75%/yr for DFLEX. A 0.51 correlation means they provide meaningful diversification when combined. VFSUX charges 0.10%/yr vs 0.74%/yr for DFLEX.

Performance

VFSUX vs. DFLEX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Short-Term Investment-Grade Fund Admiral Shares (VFSUX) and DoubleLine Flexible Income Fund (DFLEX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, VFSUX achieves a 0.82% return, which is significantly lower than DFLEX's 1.61% return. Over the past 10 years, VFSUX has underperformed DFLEX with an annualized return of 2.64%, while DFLEX has yielded a comparatively higher 3.75% annualized return.

VFSUX

• 1D: 0.00%
• 1M: 0.31%
• YTD: 0.82%
• 6M: 1.11%
• 1Y: 4.80%
• 3Y*: 5.63%
• 5Y*: 2.41%
• 10Y*: 2.64%

DFLEX

• 1D: 0.00%
• 1M: 0.45%
• YTD: 1.61%
• 6M: 1.94%
• 1Y: 5.66%
• 3Y*: 7.49%
• 5Y*: 3.23%
• 10Y*: 3.75%

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

VFSUX vs. DFLEX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VFSUX Vanguard Short-Term Investment-Grade Fund Admiral Shares	0.82%	6.87%	5.08%	6.17%	-5.75%	-0.62%	5.26%	5.85%	0.98%	2.13%
DFLEX DoubleLine Flexible Income Fund	1.61%	6.58%	8.65%	7.84%	-8.48%	3.79%	2.93%	7.21%	0.10%	5.27%

Correlation

The correlation between VFSUX and DFLEX is 0.58, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.58
Correlation (3Y) Calculated over the trailing 3-year period	0.59
Correlation (5Y) Calculated over the trailing 5-year period	0.65
Correlation (10Y) Calculated over the trailing 10-year period	0.56
Correlation (All Time) Calculated using the full available price history since Apr 9, 2014	0.51

The correlation between VFSUX and DFLEX shifts across timeframes, from 0.51 (all time) to 0.65 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

VFSUX vs. DFLEX — Risk / Return Rank

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

VFSUX

VFSUX Risk / Return Rank: 61
VFSUX Sharpe Ratio Rank: 49
VFSUX Sortino Ratio Rank: 78
VFSUX Omega Ratio Rank: 71
VFSUX Calmar Ratio Rank: 54
VFSUX Martin Ratio Rank: 55

DFLEX

DFLEX Risk / Return Rank: 98
DFLEX Sharpe Ratio Rank: 99
DFLEX Sortino Ratio Rank: 99
DFLEX Omega Ratio Rank: 98
DFLEX Calmar Ratio Rank: 96
DFLEX Martin Ratio Rank: 97

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.

VFSUX vs. DFLEX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Short-Term Investment-Grade Fund Admiral Shares (VFSUX) and DoubleLine Flexible Income Fund (DFLEX). 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.

	VFSUX	DFLEX	Difference
Sharpe ratio: Return per unit of total volatility	2.08	4.36	-2.28
Sortino ratio: Return per unit of downside risk	3.70	7.75	-4.05
Omega ratio: Gain probability vs. loss probability	1.47	2.35	-0.88
Calmar ratio: Return relative to maximum drawdown	2.83	6.23	-3.41
Martin ratio: Return relative to average drawdown	11.18	28.16	-16.98
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

VFSUX vs. DFLEX - Sharpe Ratio Comparison

The current VFSUX Sharpe Ratio is 2.08, which is lower than the DFLEX Sharpe Ratio of 4.36. The chart below compares the historical Sharpe Ratios of VFSUX and DFLEX, 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

	VFSUX	DFLEX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.08	4.36	-2.28
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.81	1.68	-0.87
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	1.06	1.38	-0.32
Sharpe Ratio (All Time) Calculated using the full available price history	1.35	1.38	-0.04

Drawdowns

VFSUX vs. DFLEX - Drawdown Comparison

The maximum VFSUX drawdown since its inception was -9.24%, smaller than the maximum DFLEX drawdown of -17.29%. Use the drawdown chart below to compare losses from any high point for VFSUX and DFLEX.

Drawdown Indicators

	VFSUX	DFLEX	Difference
Max Drawdown Largest peak-to-trough decline	-9.24%	-17.29%	+8.05%
Max Drawdown (1Y) Largest decline over 1 year	-1.71%	-0.91%	-0.80%
Max Drawdown (3Y) Largest decline over 3 years	-1.71%	-1.15%	-0.56%
Max Drawdown (5Y) Largest decline over 5 years	-9.24%	-11.00%	+1.76%
Max Drawdown (10Y) Largest decline over 10 years	-9.24%	-17.29%	+8.05%
Current Drawdown Current decline from peak	-0.23%	0.00%	-0.23%
Average Drawdown Average peak-to-trough decline	-0.87%	-1.55%	+0.68%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.43%	0.20%	+0.23%

Volatility

VFSUX vs. DFLEX - Volatility Comparison

Vanguard Short-Term Investment-Grade Fund Admiral Shares (VFSUX) has a higher volatility of 0.75% compared to DoubleLine Flexible Income Fund (DFLEX) at 0.45%. This indicates that VFSUX's price experiences larger fluctuations and is considered to be riskier than DFLEX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VFSUX	DFLEX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.75%	0.45%	+0.30%
Volatility (6M) Calculated over the trailing 6-month period	1.66%	0.99%	+0.67%
Volatility (1Y) Calculated over the trailing 1-year period	2.33%	1.31%	+1.02%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	2.99%	1.93%	+1.06%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	2.49%	2.73%	-0.24%

VFSUX vs. DFLEX - Expense Ratio Comparison

VFSUX has a 0.10% expense ratio, which is lower than DFLEX's 0.74% expense ratio.

Dividends

VFSUX vs. DFLEX - Dividend Comparison

VFSUX's dividend yield for the trailing twelve months is around 4.72%, less than DFLEX's 5.54% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
DFLEX DoubleLine Flexible Income Fund	5.54%	5.68%	6.05%	5.95%	4.72%	3.86%	3.96%	4.46%	4.46%	3.82%	3.75%	4.32%
VFSUX Vanguard Short-Term Investment-Grade Fund Admiral Shares	4.72%	4.59%	4.16%	3.14%	2.03%	1.79%	2.34%	2.92%	2.79%	2.11%	2.14%	2.09%

Frequently Asked Questions

Can I hold both VFSUX and DFLEX in my portfolio?

VFSUX and DFLEX have a correlation of 0.58, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, VFSUX or DFLEX?

VFSUX has higher volatility (0.75%) compared to DFLEX (0.45%). In terms of maximum drawdown, VFSUX dropped -9.24% vs DFLEX's -17.29%.

Which has better risk-adjusted returns?

DFLEX currently has the higher Sharpe Ratio (4.36 vs 2.08), 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.