VFTAX vs. WFBIX

Last updated Jun 4, 2026

VFTAX (Vanguard FTSE Social Index Fund Admiral Shares) and WFBIX (iShares U.S. Aggregate Bond Index Fund) are both mutual funds - VFTAX is a Large Cap Growth Equities fund managed by Vanguard, while WFBIX is a Intermediate Core Bond fund managed by BlackRock. Over the past 5 years, VFTAX returned 13.82%/yr vs 0.99%/yr for WFBIX. At a 0.06 correlation, their price movements are largely independent. VFTAX charges 0.14%/yr vs 0.05%/yr for WFBIX.

Performance

VFTAX vs. WFBIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard FTSE Social Index Fund Admiral Shares (VFTAX) and iShares U.S. Aggregate Bond Index Fund (WFBIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, VFTAX achieves a 11.67% return, which is significantly higher than WFBIX's 0.43% return.

VFTAX

• 1D: 0.03%
• 1M: 7.31%
• YTD: 11.67%
• 6M: 11.59%
• 1Y: 29.31%
• 3Y*: 23.26%
• 5Y*: 13.82%
• 10Y*: —

WFBIX

• 1D: 0.00%
• 1M: 0.45%
• YTD: 0.43%
• 6M: 0.32%
• 1Y: 5.35%
• 3Y*: 5.33%
• 5Y*: 0.99%
• 10Y*: 1.96%

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

VFTAX vs. WFBIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
VFTAX Vanguard FTSE Social Index Fund Admiral Shares	11.67%	17.25%	25.97%	31.78%	-24.22%	27.70%	22.63%	23.59%
WFBIX iShares U.S. Aggregate Bond Index Fund	0.43%	7.16%	1.43%	9.65%	-13.03%	-1.79%	7.40%	7.46%

Correlation

The correlation between VFTAX and WFBIX is 0.25, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.25
Correlation (3Y) Calculated over the trailing 3-year period	0.20
Correlation (5Y) Calculated over the trailing 5-year period	0.15
Correlation (All Time) Calculated using the full available price history since Feb 8, 2019	0.06

The correlation between VFTAX and WFBIX shifts across timeframes, from 0.06 (all time) to 0.25 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

VFTAX vs. WFBIX — Risk / Return Rank

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

VFTAX

VFTAX Risk / Return Rank: 53
VFTAX Sharpe Ratio Rank: 60
VFTAX Sortino Ratio Rank: 54
VFTAX Omega Ratio Rank: 54
VFTAX Calmar Ratio Rank: 45
VFTAX Martin Ratio Rank: 53

WFBIX

WFBIX Risk / Return Rank: 22
WFBIX Sharpe Ratio Rank: 22
WFBIX Sortino Ratio Rank: 24
WFBIX Omega Ratio Rank: 22
WFBIX Calmar Ratio Rank: 23
WFBIX Martin Ratio Rank: 20

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.

VFTAX vs. WFBIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard FTSE Social Index Fund Admiral Shares (VFTAX) and iShares U.S. Aggregate Bond Index Fund (WFBIX). 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.

	VFTAX	WFBIX	Difference
Sharpe ratio: Return per unit of total volatility	2.28	1.36	+0.92
Sortino ratio: Return per unit of downside risk	3.09	2.04	+1.05
Omega ratio: Gain probability vs. loss probability	1.41	1.25	+0.16
Calmar ratio: Return relative to maximum drawdown	2.55	1.78	+0.77
Martin ratio: Return relative to average drawdown	10.83	5.34	+5.50
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

VFTAX vs. WFBIX - Sharpe Ratio Comparison

The current VFTAX Sharpe Ratio is 2.28, which is higher than the WFBIX Sharpe Ratio of 1.36. The chart below compares the historical Sharpe Ratios of VFTAX and WFBIX, 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

	VFTAX	WFBIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.28	1.36	+0.92
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.76	0.16	+0.60
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.38	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.83	0.94	-0.12

Drawdowns

VFTAX vs. WFBIX - Drawdown Comparison

The maximum VFTAX drawdown since its inception was -34.20%, which is greater than WFBIX's maximum drawdown of -18.68%. Use the drawdown chart below to compare losses from any high point for VFTAX and WFBIX.

Drawdown Indicators

	VFTAX	WFBIX	Difference
Max Drawdown Largest peak-to-trough decline	-34.20%	-18.68%	-15.52%
Max Drawdown (1Y) Largest decline over 1 year	-11.84%	-3.02%	-8.82%
Max Drawdown (3Y) Largest decline over 3 years	-20.18%	-6.09%	-14.09%
Max Drawdown (5Y) Largest decline over 5 years	-29.12%	-17.84%	-11.28%
Max Drawdown (10Y) Largest decline over 10 years	—	-18.68%	—
Current Drawdown Current decline from peak	0.00%	-1.50%	+1.50%
Average Drawdown Average peak-to-trough decline	-6.27%	-2.26%	-4.01%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.78%	1.00%	+1.78%

Volatility

VFTAX vs. WFBIX - Volatility Comparison

Vanguard FTSE Social Index Fund Admiral Shares (VFTAX) has a higher volatility of 3.26% compared to iShares U.S. Aggregate Bond Index Fund (WFBIX) at 1.34%. This indicates that VFTAX's price experiences larger fluctuations and is considered to be riskier than WFBIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VFTAX	WFBIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.26%	1.34%	+1.92%
Volatility (6M) Calculated over the trailing 6-month period	10.14%	2.83%	+7.31%
Volatility (1Y) Calculated over the trailing 1-year period	13.27%	3.97%	+9.30%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.37%	6.40%	+11.97%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.78%	5.17%	+15.61%

VFTAX vs. WFBIX - Expense Ratio Comparison

VFTAX has a 0.14% expense ratio, which is higher than WFBIX's 0.05% 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

VFTAX vs. WFBIX - Dividend Comparison

VFTAX's dividend yield for the trailing twelve months is around 0.79%, less than WFBIX's 3.91% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
VFTAX Vanguard FTSE Social Index Fund Admiral Shares	0.79%	0.85%	0.99%	1.10%	1.34%	0.94%	1.21%	1.43%	0.00%	0.00%	0.00%	0.00%
WFBIX iShares U.S. Aggregate Bond Index Fund	3.91%	3.78%	3.68%	6.82%	2.60%	2.04%	2.43%	2.88%	2.71%	2.24%	2.25%	2.20%

Frequently Asked Questions

Can I hold both VFTAX and WFBIX in my portfolio?

VFTAX and WFBIX have a correlation of 0.25, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, VFTAX or WFBIX?

VFTAX has higher volatility (3.26%) compared to WFBIX (1.34%). In terms of maximum drawdown, VFTAX dropped -34.20% vs WFBIX's -18.68%.

Which has better risk-adjusted returns?

VFTAX currently has the higher Sharpe Ratio (2.28 vs 1.36), 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.