VBMFX vs. VFIIX

Last updated Jun 4, 2026

VBMFX (Vanguard Total Bond Market Index Fund) and VFIIX (Vanguard GNMA Fund Investor Shares) are both mutual funds - VBMFX is a Intermediate Core Bond fund managed by Vanguard, while VFIIX is a Total Bond Market fund managed by Vanguard. Over the past 10 years, VBMFX returned 1.46%/yr vs 1.31%/yr for VFIIX. Their correlation of 0.86 suggests significant overlap in exposure. VBMFX charges 0.15%/yr vs 0.21%/yr for VFIIX.

Performance

VBMFX vs. VFIIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Total Bond Market Index Fund (VBMFX) and Vanguard GNMA Fund Investor Shares (VFIIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, VBMFX achieves a 0.38% return, which is significantly lower than VFIIX's 0.79% return. Over the past 10 years, VBMFX has outperformed VFIIX with an annualized return of 1.46%, while VFIIX has yielded a comparatively lower 1.31% annualized return.

VBMFX

• 1D: 0.00%
• 1M: 0.54%
• YTD: 0.38%
• 6M: 0.29%
• 1Y: 5.22%
• 3Y*: 3.93%
• 5Y*: 0.10%
• 10Y*: 1.46%

VFIIX

• 1D: 0.00%
• 1M: 0.31%
• YTD: 0.79%
• 6M: 0.89%
• 1Y: 6.35%
• 3Y*: 4.25%
• 5Y*: 0.47%
• 10Y*: 1.31%

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

VBMFX vs. VFIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VBMFX Vanguard Total Bond Market Index Fund	0.38%	7.05%	1.15%	5.62%	-13.25%	-2.04%	7.63%	8.61%	-0.34%	3.45%
VFIIX Vanguard GNMA Fund Investor Shares	0.79%	7.73%	1.07%	5.17%	-10.81%	-1.24%	3.73%	5.84%	0.89%	1.88%

Correlation

The correlation between VBMFX and VFIIX is 0.93, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.93
Correlation (3Y) Calculated over the trailing 3-year period	0.96
Correlation (5Y) Calculated over the trailing 5-year period	0.93
Correlation (10Y) Calculated over the trailing 10-year period	0.86
Correlation (All Time) Calculated using the full available price history since Dec 12, 1986	0.86

The correlation between VBMFX and VFIIX has been stable across timeframes, ranging from 0.86 to 0.96 - a consistent structural relationship.

Return for Risk

VBMFX vs. VFIIX — Risk / Return Rank

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

VBMFX

VBMFX Risk / Return Rank: 22
VBMFX Sharpe Ratio Rank: 22
VBMFX Sortino Ratio Rank: 23
VBMFX Omega Ratio Rank: 21
VBMFX Calmar Ratio Rank: 23
VBMFX Martin Ratio Rank: 20

VFIIX

VFIIX Risk / Return Rank: 32
VFIIX Sharpe Ratio Rank: 31
VFIIX Sortino Ratio Rank: 32
VFIIX Omega Ratio Rank: 30
VFIIX Calmar Ratio Rank: 36
VFIIX Martin Ratio Rank: 33

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.

VBMFX vs. VFIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Total Bond Market Index Fund (VBMFX) and Vanguard GNMA Fund Investor Shares (VFIIX). 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.

	VBMFX	VFIIX	Difference
Sharpe ratio: Return per unit of total volatility	1.33	1.60	-0.27
Sortino ratio: Return per unit of downside risk	2.00	2.36	-0.37
Omega ratio: Gain probability vs. loss probability	1.24	1.29	-0.05
Calmar ratio: Return relative to maximum drawdown	1.80	2.25	-0.45
Martin ratio: Return relative to average drawdown	5.43	7.47	-2.04
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

VBMFX vs. VFIIX - Sharpe Ratio Comparison

The current VBMFX Sharpe Ratio is 1.33, which is comparable to the VFIIX Sharpe Ratio of 1.60. The chart below compares the historical Sharpe Ratios of VBMFX and VFIIX, 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

	VBMFX	VFIIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.33	1.60	-0.27
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.02	0.08	-0.06
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.29	0.28	+0.02
Sharpe Ratio (All Time) Calculated using the full available price history	0.96	0.64	+0.32

Drawdowns

VBMFX vs. VFIIX - Drawdown Comparison

The maximum VBMFX drawdown since its inception was -19.08%, smaller than the maximum VFIIX drawdown of -25.80%. Use the drawdown chart below to compare losses from any high point for VBMFX and VFIIX.

Drawdown Indicators

	VBMFX	VFIIX	Difference
Max Drawdown Largest peak-to-trough decline	-19.08%	-25.80%	+6.72%
Max Drawdown (1Y) Largest decline over 1 year	-2.91%	-2.83%	-0.08%
Max Drawdown (3Y) Largest decline over 3 years	-6.02%	-6.97%	+0.95%
Max Drawdown (5Y) Largest decline over 5 years	-18.24%	-15.79%	-2.45%
Max Drawdown (10Y) Largest decline over 10 years	-19.08%	-16.20%	-2.88%
Current Drawdown Current decline from peak	-2.90%	-1.38%	-1.52%
Average Drawdown Average peak-to-trough decline	-2.70%	-2.98%	+0.28%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.96%	0.85%	+0.11%

Volatility

VBMFX vs. VFIIX - Volatility Comparison

The current volatility for Vanguard Total Bond Market Index Fund (VBMFX) is 1.37%, while Vanguard GNMA Fund Investor Shares (VFIIX) has a volatility of 1.54%. This indicates that VBMFX experiences smaller price fluctuations and is considered to be less risky than VFIIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VBMFX	VFIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.37%	1.54%	-0.17%
Volatility (6M) Calculated over the trailing 6-month period	2.79%	2.94%	-0.15%
Volatility (1Y) Calculated over the trailing 1-year period	3.96%	4.01%	-0.05%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.01%	6.21%	-0.20%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.98%	4.70%	+0.28%

VBMFX vs. VFIIX - Expense Ratio Comparison

VBMFX has a 0.15% expense ratio, which is lower than VFIIX's 0.21% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

VBMFX vs. VFIIX - Dividend Comparison

VBMFX's dividend yield for the trailing twelve months is around 3.87%, more than VFIIX's 3.69% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
VBMFX Vanguard Total Bond Market Index Fund	3.87%	3.76%	3.57%	2.99%	2.49%	1.72%	2.31%	2.63%	2.47%	2.45%	2.43%	2.71%
VFIIX Vanguard GNMA Fund Investor Shares	3.69%	3.62%	3.58%	3.23%	2.34%	0.63%	1.87%	2.76%	2.90%	2.64%	3.01%	2.84%

Frequently Asked Questions

Can I hold both VBMFX and VFIIX in my portfolio?

With a correlation of 0.93, VBMFX and VFIIX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, VBMFX or VFIIX?

VFIIX has higher volatility (1.54%) compared to VBMFX (1.37%). In terms of maximum drawdown, VBMFX dropped -19.08% vs VFIIX's -25.80%.

Which has better risk-adjusted returns?

VFIIX currently has the higher Sharpe Ratio (1.60 vs 1.33), 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.