VMBIX vs. VTSAX
VMBIX (Vanguard Mortgage-Backed Securities Index Fund Institutional Shares) and VTSAX (Vanguard Total Stock Market Index Fund Admiral Shares) are both mutual funds - VMBIX is a Total Bond Market fund managed by Vanguard, while VTSAX is a Large Cap Blend Equities fund managed by Vanguard. Over the past 10 years, VMBIX returned 1.41%/yr vs 15.12%/yr for VTSAX. At a correlation of -0.06, they often move in opposite directions. VMBIX charges 0.05%/yr vs 0.04%/yr for VTSAX.
Performance
VMBIX vs. VTSAX - Performance Comparison
Loading charts...
Returns By Period
In the year-to-date period, VMBIX achieves a 0.86% return, which is significantly lower than VTSAX's 11.98% return. Over the past 10 years, VMBIX has underperformed VTSAX with an annualized return of 1.41%, while VTSAX has yielded a comparatively higher 15.12% annualized return.
VMBIX
- 1D
- 0.04%
- 1M
- 0.47%
- YTD
- 0.86%
- 6M
- 1.01%
- 1Y
- 7.00%
- 3Y*
- 4.71%
- 5Y*
- 0.57%
- 10Y*
- 1.41%
VTSAX
- 1D
- 0.24%
- 1M
- 5.76%
- YTD
- 11.98%
- 6M
- 11.87%
- 1Y
- 29.09%
- 3Y*
- 22.34%
- 5Y*
- 13.04%
- 10Y*
- 15.12%
VMBIX vs. VTSAX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
VMBIX Vanguard Mortgage-Backed Securities Index Fund Institutional Shares | 0.86% | 8.44% | 1.78% | 4.97% | -11.56% | -1.30% | 3.77% | 6.19% | 0.88% | 2.38% |
VTSAX Vanguard Total Stock Market Index Fund Admiral Shares | 11.98% | 17.12% | 23.23% | 26.51% | -19.52% | 25.72% | 20.98% | 30.79% | -5.18% | 21.16% |
Correlation
The correlation between VMBIX and VTSAX is 0.31, which is low. Their price movements are largely independent, making them effective diversification partners.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.31 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.25 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.20 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.06 |
Correlation (All Time) Calculated using the full available price history since Nov 24, 2009 | -0.06 |
The correlation between VMBIX and VTSAX shifts across timeframes, from -0.06 (all time) to 0.31 (1 year), reflecting how their relationship changes across market environments.
Compare stocks, funds, or ETFs
Search for stocks, ETFs, and funds for a quick comparison or use the comparison tool for more options.
Return for Risk
VMBIX vs. VTSAX — Risk / Return Rank
VMBIX
VTSAX
VMBIX vs. VTSAX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Vanguard Mortgage-Backed Securities Index Fund Institutional Shares (VMBIX) and Vanguard Total Stock Market Index Fund Admiral Shares (VTSAX). 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.
| VMBIX | VTSAX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.61 | ||
| Sortino ratioReturn per unit of downside risk | -0.57 | ||
| Omega ratioGain probability vs. loss probability | 1.34 | 1.44 | -0.10 |
| Calmar ratioReturn relative to maximum drawdown | 2.67 | 3.37 | -0.70 |
| Martin ratioReturn relative to average drawdown | 9.15 | 15.56 | -6.41 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
Loading charts...
Sharpe Ratios by Period
| VMBIX | VTSAX | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.86 | 2.47 | -0.61 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.09 | 0.76 | -0.66 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.29 | 0.82 | -0.53 |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.51 | 0.47 | +0.04 |
Drawdowns
VMBIX vs. VTSAX - Drawdown Comparison
The maximum VMBIX drawdown since its inception was -17.44%, smaller than the maximum VTSAX drawdown of -55.33%. Use the drawdown chart below to compare losses from any high point for VMBIX and VTSAX.
Loading charts...
Drawdown Indicators
| VMBIX | VTSAX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -17.44% | -55.33% | +37.89% |
Max Drawdown (1Y)Largest decline over 1 year | -2.63% | -8.92% | +6.29% |
Max Drawdown (3Y)Largest decline over 3 years | -7.51% | -19.36% | +11.85% |
Max Drawdown (5Y)Largest decline over 5 years | -17.11% | -25.36% | +8.25% |
Max Drawdown (10Y)Largest decline over 10 years | -17.44% | -34.97% | +17.53% |
Current DrawdownCurrent decline from peak | -1.15% | 0.00% | -1.15% |
Average DrawdownAverage peak-to-trough decline | -2.51% | -9.01% | +6.50% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.77% | 1.93% | -1.16% |
Volatility
VMBIX vs. VTSAX - Volatility Comparison
The current volatility for Vanguard Mortgage-Backed Securities Index Fund Institutional Shares (VMBIX) is 1.47%, while Vanguard Total Stock Market Index Fund Admiral Shares (VTSAX) has a volatility of 2.95%. This indicates that VMBIX experiences smaller price fluctuations and is considered to be less risky than VTSAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
Loading charts...
Volatility by Period
| VMBIX | VTSAX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.47% | 2.95% | -1.48% |
Volatility (6M)Calculated over the trailing 6-month period | 2.77% | 9.19% | -6.42% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.80% | 12.19% | -8.39% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.37% | 17.36% | -10.99% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 4.79% | 18.41% | -13.62% |
VMBIX vs. VTSAX - Expense Ratio Comparison
VMBIX has a 0.05% expense ratio, which is higher than VTSAX's 0.04% 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
VMBIX vs. VTSAX - Dividend Comparison
VMBIX's dividend yield for the trailing twelve months is around 4.18%, more than VTSAX's 1.00% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
VMBIX Vanguard Mortgage-Backed Securities Index Fund Institutional Shares | 4.18% | 4.20% | 4.27% | 3.29% | 2.33% | 1.01% | 2.02% | 2.76% | 2.74% | 2.18% | 2.13% | 2.04% |
VTSAX Vanguard Total Stock Market Index Fund Admiral Shares | 1.00% | 1.11% | 1.26% | 1.42% | 1.65% | 1.20% | 1.41% | 1.76% | 2.03% | 1.71% | 1.92% | 1.98% |
Frequently Asked Questions
VMBIX and VTSAX have a correlation of 0.31, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
VTSAX has higher volatility (2.95%) compared to VMBIX (1.47%). In terms of maximum drawdown, VMBIX dropped -17.44% vs VTSAX's -55.33%.
VTSAX currently has the higher Sharpe Ratio (2.47 vs 1.86), 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.
Find the right allocation for VMBIX and VTSAX
Add both to a portfolio and optimize allocations for your target — whether that's maximizing returns, minimizing drawdowns, or balancing risk across holdings.
Open Portfolio Optimizer