Vanguard Mortgage-Backed Securities Index Fund Institutional Shares (VMBIX)
| Fund Assets | 16.65B |
| Expense Ratio | 0.05% |
| Min. Investment | $5,000,000 |
| Turnover | 91.00% |
| Dividend (ttm) | 1.07 |
| Dividend Yield | 4.22% |
| Dividend Growth | 8.11% |
| Payout Frequency | Monthly |
| Ex-Dividend Date | Apr 1, 2026 |
| Previous Close | 25.47 |
| YTD Return | 1.00% |
| 1-Year Return | 7.94% |
| 5-Year Return | 2.62% |
| 52-Week Low | 24.48 |
| 52-Week High | 25.91 |
| Beta (5Y) | n/a |
| Holdings | 5060 |
| Inception Date | May 9, 2012 |
About VMBIX
Vanguard Mortgage-Backed Securities Index Fund Institutional Shares is a mutual fund that seeks to closely track the performance of a broad, market-weighted index of U.S. mortgage-backed securities. The fund is structured to provide investors with exposure to a diversified pool of mortgage-backed pass-through securities issued predominantly by key government agencies, including the Government National Mortgage Association (GNMA), Federal National Mortgage Association (FNMA), and Federal Home Loan Mortgage Corporation (FHLMC). By following an indexing investment strategy, the fund aims for stability and consistent income while maintaining high credit quality, as its holdings are primarily backed or guaranteed by the U.S. government or government-sponsored enterprises. This fund plays an essential role in many institutional and diversified fixed-income portfolios, as it offers access to the unique risk-return characteristics of the U.S. mortgage market. Its design makes it a key vehicle for investors seeking broad exposure to the mortgage-backed security sector without requiring active management.
Performance
VMBIX had a total return of 7.94% in the past year, including dividends. Since the fund's inception, the average annual return has been 2.08%.
Equivalent ETF
VMBIX has an equivalent ETF with the ticker symbol VMBS, the Vanguard Mortgage-Backed Securities ETF. This is an ETF from the same fund company that follows the same index. It has an expense ratio of 0.04% compared to 0.05% for VMBIX.
| Symbol | Name | Expense Ratio |
|---|---|---|
| VMBS | Vanguard Mortgage-Backed Securities ETF | 0.04% |
Other Share Classes
These are alternative share classes of the same fund, from the same provider.
| Symbol | Share Class | Expense Ratio |
|---|---|---|
| VMBSX | Admiral Shares | 0.07% |
Dividend History
| Ex-Dividend | Amount | Pay Date |
|---|---|---|
| Apr 1, 2026 | $0.0879 | Apr 2, 2026 |
| Mar 2, 2026 | $0.0874 | Mar 3, 2026 |
| Feb 2, 2026 | $0.0889 | Feb 3, 2026 |
| Dec 17, 2025 | $0.0866 | Dec 18, 2025 |
| Nov 28, 2025 | $0.0873 | Dec 1, 2025 |
| Oct 31, 2025 | $0.093 | Nov 3, 2025 |