Vanguard Mortgage-Backed Secs Idx Fund Inst (VMBIX)
25.48
-0.05
(-0.20%)
USD |
Dec 04 2025
Returns Chart
Key Stats
| Net Expense Ratio | Total Assets Under Management | Weighted Average Dividend Yield | Turnover Ratio (Generic) |
|---|---|---|---|
| 0.04% | 14.45B | -- | 79.00% |
| 1 Year Fund Level Flows | 1 Year Total Returns (Daily) | Annualized Total Returns Since Inception (Daily) | Max Drawdown (Since Inception) |
| -4.359B | 6.31% | Upgrade | Upgrade |
Basic Info
| Investment Strategy | |
| The Fund seeks to track the performance of a market-weighted mortgage-backed securities index. The Fund employs an indexing approach to track the Bloomberg Barclays US MBS Float Adjusted Index. The Fund invests by sampling the Index and at least 80% of the Funds assets will be invested in bonds included in the Index. |
| General | |
| Security Type | Mutual Fund |
| Broad Asset Class | Taxable Bond |
| Broad Category | Fixed Income |
| Global Peer Group | Bond USD Mortgages |
| Peer Group | U.S. Mortgage Funds |
| Global Macro | Bond HC |
| US Macro | U.S. Government & Treasury Fixed Income Funds |
| YCharts Categorization | -- |
| YCharts Benchmark | -- |
| Prospectus Objective | U.S. Mortgage Funds |
| Fund Owner Firm Name | Vanguard |
| Broad Asset Class Benchmark Index | |
| ^BBUSATR | 100.0% |
Net Fund Flows Versus Peer Group
1 Month
% Rank:
95
-2.634B
Peer Group Low
249.26M
Peer Group High
1 Year
% Rank:
100
-4.359B
-4.359B
Peer Group Low
5.384B
Peer Group High
3 Months
% Rank:
99
-2.714B
Peer Group Low
402.03M
Peer Group High
3 Years
% Rank:
94
-7.770B
Peer Group Low
11.17B
Peer Group High
6 Months
% Rank:
99
-1.091B
Peer Group Low
994.25M
Peer Group High
5 Years
% Rank:
5
-20.20B
Peer Group Low
12.23B
Peer Group High
YTD
% Rank:
100
-5.578B
Peer Group Low
5.384B
Peer Group High
10 Years
% Rank:
2
-28.21B
Peer Group Low
27.65B
Peer Group High
Date Unavailable
Risk
Performance Versus Peer Group
Annual Total Returns Versus Peers
As of December 05, 2025.
Asset Allocation
As of October 31, 2025.
| Type | % Net |
|---|---|
| Cash | 0.60% |
| Stock | 0.00% |
| Bond | 96.19% |
| Convertible | 0.00% |
| Preferred | 0.00% |
| Other | 3.21% |
Top 10 Holdings
| Name | % Weight | Price | % Change |
|---|---|---|---|
|
Vanguard Market Liquidity Fund
|
2.00% | -- | -- |
|
USD Cash
|
0.60% | -- | -- |
|
Federal Home Loan Mortgage Corp 01-FEB-2052 SD4155
|
0.30% | -- | -- |
|
Government National Mortgage Association 2 20-NOV-2054 MB0025
|
0.29% | -- | -- |
| FHLMC-New 2.0 05/25/2051 FIX USD Agency | 0.28% | 81.89 | -0.30% |
| FHLMC-New 2.0 02/25/2051 FIX USD Agency | 0.25% | 81.67 | -0.30% |
| FNMA-New 2.0 05/25/2051 FIX USD Agency | 0.25% | 81.67 | -0.30% |
| GNMA 2.0 04/20/2051 FIX USD Agency | 0.23% | 83.06 | -0.29% |
| FHLMC-New 2.0 11/25/2050 FIX USD Agency | 0.23% | 81.37 | -0.30% |
|
Federal National Mortgage Association 3% 01-NOV-2055
|
0.22% | -- | -- |
Fees & Availability
| Fees | |
| Actual 12B-1 Fee | -- |
| Actual Management Fee | 0.04% |
| Administration Fee | 126.0K% |
| Maximum Front Load | -- |
| Maximum Deferred Load | -- |
| Maximum Redemption Fee | -- |
| General Availability | |
| Available for Insurance Product | No |
| Available for RRSP | No |
| Purchase Details | |
| Open to New Investors |
|
| Minimum Initial Investment | 5.00M None |
| Minimum Subsequent Investment | 1.00 None |
Basic Info
| Investment Strategy | |
| The Fund seeks to track the performance of a market-weighted mortgage-backed securities index. The Fund employs an indexing approach to track the Bloomberg Barclays US MBS Float Adjusted Index. The Fund invests by sampling the Index and at least 80% of the Funds assets will be invested in bonds included in the Index. |
| General | |
| Security Type | Mutual Fund |
| Broad Asset Class | Taxable Bond |
| Broad Category | Fixed Income |
| Global Peer Group | Bond USD Mortgages |
| Peer Group | U.S. Mortgage Funds |
| Global Macro | Bond HC |
| US Macro | U.S. Government & Treasury Fixed Income Funds |
| YCharts Categorization | -- |
| YCharts Benchmark | -- |
| Prospectus Objective | U.S. Mortgage Funds |
| Fund Owner Firm Name | Vanguard |
| Broad Asset Class Benchmark Index | |
| ^BBUSATR | 100.0% |
Fundamentals
| General | |
| Distribution Yield | -- |
| Dividend Yield TTM (12-3-25) | 4.19% |
| 30-Day SEC Yield (10-31-25) | 4.06% |
| 7-Day SEC Yield | -- |
| Number of Holdings | 5120 |
| Bond | |
| Yield to Maturity (10-31-25) | 4.72% |
| Effective Duration | 5.20 |
| Average Coupon | 3.80% |
| Calculated Average Quality | 1.00 |
| Effective Maturity | 25.77 |
| Nominal Maturity | 25.77 |
| Number of Bond Holdings | 5087 |
As of October 31, 2025
Fund Details
| Key Dates | |
| Inception Date | 10/31/2013 |
| Last Annual Report Date | 8/31/2024 |
| Last Prospectus Date | 2/3/2025 |
| Share Classes | |
| VMBSX | Admiral |
| Attributes | |
| Index Fund |
|
| Inverse Fund | No |
| Leveraged Fund | -- |
| Fund of Funds | No |
| Currency Hedged Fund | -- |
| Synthetic Replication Fund | No |
Top Portfolio Holders
| Name | % Weight |
|---|---|
| Portfolio A | 5.00% |
| Portfolio B | 3.50% |
| Portfolio C | 2.25% |
Excel Add-In Codes
| Name: =YCI("M:VMBIX", "name") |
| Broad Asset Class: =YCI("M:VMBIX", "broad_asset_class") |
| Broad Category: =YCI("M:VMBIX", "broad_category_group") |
| Prospectus Objective: =YCI("M:VMBIX", "prospectus_objective") |
| To find the codes for any of our securities and financial metrics, see our Complete Excel Reference. |