Vanguard Mortgage-Backed Secs Idx Fund Admiral (VMBSX)
18.08
-0.01
(-0.06%)
USD |
Sep 15 2026
Returns Chart
Key Stats
| Net Expense Ratio | Total Assets Under Management | Weighted Average Dividend Yield | Turnover Ratio (Generic) |
|---|---|---|---|
| 0.04% | 17.59B | -- | 91.00% |
| 1 Year Fund Level Flows | 1 Year Total Returns (Daily) | Annualized Total Returns Since Inception (Daily) | Max Drawdown (Since Inception) |
| 1.188B | -0.11% |
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 |
| Equity Style | -- |
| 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:
2
-145.21M
Peer Group Low
512.02M
Peer Group High
1 Year
% Rank:
2
1.188B
-2.576B
Peer Group Low
1.188B
Peer Group High
3 Months
% Rank:
2
-526.43M
Peer Group Low
1.176B
Peer Group High
3 Years
% Rank:
94
-7.236B
Peer Group Low
8.148B
Peer Group High
6 Months
% Rank:
2
-627.11M
Peer Group Low
1.257B
Peer Group High
5 Years
% Rank:
17
-17.75B
Peer Group Low
12.64B
Peer Group High
YTD
% Rank:
2
-658.78M
Peer Group Low
1.279B
Peer Group High
10 Years
% Rank:
3
-36.95B
Peer Group Low
26.60B
Peer Group High
Date Unavailable
Risk
Performance Versus Peer Group
Annual Total Returns Versus Peers
As of September 16, 2026.
Asset Allocation
As of July 31, 2026.
| Type | % Net |
|---|---|
| Cash | 0.21% |
| Stock | 0.00% |
| Bond | 93.40% |
| Convertible | 0.00% |
| Preferred | 0.00% |
| Other | 6.39% |
Top 10 Holdings
| Name | % Weight | Price | % Change |
|---|---|---|---|
|
Vanguard Market Liquidity Fund
|
3.60% | -- | -- |
|
Government National Mortgage Association 2 5.5% 01-AUG-2056
|
0.38% | -- | -- |
|
Government National Mortgage Association 2 20-NOV-2054 MB0025
|
0.29% | -- | -- |
|
Government National Mortgage Association 2 20-JAN-2056 MB0871
|
0.29% | -- | -- |
|
Federal National Mortgage Association 5% 01-SEP-2056
|
0.28% | -- | -- |
|
Government National Mortgage Association 2 20-JUN-2056 MB1216
|
0.27% | -- | -- |
|
Federal National Mortgage Association 01-MAR-2056 CC2762
|
0.27% | -- | -- |
|
Government National Mortgage Association 2 20-FEB-2056 MB0936
|
0.27% | -- | -- |
|
Government National Mortgage Association 2 20-NOV-2054 MB0024
|
0.26% | -- | -- |
|
Federal Home Loan Mortgage Corp 01-FEB-2052 SD4155
|
0.25% | -- | -- |
Fees & Availability
| Fees | |
| Actual 12B-1 Fee | -- |
| Actual Management Fee | 0.03% |
| Administration Fee | 394000.0 None |
| Maximum Front Load | -- |
| Maximum Deferred Load | -- |
| Maximum Redemption Fee | -- |
| General Availability | |
| Available for Insurance Product | -- |
| Available for RRSP | -- |
| Purchase Details | |
| Open to New Investors |
|
| Minimum Initial Investment | 3000.00 None |
| Minimum Subsequent Investment | 1.00 None |
TTM Distributions
| Type | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Qualified Income
|
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
|
Normal
|
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
|
Qualified
|
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
|
LT Cap Gains
|
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
|
Ordinary Income
|
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
|
Non-Qual
|
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
|
ST Cap Gains
|
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
|
Interest
|
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
|
Tax-Exempt
|
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
|
ROC
|
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
|
Other
|
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
|
Total
|
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
As of August 31, 2026.
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 |
| Equity Style | -- |
| 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 (9-15-26) | 4.31% |
| 30-Day SEC Yield (8-31-26) | 4.27% |
| 7-Day SEC Yield | -- |
| Number of Holdings | 5175 |
| Bond | |
| Yield to Maturity (7-31-26) | 5.25% |
| Effective Duration | 5.40 |
| Average Coupon | 3.95% |
| Calculated Average Quality | 1.00 |
| Effective Maturity | 25.74 |
| Nominal Maturity | 25.74 |
| Number of Bond Holdings | 5124 |
As of July 31, 2026
Fund Details
| Key Dates | |
| Inception Date | 12/3/2009 |
| Last Annual Report Date | 8/31/2025 |
| Last Prospectus Date | 2/2/2026 |
| Share Classes | |
| VMBIX | Inst |
| Attributes | |
| Index Fund |
|
| Inverse Fund | -- |
| Leveraged Fund | -- |
| Fund of Funds | No |
| Currency Hedged Fund | -- |
| Socially Responsible 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:VMBSX", "name") |
| Broad Asset Class: =YCI("M:VMBSX", "broad_asset_class") |
| Broad Category: =YCI("M:VMBSX", "broad_category_group") |
| Prospectus Objective: =YCI("M:VMBSX", "prospectus_objective") |
| To find the codes for any of our securities and financial metrics, see our Complete Excel Reference. |