VBMFX — Vanguard Total Bond Market Index Fund, Investor Shares
Data updated: 2026-08-28
VBMFX — Vanguard Total Bond Market Index Fund, Investor Shares. 0.15% expense ratio · no sales load · since 1986. Holdings, fees, performance and SEC filings.
VBMFX Fund Overview
VBMFX — Vanguard Total Bond Market Index Fund, Investor Shares is a US mutual fund managed by The Vanguard Group, Inc., categorised as Intermediate Core Bond. VBMFX tracks the Bloomberg U.S. Aggregate Float Adjusted Index. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund (index fund)
- Adviser: The Vanguard Group, Inc.
- Trust: Vanguard Bond Index Funds
- Category: Intermediate Core Bond
- Benchmark: Bloomberg U.S. Aggregate Float Adjusted Index
- Inception date: December 11, 1986
- Assets under management: $397.11B
- 1-year return: 3.6%
- Ticker: VBMFX
- SEC CIK: 0000794105
- SEC series ID: S000002564
- Share class ID: C000007062
- CUSIP: 921937108
- ISIN: US9219371088
- FIGI: BBG000BBXL81
- LEI: CIJB0QNLPT2SSWMJ5W92
About VBMFX
Vanguard Total Bond Market Index Fund (VBMFX) seeks to track the performance of a broad, market-weighted bond index. It invests at least 80% of its net assets, plus any borrowings for investment purposes, in bonds that make up the Bloomberg U.S. Aggregate Float Adjusted Index or securities with substantially identical economic characteristics, using a sampling approach. Its Investor Shares, launched December 11, 1986, cost 0.15% a year and returned 3.6% in the 12 months to June 30, 2026, based on monthly returns reported to the SEC on Form N-PORT, with 2.9% volatility.
VBMFX Holdings
Top 10 holdings of Vanguard Total Bond Market Index Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Vanguard Cmt Funds-Vanguard Market Liquidity Fund | 0.90% |
| United States Treasury Note/Bond | 0.47% |
| United States Treasury Note/Bond | 0.41% |
| United States Treasury Note/Bond | 0.41% |
| United States Treasury Note/Bond | 0.41% |
| United States Treasury Note/Bond | 0.41% |
| United States Treasury Note/Bond | 0.41% |
| United States Treasury Note/Bond | 0.41% |
| United States Treasury Note/Bond | 0.40% |
| United States Treasury Note/Bond | 0.39% |
VBMFX Portfolio Allocation
Asset-class allocation of Vanguard Total Bond Market Index Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 77.8% |
| Securitized | 21.1% |
| Cash & Equivalents | 0.9% |
VBMFX Performance
Total returns for VBMFX through June 2026, from SEC filings.
| Period | Total return |
|---|---|
| YTD | 0.70% |
| 1 year | 3.59% |
| 3 years (annualised) | 4.05% |
| 5 years (annualised) | -0.03% |
VBMFX Risk Information
Risk metrics for VBMFX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 2.91%
VBMFX Costs and Fees
VBMFX costs about $15 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.15%
- Gross expense ratio: 0.15%
- Portfolio turnover: 38%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
VBMFX Cashflows
Over the 12 months to 2026-06, Vanguard Total Bond Market Index Fund had net inflows of $39.25B, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | $3.66B |
| 2026-05 | $5.06B |
| 2026-04 | $2.81B |
| 2026-03 | −$1.24B |
| 2026-02 | $2.94B |
| 2026-01 | $4.25B |
VBMFX Debt Constituents
Largest debt holdings of Vanguard Total Bond Market Index Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| United States Treasury Note/Bond | 0.47% |
| United States Treasury Note/Bond | 0.41% |
| United States Treasury Note/Bond | 0.41% |
| United States Treasury Note/Bond | 0.41% |
| United States Treasury Note/Bond | 0.41% |
| United States Treasury Note/Bond | 0.41% |
| United States Treasury Note/Bond | 0.41% |
| United States Treasury Note/Bond | 0.40% |
| United States Treasury Note/Bond | 0.39% |
| United States Treasury Note/Bond | 0.39% |
VBMFX Prospectus and SEC Filings
Official Vanguard Total Bond Market Index Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-04-28
- Prospectus (485BPOS) — filed 2025-04-29
- Prospectus (497) — filed 2025-02-03
- Portfolio holdings (N-PORT) — filed 2026-08-28
- Portfolio holdings (N-PORT) — filed 2026-05-28
- Portfolio holdings (N-PORT) — filed 2026-02-26
- Annual census (N-CEN) — filed 2026-03-12
- Annual census (N-CEN) — filed 2025-03-13
VBMFX Service Providers
Firms that manage, distribute, hold, administer and audit Vanguard Total Bond Market Index Fund, as reported on SEC Form N-CEN, fiscal year ending December 31, 2025.
- Adviser: The Vanguard Group, Inc.
- Distributor: Vanguard Marketing Corp.
- Custodian: JPMorgan Chase Bank NA
- Transfer agent: The Vanguard Group, Inc.
- Administrator: The Vanguard Group, Inc.
- Auditor: Pricewaterhousecoopers Llp
Related Funds
Other Intermediate Core Bond funds tracked on ABC INVEST:
VBMFX: Frequently Asked Questions
What is the expense ratio of Vanguard Total Bond Market Index Fund (VBMFX)?
VBMFX has a net expense ratio of 0.15%, about $15 a year for every $10,000 invested. VBMFX fees and costs
Does VBMFX charge a sales load?
No. This share class (VBMFX) charges no sales load.
What index does VBMFX track?
VBMFX is an index fund that tracks the Bloomberg U.S. Aggregate Float Adjusted Index.
What are VBMFX's top holdings?
As of June 30, 2026, VBMFX held 17,409 positions. The largest are Vanguard Cmt Funds-Vanguard Market Liquidity Fund (0.90%), United States Treasury Note/Bond (0.47%), United States Treasury Note/Bond (0.41%), United States Treasury Note/Bond (0.41%) and United States Treasury Note/Bond (0.41%). All VBMFX holdings
Can I download the full list of VBMFX holdings?
Yes. The complete VBMFX holdings list as of June 30, 2026 can be downloaded as a CSV file from the Holdings page: holding, ticker, FIGI, sector, country, asset type, shares, value and share of net assets, from the fund's SEC N-PORT filing. Download VBMFX holdings (CSV)
How has Vanguard Total Bond Market Index Fund performed?
VBMFX returned +3.6% over the 12 months to June 2026, +4.1% a year over 3 years and −0.0% a year over 5 years. VBMFX performance and risk
How large is VBMFX?
VBMFX manages $397.11B (SEC N-PORT, June 2026). Investors added a net $39.25B over the past 12 months.
Who manages VBMFX and when did it launch?
VBMFX is managed by The Vanguard Group, Inc.. It is a series of Vanguard Bond Index Funds. It launched on December 11, 1986.
How does VBMFX compare with similar Intermediate Core Bond funds?
Among 260 Intermediate Core Bond funds with $100M+ in assets, VBMFX ranks #44 of 259 on net expense ratio (0.15%) and is the largest by assets. The lowest-cost fund in the group is Fidelity Series Investment Grade Bond Fund (FSIGX, 0.00%). Compare VBMFX with FSIGX
Where can I find VBMFX's prospectus and SEC filings?
VBMFX's latest prospectus (485BPOS) was filed April 28, 2026 and its latest N-PORT holdings report was filed August 28, 2026. All 56 filings are linked on ABC INVEST and on SEC EDGAR (series S000002564). VBMFX SEC filings
What is the CUSIP and ISIN of VBMFX?
Vanguard Total Bond Market Index Fund (VBMFX) has CUSIP 921937108 and ISIN US9219371088. These codes identify this share class (Investor Shares); each of the fund's 7 share classes has its own. Brokers and trading platforms use these codes to look up the fund.
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, and annual data from Form N-CEN.
For information only. Not investment advice: figures are as reported in SEC filings and may contain errors or be out of date. Past performance does not guarantee future results.