Total Bond Market Index Portfolio
Data updated: 2026-08-28
C000012151 — Total Bond Market Index Portfolio. Intermediate Total / Aggregate Bond · $5.48B AUM. Holdings, fees, performance and SEC filings.
C000012151 Fund Overview
Total Bond Market Index Portfolio is a US mutual fund managed by Vanguard Variable Insurance Funds, categorised as Intermediate Total / Aggregate Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Vanguard Variable Insurance Funds
- Category: Intermediate Total / Aggregate Bond
- Assets under management: $5.48B
- 1-year return: 3.5%
- SEC CIK: 0000857490
- SEC series ID: S000004395
- Share class ID: C000012151
C000012151 Investment Objective and Strategy
Total Bond Market Index Portfolio describes its objective and strategy as follows, from its latest prospectus filed with the SEC by Vanguard Variable Insurance Funds.
Investment objective
Vanguard Variable Insurance Funds Total Bond Market Index Portfolio (the Fund) seeks to track the performance of a broad, market-weighted bond index.
Principal investment strategy
The Fund employs an indexing investment approach designed to track the performance of the Bloomberg U.S. Aggregate Float Adjusted Index (the Target Index). The Target Index measures the performance of a wide spectrum of public, investment-grade, taxable bonds in the United Statesincluding government, corporate, and international dollar-denominated bonds, as well as mortgage-backed and asset-backed securitiesall with maturities of more than 1 year. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the bonds that make up the Target Index and in securities that the advisor determines have substantially identical economic characteristics to the securities that make up the Target Index. The Fund invests by sampling the Target Index, meaning that it holds a range of securities that, in the aggregate, approximates the full Target Index in terms of key risk factors and other characteristics.
The Fund maintains a dollar-weighted average maturity consistent with that of the Target Index. As of December 31, 2025, the dollar-weighted average maturity of the Target Index was 8.2 years.
C000012151 Holdings
Top 10 holdings of Total Bond Market Index Portfolio 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 | 1.05% |
| United States Treasury Note/Bond | 0.41% |
| United States Treasury Note/Bond | 0.40% |
| United States Treasury Note/Bond | 0.40% |
| United States Treasury Note/Bond | 0.40% |
| United States Treasury Note/Bond | 0.39% |
| United States Treasury Note/Bond | 0.39% |
| United States Treasury Note/Bond | 0.39% |
| United States Treasury Note/Bond | 0.37% |
| United States Treasury Note/Bond | 0.36% |
C000012151 Portfolio Allocation
Asset-class allocation of Total Bond Market Index Portfolio by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 77.3% |
| Securitized | 21.1% |
| Cash & Equivalents | 1.1% |
C000012151 Performance
Total returns for C000012151 (as of 2026-10-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 0.6% |
| 1 year | 3.5% |
| 3 years (annualised) | 4.0% |
| 5 years (annualised) | -0.0% |
C000012151 Risk Information
Risk metrics for C000012151, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 3.0%
C000012151 Costs and Fees
C000012151 costs about $14 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.14%
- Gross expense ratio: 0.14%
- Portfolio turnover: 45%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
C000012151 Cashflows
Over the 12 months to 2026-06, Total Bond Market Index Portfolio had net inflows of $665.50M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | −$60.95M |
| 2026-05 | $31.84M |
| 2026-04 | $29.97M |
| 2026-03 | $166.20M |
| 2026-02 | −$44.04M |
| 2026-01 | $338.79M |
C000012151 Debt Constituents
Largest debt holdings of Total Bond Market Index Portfolio by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| United States Treasury Note/Bond | 0.41% |
| United States Treasury Note/Bond | 0.40% |
| United States Treasury Note/Bond | 0.40% |
| United States Treasury Note/Bond | 0.40% |
| United States Treasury Note/Bond | 0.39% |
| United States Treasury Note/Bond | 0.39% |
| United States Treasury Note/Bond | 0.39% |
| United States Treasury Note/Bond | 0.37% |
| United States Treasury Note/Bond | 0.36% |
| United States Treasury Note/Bond | 0.35% |
C000012151 Prospectus and SEC Filings
Official Total Bond Market Index Portfolio filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-04-28
- Prospectus (485BPOS) — filed 2025-04-29
- Prospectus (485BPOS) — filed 2024-04-26
- 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
Related Funds
Other Intermediate Total / Aggregate Bond funds tracked on ABC INVEST:
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, annual data from Form N-CEN, and shareholder reports from Form N-CSR.