U.S. Total Bond Index Master Portfolio
Data updated: 2026-05-28
C000012009 — U.S. Total Bond Index Master Portfolio data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Long Total / Aggregate Bond · $3.65B AUM · 4.4% 1-yr return. From SEC regulatory filings.
C000012009 Fund Overview
U.S. Total Bond Index Master Portfolio is a US mutual fund managed by Master Investment Portfolio, categorised as Long 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: Master Investment Portfolio
- Category: Long Total / Aggregate Bond
- Assets under management: $3.65B
- 1-year return: 4.4%
- SEC CIK: 0000915092
- SEC series ID: S000004287
- Share class ID: C000012009
C000012009 Holdings
Top 10 holdings of U.S. Total Bond Index Master Portfolio by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| BlackRock Funds III | 5.01% |
| Blackrock Cash Funds | 3.30% |
| United States Treasury | 0.56% |
| United States Treasury | 0.53% |
| United States Treasury | 0.48% |
| United States Treasury | 0.47% |
| United States Treasury | 0.47% |
| United States Treasury | 0.46% |
| United States Treasury | 0.46% |
| United States Treasury | 0.45% |
C000012009 Portfolio Allocation
Asset-class allocation of U.S. Total Bond Index Master Portfolio by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 73.1% |
| Securitized | 25.4% |
| Cash & Equivalents | 8.3% |
C000012009 Performance
Total returns for C000012009 (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 0.1% |
| 1 year | 4.4% |
| 3 years (annualised) | 3.6% |
| 5 years (annualised) | 0.3% |
C000012009 Risk Information
Risk metrics for C000012009, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 3.5%
C000012009 Costs and Fees
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
C000012009 Cashflows
Over the 12 months to 2026-03, U.S. Total Bond Index Master Portfolio had net inflows of $550.95M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-03 | $33.88M |
| 2026-02 | −$2.91M |
| 2026-01 | $20.65M |
| 2025-12 | $167.33M |
| 2025-11 | $14.38M |
| 2025-10 | −$30.23M |
C000012009 Debt Constituents
Largest debt holdings of U.S. Total Bond Index Master Portfolio by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| United States Treasury | 0.56% |
| United States Treasury | 0.53% |
| United States Treasury | 0.48% |
| United States Treasury | 0.47% |
| United States Treasury | 0.47% |
| United States Treasury | 0.46% |
| United States Treasury | 0.46% |
| United States Treasury | 0.45% |
| United States Treasury | 0.45% |
| United States Treasury | 0.43% |
C000012009 Prospectus and SEC Filings
Official U.S. Total Bond Index Master Portfolio filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other Long 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.