# U.S. Total Bond Index Master Portfolio

U.S. Total Bond Index Master Portfolio is a registered fund series of Master Investment Portfolio (series S000004287). Net assets $3.6B as of 2026-03-31. Index fund.

## Profile

- Series ID: S000004287
- Registrant: Master Investment Portfolio
- LEI: 549300QI52DSLLI6VD30
- Net assets: $3.6B
- Total assets: $4.2B
- As of: 2026-03-31
- Type: Index

## Advisers

- [BlackRock Fund Advisors (Advisor)](https://search.stillhousedata.com/firm/105247)

## Top holdings (200 reported)

_Showing 15 of 200 holdings by value._

| Holding | Ticker | Value | % of fund |
| --- | --- | --- | --- |
| [BlackRock Funds III](https://search.stillhousedata.com/security/066922519) | — | $182.8M | 501.36% |
| [BLACKROCK CASH FUNDS](https://search.stillhousedata.com/security/066922477) | — | $120.5M | 330.39% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CDJ7) | — | $20.3M | 55.71% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CKX8) | — | $19.2M | 52.73% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CKQ3) | — | $17.4M | 47.66% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CMM0) | — | $17.2M | 47.09% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CLG4) | — | $17.1M | 46.79% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CPE5) | — | $16.8M | 45.97% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CPS4) | — | $16.7M | 45.86% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CNT4) | — | $16.4M | 45.07% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CLK5) | — | $16.3M | 44.70% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CPL9) | — | $15.8M | 43.28% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CFF3) | — | $15.4M | 42.30% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CLN9) | — | $15.2M | 41.58% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CNC1) | — | $15.1M | 41.34% |

## Net asset history

| Report date | Net assets |
| --- | --- |
| 2026-03-31 | $3.6B |
| 2025-12-31 | $3.8B |
| 2025-09-30 | $3.6B |
| 2025-06-30 | $3.1B |
| 2025-03-31 | $3.1B |
| 2024-12-31 | $3.0B |
| 2024-09-30 | $3.0B |
| 2024-06-30 | $2.8B |

## More

- [Registrant: Master Investment Portfolio](https://search.stillhousedata.com/registrant/915092)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/fund/S000004287.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.