# iShares U.S. Aggregate Bond Index Fund

iShares U.S. Aggregate Bond Index Fund is a registered fund series of BlackRock Funds III (series S000004270). Net assets $3.6B as of 2026-03-31. Index fund.

## Profile

- Series ID: S000004270
- Registrant: BlackRock Funds III
- LEI: 5493006PUI6YFKF2EE10
- Net assets: $3.6B
- Total assets: $3.7B
- As of: 2026-03-31
- Type: Index

## Advisers

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

## Top holdings (1 reported)

| Holding | Ticker | Value | % of fund |
| --- | --- | --- | --- |
| MASTER INVESTMENT PORTFOLIO | — | $3.6B | 10040.97% |

## Net asset history

| Report date | Net assets |
| --- | --- |
| 2026-03-31 | $3.6B |
| 2025-12-31 | $3.7B |
| 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: BlackRock Funds III](https://search.stillhousedata.com/registrant/893818)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/fund/S000004270.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.