iShares U.S. Aggregate Bond Index Fund
BlackRock Funds III · 1 share class
Fund classification
Classified from what the fund holds · as of 2026 Q2
iShares U.S. Aggregate Bond Index Fund is a U.S. equity index fund that tracks the Bloomberg U.S. Aggregate Bond Index.
- Asset class
- Equity
- Region
- United States
- Management
- Index (passive)
- Fund type
- Open-end fund
- Features
- Master-feeder
Fund profile
As filed in the prospectus · 2026 Q2
The investment objective of iShares U.S. Aggregate Bond Index Fund (the Fund ), a series of BlackRock Funds III (the Trust), is to seek to provide investment results that correspond to the total return performance of fixed-income securities in the aggregate, as represented by the Bloomberg U.S. Aggregate Bond Index (the Bloomberg U.S. Aggregate Index or the Underlying Index ).
The fund seeks to match the total return of the Bloomberg U.S. Aggregate Bond Index by investing in a representative sample of the approximately 14,006 investment-grade fixed-income securities in the index, including government bonds, corporate bonds, mortgage-backed securities, and asset-backed securities, with securities selected according to their relative weight in the index and characteristics such as credit quality, sector, and maturity. Because the fund invests in a representative sample rather than all index constituents, its returns may diverge from the index. The fund is structured as a feeder that invests all assets in a master portfolio.
| Share class | Expense ratio |
|---|---|
| WFBIX | 0.05% |
| C000099166 | 0.35% |
| C000099167 | 0.10% |
| C000201953 | 0.35% |
Portfolio turnover 93.00% · as of 2026 Q2
Allocation
Asset groups · long / short shown separately, never netted · 2026 Q2
| Stocks | 100.25% |
Latest quarter
What changed since the fund's previous filing
New and exited totals aren’t verifiable for this fund.
Return profile
Total return as filed — price change plus distributions reinvested · trailing figures to Apr 2026
May 2026 and Jun 2026 have been filed since the trailing figures were struck, so they are not in the table above or the curve — every figure here shares one cut-off, which is what makes them comparable with other funds.
This fund changed legal form during the period shown. The history above is continuous — it spans both eras, and the change is not a gap in reporting.
Holdings
By % of NAV · equity positions carry filed share counts · every resolvable issuer links to its company page
| Ticker | Issuer | %NAV | Reported price | Value | Shares |
|---|---|---|---|---|---|
| — | MASTER INVESTMENT PORTFOLIO | 100.25% | $9.09 | $3.28B | 360.8M |
Reported price is the fund's own reported value divided by its own reported shares at 2026-06-30 — not a live quote, and not what the fund paid.
Top 10 positions are 100.25% of net assets, top 25 100.25%, across 1 issuers.
See more of this fund's book
More positions with filed share counts, and the quarter-over-quarter change list rather than the largest few — free with an account, no card required.
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