IUSB — iShares Core Total USD Bond Market ETF
Data updated: 2026-06-26
IUSB — iShares Core Total USD Bond Market ETF data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Intermediate Total / Aggregate Bond · $36.54B AUM · 0.06% expense ratio · 4.6% 1-yr return. From SEC regulatory filings.
IUSB Fund Overview
IUSB — iShares Core Total USD Bond Market ETF is a US ETF managed by iSHARES TRUST, 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 ETF
- Manager: iSHARES TRUST
- Category: Intermediate Total / Aggregate Bond
- Assets under management: $36.54B
- 1-year return: 4.6%
- Ticker: IUSB
- SEC CIK: 0001100663
- SEC series ID: S000045644
- Share class ID: C000141927
IUSB Holdings
Top 10 holdings of iShares Core Total USD Bond Market ETF by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Blackrock Liquidity Tempcash | 2.88% |
| BlackRock Funds III | 0.93% |
| United States of America | 0.37% |
| United States of America | 0.37% |
| United States of America | 0.37% |
| United States of America | 0.37% |
| United States of America | 0.36% |
| United States of America | 0.36% |
| United States of America | 0.36% |
| United States of America | 0.35% |
IUSB Portfolio Allocation
Asset-class allocation of iShares Core Total USD Bond Market ETF by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 76.8% |
| Securitized | 21.6% |
| Cash & Equivalents | 3.8% |
IUSB Performance
Total returns for IUSB (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 0.2% |
| 1 year | 4.6% |
| 3 years (annualised) | 4.1% |
| 5 years (annualised) | 0.5% |
IUSB Risk Information
Risk metrics for IUSB, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 3.3%
IUSB Costs and Fees
IUSB costs about $6 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.06%
- Gross expense ratio: 0.06%
- Portfolio turnover: 65%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
IUSB Cashflows
Over the 12 months to 2026-04, iShares Core Total USD Bond Market ETF had net inflows of $3.29B, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-04 | $417.21M |
| 2026-03 | $695.44M |
| 2026-02 | $716.39M |
| 2026-01 | $545.80M |
| 2025-12 | $782.01M |
| 2025-11 | $542.10M |
IUSB Debt Constituents
Largest debt holdings of iShares Core Total USD Bond Market ETF by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| United States of America | 0.37% |
| United States of America | 0.37% |
| United States of America | 0.37% |
| United States of America | 0.37% |
| United States of America | 0.36% |
| United States of America | 0.36% |
| United States of America | 0.36% |
| United States of America | 0.35% |
| United States of America | 0.34% |
| United States of America | 0.34% |
IUSB Prospectus and SEC Filings
Official iShares Core Total USD Bond Market ETF filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
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.