IUSB Performance — iShares Core Universal USD Bond ETF
Data updated: 2026-09-25
IUSB returned −0.41% year to date and +2.98% over one year to Jul 2026. Annualised returns are +4.21% over 3 years and −0.02% over 5 years. Against its Intermediate Core Bond category average the fund came out behind over three years but ahead over one: $100 invested three years ago grew to $113, against $113 for the category, and to $103 over one year, against $103. Volatility over the past three years was 5.40% a year. In the 12 months to Jul 2026 the fund took in a net $10.4B, and assets reached $43.00B.
IUSB Growth of $100
What $100 invested in iShares Core Universal USD Bond ETF grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Intermediate Core Bond category average over the same months.
| Period | IUSB | Category average |
|---|---|---|
| 1 year (Aug 2025 – Jul 2026) | $103 | $103 |
| 3 years (Aug 2023 – Jul 2026) | $113 | $113 |
| 5 years (Aug 2021 – Jul 2026) | $100 | $100 |
| Since data start (Aug 2019 – Jul 2026) | $110 | $110 |
IUSB Trailing Returns
Total returns to Jul 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | −0.41% |
| 1 year | +2.98% |
| 3 years (annualised) | +4.21% |
| 5 years (annualised) | −0.02% |
IUSB Annual Returns
Calendar-year total returns of iShares Core Universal USD Bond ETF, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jul) | −0.41% |
| 2025 | +7.47% |
| 2024 | +2.13% |
| 2023 | +6.20% |
| 2022 | −13.01% |
| 2021 | −1.28% |
| 2020 | +7.58% |
| 2019 (Aug–Dec) | +2.26% |
IUSB Monthly Returns
Monthly total returns as reported on SEC Form N-PORT.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | +0.2% | +1.5% | −1.8% | +0.3% | +0.3% | +0.3% | −1.2% | — | — | — | — | — |
| 2025 | +0.6% | +2.1% | 0.0% | +0.3% | −0.5% | +1.6% | −0.1% | +1.2% | +1.1% | +0.7% | +0.6% | −0.2% |
| 2024 | −0.1% | −1.2% | +0.9% | −2.3% | +1.7% | +0.9% | +2.3% | +1.5% | +1.4% | −2.3% | +1.1% | −1.6% |
| 2023 | +3.2% | −2.5% | +2.4% | +0.6% | −1.0% | −0.1% | +0.1% | −0.6% | −2.4% | −1.5% | +4.5% | +3.7% |
| 2022 | −2.1% | −1.4% | −2.6% | −3.7% | +0.5% | −2.0% | +2.5% | −2.6% | −4.3% | −1.1% | +3.8% | −0.5% |
| 2021 | −0.7% | −1.3% | −1.1% | +0.8% | +0.4% | +0.7% | +1.0% | −0.1% | −0.9% | −0.1% | +0.1% | −0.1% |
| 2020 | +1.8% | +1.5% | −2.0% | +2.1% | +0.9% | +0.8% | +1.8% | −0.6% | −0.2% | −0.4% | +1.3% | +0.3% |
| 2019 | — | — | — | — | — | — | — | +2.3% | −0.4% | +0.3% | 0.0% | +0.2% |
IUSB Risk
Risk measures from monthly returns over Aug 2023 – Jul 2026.
- 3-year volatility (annualised): 5.40%
- 3-year Sharpe ratio: -0.05 (vs 4.5% risk-free rate)
- Best month: +4.50% (Nov 2023)
- Worst month: −2.39% (Sep 2023)
IUSB Fund Flows
Monthly money in and out of iShares Core Universal USD Bond ETF, from SEC Form N-PORT.
- 12-month net flow: $10.4B
- 12-month gross sales (incl. reinvestments): $12.0B
- Sales ÷ redemptions: 7.50×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jul 2026 | $920.3M | $377K | $919.9M |
| Jun 2026 | $3.0B | $120K | $3.0B |
| May 2026 | $3.2B | $0 | $3.2B |
| Apr 2026 | $417.2M | $30K | $417.2M |
| Mar 2026 | $695.6M | $124K | $695.4M |
| Feb 2026 | $716.4M | $11K | $716.4M |
| Jan 2026 | $545.8M | $117 | $545.8M |
| Dec 2025 | $782.0M | $2K | $782.0M |
| Nov 2025 | $584.1M | $42.0M | $542.1M |
| Oct 2025 | $313.9M | $173.8M | $140.1M |
| Sep 2025 | $225.2M | $1.4B | −$1.2B |
| Aug 2025 | $573.0M | $12K | $573.0M |
IUSB Assets Under Management
Net assets of iShares Core Universal USD Bond ETF by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-07-31 | $43.00B |
| 2026-04-30 | $36.54B |
| 2026-01-31 | $35.09B |
| 2025-10-31 | $33.34B |
| 2025-07-31 | $33.17B |
| 2025-04-30 | $33.18B |
| 2025-01-31 | $32.32B |
| 2024-10-31 | $33.20B |
| 2024-07-31 | $29.23B |
| 2024-04-30 | $27.57B |
| 2024-01-31 | $26.25B |
| 2023-10-31 | $21.30B |
For information only. Not investment advice: figures are as reported in SEC filings and may contain errors or be out of date. Past performance does not guarantee future results.