ISTB Performance — iShares Core 1-5 Year USD Bond ETF
Data updated: 2026-09-25
ISTB returned +0.64% year to date and +3.30% over one year to Jul 2026. Annualised returns are +4.94% over 3 years and +1.87% over 5 years. The fund beat its Short-Term Government Bond category average: $100 invested three years ago grew to $116, against $114 for the category, and to $103 over one year, against $103. Volatility over the past three years was 2.33% a year. In the 12 months to Jul 2026 the fund took in a net $745.6M, and assets reached $5.13B.
ISTB Growth of $100
What $100 invested in iShares Core 1-5 Year USD Bond ETF grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Short-Term Government Bond category average over the same months.
| Period | ISTB | Category average |
|---|---|---|
| 1 year (Aug 2025 – Jul 2026) | $103 | $103 |
| 3 years (Aug 2023 – Jul 2026) | $116 | $114 |
| 5 years (Aug 2021 – Jul 2026) | $110 | $110 |
| Since data start (Aug 2019 – Jul 2026) | $117 | $118 |
ISTB Trailing Returns
Total returns to Jul 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +0.64% |
| 1 year | +3.30% |
| 3 years (annualised) | +4.94% |
| 5 years (annualised) | +1.87% |
ISTB Annual Returns
Calendar-year total returns of iShares Core 1-5 Year USD Bond ETF, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jul) | +0.64% |
| 2025 | +6.41% |
| 2024 | +4.34% |
| 2023 | +5.57% |
| 2022 | −6.10% |
| 2021 | −0.60% |
| 2020 | +4.76% |
| 2019 (Aug–Dec) | +1.49% |
ISTB 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 | +0.3% | +0.7% | −0.8% | +0.3% | +0.1% | +0.1% | −0.1% | — | — | — | — | — |
| 2025 | +0.6% | +1.0% | +0.4% | +0.8% | −0.1% | +0.9% | 0.0% | +1.1% | +0.3% | +0.4% | +0.5% | +0.3% |
| 2024 | +0.4% | −0.5% | +0.5% | −0.7% | +1.0% | +0.7% | +1.6% | +1.1% | +1.0% | −1.0% | +0.5% | −0.1% |
| 2023 | +1.5% | −1.2% | +1.7% | +0.5% | −0.4% | −0.4% | +0.5% | +0.2% | −0.5% | 0.0% | +1.9% | +1.7% |
| 2022 | −1.1% | −0.8% | −1.8% | −1.2% | +0.6% | −1.2% | +1.1% | −1.3% | −2.0% | −0.2% | +1.7% | 0.0% |
| 2021 | +0.1% | −0.2% | −0.2% | +0.3% | +0.3% | −0.1% | +0.3% | 0.0% | −0.3% | −0.5% | −0.1% | −0.1% |
| 2020 | +0.9% | +0.8% | −1.2% | +1.2% | +0.9% | +0.6% | +0.6% | +0.2% | −0.1% | 0.0% | +0.5% | +0.3% |
| 2019 | — | — | — | — | — | — | — | +0.9% | −0.1% | +0.4% | 0.0% | +0.4% |
ISTB Risk
Risk measures from monthly returns over Aug 2023 – Jul 2026.
- 3-year volatility (annualised): 2.33%
- 3-year Sharpe ratio: 0.19 (vs 4.5% risk-free rate)
- Best month: +1.95% (Nov 2023)
- Worst month: −0.98% (Oct 2024)
ISTB Fund Flows
Monthly money in and out of iShares Core 1-5 Year USD Bond ETF, from SEC Form N-PORT.
- 12-month net flow: $745.6M
- 12-month gross sales (incl. reinvestments): $910.7M
- Sales ÷ redemptions: 5.52×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jul 2026 | $110.5M | $0 | $110.5M |
| Jun 2026 | $322.8M | $0 | $322.8M |
| May 2026 | $19.3M | $29.0M | −$9.7M |
| Apr 2026 | $19.4M | $9.7M | $9.7M |
| Mar 2026 | $9.7M | $34.0M | −$24.4M |
| Feb 2026 | $34.1M | $0 | $34.1M |
| Jan 2026 | $68.3M | $14.6M | $53.7M |
| Dec 2025 | $48.8M | $24.4M | $24.4M |
| Nov 2025 | $48.7M | $0 | $48.7M |
| Oct 2025 | $127.0M | $0 | $127.0M |
| Sep 2025 | $58.6M | $0 | $58.6M |
| Aug 2025 | $43.7M | $53.4M | −$9.7M |
ISTB Assets Under Management
Net assets of iShares Core 1-5 Year USD Bond ETF by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-07-31 | $5.13B |
| 2026-04-30 | $4.75B |
| 2026-01-31 | $4.77B |
| 2025-10-31 | $4.64B |
| 2025-07-31 | $4.43B |
| 2025-04-30 | $4.54B |
| 2025-01-31 | $4.28B |
| 2024-10-31 | $4.09B |
| 2024-07-31 | $4.16B |
| 2024-04-30 | $4.03B |
| 2024-01-31 | $4.15B |
| 2023-10-31 | $4.04B |
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.