iShares Core 1-5 Year USD Bond ETF

iShares Core 1-5 Year USD Bond ETF (ISTB) is a BlackRock index fund that tracks the Bloomberg U.S. Universal 1-5 Year Index. That index is a broad mix of U.S. dollar bonds that mature in one to five years. It holds mostly Treasuries and corporate bonds, but it can also own some high-yield (“junk”) bonds. It charges 0.06% a year. That is below the 0.08% average of similar funds but above Vanguard Short-Term Bond ETF’s 0.03%.

• Over the year to Oct 27, 2026, ISTB returned +1.1%, 4th of 8 among similar funds.
• Its 5-year annualized return was +2.0% and its 10-year +2.2%.
• In the 2020 COVID crash it fell 6.1% and regained its old high 1.9 months after the low.
• Its worst full calendar year was 2022 (-6.1%); its best was 2025 (+6.4%).
• The deepest fall in its price history was 9.3% (Aug 3, 2021 to Oct 20, 2022), recovered by Jul 11, 2024.

As of Jul 31, 2026, the fund held 7,408 securities; the ten largest made up 8.31% of assets.

The bonds mature in 3.5 years on average (weighted by size), with an average coupon of 3.99%.

• Over the three months to Jul 31, 2026, investors added a net $423.6M (creations minus redemptions, per the N-PORT report).
• Monthly total returns reported for that quarter: +0.14%, +0.11%, -0.09%.

ISTB tracks the Bloomberg U.S. Universal 1-5 Year Index. The index covers taxable U.S. dollar bonds with one to five years left until they mature. Bonds can be rated investment grade or high yield (lower-rated “junk” bonds). It includes Treasuries, government-related debt, corporate bonds, mortgage-backed and other asset-backed securities, and dollar bonds from emerging markets. Municipal bonds and euro-denominated bonds are excluded. Bonds are weighted by market value, so larger issues count for more. The index rebalances on the last day of each month.

BlackRock does not buy every bond in the index. It uses representative sampling: it holds a subset of bonds picked to match the index’s duration (how sensitive prices are to interest rates), credit quality, yield and sector mix. At least 80% of assets go into index bonds or equivalent mortgage contracts. Up to 10% can go into futures, options, swaps or other bonds that help it track the index. As of July 31, 2026, the fund held 7,408 bonds: 51.95% U.S. Treasuries, 35.25% corporate bonds and 6.26% foreign government debt.

The fund often buys mortgage bonds through “to-be-announced” contracts, where the exact loans are fixed only days before settlement. Until then, it holds cash in short-term investments, including BlackRock money market funds, whose fees it also pays. It may lend out up to one-third of its assets.

• ISTB charges 0.06% a year, versus an average of 0.08% for the similar funds below (4th of 8, cheapest first).
• Using the prospectus's standard example, $10,000 invested would cost about $6 in the first year and $77 over 10 years (assuming a 5% annual return).

Its bonds average 3.5 years to maturity and its one-year beta against the stock market is 0.05, so it has moved far less than stocks, though it has still had losses.

ISTB launched in October 2012, so it has no record from the 2008 financial crisis. In the 2020 COVID crash it fell 6.1% between March 6 and March 19, 2020, then recovered by mid-May. Rising interest rates hurt it more. 2022 was its worst calendar year, at -6.1%. Its deepest drop was 9.3%, from August 2021 to October 2022, and it took about 21 months to recover, in July 2024. Anyone who had to sell shares for spending money during that stretch would have locked in losses.

It pays income monthly, with a trailing 12-month yield of 4.33% as of October 27, 2026. Costs are low at 0.06% a year: about $77 over ten years on $10,000 in the SEC’s standard example. Past results don’t predict future ones, and a plan should look at the whole portfolio, not one fund.

Matched by bond funds with the closest average maturity and issuer mix (N-PORT).