What Is IUSB? iShares Core Universal USD Bond ETF

IUSB is iShares Core Universal USD Bond ETF, an ETF that tracks a broad US bond index with a credit tilt at a 0.06% expense ratio. IUSB holds broad US bond with a credit tilt, bundled into one ticker. It launched in 2014. At 0.06% it undercuts the typical core-plus bond fund, which runs nearer 0.34%. It distributes about 4.21%, and that payout moves with rates rather than being fixed.

IUSB is issued by iShares and tracks a broad US bond index with a credit tilt, so a single ticker gives you the whole portfolio of underlying holdings weighted by the index's methodology rather than by any active stock-picking.

IUSB is weighted toward its largest constituents. As of August 2026, the top holdings are:

The remaining holdings make up the balance of the fund, with weights tapering off below the top names. Because the index reconstitutes on a rolling basis, the roster stays current without active management. Each ticker above links to its individual stock guide in Walnut.

There are three common ways to get IUSB exposure. Buy shares (or fractional shares) of IUSB directly at any major broker that lists it. Hold it as a core position and layer more concentrated ideas on top. Or build it into a thematic portfolio in Walnut, so IUSB sits alongside other holdings that express the same thesis, with target weights you can rebalance toward. IUSB trades like a stock during market hours, so you buy it the same way you would any listed share.

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Whether IUSB is a good buy depends less on any single call and more on your time horizon and what you already hold: it tracks a broad US bond index with a credit tilt, so the real question is whether you want that exposure in your mix and at what weight. We walk through valuation, concentration, and what would have to be true for it to outperform from here in is IUSB a buy?

IUSB gives you a broad US bond index with a credit tilt exposure in one ticker at a 0.06% expense ratio. Most investors use it as a core holding and layer more concentrated thematic portfolios on top.

Whether IUSB is worth buying today depends more on your time horizon and what you already hold than on any single call. We walk through valuation, concentration, and what would have to be true for it to outperform from here in is IUSB a buy?

IUSB yields 4.21% as of August 2026, paid by passing through the dividends of its underlying holdings. For the payout schedule, history, and how the distributions are taxed, see IUSB dividend: yield and schedule.

New to funds like IUSB? Start with what an ETF is, then how to buy an ETF, or browse the full guide to ETF investing.