IUSB — iShares Core Universal USD Bond ETF

IUSB Price Performance — Growth of $10,000

Value of a $10,000 investment in IUSB over time, compared with SPY. Both lines are rebased to $10,000 on the first shared date. Based on total returns — prices are adjusted for dividends and splits, so this assumes distributions were reinvested. Hover or tap the chart for exact values.

IUSB Drawdown

The "underwater" chart: IUSB's decline from its highest prior value at each point in time. It shows how deep past losses ran and how long the fund took to recover to break-even.

Overview

The iShares Core Universal USD Bond ETF (IUSB) is a broad US bond fund issued by iShares with $43.8 billion in assets under management. It holds a C grade (57.4/100) and ranks 3 of 7 within its category, placing it 273rd among all tracked ETFs. The fund’s 0.06% expense ratio exceeds the category median of 0.03%, while its 4.29% dividend yield sits slightly above the peer average of 4.20%. Top holdings represent only 6.7% of assets, with the largest single position being Blackrock Liquidity Tempcash at 2.9%.

Price performance shows a divergence between short-term weakness and longer-term gains, with the fund down 0.78% over six months but up 1.66% over one year. Over three years, the fund has delivered a 15.14% return, though price history is available for only 3.0 years. The current price of $45.25 sits at 6.2% of its 52-week range, indicating it is near the lower end of recent trading levels. The ETFValuer grade has remained unchanged at C across the last 35 tracked days.

With a volatility of 3.53% labeled Very Low and a beta of 0.96, the fund has exhibited relatively stable price movements compared to the broader market. A Sharpe ratio of -0.95 suggests that risk-adjusted returns have been negative over the measured period, despite a modest maximum drawdown of -4.39%. Liquidity is supported by an average daily volume of 3,443,053 shares and a tight bid/ask spread of 0.13%.

AI-generated summary based on the data on this page.

IUSB Top Holdings

Holdings as of 2026-04-30 per the fund's most recent SEC N-PORT-P filing. Top 10 holdings make up 6.7% of net assets — a rough gauge of concentration risk (the higher this figure, the more the fund's return depends on a handful of names). To see how IUSB's holdings overlap with other ETFs you own or are considering, check the Stock Overlap tool.

Which Funds Overlap With IUSB

Holding two funds that own the same companies adds cost and complexity without adding much diversification. These tracked ETFs share the most names with IUSB's top 10 — SHV overlaps most, holding 2 of the same companies as IUSB's top 10 (3.8% of IUSB's assets).

Compares the top 10 reported holdings of each fund, so it's a floor on true overlap — two S&P 500 trackers overlap ~100% even when only 10 names are listed. Use the Stock Overlap tool to search by individual company.

Market Backdrop

10-Year Treasury Yield: 4.77% (as of 2026-09-03) — The yield on 10-year US Treasury bonds — the standard "risk-free rate" benchmark used to contextualize this fund’s Sharpe ratio and returns.

CBOE Volatility Index (VIX): 14.32 (as of 2026-09-03) — A real-time gauge of expected S&P 500 volatility over the next 30 days — useful context for this fund’s own volatility label.

Federal Funds Rate: 3.63% (as of 2026-08-01) — The Federal Reserve’s target policy rate, which anchors short-term borrowing costs across the economy.

IUSB Liquidity, Domicile & Tax Treatment

Liquidity: Quoted bid/ask spread is 0.13% and average daily volume is 3.4M/day. Tighter spreads and higher volume mean lower round-trip trading costs; this is a live-market snapshot and can widen during volatile sessions. AUM of $43.8B provides ample scale, supporting tight spreads and issuer commitment to keep the fund open.

Domicile & tax treatment: IUSB is a US-domiciled, SEC-registered ('40 Act) exchange-traded fund. Dividends and capital gains distributions are reported to US investors on Form 1099-DIV, and the fund is not subject to the PFIC reporting or UCITS-specific rules that apply to Irish- or Luxembourg-domiciled funds. Non-US investors should note that US-domiciled ETFs are generally subject to 30% US withholding tax on dividends (unless reduced by treaty) and to US estate tax exposure on the position — Irish-domiciled UCITS ETFs tracking the same index often avoid both, which is why non-US residents frequently prefer the UCITS equivalent where one exists. This is general information, not tax advice — consult a tax professional for your situation.

IUSB Performance History

How IUSB Compares to Other US Bonds - Broad ETFs