BTOT vs IUSB

BTOTBiShares Total USD Fixed Income Market ETF

IUSBAiShares Core Universal USD Bond ETF

In short

BTOT One ticket for the US dollar bond market, investment grade and high yield together, at 0.10% a year. iShares launched it in December 2025 as a wider take on core bond exposure than the usual index.

IUSB Most core bond funds stop at investment grade. IUSB keeps going, folding high-yield USD debt into the same wrapper across roughly 18,000 bonds, for 0.06% a year.

Stated mandate

BTOT The Fund seeks broad exposure to U.S.-dollar-denominated fixed-income securities spanning investment-grade and high-yield markets, while tracking its underlying index before fees and expenses.

IUSB The Fund seeks to track an index of U.S.-dollar-denominated bonds spanning investment-grade and high-yield sectors.

Why people hold it

• BTOT 0.10% a year against a 0.36% median for its broad-bond peer group. In fixed income, fee drag is one of the few variables you actually control.
• Investment grade and high yield in one wrapper, tracking the Bloomberg U.S. Total Fixed Income Market Index, so you are not stapling a separate high-yield sleeve onto a core fund yourself.ishares.com
• Roughly 1,100 bonds, so no single issuer carries much weight, held in a conventional 1940 Act fund from iShares.

• IUSB 0.06% a year, a fraction of what the typical broad bond fund in its category charges, and iShares has run it since 2014.
• Roughly 18,000 bonds spanning investment-grade and high-yield sectors, so one ticker covers ground a plain Agg tracker leaves on the table.ishares.com
• Tracks its index closely, trades heavily, and sits on a multi-billion-dollar asset base. Income is paid monthly.
• Among the strongest implementations in a crowded field of nearly 200 core bond funds.

Worth knowing

• BTOT The high-yield portion carries credit risk an investment-grade-only core bond fund does not, so it moves with credit spreads more than a plain Agg tracker.
• A December 2025 launch: short live record, and it began life thinly traded, so spreads can run wider than at long-established bond funds.
• Cheaper broad-bond options exist: BND, SPAB and SCHZ at 0.03%, iShares' own IUSB at 0.06%, each built on different index rules.

• IUSB That high-yield sleeve is the trade-off: more credit risk than an investment-grade-only fund, and more movement when spreads widen.
• BND, SPAB and SCHZ charge 0.03%, half IUSB's fee, but they stay inside investment grade.
• Payouts land monthly, but the amount floats with the coupons underneath. Nothing about the income stream is fixed.

Full BTOT profile⁠

Full IUSB profile⁠