BLST vs IUSB

BLSTBBluemonte Short Term Bond ETF

IUSBAiShares Core Universal USD Bond ETF

In short

BLST One ticket, an actively managed basket of short-duration bond ETFs: Treasuries, corporates, TIPS and securitized debt, with a four-year average maturity ceiling written into the prospectus. Rate risk kept on a short leash.

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

BLST The Fund seeks total return and income. It is actively managed and obtains at least 80% bond exposure, primarily through underlying funds holding short-duration debt securities.

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

• BLST The maturity leash is in the prospectus: underlying funds hold debt averaging no more than four years, five years max. Far less rate whiplash than a total bond index.sec.gov
• All-in cost is 0.22% net of a waiver through August 31, 2027 (0.27% gross), and that figure already includes the 0.02% the underlying ETFs charge. Below the category median.sec.gov
• Investment grade is the floor: underlying funds buy debt rated BBB/Baa or better at purchase. Income is paid out monthly.sec.gov
• What it owns matches what it says it owns, with the mix spread across government, corporate and securitized short paper.sec.gov

• 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

• BLST The index giants cost a fraction: AGG and BND charge 0.03%. Here you pay an active manager for duration and sector calls on top of the ETFs they buy.sec.gov
• It launched in 2025, so there is only a short record to judge, and it is not one of the category's heavily traded names.
• Distributions can include return of capital, which hands back your own money rather than income the portfolio earned.

• 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 BLST profile⁠

Full IUSB profile⁠