IUSB delivers the entire US dollar bond market in one trade — Treasuries, corporates, mortgages, and everything in between. It's the bond equivalent of buying VTI for stocks, giving you instant diversification across the full spectrum of investment-grade USD debt.
How It Works
The fund tracks the Bloomberg US Universal Index, which combines government bonds, investment-grade corporates, mortgage-backed securities, and dollar-denominated emerging market debt. With intermediate duration around 6 years, it maintains roughly 70% in government-related securities and 30% in corporates, rebalancing monthly to capture new issuance across all sectors.
Key Features
- Captures 99% of the investable USD bond universe in one holding, eliminating the need to mix multiple bond ETFs
- Includes emerging market USD bonds that most aggregate funds skip, adding 3-5% yield pickup on that sleeve
- Zero expense ratio makes it cheaper than buying Treasury and corporate ETFs separately
Risks
- 6-year duration means a 1% rate spike drops the fund ~6% — painful but not catastrophic for long-term holders
- Corporate allocation could lose 5-10% in a recession as credit spreads widen, though government holdings provide cushion
- Emerging market sovereign debt sleeve (5-7% of fund) can gap down 15-20% during global risk-off events
Who Should Own This
Perfect for investors who want their entire bond allocation handled in one fund without overthinking sector weights or duration targeting. Works best for buy-and-holders building a simple two or three-fund portfolio who want bond exposure but don't want to become bond market experts.