AGG owns virtually the entire U.S. investment-grade bond market in a single fund, giving you exposure to Treasuries, corporate bonds, mortgage-backed securities, and government agency debt. It's the bond market's equivalent of owning the S&P 500 — a one-stop shop for core fixed income exposure.
How It Works
The fund tracks the Bloomberg U.S. Aggregate Bond Index, which includes over 10,000 bonds weighted by market value. It maintains an intermediate duration around 6-7 years and holds only investment-grade debt (BBB or higher). The portfolio rebalances monthly to capture new issuance and remove bonds approaching maturity. About 40% sits in Treasuries, 25% in mortgage-backed securities, 25% in corporates, with the rest in agencies.
Key Features
- Captures 95%+ of the U.S. investment-grade bond market in one trade
- Rock-bottom expenses make it cheaper than buying individual bonds for most investors
- Monthly distributions provide steady income stream averaging around 3-4% annually
Risks
- Duration of 6-7 years means a 1% rate rise knocks off about 6-7% in price — painful in rising rate environments
- Zero high-yield exposure means you miss the 2-3% extra yield available in junk bonds during stable markets
- Mortgage-backed securities can extend duration unexpectedly when rates rise, amplifying losses beyond Treasury-only funds
Who Should Own This
Perfect for investors who want their entire bond allocation handled in one fund without thinking about it. Works best as the defensive ballast in a 60/40 portfolio or as the core holding for retirees living off distributions. If you're trying to beat inflation or generate higher income, you'll need to look elsewhere — this is about stability and diversification, not returns.