Why Vanguard Total Bond Market ETF Earns Gold

Key Morningstar Metrics for Vanguard Total Bond Market ETF BND

• Morningstar Medalist Rating
  : Gold
• Process Pillar
  : Above Average
• People Pillar
  : Above Average
• Parent Pillar
  : High

Vanguard Total Bond Market’s expansive portfolio and razor-thin fee preserve its advantage in the intermediate core bond

The fund tracks the Bloomberg US Aggregate Float Adjusted Index, which captures investment-grade, fixed-rate, taxable bonds denominated in US dollars. The index has different minimum size requirements for each type of bond, which helps the index remain investable given the large asset base following it. While it captures a broad swath of the bond market, the index excludes riskier types of bonds, such as eurodollar bonds, non-ERISA-eligible commercial mortgage-backed securities, and bonds with equity features. It weights selected holdings by market value after reducing the amount outstanding for bonds held by the Federal Reserve to adjust for float.

This weighting scheme tilts the fund toward the largest issuers, resulting in an overweight position in US Treasuries compared with category peers. The fund tends to park around 40%-50% of its assets in these instruments versus 30% for the category average. A heavy dose of Treasuries translates into a relatively high-quality portfolio. Over 70% of the portfolio carries a credit rating of AAA or AA, or around 10 percentage points higher than the category average as of February 2026.

This conservative risk profile can help performance during credit shocks. For instance, the fund outpaced its category average during both the 2008 global financial crisis and the March 2020 coronavirus drawdown. However, this can also hurt when credit risk pays off. This occurred most recently when credit spreads compressed after the volatile market in early April 2025. Its actively managed peers can lean into riskier assets to find pockets of opportunity.

Adjusting for float steers the index away from agency MBS compared with its category peers and the Bloomberg US Aggregate Bond Index—its non-float-adjusted counterpart. Still, this sector makes up around 20% of the portfolio, and it’s the fund’s third-largest sector allocation after Treasuries and corporate bonds.

The fund’s average duration has come back in line with the category average, standing at under 6.0 years as of February 2026. Recently, low interest rates incentivized issuers to borrow more for longer terms and thereby lengthened the market’s average duration. The fund’s portfolio reflected this trend even as some peers kept a tighter leash on interest rate risk. While issuance activities can tilt its duration profile, its muted credit risk is still the main driver of category-relative performance. The fund’s broad scope and low fee should also provide a long-term performance edge.

Vanguard Total Bond Market Index Fund: Performance Highlights

The fund’s exchange-traded fund share class outpaced the category average by 25 basis points annualized from its 2007 inception through February 2026. Much of the fund’s outperformance comes from a conservative risk profile and a Treasury-heavy portfolio. This provided better protection during credit shocks as investors fled to safe-haven assets like Treasuries. The fund outpaced the category average by 6.84 and 2.13 percentage points during the 2008 financial crisis and the coronavirus pandemic shock in March 2020, respectively. More recently, the fund beat the average peer during the volatile first quarter of 2025, though it failed to keep up during the subsequent credit rally.

Risk-on environments like these will continue to dent the fund’s excess returns. For instance, it trailed the category average by 38 basis points in 2024 as tight credit spreads slightly dented excess returns.

The fund does not currently take any duration bets compared with the category norm, but its average duration used to be slightly longer. This detracted from category-relative returns when yields on long-term bonds rose. Nonetheless, the fund’s main return driver is still its conservative credit risk profile. Tempering credit risk helped it outperform the category average by 20 basis points during the market meltdown in 2022 as safe assets fared relatively well that year.

Overall, the fund can be just as volatile as the category average, but its broad scope and low fee should provide a long-term performance edge.