Factor Exposure Analysis 120: Risk & Return Contribution Analysis of Fixed Income Strategies

Bonds provide uncorrelated returns to stocks, right?

Nicolas Rabener
10 min read
10 Aug 2026

SUMMARY

  • Fixed income markets are diverse, and so are their risk & return drivers
  • Contribution analysis helps identify hidden risks
  • Many bond types are unattractive given high correlations to equities

INTRODUCTION

iShares’ Core U.S. Aggregate Bond ETF (AGG) is the largest bond fund, with $140 billion in assets, and a cornerstone holding in traditional equity/bond portfolios. Yet most investors would likely struggle to say precisely what AGG holds. The consensus guess would be “U.S. investment-grade bonds” – but what does that actually mean in practice?

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