Description: U.S. bond markets have undergone dramatic changes due to the 2008 Global Financial Crisis (GFC) and the COVID-19 pandemic. In taking a retrospective view, we can see that bond markets, viewed through the lens of major bond indices, have been evolving for quite some time. Within this paper, TD Asset Management Inc. (TDAM) will explore underlying changes that have occurred within the U.S. Corporate Bond Index, a sub-component of the larger U.S. investment grade bond market, over the past decade. We will highlight key structural changes that have occurred within bond markets and why they are noteworthy