Asset Backed Securities are bonds in which the coupon interest and the repayment of the bond are based on collateral of packages of different types of loans. This concerns, for example, packages of mortgages and car financing. We also refer to Asset Backed Securities as repackaged loans. The issuers may issue the underlying packages in different tranches (parts). Each tranche has its own credit risk.
Investing in Asset Backed Securities is risky. This is because it is often unclear what exactly the collateral consists of. It is also difficult to estimate the risk of large groups of people being unable to repay their mortgages or loans. This makes the credit risk of Asset Backed Securities much more unclear than the credit risk of a regular bond, where the credit risk consists only of the risk that the issuer cannot repay the bond.
Asset Backed securities were one of the main causes of the US credit crisis in 2007, the collateral consisted mainly of mortgage packages with a variable rate. When mortgage rates soared, many US citizens were unable to repay that higher interest rate on their mortgage or even the entire mortgage. As a result, the Asset Backed Securities very quickly lost all of their value or had very little value left.