In a Collateralized Mortgage Obligation, mortgages are pooled together and the resulting mortgage-backed securities are structured into tranches that prioritize the distribution of payments based on risk preferences. Investors in the higher-rated tranches receive payments first, while those in lower-rated tranches, which carry higher risk, receive payments later, potentially yielding higher returns.
The investment firm decided to diversify its portfolio by purchasing tranches from a Collateralized Mortgage Obligation to balance risk and return.