Non-Agency Mortgage-Backed Security

What is a non-agency mortgage-backed security?

A non-agency mortgage-backed security is backed by mortgage loans but is not issued or guaranteed by Fannie Mae, Freddie Mac, or Ginnie Mae. You may also see these investments called private-label MBS.

How it works

A private issuer places mortgage loans into a trust and sells securities backed by the payments from those loans. The security may be divided into classes, often called tranches, with different rights to cash flows and different positions in the loss structure. A senior class may receive payments first, while a junior class absorbs losses earlier.

Because there is no agency guarantee, the performance of the borrowers and the quality of the loans matter directly. Loan-to-value ratios, borrower credit, documentation, property type, geographic concentration, delinquencies, and the amount of credit protection can all affect results.

A simple example

Suppose a private trust pools mortgages that fall outside agency programs. It issues senior and junior securities. If loan losses stay low, both classes may receive their expected cash flows. If losses rise, the junior class may absorb them first, helping protect the senior class until that protection is used up.

The Fly High perspective

Fly High looks at non-agency credit performance because it can affect recurring earnings and dividend coverage. We keep earnings as the primary monitoring signal and use the underlying credit detail to understand what may be changing beneath it.

This article is for general education. It is not personal investment advice or a recommendation to buy or sell any security.