Mortgage-Backed Securities (MBS)

Definition

Mortgage-backed securities, or MBS, are securities whose payments come from pools of mortgage loans. They are a secondary-market instrument, not a consumer loan product.

In plain English

Most home loans do not stay on the original lender’s books. Many are grouped and sold as securities. Those securities are mortgage-backed securities. A conventional or conforming loan is the consumer loan. MBS is the market instrument built from loans like those.

Technical definition

FHFA’s official MBS data identity is PRIMARY for the instrument. It does not turn MBS into a shopper product page.

Why it matters

Rate conversations often mention MBS. Readers need the market instrument kept distinct from the loan they sign.

Sources reviewed