Agency MBS
Asset-Backed Securities glossary · Collateral & Cash Flow Modeling
Definition
MBS issued or guaranteed by GSEs (Fannie Mae, Freddie Mac) or Ginnie Mae; carries explicit or implicit US government backing on principal and interest.
Agency MBS in plain English
A mortgage-backed security (MBS) is basically a share in a giant pile of home loans — you buy in, and you collect a cut of the homeowners' monthly payments. "Agency MBS" are the ones packaged or guaranteed by a few huge, government-linked housing companies (Fannie Mae, Freddie Mac, Ginnie Mae). The key perk: if homeowners stop paying, these agencies make sure you still get your principal and interest, backed by the U.S. government — either as an ironclad promise (Ginnie Mae) or a widely-trusted one (Fannie/Freddie). That safety net is why investors treat them as some of the lowest-risk bonds around.
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