An individual mortgage sold or held as a single asset instead of in a pooled security.
A whole loan is an individual mortgage sold or held as a single loan asset rather than as part of a pooled security.
Whole loan matters because not every mortgage moves immediately into a pooled security structure. Some loans are bought, sold, or held one at a time.
It also matters because borrowers can assume the only alternative to the original lender is securitization. Whole-loan transactions show that ownership can move without the loan being pooled into an MBS first.
The term also matters because it helps borrowers understand that the secondary market is not a single one-size-fits-all pipeline. Some loans are sold individually, others are pooled, and some may be held in portfolio.
Borrowers encounter whole-loan concepts indirectly through ownership changes and investor arrangements after closing.
The term becomes practical when a borrower wants to understand the difference between selling one loan and placing that loan inside a broader mortgage-backed pool.
| Structure | What is being transferred |
|---|---|
| Whole loan | One mortgage as a single asset |
| Securitization | A pool of many mortgages turned into securities |
| Portfolio Loan | A loan retained on a lender’s or investor’s own books rather than sold into a broader market outlet |
| Transfer choice | What the borrower may experience |
|---|---|
| Whole loan sale with servicing retained | Ownership moves, but the same company may still service the account |
| Servicing-Released whole-loan sale | Ownership and servicing setup change together |
| Securitization path | The loan moves into a broader pooled-security structure rather than remaining a one-loan asset |
A lender sells an individual mortgage intact to another institution without first pooling it into a security. That mortgage is being treated as a whole loan rather than as part of an MBS pool.
Whole loan differs from a Mortgage-Backed Security (MBS) because a whole loan is one loan asset, while an MBS is backed by a pool of many loans.
It also differs from Securitization, which is the pooling-and-security process rather than a one-loan transfer.
It also differs from a Loan Sale because loan sale is the event of transfer, while whole loan describes the form of the asset being transferred.
That distinction helps borrowers avoid mixing up the sale event with the market structure. A lender can sell a loan, keep servicing it, and still have that transfer happen as a one-loan asset move rather than as part of a mortgage pool.