Group of mortgage loans assembled to support a mortgage-backed security or investor transaction.
A mortgage pool is a group of mortgage loans assembled together to support a mortgage-backed security or another investor transaction.
Mortgage pool matters because a borrower has one loan, but the secondary market often analyzes loans in groups. Pooling helps explain why similar loans may be standardized, sold together, and used to create securities.
The term also matters because pooled loans can keep being serviced borrower by borrower. A loan can become part of a pool without changing the borrower’s note terms or monthly payment obligations.
Borrowers usually encounter mortgage-pool concepts indirectly after closing, when a loan is sold, delivered, or securitized.
The term becomes practical when a borrower wants to understand how an individual mortgage can support a broader Mortgage-Backed Security (MBS) market.
| Step | What happens |
|---|---|
| Individual loans close | Borrowers sign separate mortgages |
| Loans are grouped | Similar loans are assembled into a pool |
| Pool characteristics are measured | Pool factor, weighted average coupon, maturity, and loan age summarize the grouped loans |
| Pool supports a security | Investors receive exposure to the pooled cash flow |
| Servicing continues | Borrowers still make payments through the servicing system |
A pool may also become a Specified Pool when the actual pool is identified for delivery, trading, or analysis instead of being described only by generic characteristics.
A lender closes hundreds of similar fixed-rate mortgages. Those loans are assembled into a mortgage pool that supports an agency MBS. Each borrower still has an individual mortgage, but investors look at the grouped pool.
Mortgage pool differs from Securitization because pooling is one step in the process, while securitization is the broader conversion of loans into securities.
It also differs from Whole Loan. A whole loan is one mortgage asset sold intact, while a mortgage pool groups many loans.
It also differs from Specified Pool because specified pool emphasizes that the actual pool has been named and evaluated for delivery or trading.