
Structured finance is a sector of finance, specifically financial law that manages leverage and risk. Strategies may involve legal and corporate restructuring, off balance sheet accounting, or the use of financial instruments.

Accumulators are financial derivative products sold by an issuer (seller) to investors that require the buyers to buy shares of some underlying security at a predetermined strike price, settled periodically. This allows the investor to "accumulate" holdings in the underlying security over the term of the contract; this then constitutes a structured product.

An asset-backed securities index is a curated list of asset-backed security exposures that is used for performance bench-marking or trading.

An asset-backed security (ABS) is a security whose income payments and hence value are derived from and collateralized by a specified pool of underlying assets.

A collateralized debt obligation (CDO) is a type of structured asset-backed security (ABS). Originally developed as instruments for the corporate debt markets, after 2002 CDOs became vehicles for refinancing mortgage-backed securities (MBS). Like other private label securities backed by assets, a CDO can be thought of as a promise to pay investors in a prescribed sequence, based on the cash flow the CDO collects from the pool of bonds or other assets it owns. Distinctively, CDO credit risk is typically assessed based on a probability of default (PD) derived from ratings on those bonds or assets.

A collateralized mortgage obligation (CMO) is a type of complex debt security that repackages and directs the payments of principal and interest from a collateral pool to different types and maturities of securities, thereby meeting investor needs.

Commercial mortgage-backed securities (CMBS) are a type of mortgage-backed security backed by commercial and multifamily mortgages rather than residential real estate. CMBS tend to be more complex and volatile than residential mortgage-backed securities due to the unique nature of the underlying property assets.

Credit enhancement is the improvement of the credit profile of a structured financial transaction or the methods used to improve the credit profiles of such products or transactions. It is a key part of the securitization transaction in structured finance, and is important for credit rating agencies when rating a securitization.
The federal takeover of Fannie Mae and Freddie Mac was the placing into conservatorship of the government-sponsored enterprises (GSEs) Federal National Mortgage Association and Federal Home Loan Mortgage Corporation by the U.S. Treasury in September 2008. A conservatorship isn't a takeover of the ownership, but a status to rehabilitate corporations. The warrant that the U.S. Treasury bought was only authorized to protect the taxpayer, therefore it will be cancelled once the Treasury recovers its investment. It was one of the financial events among many in the subprime mortgage crisis.

A mortgage-backed security (MBS) is a type of asset-backed security which is secured by a mortgage or collection of mortgages. The mortgages are aggregated and sold to a group of individuals that securitizes, or packages, the loans together into a security that investors can buy. Bonds securitizing mortgages are usually treated as a separate class, termed residential; another class is commercial, depending on whether the underlying asset is mortgages owned by borrowers or assets for commercial purposes ranging from office space to multi-dwelling buildings.

A mortgage-backed security (MBS) is a type of asset-backed security which is secured by a mortgage or collection of mortgages. The mortgages are aggregated and sold to a group of individuals that securitizes, or packages, the loans together into a security that investors can buy. Bonds securitizing mortgages are usually treated as a separate class, termed residential; another class is commercial, depending on whether the underlying asset is mortgages owned by borrowers or assets for commercial purposes ranging from office space to multi-dwelling buildings.

Bonds securitizing mortgages are usually treated as a separate class, termed residential mortgage-backed security (RMBS). In that sense, making reference to the general package of financial agreements that typically represents cash yields that are paid to investors and that are supported by cash payments received from homeowners who pay interest and principal according to terms agreed to with their lenders; it is a funding instrument created by the "originator" or "sponsor" of the mortgage loan; without cross-collateralizing individual loans and mortgages, it is a funding instrument that pools the cash flow received from individuals and pays these cash receipts out with waterfall priorities that enable investors to become comfortable with the certainty of receipt of cash at any point in time.

In structured finance, a tranche is one of a number of related securities offered as part of the same transaction. In the financial sense of the word, each bond is a different slice of the deal's risk. Transaction documentation usually defines the tranches as different "classes" of notes, each identified by letter with different bond credit ratings.