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For an MBS, the word "option" in option-adjusted spread relates primarily to the right of property owners, whose mortgages back the security, to prepay the mortgage amount. Since mortgage borrowers will tend to exercise this right when it is favourable for them and unfavourable for the bond-holder, buying an MBS implicitly involves selling an ...
A mortgage-backed security (MBS) is a type of asset-backed security (an "instrument") which is secured by a mortgage or collection of mortgages. The mortgages are aggregated and sold to a group of individuals (a government agency or investment bank) that securitizes, or packages, the loans together into a security that investors can buy.
option-adjusted spread, or the extra yield demanded by the security holder to compensate for the mortgage repayment option; current-coupon spread; volatilities; convexity; cost of carry; While all these factors can be important in accounting for changes in MBS returns, in practice a particular user may only select a subset.
An options chain is a valuable tool that helps options traders make quick decisions and displays a range of relevant information at one glance.
The fact that MBS investors are exposed to downside prepayment risk, but rarely benefit from it, means that these bonds must pay an incrementally higher interest rate than similar bonds without prepayment risk, to be attractive investments. (This is the embedded "option cost" that results in a lower option-adjusted spread.)
The term "asset-backed security" is currently defined in Form S-3 to mean a security that is primarily serviced by the cash flows of a discrete pool of receivables or other financial assets, either fixed or revolving, that by their terms convert into cash within a finite time period plus any rights or other assets designed to assure the ...
MBS instruments are commonly referred to as "pass-through" certificates because the principal and interest of the underlying loans is "passed through" to investors; because of Ginnie Mae's financial backing, these MBS instruments are particularly attractive to investors and, like other Agency MBS instruments, are eligible to be traded in the ...
Many American CMBS transactions carry less prepayment risk than other MBS types, thanks to the structure of commercial mortgages. Commercial mortgages often contain lockout provisions (typically a period of 1–5 years [ 2 ] where there can be no prepayment of the loan) which they can be subject to defeasance , yield maintenance and prepayment ...