The claimed invention relates to an adjustable derivative contract. Particularly a method and system for adjusting the derivative contract to account for time value of money due to an occurrence of a corporate event that affects the value of the derivative contract. The claimed method and system allocates distributions amongst different derivative contracts, each derivative contract representing a different economic interest of at least two shares of an underlying security. The claimed invention uses the concepts of present and future values to value derivative contracts in order to more fairly and accurately represent the interests of the various holders of such derivative contracts upon the occurrence of a corporate event affecting the value of these derivative contracts.