"Proprietary trading" . "prop trading" . "prop trader" . . . . . "proprietary traders" . "proprietary trader" . "taken short positions against mortgage derivatives" . . "proprietary designs" . "proprietary trading companies" . "proprietary trading" . "share trading" . "trading on its own account" . . "proprietary operation" . "proprietary fund" . "proprietary" . "Proprietary trading" . "trading" . "prop desk" .