What is Delta One?
1.
In financial derivatives, where the hedge position corresponds one-for-one with the notional of the derivative.
This is always true of forwards and swaps: thus, Jérôme Kerviel, as a swaps trader, was on SocGen's Delta One desk.
The amount of money that Kerviel was making, as a Delta One trader with a 500K risk limit, was suspicious.
See