Contract for a difference (DFD)

Over the counter contract between two parties to exchange at the close of contract the difference between the opening and closing price of an underlying asset. The seller will pay the buyer the difference between the current value of an asset and its value at contract time. (If the difference is negative, then the buyer pays instead to the seller). For example, when applied to equities, such a contract is an equity derivative that allows investors to speculate on share price movements, without the need for ownership of the underlying shares.
Contracts for difference allow investors to take long or short positions, and unlike futures contracts have no fixed expiry date, standardized contract or contract size. Trades are conducted on a leveraged basis with margins typically ranging from 1% to 30% of the notional value for CFDs on leading equities.