ian ▁W et ▁contract s ), ▁or ▁physical ▁delivered ▁through ▁Shang hai ▁Sh ipping ▁Fre ight ▁Exchange . ▁▁ ▁FF As ▁are ▁often ▁trad ed ▁over - the - counter , ▁through ▁bro ker ▁members ▁of ▁the ▁For ward ▁Fre ight ▁Ag re ement ▁Bro k ers ▁Association ▁( FF AB A ), ▁such ▁as ▁Ar row ▁Fut ures , ▁Clark son ' s ▁Sec ur ities , ▁Mare x ▁Spect ron , ▁SS Y ▁- ▁Sim pson ▁Sp ence ▁Young , ▁Bra em ar ▁Se as cope ▁L TD , ▁Fre ight ▁In vest or ▁Services , ▁B GC ▁Part ners , ▁G FI ▁Group , ▁AC M ▁Sh ipping ▁Ltd , ▁B RS , ▁Trad ition - Pl at ou ▁and ▁IC AP . ▁However , ▁screen - based ▁trad ing ▁is ▁becoming ▁more ▁popular ▁, ▁through ▁various ▁screens . ▁Tr ades ▁can ▁be ▁given ▁up ▁for ▁clear ing ▁by ▁the ▁bro ker ▁to ▁one ▁of ▁the ▁clear ing ▁houses ▁that ▁support ▁such ▁tr ades , ▁or ▁be ▁executed ▁in ▁integrated ▁electronic ▁exchange . ▁There ▁are ▁five ▁clear ing ▁houses ▁for ▁fre ight : ▁N OS ▁Clear ing / N AS DA Q ▁O M X , ▁E EX , ▁C ME ▁Clear port , ▁I CE ▁Fut ures ▁Europe ▁and ▁S G X , ▁and ▁one ▁electronic ▁exchange : ▁Shang hai ▁Sh ipping ▁Fre ight ▁Exchange . ▁Fre ight ▁derivatives ▁are ▁primarily ▁used ▁by ▁ship own ers ▁and ▁operators , ▁oil ▁companies , ▁trad ing ▁companies , ▁and ▁gra in