▁issu ers , ▁security ▁hold ers ▁and ▁bro ker age ▁/ ▁clear ing ▁fir ms ▁to ▁move ▁stock ▁electron ically ▁between ▁one ▁another . ▁Transfer ▁agents , ▁as ▁limited ▁participants , ▁file ▁for ▁FA ST ▁participation . ▁D TC ▁appro ves ▁each ▁iss uer ▁on ▁a ▁mer it ▁review ▁basis ▁into ▁this ▁system . ▁ ▁What ▁are ▁“ ch ills ” ▁and ▁“ free zes ” ▁and ▁why ▁does ▁D TC ▁imp ose ▁them ? ▁Occ asion ally ▁a ▁problem ▁may ▁arise ▁with ▁a ▁company ▁or ▁its ▁se cur ities ▁on ▁depos it ▁at ▁D TC . ▁In ▁some ▁of ▁those ▁cases ▁D TC ▁may ▁imp ose ▁a ▁“ ch ill ” ▁or ▁a ▁“ free ze ” ▁on ▁all ▁the ▁company ' s ▁se cur ities . ▁A ▁“ ch ill ” ▁is ▁a ▁restriction ▁placed ▁by ▁D TC ▁on ▁one ▁or ▁more ▁of ▁D TC ' s ▁services , ▁such ▁as ▁limit ing ▁a ▁D TC ▁particip ant ' s ▁ability ▁to ▁make ▁a ▁depos it ▁or ▁withdraw al ▁of ▁the ▁security ▁at ▁D TC . ▁A ▁ch ill ▁may ▁remain ▁im posed ▁on ▁a ▁security ▁for ▁just ▁a ▁few ▁days ▁or ▁for ▁an ▁extended ▁period ▁of ▁time ▁depending ▁upon ▁the ▁reasons ▁for ▁the ▁ch ill ▁and ▁whether ▁the ▁iss uer ▁or ▁transfer ▁agent ▁correct s ▁the ▁problem . ▁A ▁“ free ze ” ▁is ▁a ▁dis continu ation ▁of ▁all ▁services ▁at ▁D TC . ▁Free zes ▁may ▁last ▁a ▁few ▁days ▁or ▁an ▁extended ▁period ▁of ▁time , ▁depending