▁S Z SE ▁ 2 0 0 ▁Index ▁( mid ▁cap ▁index ). ▁ ▁History ▁H ua ig ang ▁Group ▁Co ., ▁Ltd . ▁() ▁was ▁incorpor ated ▁on ▁ 1 1 ▁December ▁ 1 9 9 6 ▁as ▁a ▁subs idi ary ▁of ▁the ▁Econom ic ▁Commission ▁of ▁Hu ai ' an ▁( the ▁city ▁was ▁known ▁as ▁Hu ai y in ▁at ▁that ▁time ) ▁for ▁ 9 1 . 9 7 % ▁st ake . ▁In ▁ 2 0 0 0 , ▁Nan j ing ▁Iron ▁and ▁Ste el ▁Group ▁acquired ▁the ▁cont rolling ▁st ake ▁( 9 3 . 4 9 %). ▁It ▁was ▁rec ap ital ized ▁in ▁ 2 0 0 3 , ▁making ▁the ▁st ake ▁held ▁by ▁Nan j ing ▁Iron ▁and ▁Ste el ▁Group ▁was ▁dil uted ▁to ▁ 2 6 . 1 5 %. ▁Moreover , ▁private ▁invest ors ▁were ▁introduced . ▁In ▁ 2 0 0 5 , ▁the ▁ 2 6 . 1 5 % ▁st ake ▁was ▁returned ▁to ▁Hu ai ' an ▁Municipal ▁People ' s ▁Government ▁from ▁Nan j ing ▁Iron ▁and ▁Ste el ▁Group . ▁In ▁June ▁ 2 0 0 6 , ▁priv ately ▁held ▁company ▁Sh ag ang ▁Group ▁acquired ▁ 6 4 . 4 0 % ▁st ake ▁of ▁H ua ig ang ▁from ▁other ▁private ▁invest ors . ▁The ▁st ake ▁was ▁inject ed ▁to ▁a ▁public ly ▁trad ed ▁company ▁Ga ox in ▁Z hang t ong ▁as ▁a ▁reverse ▁IP O