[CUSIP No. 81941U105 (1) Names of reporting persons Zhongrong Shengda Investment Holdings (Hong Kong) Company Limited (2) Check the appropriate box if a member of a group (see instructions) ¨ x (a) (3) SEC use only (4) Source of funds (see instructions) BK (5) ¨ (6) Citizenship or place of organization Hong Kong Number of shares beneficially owned by each]