000630 Shenzhen.

The current code classification is as follows: those starting with 600, 601 and 603 are Shanghai A shares; those starting with 000, 002 and 300 are Shenzhen A shares, which are the main board, small and medium-sized board and GEM respectively; 200 is Shenzhen B shares; 900 is Shanghai

B shares; others include 500, 110, 111, etc. which are funds or bonds, etc.