Group 1 - The core point of the article is that Tunnel Corporation (SH 600820) announced the completion of a share buyback plan by Shanghai Urban Construction Group, which acquired approximately 62.88 million A-shares, accounting for 2% of the total share capital, with a total investment of about RMB 399 million [1][1][1] Group 2 - For the first half of 2025, Tunnel Corporation's revenue composition is as follows: construction business accounted for 84.3%, operational business 6.91%, investment business 3.38%, design services 2.39%, and financing leasing 1.41% [1][1][1] - As of the report date, Tunnel Corporation's market capitalization is RMB 20.9 billion [1][1][1]