港交所文件显示：中国石化于12月11日斥资1100万港元回购250万股H股。

Group 1 - The core point of the article is that China Petroleum & Chemical Corporation (Sinopec) has repurchased 2.5 million H-shares at a cost of HKD 11 million on December 11 [1] Group 2 - The repurchase indicates Sinopec's confidence in its stock value and aims to enhance shareholder returns [1] - The transaction reflects ongoing trends in the market where companies are actively engaging in share buybacks to support their stock prices [1] - The amount spent on the buyback is relatively modest compared to Sinopec's overall market capitalization, suggesting a strategic approach rather than a significant financial burden [1]