5月15日电，香港交易所信息显示，中国石油化工集团有限公司在中国石油化工股份的持股比例于05月14日从4.34%升至5.59%。

Group 1 - The core point of the article is that China Petroleum & Chemical Corporation increased its stake in China Petroleum & Chemical Corporation from 4.34% to 5.59% on May 14 [1] Group 2 - The increase in shareholding indicates a growing confidence in the company's performance and potential [1] - This change in ownership structure may influence market perceptions and investor sentiment towards China Petroleum & Chemical Corporation [1] - The transaction reflects ongoing strategic moves within the energy sector in China [1]