今日共71只个股发生大宗交易，总成交25.22亿元

Group 1 - A total of 71 stocks experienced block trades in the A-share market on July 23, with a total transaction value of 2.522 billion yuan [1] - The top three stocks by transaction value were Rongsheng Petrochemical at 372 million yuan, Guoji Heavy Industry at 301 million yuan, and Hengli Petrochemical at 200 million yuan [1] - Among the stocks, 7 were traded at par, 5 at a premium, and 59 at a discount; the highest premium rates were for Dongfang Caifu at 18.09%, Yian Technology at 7.76%, and Tianci Materials at 0.99% [1] Group 2 - The top stocks by institutional buying were Desay SV at 95.05 million yuan, Shennong Development at 88.66 million yuan, and Meinian Health at 66.43 million yuan [2] - Other notable institutional purchases included Jinkong Power at 48.64 million yuan and Zhongfu Industrial at 46.90 million yuan [2] - The top stocks by institutional selling were Zhongke Software at 18.62 million yuan and ST Chenming at 0.95 million yuan [3]