今日共91只个股发生大宗交易，总成交68.89亿元

Group 1 - A total of 91 stocks in the A-share market experienced block trading today, with a total transaction value of 6.889 billion yuan [1] - The top three stocks by transaction value were Pudong Development Bank at 4.531 billion yuan, Guangqi Technology at 224 million yuan, and Hengli Petrochemical at 200 million yuan [1] - Among the stocks, 23 traded at par, 7 at a premium, and 61 at a discount; Zhejiang Meida, Luxiao Technology, and Shanying International had the highest premium rates of 9.81%, 5.06%, and 2.05% respectively [1] Group 2 - The top stocks by institutional buying were Shengyi Electronics at 76.9341 million yuan, Dameng Data at 76.6407 million yuan, and Shenghong Technology at 76.1339 million yuan [2] - Other notable institutional purchases included Juguang Technology at 67.405 million yuan and Huatu Shanding at 62.62 million yuan [2] - A total of 20 stocks were highlighted in the institutional buying rankings, indicating strong interest in these companies [2] Group 3 - The leading stock by institutional selling was Pudong Development Bank at 2.5 billion yuan, followed by Shenghong Technology at 76.1339 million yuan and Cambricon Technologies at 51.2527 million yuan [3] - Other significant sell-offs included Donghua Energy at 16.9625 million yuan and Chuanheng Co. at 9.0578 million yuan [3] - The data indicates a concentrated selling activity in a few key stocks, particularly in the financial and technology sectors [3]