今日共73只个股发生大宗交易，总成交17.1亿元

Group 1 - A total of 73 stocks experienced block trading on the A-share market today, with a total transaction value of 1.71 billion yuan [1] - The top three stocks by transaction value were Antong Holdings (106 million yuan), Huatu Shanding (99.21 million yuan), and Enjie Co., Ltd. (91.05 million yuan) [1] - Among the stocks, 11 were traded at par, 7 at a premium, and 55 at a discount; the highest premium rates were for Nanda Optoelectronics (18.86%), Robotech (12.46%), and Antong Holdings (9.28%) [1] Group 2 - The top stocks by institutional buying were Huatu Shanding (89.01 million yuan), Changsha Bank (50.90 million yuan), and Mengguli (32.82 million yuan) [2] - The leading stocks by institutional selling included Dayang Electric (58.95 million yuan), Huicheng Vacuum (42.70 million yuan), and Siyuan Electric (19.63 million yuan) [2]