Group 1 - On December 19, a total of 29 stocks were involved with institutional investors, with 16 showing net buying and 13 showing net selling [1] - The top three stocks with the highest net buying by institutions were Zhejiang Shibao, Aerospace Intelligent Manufacturing, and Shanzi Gaoke, with net buying amounts of 121 million, 90.62 million, and 58.12 million respectively [1] - The top three stocks with the highest net selling by institutions were Tongyu Communication, Huangshi Group, and Suli Co., with net selling amounts of 93.20 million, 65.79 million, and 57.84 million respectively [1] Group 2 - Zhejiang Shibao had a price increase of 9.99% with a net institutional buying of 120.71 million [2] - Aerospace Intelligent Manufacturing saw a price increase of 16.30% with a net institutional buying of 90.62 million [2] - Shanzi Gaoke experienced a price increase of 9.93% with a net institutional buying of 58.12 million [2] Group 3 - The stock with the highest net selling was Tongyu Communication, which had a price decrease of 0.89% and a net institutional selling of 93.20 million [3] - Huangshi Group had a price increase of 1.10% but still faced a net institutional selling of 65.79 million [3] - Suli Co. had a price increase of 10.02% with a net institutional selling of 57.84 million [3]