瑞可达龙虎榜：营业部净买入5505.22万元

Group 1 - The core point of the article is that Ruikeda (688800) experienced a significant increase in its stock price, closing at 72.98 yuan with a rise of 15.09% on January 20 [1] - The stock had a trading volume with a turnover rate of 11.63% and a price fluctuation of 11.76%, resulting in a total transaction amount of 1.306 billion yuan [1] - Ruikeda was the only stock listed on the Sci-Tech Innovation Board that day due to its price increase reaching 15% [2] Group 2 - The top five trading departments accounted for a total transaction amount of 356 million yuan, with a buying transaction amount of 205 million yuan and a selling transaction amount of 150 million yuan, resulting in a net buying of 55.052 million yuan [2]