Group 1 - The core point of the article is that Weikang Optoelectronics (stock code: 920198) experienced significant trading activity on October 22, 2025, with a turnover rate of 44.37% and a trading volume of 31.1 million shares, amounting to a transaction value of 417 million yuan [1]. Group 2 - The top buying seat was from Dongfang Caifu Securities Co., Ltd., with a purchase amount of 8.63 million yuan [1]. - The top selling seat was from China Galaxy Securities Co., Ltd., with a selling amount of 10.29 million yuan [1].

Core Viewpoint - Micron Optoelectronics (stock code: 920198) experienced a significant price increase of 30.00% on October 21, 2025, leading to its appearance on the trading leaderboard with a total transaction volume of 22.83 million shares and a transaction value of 282 million yuan [1][2]. Trading Activity Summary - The top buying seat was held by China Galaxy Securities Co., Ltd. with a purchase amount of approximately 10.45 million yuan [1][2]. - The top selling seat was held by CITIC Securities Co., Ltd. with a selling amount of approximately 14.72 million yuan [1][2]. - Total buying amounts from other notable securities firms included Dongguan Securities (approximately 8.54 million yuan), Everbright Securities (approximately 6.57 million yuan), and Yintai Securities (approximately 6.53 million yuan) [2].