三家A股公司同日公告：被证监会立案

Group 1: Core Insights - Three companies, Zhenlei Technology, ST Changyuan, and Daye Intelligent, have been investigated by the China Securities Regulatory Commission (CSRC) for suspected violations of information disclosure regulations [1][2][3][4]. Group 2: Company Summaries - Zhenlei Technology: The company received a notice from the CSRC regarding the investigation. It specializes in chip and microsystem research, with applications in various fields including data links and wireless communication. The stock price is 138 yuan, with a market capitalization of 29.539 billion yuan, having increased over 110% in December and over 290% year-to-date [2]. - ST Changyuan: This company also received a notice from the CSRC for suspected information disclosure violations. It focuses on industrial and power system intelligence and has over 8,000 employees with multiple subsidiaries globally. The stock price is 3.8 yuan, with a market capitalization of 5.011 billion yuan [3]. - Daye Intelligent: Similar to the other two, Daye Intelligent is under investigation by the CSRC. The company specializes in energy and electrical equipment and services, with a stock price of 8 yuan and a market capitalization of 2.535 billion yuan. It was established in December 2011 and listed on the Shenzhen Stock Exchange in July 2017 [4].