券商巨头、大华所，被采取自律监管措施

Core Viewpoint - The Shenzhen Stock Exchange issued regulatory letters to CITIC Securities and Dahua Certified Public Accountants for violations during the IPO process of Huimang Microelectronics, leading to penalties for the involved parties [1][4]. Group 1: Violations Identified - CITIC Securities and Dahua CPA were found to have three main violations during the IPO process of Huimang Microelectronics [4]. - The first violation involved insufficient verification of the issuer's internal controls over distribution revenue, resulting in inaccurate verification opinions [5][8]. - The second violation was related to inadequate scrutiny of the issuer's and its affiliates' fund flows, particularly concerning large abnormal transactions [9]. - The third violation pertained to a lack of attention to the accuracy of the issuer's disclosed production cycle [10]. Group 2: Financial Data and Implications - The prospectus indicated that the issuer's distribution revenue accounted for 91.37%, 94.58%, 95.85%, and 96.78% of its main business income during the reporting periods [6]. - The issuer's production cycle was disclosed as approximately six months, but investigations revealed that some products had significantly longer production cycles, affecting inventory valuation and impairment assessments [11]. Group 3: Regulatory Actions and Recommendations - The Shenzhen Stock Exchange decided to issue written warnings to CITIC Securities and Dahua CPA, emphasizing the need for improved compliance and internal accountability [12]. - CITIC Securities is required to submit a written rectification report within twenty trading days, signed by key responsible personnel [12]. - Both firms are urged to enhance their professional diligence and ensure the accuracy and completeness of their audit and verification processes [12].