Core Viewpoint - The article discusses a case of "mouse trading" involving a former fund manager, Li Dan, who was penalized for engaging in transactions that mirrored the fund's undisclosed information, resulting in significant losses for the fund she managed [1][2]. Group 1: Case Details - Li Dan, a former fund manager at Guoshou Anbao Fund, was fined 600,000 yuan for engaging in synchronized trading activities from March 22, 2022, to February 8, 2024, involving a total of 33.12 million yuan [1][2]. - During the investigation, it was revealed that 41 stocks were involved in the synchronized trading, accounting for 74.55% of the total trades, with the amount representing 72.77% of the fund's trading activities [2]. - The fund managed by Li Dan, Guoshou Anbao Core Industry, experienced a cumulative loss of 7.77% during her 8-year tenure, ranking 716 out of 789 in its category [3][4]. Group 2: Fund Performance - The Guoshou Anbao Core Industry fund saw its size halved from 893 million yuan at the end of 2019 to 427 million yuan by the first quarter of 2024, largely due to poor performance [4]. - Other funds managed by Li Dan also showed disappointing returns, with the Guoshou Anbao Consumption New Blue Ocean fund achieving an annualized return of only 1.62% from 2018 to 2024, ranking 1194 out of 1519 [4]. Group 3: Regulatory Environment - The China Securities Regulatory Commission (CSRC) has adopted a zero-tolerance approach towards illegal activities in the fund industry, with multiple cases of misconduct being prosecuted [5]. - Recent regulatory measures emphasize the importance of compliance management and the binding of fund managers' interests with those of investors, particularly targeting behaviors like "mouse trading" [5].

Core Viewpoint - The article discusses a case of insider trading known as "mouse warehouse" involving a former fund manager, Li Dan, who was fined for trading based on undisclosed information related to a fund he managed [2][4]. Group 1: Case Details - Li Dan controlled another person's securities account to conduct trading activities related to undisclosed information from March 22, 2022, to February 8, 2024, resulting in a fine of 600,000 yuan [2][3]. - During the mentioned period, Li Dan's trading decisions led to the purchase of 41 stocks, which accounted for 74.55% of the total trades, with a total investment of approximately 33.12 million yuan, representing 72.77% of the total trading amount, ultimately resulting in losses [3][4]. - Li Dan's actions violated the Fund Law, leading to the penalty imposed by the Tianjin Securities Regulatory Bureau [4]. Group 2: Background of Li Dan - Li Dan joined Guoshou Anbao Fund in December 2013 and served as the fund manager for the Guoshou Anbao Core Industry Fund from February 3, 2016, to February 8, 2024 [2][4]. - Over his eight-year tenure managing the Guoshou Anbao Core Industry Fund, Li Dan recorded a return of -7.77%, placing it in the bottom 10% of similar products [4]. - Li Dan managed a total of seven public funds, with one fund reaching a management scale exceeding 2 billion yuan in Q4 2020, but he recorded losses in multiple funds during his management [4]. Group 3: Industry Context - The article highlights that "mouse warehouse" incidents have been recurrent in the industry, with several fund companies, including Jiashi Fund and Puyin Ansheng Fund, facing similar issues [5][6]. - The regulatory environment has tightened, with increased penalties for such violations, indicating a growing awareness and response to these unethical practices [7]. - Industry insiders suggest that the allure of high returns drives some professionals to engage in illegal trading, while existing internal controls and monitoring mechanisms are often inadequate [7].