Core Viewpoint - The "Apple concept" sector, particularly Chaoyang Technology, has experienced significant volatility due to changes in US-China tariff policies and promotional pricing strategies ahead of the "618" shopping festival, leading to increased investor scrutiny [1][6]. Company Summary - Chaoyang Technology reported a total revenue of 1.734 billion yuan in 2024, a year-on-year increase of 21.24%, while net profit decreased by 3.31% to 113 million yuan [2]. - The company's revenue breakdown shows that earphone products generated 1.22 billion yuan (70.36% of main business revenue), sound products contributed 236 million yuan (13.62%), and precision components accounted for 265 million yuan (15.27%) [2]. - Major clients include well-known brands such as A client, Samsung, and Xiaomi, with sales to the largest customer reaching 703 million yuan, representing 40.53% of total sales [2]. Institutional Investor Changes - There was a notable reduction in institutional investor holdings in Chaoyang Technology from the end of 2024 to the first quarter of 2025, with only four institutions remaining compared to thirteen previously [4][5]. - The largest institutional shareholder, Morgan Stanley, reduced its holdings from 357,200 shares to 225,200 shares, while other funds also decreased their stakes significantly [5]. Sector Performance - The "Apple concept" sector saw a rise prior to the recent downturn, influenced by tariff changes and promotional activities in the consumer market [6]. - Companies like Dongni Electronics and Yanmian Technology also faced challenges, with Dongni Electronics reporting a revenue of 1.981 billion yuan in 2024, a 7.86% increase, but a net profit of only 11.52 million yuan [8]. - Yanmian Technology's revenue heavily relies on the Apple supply chain, with 44.19% of its sales coming from its largest customer [9]. R&D and Future Outlook - Si Lin Jie, another player in the sector, achieved a revenue of 184.51 million yuan in 2024, a 10.09% increase, with a net profit growth of 69.99% [10]. - Despite the growth, Si Lin Jie reported a decrease in R&D investment from 52.08 million yuan to 49.24 million yuan, indicating potential concerns about future innovation capabilities [11].