Sitong Co., Ltd.: The company's stock will be subject to delisting risk warning from April 30, 2025.

Announcement of Four Communication Corporation: If the total profit, net profit, or net profit after deducting non-recurring gains and losses audited for the year 2024 is negative, and the operating income after deducting non-operating business income and income without commercial substance and is less than 300 million RMB, the company's stock will be suspended for 1 day on April 29, 2025, and will implement delisting risk warning from April 30, 2025. The stock abbreviation will be changed to "*ST Four Communication", and the daily price limit for the stock will be 5%. The company plans to actively explore the market, increase development in the refining business of zirconium and titanium ore products, strengthen financial management, enhance investor confidence, promote cost reduction and efficiency improvement, and take other measures to strive for the cancellation of the delisting risk warning.