Reminder Regarding the Upcoming Suspension of Trading and Conversion of Yong22 Convertible Bond, Trading Risks of *ST Yanshi, *ST Jinglun, *ST Chunday, and Delisting of *ST Aowei

Dear Investors:

Yong 22 Convertible Bonds (Bond Code: 113653) have triggered the early redemption condition. The last trading day is April 16, 2026, and the last conversion date is April 21, 2026. After the market close on April 21, 2026, any remaining convertible bonds that have not been converted will cease to be convertible and will be forcibly redeemed. Once redemption is completed, the bonds will be delisted from the Shanghai Stock Exchange.

As of March 20, the closing price of Yongguan New Materials (Stock Code: 603681) was 17.17 yuan per share, the conversion price of Yong 22 Convertible Bonds was 16.5 yuan per share; the closing price of the bonds was 107.021 yuan per bond, and the redemption price was 101.1014 yuan per bond. If you do not trade or do not apply for conversion before the market close on April 16, 2026, or before the market close on April 21, 2026, your bonds will stop trading or conversion will be halted, and they will be forcibly redeemed. You may face losses. Please read the relevant announcements carefully and pay attention to trading or applying for conversion within the specified period.

“*ST Rock” (600696) has recently issued multiple risk warning announcements regarding the possible delisting of the company’s stock. The announcement clearly states that the stock has been under delisting risk warning since April 23, 2025. The company expects its operating income for 2025 to be less than 300 million yuan, and both pre- and post-deduction net profits are negative. As of now, the annual auditors have not obtained sufficient and appropriate audit evidence to confirm that the issues involving the 2024 audit report with non-unqualified opinions have been resolved. If sufficient and appropriate audit evidence cannot be obtained later, it is expected that the company’s 2025 financial statements will be issued with a non-unqualified opinion. According to the Shanghai Stock Exchange’s Listing Rules, the company’s stock is expected to be delisted due to financial delisting conditions. Investors should be aware of the investment risks.

“*ST Jinglun” (600355) has recently issued a risk warning announcement regarding the possible delisting of the company’s stock. The announcement states that the stock has been under delisting risk warning since April 29, 2025. The company expects its audited net profit for 2025 to be negative, and its operating income after deducting non-core business income and non-substantive income to be less than 300 million yuan. After the annual report is disclosed, the company’s stock may face delisting risks according to Article 9.3.7 of the Shanghai Stock Exchange’s Listing Rules. Investors should be cautious of investment risks.

“*ST Spring” (600381) has experienced significant stock price fluctuations recently, and the company has issued multiple risk warning announcements regarding trading risks. The announcement states that the stock has been under delisting risk warning since April 30, 2025. The relevant audit work has not yet been completed, and there is a possibility that some business revenues may not be recognized or may be deducted. If the audited financial data for 2025 do not meet the conditions for removing the delisting risk warning under the Shanghai Stock Exchange’s rules, the stock may be delisted. If pre-paid investment funds cannot be recovered, the auditors will issue a disclaimer of opinion, and the stock will be delisted. Investors are advised to make rational decisions and invest cautiously.

The Shanghai Stock Exchange will strictly identify abnormal trading behaviors of the above stocks and may take disciplinary measures such as placing them on key monitoring lists, suspending investor account trading, or restricting investor account trading as appropriate. Nanjing Securities reminds you to pay special attention to the trading risks of these stocks, stay updated with company announcements, and invest rationally and prudently.

*ST Aowei (Stock Code: 002231) was delisted by the Shenzhen Stock Exchange on March 20, 2026. Stocks subject to mandatory delisting do not enter the delisting restructuring period and will be delisted within fifteen trading days after the delisting decision.

Nanjing Securities reminds you to pay timely attention to company announcements. For specific details, please visit the stock exchange website or Juchao Information Network.

Nanjing Securities Co., Ltd.

March 20, 2026