Tancheng Group Co., Ltd.: auditor change, Onestop Assurance PAC to Guangdong Prouden CPAs GP

On February 27, 2026, the Board of Directors of Tancheng Group Co., Ltd. (the “Company”) approved the dismissal of Onestop Assurance PAC (“Onestop Assurance”) as the Company’s independent registered public accounting firm, effective immediately.

there were no disagreements with Onestop Assurance (within the meaning of Item 304(a)(1)(iv) of Regulation S-K (“Regulation S-K”) of the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”)) on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure

On February 27, 2026, the Board of Directors of the Company approved the appointment of Guangdong Prouden CPAs GP (“Guangdong Prouden”) as the Company’s new independent registered public accounting firm for the fiscal year ending December 31, 2025.