Tancheng Group Co., Ltd. Announces Change in Independent Auditor and Discloses Internal Control Weaknesses

Date of Report: February 27, 2026

Company: Tancheng Group Co., Ltd. (formerly Bigeon Corp.)

Central Index Key (CIK): 0001753391

SEC File Number: 333-228803

Business Address: 7th Floor, Jincheng International, Jiujinci Rd., Wanbailin District, Taiyuan City, Shanxi Province, P.R. China

Key Points and Developments

• Change in Independent Registered Public Accounting Firm:
  • On February 27, 2026, the Board of Directors of Tancheng Group Co., Ltd. dismissed its previous independent auditor, Onestop Assurance PAC, and appointed Guangdong Prouden CPAs GP as its new independent registered public accounting firm for the fiscal year ending December 31, 2025.
  • This change occurred after the Company provided Onestop Assurance PAC with its disclosures and requested a response letter, which Onestop provided on February 28, 2026. Onestop Assurance agreed with the statements related to their firm and did not express disagreement with other disclosures.
• Internal Control Weaknesses Disclosed:
  • The company reported significant material weaknesses in its internal control over financial reporting as of December 31, 2024, which were previously disclosed in its Annual Report on Form 10-K.
  • The key weaknesses include:
    • Lack of Internal Control Structure and Oversight: The company had only a sole director and executive officer before October 12, 2023. It currently has no Audit Committee, which management views as a critical oversight function. The Board of Directors currently acts as the Audit Committee but lacks an independent member, reducing oversight over management activities.
    • Inadequate Information Technology Controls: Although the company retains copies of all financial data and material agreements, there are no formal backup procedures or off-site data storage, exposing the company to risk of data loss due to theft, misplacement, or other unmitigated factors.
• No Reportable Disagreements:
  • There were no disagreements between Tancheng Group and Onestop Assurance on matters of accounting principles or practices, financial statement disclosure, or auditing scope or procedures that would have required disclosure.
  • No reportable events were present, except for the aforementioned internal control weaknesses.
• No Securities Registered Under Section 12(b):
  • The company has no securities registered under Section 12(b) of the Exchange Act, and no trading symbols or exchanges are currently listed.
• Emerging Growth Company Status:
  • Tancheng Group Co., Ltd. indicated that it is not an emerging growth company under Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Exchange Act of 1934.

Implications and Price-Sensitive Information for Shareholders

• Auditor Change: The change of auditor can be a significant event, especially when associated with previously disclosed weaknesses in internal controls. Investors may interpret the appointment of a new audit firm as an attempt to improve corporate governance, but it may also raise concerns about the reliability of previous financial reporting.
• Material Weaknesses in Internal Controls: The disclosed weaknesses—lack of an audit committee, insufficient oversight, and poor IT controls—may affect investor confidence in the company’s ability to accurately report financial results and safeguard assets. These deficiencies could expose the company to regulatory scrutiny or financial misstatements, which may be price-sensitive information.
• No Audit Committee or Independent Directors: The absence of an independent audit committee member means there is less independent oversight of management, which is a red flag for institutional investors and may affect perceptions of governance risk.
• No Exchange Listing: The company’s securities are not listed or traded on any exchange, which limits liquidity for shareholders and may affect the company’s ability to raise capital or attract new investors.

Exhibits

• Exhibit 16.1: Letter from Onestop Assurance PAC, dated February 28, 2026, confirming agreement with the company’s disclosures regarding the change in auditor.
• Exhibit 104: Cover Page Interactive Data File (inline XBRL document tags embedded).

Conclusion

The change in Tancheng Group Co., Ltd.’s independent auditor, coupled with the disclosure of ongoing material weaknesses in internal controls, is an important development for shareholders. These issues may have a material impact on the company’s financial reporting integrity and future compliance. Investors should monitor further communications from the company regarding remediation of control deficiencies and any updates on corporate governance improvements.

Disclaimer: This article is provided for informational purposes only and does not constitute investment advice, an offer, or solicitation to buy or sell any securities. Investors should conduct their own due diligence and consult with financial professionals before making investment decisions. The information is based on filings and disclosures as of the date of the report and may be subject to change without notice.

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