---
schema_version: "secwatch.filing_event.v1"
accession: "0001683168-26-001381"
form_type: "8-K"
ticker: "QSJC"
cik: "0001753391"
company_name: "TANCHENG GROUP CO., LTD."
filed_at: "2026-03-02T23:59:59+00:00"
generated_at: "2026-05-15T22:41:52.464077+00:00"
event_type: "other_material"
sentiment: "negative"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Tancheng Group dismisses auditor Onestop Assurance, appoints Guangdong Prouden

## Summary
- Dismissed Onestop Assurance PAC effective Feb 27, 2026; its FY2024 and FY2023 reports included a going-concern emphasis.
- No disagreements with Onestop; only previously disclosed material weaknesses in internal controls were noted.
- Appointed Guangdong Prouden CPAs GP as new independent auditor for fiscal year ending Dec 31, 2025; no prior consultation.
- Material weaknesses include lack of audit committee, inadequate internal control structure, and poor IT controls.

## SEC filing metadata
- accession: 0001683168-26-001381
- form_type: 8-K
- ticker: QSJC
- cik: 0001753391
- company_name: TANCHENG GROUP CO., LTD.
- filed_at: 2026-03-02T23:59:59+00:00
- event_type: other_material
- sentiment: negative
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 4.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1753391/000168316826001381/0001683168-26-001381-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1753391/000168316826001381/tancheng_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001683168-26-001381
- JSON: https://secwatch.observer/filing/0001683168-26-001381.json
- Plain text: https://secwatch.observer/filing/0001683168-26-001381.txt

## Source-grounded claims
- claim_id: ba771279fcc964b36489b5783dafeec7c60f217a
  claim: TANCHENG GROUP CO., LTD. engaged Guangdong Prouden CPAs GP as its auditor.
  evidence_excerpt: 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.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1753391/000168316826001381/0001683168-26-001381-index.htm
- claim_id: e2ed9f2ba78691abd82185da3f4ac068669ed821
  claim: TANCHENG GROUP CO., LTD. dismissed Onestop Assurance PAC as its auditor.
  evidence_excerpt: 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.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1753391/000168316826001381/0001683168-26-001381-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.