# EDGAR Filing Document

**Accession Number:** 0001753391
**File Stem:** 0001683168-26-001381
**Filing Date:** 2026-3
**Character Count:** 10456
**Document Hash:** d6059a07161a9b1f11841de73d8560af
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001683168-26-001381.hdr.sgml**: 20260302

**ACCESSION NUMBER**: 0001683168-26-001381

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 14

**CONFORMED PERIOD OF REPORT**: 20260227

**ITEM INFORMATION**: Changes in Registrant's Certifying Accountant

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260302

**DATE AS OF CHANGE**: 20260302

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** TANCHENG GROUP CO., LTD.
- **CENTRAL INDEX KEY:** 0001753391
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-COMPUTER PROGRAMMING, DATA PROCESSING, ETC. [7370]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 384086827
- **STATE OF INCORPORATION:** NV
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-56590
- **FILM NUMBER:** 26703362

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 7TH FLOOR, JINCHENG INTL.,  JIUJINCI RD.
- **STREET 2:** WANBAILIN DISTRICT
- **CITY:** TAIYUAN CITY
- **NON US STATE TERRITORY:** SHANXI PROVINCE, P.R.
- **PROVINCE COUNTRY:** F4
- **BUSINESS PHONE:** 8613910972765

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 7TH FLOOR, JINCHENG INTL.,  JIUJINCI RD.
- **STREET 2:** WANBAILIN DISTRICT
- **CITY:** TAIYUAN CITY
- **NON US STATE TERRITORY:** SHANXI PROVINCE, P.R.
- **PROVINCE COUNTRY:** F4

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BIGEON CORP.
- **DATE OF NAME CHANGE:** 20180918

?xml version='1.0' encoding='ASCII'? TANCHENG GROUP CO., LTD.8-K

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION**

**WASHINGTON, D.C. 20549**

**FORM 8-K**

**CURRENT REPORT**

**Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934**

Date of Report (Date of Earliest Event Reported): **February 27, 2026**

**<u>TANCHENG GROUP CO., LTD.</u>**

(Exact name of registrant as specified in its charter)

---

| | | |
|:---|:---|:---|
| **Nevada** | **333-228803** | **38-4086827** |
| (State or other jurisdiction of<br> incorporation) | (Commission<br> File Number) | (IRS Employer<br> Identification No.) |

---

**7th Floor, Jincheng International, Jiujinci Road,** **Wanbailin District**

**<u>Taiyuan City, Shanxi Province, P.R. China 030500</u>**

(Address of principal executive offices, zip code)

**<u>(+86) 139-1097-2765</u>**

(Registrant's telephone number, including area code)

**<u>N/A</u>**

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

◻ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

◻ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

◻ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

◻ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

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| | | |
|:---|:---|:---|
| **Title of each class** | **Trading Symbol(s)** | **Name of each exchange on which registered** |
| None | N/A | N/A |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

**Item 4.01. Change in Registrant's Certifying Accountant.**

**(a) Dismissal of Former Independent Registered Public Accounting Firm**

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.

Onestop Assurance's reports on the Company's financial statements as of and for the years ended December 31, 2024 and 2023 contained no adverse opinion or disclaimer of opinion, and were not qualified or modified as to uncertainty, audit scope, or accounting principles, except that the audit reports of Onestop Assurance on the financial statements of the Company as of and for the years ended December 31, 2024 and 2023 included an Emphasis of Matter paragraph and an explanatory paragraph that described factors that raised substantial doubt about the Company's ability to continue as a going concern.

During the fiscal years ended December 31, 2024 and 2023, and in the subsequent interim period through February 27, 2026, (i) 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 that if not resolved to Onestop Assurance's satisfaction, would have caused Onestop Assurance to make reference to the subject matter of the disagreements in connection with its reports; and (ii) there were no reportable events (as defined by Item 304(a)(1)(v) of Regulation S-K), except for the material weaknesses in the Company's internal control over financial reporting previously disclosed in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2024. As previously disclosed, the following control deficiencies were identified that represent material weaknesses as of December 31, 2024: (i) the Company does not have an adequate internal control structure or adequate oversight over financial reporting. The Company had only a sole director and executive officer before October 12, 2023. Further, the Company currently has no Audit Committee. While not being legally obligated to have an audit committee, it is the management's view that such a committee, including a financial expert member, is an utmost important entity level control over the Company's financial statement. Currently the Board of Directors acts in the capacity of the Audit Committee, and does not include a member that is considered to be independent of management to provide the necessary oversight over management's activities; (ii) the Company lacks appropriate information technology controls. As of December 31, 2024, the Company retained copies of all financial data and material agreements; however, there is no formal procedure or evidence of normal backup of the Company's data or off-site storage of data in the event of theft, misplacement, or loss due to unmitigated factors.

In accordance with Item 304(a)(3) of Regulation S-K, on February 27, 2026, the Company provided Onestop Assurance with a copy of the foregoing disclosures and requested that Onestop Assurance provide a letter addressed to the SEC stating whether it agrees with such disclosures. A copy of Onestop Assurance's letter dated February 28, 2026 is filed as Exhibit 16.1 to this Current Report on Form 8-K.

**(b) Appointment of New Independent Registered Public Accounting Firm**

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. During the Company's two most recent fiscal years ended December 31, 2024 and 2023, and the subsequent interim period through February 27, 2026, neither the Company nor anyone acting on its behalf consulted with Guangdong Prouden with respect to either (i) the application of accounting principles to a specified transaction, either completed or proposed, or the type of audit opinion that might be rendered on the consolidated financial statements of the Company, and no written report or oral advice was provided by Guangdong Prouden to the Company that Guangdong Prouden concluded was an important factor considered by the Company in reaching a decision as to the accounting, auditing or financial reporting issue, or (ii) any matter that was the subject of either a disagreement (as defined in Item 304(a)(1)(iv) of Regulation S-K) or a reportable event (as described in Item 304(a)(1)(v) of Regulation S-K).

**Item 9.01. Financial Statements and Exhibits.**

**(d) Exhibits**

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| | |
|:---|:---|
| **Exhibit No.** | **Description** |
| 16.1 | [Letter from Onestop Assurance PAC, dated February 28, 2026](tancheng_ex1601.htm) |
| 104 | Cover Page Interactive Data File (the cover page XBRL tags are embedded within the inline XBRL document) |

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**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | | |
|:---|:---|:---|
|  | **Tancheng Group Co., Ltd.** | **Tancheng Group Co., Ltd.** |
| Dated: February 28, 2026 | By: | /s/ Yu Yang |
|  | Name: | Yu Yang |
|  | Title: | Chief Executive Officer |

---

## Exhibit 16.1

**Exhibit 16.1**

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| | |
|:---|:---|
| ![](onestop_logo.jpg) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Onestop Assurance PAC**<br> **10 Anson Road**<br> **#21-14 International Plaza**<br> **Singapore 079903** <br> **Tel: 9644 9531**<br> **Email:audit@onestop-audit.com**<br> **Website: www.onestop-audit.com** |

---

February 28, 2026

United States Securities and Exchange Commission<br> Office of the Chief Accountant<br> 100 F Street, N.E.<br> Washington, D.C. 20549

Re: Tancheng Group Co., Ltd.

Ladies and Gentlemen:

We have read the statements under item 4.01 in the Form 8-K dated February 28, 2026, of Tancheng Group Co., Ltd. (the "Company") to be filed with the Securities and Exchange Commission and we agree with such statements therein as related to our firm. We have no basis to, and therefore, do not agree or disagree with the other statements made by the Company in Form 8-K.

Sincerely Yours,

/s/ OneStop Assurance PAC

Singapore