CDT Environmental (NASDAQ: CDTG) files Form 6-K with H1 2025 update

Rhea-AI Filing Summary

CDT Environmental Technology Investment Holdings Limited furnished a Form 6-K as a foreign private issuer, mainly to provide investors with three press releases as exhibits. The company attached releases dated June 20, 2025 and November 20, 2025, and an additional release dated December 23, 2025. The December 23, 2025 press release announces the company’s unaudited interim financial results for the first half of 2025, which are incorporated by reference through this filing.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of December, 2025

Commission File Number 001-42007

CDT Environmental Technology Investment Holdings Limited

(Translation of registrant’s name into English)

C1, 4th Floor, Building 1, Financial Base, No. 8 Kefa Road

Nanshan District, Shenzhen, China 518057

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F. Form 20-F ☒ Form 40-F ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ☐

Note: Regulation S-T Rule 101(b)(1) only permits the submission in paper of a Form 6-K if submitted solely to provide an attached annual report to security holders.

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ☐

Note: Regulation S-T Rule 101(b)(7) only permits the submission in paper of a Form 6-K if submitted to furnish a report or other document that the registrant foreign private issuer must furnish and make public under the laws of the jurisdiction in which the registrant is incorporated, domiciled or legally organized (the registrant’s “home country”), or under the rules of the home country exchange on which the registrant’s securities are traded, as long as the report or other document is not a press release, is not required to be and has not been distributed to the registrant’s security holders, and, if discussing a material event, has already been the subject of a Form 6-K submission or other Commission filing on EDGAR

On June 20, 2025 and November 20, 2025, the Company issued press releases, copies of which are attached hereto as Exhibits 99.1 and 99.2, respectively, and are incorporated herein by reference.

On December 23, 2025, the Company issued a press release announcing its unaudited interim financial results for the first half of 2025, a copy of which is attached hereto as Exhibit 99.3 and is incorporated herein by reference.

Exhibit No.	Description of Exhibit
99.1	Press Release, dated June 20, 2025
99.2	Press Release, dated November 20, 2025
99.3	Press Release, dated December 23, 2025

 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, thereunto duly authorized.

Date: December 23, 2025

	CDT Environmental Technology Investment Holdings Limited
	By:	/s/ Yunwu Li
		Name: Yunwu Li
		Title: Chief Executive Officer and Chairman of the Board of Directors

FAQ

What does CDT Environmental Technology Investment Holdings (CDTG) report in this Form 6-K?

The company furnishes a Form 6-K to provide three press releases as exhibits. These include announcements from June 20, 2025, November 20, 2025, and December 23, 2025, all incorporated by reference.

Does CDTG disclose financial results in this Form 6-K?

The filing states that a press release dated December 23, 2025 announces the company’s unaudited interim financial results for the first half of 2025, and that this release is attached as Exhibit 99.3.

What exhibits are included with CDTG’s December 2025 Form 6-K?

The exhibits listed are: 99.1 – Press Release dated June 20, 2025; 99.2 – Press Release dated November 20, 2025; and 99.3 – Press Release dated December 23, 2025.

Who signed the Form 6-K for CDT Environmental Technology Investment Holdings (CDTG)?

The report was signed on behalf of the company by Yunwu Li, who is identified as Chief Executive Officer and Chairman of the Board of Directors, dated December 23, 2025.