6-K

UNITEDSTATES

SECURITIESAND EXCHANGE COMMISSION

Washington,D.C. 20549

FORM6-K

REPORTOF FOREIGN PRIVATE ISSUER

PURSUANTTO RULE 13a-16 OR 15d-16

UNDERTHE SECURITIES EXCHANGE ACT OF 1934

Forthe month of April 2026

CommissionFile Number: 001-43046

GreenCircle Decarbonize Technology Limited

(Registrant’sName)

GreenCircle Decarbonize Technology Limited

Unit1809, Prosperity Place, 6 Shing Yip St.

KwunTong, Kowloon, Hong Kong

(Addressof Principal Executive Offices)

Indicate by check mark whether the registrant files or will file annual reports under cover 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): ☐

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): ☐

Resignationof Chief Financial Officer

Mr. Lai Tai Yan resigned from his position as Chief Financial Officer of Green Circle Decarbonize Technology Limited (the “Company” or “Green Circle”) (NYSE: GCDT), a Cayman Islands holding company, effective as of April 15, 2026.

There was no known disagreement with Mr. Lai as the outgoing Chief Financial Officer on any matter relating to the Company’s operations, policies or practices. The Company is in the process of conducting a search for suitable candidate to serve as Chief Financial Officer of the Company and will announce in due course.

Forward-LookingStatements

Matters discussed in this report may constitute forward-looking statements. Forward-looking statements include statements concerning plans, objectives, goals, strategies, future events or performance, and underlying assumptions and other statements, other than statements of historical facts. The words “believe,” “anticipate,” “intends,” “estimate,” “potential,” “may,” “should,” “expect,” “pending” and similar expressions identify forward-looking statements. The forward-looking statements in this report are based upon various assumptions. Although we believe that these assumptions were reasonable when made, because these assumptions are inherently subject to significant uncertainties and contingencies, which are difficult or impossible to predict and are beyond our control, we cannot assure you that we will achieve or accomplish these expectations.

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.