UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 15

CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION

UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934

OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934.

1-42521

Commission File Number

ARTIUS II ACQUISITION INC.

(Exact name of registrant as specified in its charter)

3 Columbus Circle, Suite 1609

New York, NY 10019

(212) 309-7668

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Units, each consisting of one Class A ordinary share, $0.0001 par value, one right to receive one tenth of one Class A ordinary share, and one contingent right

Class A ordinary shares, $0.0001 par value per share

Rights, each right entitling the holder to receive one tenth of one Class A ordinary share

(Title of each class of securities covered by this Form)

None

(Titles of all other classes of securities for which a duty to file reports under section 13(a) or 15(d) remains)

Please place an X in the box(es) to designate the appropriate rule provision(s) relied upon to terminate or suspend the duty to file reports:

Rule 12g-4(a)(1)	☒
Rule 12g-4(a)(2)	☐
Rule 12h-3(b)(1)(i)	☒
Rule 12h-3(b)(1)(ii)	☐
Rule 15d-6	☐
Rule 15d-22(b)	☐

Approximate number of holders of record as of the certification or notice date: None

Pursuant to the requirements of the Securities Exchange Act of 1934, Artius II Acquisition Inc. has caused this certification/notice to be signed on its behalf by the undersigned duly authorized person.

Date:	August 31, 2026	By:	/s/ Boon Sim
		Name:	Boon Sim
		Title:	Chief Executive Officer