EXHIBIT 31.1
CERTIFICATION OF CHIEF EXECUTIVE OFFICER
PURSUANT TO RULE 13A-14(A) UNDER THE SECURITIES EXCHANGE ACT OF 1934,
AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002
I, Boon Sim, certify that:
1. I have reviewed this quarterly report on Form
10-Q of Artius II Acquisition Inc.;
2. Based on my knowledge, this report does not
contain any untrue statement of a material fact or omit to state a material
fact necessary to make the statements made, in light of the circumstances under
which such statements were made, not misleading with respect to the period
covered by this report;
3. Based on my knowledge, the financial statements,
and other financial information included in this report, fairly present in all
material respects the financial condition, results of operations and cash flows
of the registrant as of, and for, the periods presented in this report;
4. The registrant’s other certifying officer(s) and
I are responsible for establishing and maintaining disclosure controls and
procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the
registrant and internal control over financial reporting (as defined in
Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:
a) Designed such disclosure controls and
procedures, or caused such disclosure controls and procedures to be designed
under my supervision, to ensure that material information relating to the
registrant, is made known to us by others within those entities, particularly
during the period in which this report is being prepared; and
b) (Paragraph omitted pursuant to Exchange Act
Rules 13a-14(a) and 15d-15(a));
c) Evaluated the effectiveness of the registrant’s
disclosure controls and procedures and presented in this report my conclusions
about the effectiveness of the disclosure controls and procedures, as of the
end of the period covered by this report based on such evaluation; and
d) Disclosed in this report any change in the
registrant’s internal control over financial reporting that occurred during the
registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter
in the case of an annual report) that has materially affected, or is reasonably
likely to materially affect, the registrant’s internal control over financial
reporting; and
5. The registrant’s other certifying officer(s) and
I have disclosed, based on our most recent evaluation of internal control over
financial reporting, to the registrant’s auditors and the audit committee of
the registrant’s board of directors (or persons performing the equivalent
functions):
a) All significant deficiencies and material
weaknesses in the design or operation of internal control over financial
reporting which are reasonably likely to adversely affect the registrant’s
ability to record, process, summarize and report financial information; and
b) Any fraud, whether or not material, that
involves management or other employees who have a significant role in the
registrant’s internal control over financial reporting.
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Date: May 6, 2026
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/s/ Boon Sim
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Boon Sim
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Chief Executive Officer and Chairman
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(Principal Executive Officer)
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