LUXFER HOLDINGS PLC

31.1 Certification Required by Rule 13a-14(a) or 15d-14(a) under the Securities Exchange Act of 1934-Andrew Butcher

31.2 Certification Required by Rule 13a-14(a) or 15d-14(a) under the Securities Exchange Act of 1934-Stephen Webster

32.1 Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (Subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code)-Andrew Butcher

32.2 Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (Subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code)-Stephen Webster

101 The financial statements from the Company’s Interim Report on Form 10-Q for the quarter ended September 28, 2025, formatted in inline XRBL: (i) Condensed Consolidated Statements of Income; (ii) Condensed Consolidated Statements of Comprehensive Income; (iii) Condensed Consolidated Balance Sheets; (iv) Condensed Consolidated Statements of Cash Flows; (v) Condensed Consolidated Statements of Changes in Equity; and (vi) Notes to Condensed Consolidated Financial Statements, tagged as blocks of text and including detailed tags. The instance document does not appear in the Interactive Data File because its XRBL tags are embedded within the Inline XRBL document.

104 Cover Page Interactive Data File (formatted as inline XRBL and contained in Exhibit 101).

SIGNATURES

Pursuant to the requirements of Section 13 or 15 (d) 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.

Luxfer Holdings plc

(Registrant)

/s/Andrew Butcher

Andrew Butcher

Chief Executive Officer

(Duly Authorized Officer)