Sec Form 4 Filing - LAWDAY MARK JAMES @ LUXFER HOLDINGS PLC - 2024-08-20

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person LAWDAY MARK JAMES 2. Issuer Name and Ticker or Trading Symbol LUXFER HOLDINGS PLC [ LXFR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) See Remarks (Last) (First) (Middle) LUXFER HOLDINGS PLC, LUMNS LANE 3. Date of Earliest Transaction (MM/DD/YY) 08/20/2024 (Street) MANCHESTER, X0M27 8LN 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Ordinary Shares 08/20/2024 M 500 A 2,779 D Ordinary Shares 08/20/2024 M 70 A 2,849 D Ordinary Shares 08/20/2024 M 400 A 3,249 D Ordinary Shares 08/20/2024 M 38 A 3,287 D Ordinary Shares 08/20/2024 M 750 A 4,037 D Ordinary Shares 08/20/2024 M 55 A 4,092 D Ordinary Shares 08/20/2024 M 490 A 4,582 D Ordinary Shares 08/20/2024 M 23 A 4,605 D Ordinary Shares 08/20/2024 F 1,195 D $ 10.63 3,410 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Options (Right to Buy) ( 1 ) 08/20/2024 M 500 ( 3 ) 12/13/2025 Ordinary Shares 500 ( 1 ) 0 D Dividend Equivalent Rights ( 2 ) 08/20/2024 M 70 ( 2 ) 12/13/2025 Ordinary Shares 70 ( 2 ) 2 D Stock Options (Right to Buy) ( 1 ) 08/20/2024 M 400 ( 4 ) 03/15/2027 Ordinary Shares 400 ( 1 ) 400 D Dividend Equivalent Rights ( 2 ) 08/20/2024 M 38 ( 2 ) 03/15/2027 Ordinary Shares 38 ( 2 ) 59 D Stock Options (Right to Buy) ( 1 ) 08/20/2024 M 750 ( 5 ) 03/14/2028 Ordinary Shares 750 ( 1 ) 1,500 D Dividend Equivalent Rights ( 2 ) 08/20/2024 M 55 ( 2 ) 03/14/2028 Ordinary Shares 55 ( 2 ) 173 D Stock Options (Right to Buy) ( 1 ) 08/20/2024 M 490 ( 6 ) 03/20/2029 Ordinary Shares 490 ( 1 ) 1,470 D Dividend Equivalent Rights ( 2 ) 08/20/2024 M 23 ( 2 ) 03/20/2029 Ordinary Shares 23 ( 2 ) 110 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other LAWDAY MARK JAMES LUXFER HOLDINGS PLC, LUMNS LANE MANCHESTER, X0M27 8LN See Remarks Signatures /s/ Mark J. Lawday 08/22/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )1 for 1, subject to a nominal payment of $1.00 per Ordinary Share. ( 2 )Represents Dividend Equivalent Rights accrued on Stock Options, which become exercisable proportionately with the Stock Options to which they relate. Each Dividend Equivalent Right is the economic equivalent of one Ordinary Share. Dividend Equivalent Rights convert 1 for 1, subject to a nominal payment of $1.00 per Ordinary Share. ( 3 )Represents the exercise of time-based Stock Options awarded on December 13, 2019. The subject Stock Options vested in four equal annual installments, beginning on December 13, 2020, and were exercisable as of December 13, 2023. The subject Stock Options are fully vested and exercised. ( 4 )Represents the exercise of time-based Stock Options awarded on March 15, 2021. The time-based Stock Options vest in four equal annual installments, beginning on March 15, 2022 and ending on March 15, 2025. The subject Stock Options vested and were exercisable as of March 15, 2024. The remaining Stock Options vest and become exercisable on March 15, 2025. ( 5 )Represents the exercise of time-based Stock Options awarded on March 14, 2022. The Stock Options vest in four equal annual installments, beginning on March 14, 2023 and ending on March 14, 2026. The subject Stock Options vested and were exercisable as of March 14, 2024. The remaining Stock Options vest and become exercisable on March 14, 2025 and March 14, 2026. ( 6 )Represents the exercise of time-based Stock Options awarded on March 20, 2023. The Stock Options vest in four equal annual installments, beginning on March 20, 2024 and ending on March 20, 2027. The subject Stock Options vested and were exercisable as of March 20, 2024. The remaining Stock Options vest in three equal installments on the anniversary of the award date.

Remarks: Vice President and General Manager, Luxfer Gas Cylinders - Europe

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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