Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities 1 / 6 Announcement Summary Entity name JAMES HARDIE INDUSTRIES PLC Date of this announcement Tuesday December 16, 2025 The +securities the subject of this notification are: Total number of +securities to be issued/transferred ASX +security code Security description Total number of +securities to be issued/transferred Issue date JHXAK RESTRICTED STOCK UNIT 467,137 09/12/2025 Refer to next page for full details of the announcement +Securities issued under an +employee incentive scheme that are subject to a restriction on transfer and are not being quoted on ASX until the restriction ends

Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities 2 / 6 Part 1 - Entity and announcement details 1.1 Name of entity JAMES HARDIE INDUSTRIES PLC We (the entity named above) give notice of the issue, conversion or payment up of the following unquoted +securities. 1.2 Registered number type ARBN Registration number 097829895 1.3 ASX issuer code JHX 1.4 The announcement is 1.5 Date of this announcement 16/12/2025 New announcement

Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities 3 / 6 Part 2 - Issue details 2.1 The +securities the subject of this notification are: 2.2a This notification is given in relation to an issue of +securities in a class which is not quoted on ASX and which: has an existing ASX security code ("existing class") +Securities issued under an +employee incentive scheme that are subject to a restriction on transfer and are not being quoted on ASX until the restriction ends

Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities 4 / 6 Part 3B - number and type of +securities the subject of this notification (existing class) where issue has not previously been notified to ASX in an Appendix 3B Additional +securities in an existing class issued under an +employee incentive scheme ASX +security code and description JHXAK : RESTRICTED STOCK UNIT Date the +securities the subject of this notification were issued 9/12/2025 Will these +securities rank equally in all respects from their issue date with the existing issued +securities in that class Were any of the +securities issued to +key management personnel (KMP) or an +associate? Please provide a URL link for a document lodged with ASX detailing the terms of the +employee incentive scheme or a summary of the terms Refer to 2001 Plan: https://ir.jameshardie.com.au/public/download.jsp?id=5562 Refer to 2006 Plan: https://ir.jameshardie.com.au/public/download.jsp?id=5390 Any other information the entity wishes to provide about the +securities the subject of this notification 456,783 Restricted Stock Units (RSUs) granted under the James Hardie Industries Equity Incentive Plan 2001 (2001 Plan) and 10,354 Performance Based TSR RSUs granted under the James Hardie Industries Incentive Plan 2006 (2006 Plan). https://ir.jameshardie.com.au/public/download.jsp?id=5390 Issue details Number of +securities 467,137 No Yes

Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities 5 / 6 Part 4 - +Securities on issue Following the issue, conversion or payment up of the +securities the subject of this notification, the +securities of the entity will comprise: The figures in parts 4.1 and 4.2 below are automatically generated and may not reflect the entity's current issued capital if other Appendix 2A, Appendix 3G or Appendix 3H forms are currently with ASX for processing. 4.1 Quoted +securities (Total number of each +class of +securities issued and quoted on ASX) ASX +security code and description Total number of +securities on issue JHX : CHESS DEPOSITARY INTERESTS 1:1 430,083,973 4.2 Unquoted +securities (Total number of each +class of +securities issued but not quoted on ASX) ASX +security code and description Total number of +securities on issue JHXAK : RESTRICTED STOCK UNIT 5,509,614 JHXAM : ORDINARY SHARES 149,208,054 JHXAL : OPTION EXPIRING 03-NOV-2027 EX $33.05 269,221

Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities 6 / 6 Part 5 - Other Listing Rule requirements 5.1 Were the +securities issued under an exception in Listing Rule 7.2 and therefore the issue did not need any security holder approval under Listing Rule 7.1? 5.1a Select the number of the applicable exception in Listing Rule 7.2 13 Yes

James Hardie Industries plc 6-K