EX-21 37 jhx10-k2026ex21.htm EX-21 Document

EXHIBIT 21
LIST OF SIGNIFICANT SUBSIDIARIES
The table below sets forth our subsidiaries as of March 31, 2026 all of which are 100% owned by James Hardie Industries plc, either directly or indirectly, unless noted herein.
Name of CompanyJurisdiction of
Establishment		  Jurisdiction of
Tax Residence
Ajempa Holdings Inc. (Minority Interest of 40%)PhilippinesPhilippines
Aplicaciones Minerales S.A. (28% Minority Interest)SpainSpain
AZEK Building Products LLCUSAUSA
CPG Sub I CorporationUSAUSA
INTEX Millwork Solutions, LLCUSAUSA
James Hardie 117 Pty LtdAustraliaAustralia
James Hardie Acquisition Co., LLCUSAUSA
James Hardie Australia Finance Pty LtdAustraliaAustralia
James Hardie Australia Pty LtdAustraliaAustralia
James Hardie Bâtiment SASFranceFrance
James Hardie Building Products Canada IncCanadaCanada
James Hardie Building Products IncUSAUSA
James Hardie Building Products LimitedUnited KingdomUnited Kingdom
James Hardie Europe B.V.NetherlandsNetherlands
James Hardie Europe Holdings GmbHGermanyGermany
James Hardie Europe GmbHGermanyGermany
James Hardie Fiber Cement Europe GmbHGermanyGermany
James Hardie Netherlands B.V.NetherlandsNetherlands
Fermacell Schraplau GmbHGermanyGermany
James Hardie Spain S.L.U.SpainSpain
James Hardie Holdings LimitedIrelandIreland
James Hardie Insurance LtdGuernseyGuernsey
James Hardie International Finance Designated Activity CompanyIrelandIreland
James Hardie International Group LimitedIrelandIreland
James Hardie International Holdings LimitedIrelandIreland
James Hardie New Zealand LimitedNew ZealandNew Zealand
James Hardie NL1 B.V.NetherlandsNetherlands
James Hardie NL2 B.V.NetherlandsNetherlands
James Hardie NL3 B.V.NetherlandsNetherlands
James Hardie North America, IncUSAUSA
James Hardie NT LimitedIrelandIreland
James Hardie N.V.NetherlandsNetherlands
James Hardie NZ Holdings LimitedNew ZealandNew Zealand
James Hardie Philippines IncPhilippinesPhilippines
James Hardie Research Pty LtdAustraliaAustralia
James Hardie Technology Holdings 1 LimitedIreland  Ireland
James Hardie Technology Holdings 2 LimitedIreland  Ireland
James Hardie Technology LimitedBermuda  Ireland
James Hardie US Holdings LimitedIrelandIreland
JH North America Holdings Inc.USAUSA
JH Research USA, LLCUSAUSA
L.B. Plastics LLCUSAUSA


Name of CompanyJurisdiction of
Establishment		  Jurisdiction of
Tax Residence
NV Technology Holdings, A Limited PartnershipAustraliaAustralia
RCI Holdings Pty LtdAustraliaAustralia
Return Polymers, Inc.USAUSA
Siding Solutions Center LLCUSAUSA
StruXure Outdoor, LLCUSAUSA
Studorp LtdNew ZealandNew Zealand
The AZEK Company IncUSAUSA
The AZEK Group LLCUSAUSA
UltraLox Technology, LLCUSAUSA
Versatex Building Products, LLCUSA  USA
Versatex Holdings, LLCUSA  USA
Victorville Industrial Minerals LLCUSA  USA
WES, LLCUSA  USA