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HMH Holding (HMHW) S-1IPO registration

Filed: 12 Aug 24, 5:10pm

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9 Sep 24 S-1/A IPO registration (amended)
23 Aug 24 S-1/A IPO registration (amended)
12 Aug 24 S-1 IPO registration

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Exhibit 21.1

List of Subsidiaries of HMH Holding Inc.


Name		State or Other Jurisdiction of Incorporation or Organization
Bronco Manufacturing, LLC		Oklahoma
Drillform Drilling Equipment Inc.		Delaware
Drillform Oilfield Equipment Services LLC		United Arab Emirates
Drillform Technical Services Ltd.		Canada
Electrical Subsea & Drilling AS		Norway
HMH Drilling Asia Pte. Ltd.		Singapore
HMH Drilling Engineering Services of India Private Limited		India
HMH Holding B.V.		Netherlands
HMH Holding (Netherlands) B.V.		Netherlands
HMH Turkey Petrol ve Doğal Gaz Ekipmanları ve Hizmetleri Anonim Şirketi		Turkey
Hydril PCB Canada Inc		Canada
Hydril PCB Limited		England
Hydril Pressure Controlling Arabia Limited		Saudi Arabia
Hydril Pressure Control (Senegal) SASU		Senegal
Hydril Pressure Control S. de R.L. de C.V.		Mexico
Hydril USA Distribution LLC		Delaware
MHWirth AS		Norway
MHWirth do Brasil Equipamentos Ltda		Brazil
MHWirth Canada Inc.		Canada
MHWirth Chile SpA		Chile
MHWirth FZE		United Arab Emirates
MHWirth Gas & Oil-Field Equipment & Services L.L.C.		United Arab Emirates
MHWirth GmbH		Germany
MHWirth HoldCo AS		Norway
MHWirth India Private Limited		India
MHWirth LLC		Delaware
MHWirth Offshore Petroleum Engineering (Shanghai) Co., Ltd		China
MHWirth Pty Ltd		Australia
MHWirth (Singapore) Pte Ltd		Singapore
MHWirth UK Limited		England
Roughneck Holding Inc.		Canada

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