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Exhibit No. 21
List of Subsidiaries


The subsidiaries of Barnwell Industries, Inc., at September 30, 2025 were:
    
Jurisdiction of
Name of SubsidiaryIncorporation or Organization
Barnwell of Canada, LimitedDelaware
Barnwell Hawaiian Properties, Inc.Delaware
Barnwell Investments LLCDelaware
Barnwell Texas, LLCDelaware
Barnwell Kona CorporationHawaii
Kaupulehu DevelopmentsHawaii
KD Kona 2013 LLLPHawaii
BOK Drilling, LLCHawaii
Octavian Oil, Ltd. Alberta, Canada