Alpine 4 (ALPP) S-1 2023 Q2 IPO registration

Exhibit 21

SUBSIDIARIES OF THE COMPANY

•A4 Corporate Services, LLC – Delaware limited liability company

•ALTIA, LLC – Arizona limited liability company

•Quality Circuit Assembly, Inc. – California corporation

•Morris Sheet Metal, Corp. – Indiana corporation

•JTD Spiral, Inc. – Indiana corporation

•Excel Construction Services, LLC – Idaho limited liability company

•SPECTRUMebos, Inc. – Delaware corporation

•Vayu Aerospace Corp. – Delaware corporation

•Thermal Dynamics International, Inc. – Florida corporation

•Alternative Laboratories, LLC. – Delaware limited liability company

•Identified Technologies, Corp. – Delaware corporation

•ElecJet Corp. – Delaware corporation

•DTI Services LLC (doing business as RCA Commercial Electronics ("RCA")) – Indiana limited liability company

•Global Autonomous Corp. ("GAC") – Delaware corporation