noun which may take the genitive case particle 'no'
business-to-business; inter-enterprise; B2B
Used as a no-adjective to describe transactions, relationships, or activities between companies.
企業間取引は、B2Bとも呼ばれます。
Business-to-business transactions are also called B2B.
企業間の連携が重要だ。
Cooperation between companies is important.
企業間取引 is the full compound noun for 'business-to-business transaction', while 企業間 is the shorter no-adjective form.
Compound of 企業 (enterprise) + 間 (between).