intercorporate

adjective

in·​ter·​cor·​po·​rate ˌin-tər-ˈkȯr-p(ə-)rət 

variants or inter-corporate

: existing between, involving, or belonging to two or more corporations

intercorporate loans/investments

intercorporate relationships

the intercorporate trading of supposedly confidential Social Security numbers has mushroomed.

—William Safire

Word History

First Known Use

1868, in the meaning defined above