Wiktionary
intercompany
a. Between, or involving, different company
Usage examples of "intercompany".
In the summer of 1971 he got his hands on an intercompany memo instructing upper management to quietly do whatever possible to discredit Krigler's work with Raleigh 4.
But this is an invoice manifest and has all the correct signs of an interoffice and intercompany document sent to the receiving company for payment.