An ITIN is allotted to an individual and is not per company. As such one ITIN would suffice for all companies.Related ArticlesCan Doola help me get my ITIN?How Do I Apply for an ITIN?How to set up a US LLC + US Bank Account as a non-US resident, remotely from anywhereDo I need a Social Security Number to start a company in the US?Do I need an ITIN to apply for a credit card?