As simple as it might sound - the use of Company's, Companies and Companies' are still mistaken by many people due to sheer ignorance of the minor difference between them.
Where to use - COMPANY?
The "Company" is a (singular) collective noun, which means 1(one) company. Even though a company represents a group of people, in the eye of law it is considered to be a single legal entity (an artificial person).
Example - Apple Inc. is an American multinational technology company headquartered in Cupertino, California.
following NBFCs have surrendered the Certificate of Registration granted to
them by the Reserve Bank of India. The Reserve Bank of India, in exercise of
powers conferred on it under Section 45-IA (6) of the Reserve Bank of India
Act, 1934, has therefore cancelled their Certificate of Registration.