両〜 means 'both' and attaches to a short noun: 両社, 両国 (both countries), 両者 (both parties).
Watch out
両者 (both parties, both people) has the same reading. In speech, context tells them apart; 両社 is used only for companies.
Common collocations
- 両社の合併: the merger of the two companies
- 両社が提携する: the two companies form a partnership
- 両社の関係: relations between the two companies