The name of a company can't agree to anything. It would be like getting my birth certificate to sign legal documents for me because my wrist is sprained!
What is actually being said is something like, "The Board of Directors of Kemlok agree..." The members of the Board of Directors may change, but the company continues. In contracts, this is circumvented, and abbreviated from something like "The current Board of Directors, on behalf of and in the interests of the Kemlok Company, hereby agree...", to just the company name. The plural verb maintains the idea that it is not a name, not a building, but those people responsible for the management and operation of the company at that time, that they are doing the 'agreeing'.