If you want to speak for your company, then you speak for your company. You have freedom of speech. Same goes for Joe.
If a company is just "people acting together/cooperating", then there is no company -- it's not a person, nor even a thing; it's just something people do. ("Acting together" and "cooperating" are both verbs.)
This "free speech for companies" malarkey is what "companies" (= (usually rich) people) hide behind when "the company" does bad shit. Granting "companies" legal personhood is one of the bigger reasons the USA are as fucked up as they are.
Do I have freedom of speech? How about Joe Smith?
Assuming that the answer is yes, why do Joe and I acting together/cooperating not have freedom of speech?
I ask because a company is people acting together/cooperating.
Also, what about unions and public advocacy organizations?