Translation:Where is your company?
公司 means the company or firm. For someone who works in a company it might be used, as the word work is used in English, to mean the place where you do work. E.g. "I am at work" . But if you don't work in a company then you can't use it this way. A nurse in the hospital is "at work" but we don't say ＂在公司＂ for a hospital because it's not a company.