prepositions - Working in / for / at?

Which is the correct way to tell where I'm working?

• I'm working in XYZ company.


• I'm working for XYZ company.


• I'm working at XYZ company.

Or is there any difference in the meaning?

Answer

To indicate the company you are working for, I would say:

I'm working for XYZ company

It points out that you consider yourself a dedicated employee.

I'm working at XYZ company

has a similar meaning, but I would more likely use it to say you just work somewhere, maybe at a job you don't like alot. You are just there.

If referring to a company location, at can also be OK

I'm working at XYZ company in San Diego.

I don't think I would normally use

I'm working in XYZ company