What company do you work for?
Which company are you with?
Who do you represent?
What is the name of your company?
Where are you located?
The name of our company is . . . .
Our company is located in . . . .
Our headquarters is in . . .
What (type of business) do you do?
What business are you in?
We are in the computer business.
We're in computers
We sell . . .
We produce . . .
We manufacture . . .
Our major products are . . .