You can do what I do.
Instead of posting the specific companies you work or worked for, just write the industry type (i.e. say bank instead of Bank of Toronto), and the city it is located.
lhasfun has a good point too about the address/phone number. I never put my address or home number. I put my name and email address only. If you need to include a phone number, use your cell.
If a headhunter calls or emails you, you can always send him a resume yourself with the specifics.
CK