Do you want a free one or a paid one?
Do you have an account to make payment?
Is the domain site trustworthy? Look at its certificates and reviews.
Are you running PHP or ASP?
Do you need web servers that execute open source codings like PHP, JSP, etc... or are you using an usual ASP?

Just off my mind...

i have a domain and i want to host it whats the best company

There is no best company, in m.o.

You should establish your needs, and then look for a company that can provide to those needs, at the best prize.

I agree with Kraai simply figure out what requirement's you need and that will help you decide if you need shared hosting or a vps or even a dedicated. It simply depend's best of luck to you. Make sure you read review's about the host first before signing up.