Comment by mattwritescode

As a CTO I would guess something from 4% - 6% some will get more depending on a number of factors. The thing is a CTO could get 10%, but if it is a bad idea or mismanaged then that 10% might be worth $0 after 4 years. A well managed, great idea might still get you $0 but it might also get you $1,000,000. You never know. You have to way up if you think this idea is something which will be viable.