The number depends on the immigration route that you decide on. The Start-up Visa Program will allow you to bring a total of 5 members of your team, including yourself.
As mentioned in the ‘Start-up Visa Program’ section, each team member needs to hold at least 10% of shares/voting rights and must also be able to pass all required If one of your team members does not qualify, the application for the other members will be impacted as well.
Each team member is also allowed to bring their spouse and immediate dependents (children). All of these parties will receive PR through the Start-up Visa Program. They are also allowed to apply for work/study/visitor visas before their PR status is issued.