The 9 most prestigious consulting firms in the world
https://igotanoffer.com/blogs/mckinsey-case-interview-blog/top-consulting-firms
The top three strategy consulting firms in the world serve nearly all Fortune 1000 companies and are commonly referred to as MBB:
They earn the highest revenue among strategy consultancies and have generally been around the longest.
The remaining 6 consultancies covered here include the strategy arms of the Big 4 and other mid-tier sized firms known to be amongst the top strategy consulting houses in the world: