Top groups on the street that isn't a sweatshop?

Just looking for a prestigious group with a "old boys club"/WASPy culture that's laid back, nothing unprestigious like a sweatshop culture (UBS LA, BMO M&M, GS TMT, MS M&A), looking for an uber-prestigious group that's chill like CVP M&A.

Any suggestions? I'd like it to be in a prestigious city like London, LA, Miami, Monaco or Ibiza if possible. No unprestigious locations like NYC.