There is no precise metric to look at. The smaller a company, the more critical the CEO is. If a company becomes 1000 and 10’000 people, the relative importance of the CEO begins to diminish and the value of the team grows.
I once told a room of 200 professional investors at an investment conference in Omaha that I would give twenty bucks to anyone in the room that could name four CEOs of Exxon after John D. Rockefeller. Nobody could step up to collect the money.
– Tom Gayner