The Fortune 400 are generally people who found an early niche and exploited it in a way that created barriers to entry. That could be in software, but it could

The Fortune 400 are generally people who found an early niche and exploited it in a way that created barriers to entry. That could be in software, but it could be in dominating natural resources in a country, government-sanctioned monopolies, or excellence in squeezing efficiencies out of economies of scale. It's more proscriptive, I feel, to try to find people around you who you think are successful, and ask them, not the outliers in a magazine.