No. 121
ECO BCG
CEO: Sergio Castillo
Category: Engineering
Three-year revenue growth: 4,030%
• In 2009, Sergio Castillo stepped out of a corporate career in manufacturing with 3M to take over Eco BCG, the consultancy his father had started a decade before. After a time, Castillo, 54, concluded that the company was in the wrong country (Panama), the wrong market (South America), and the wrong business (consulting). So he reincorporated in Minnesota as
