Have you ever stopped to think about how an executive can rise and fall so quickly in the market? Well, Sergio Rial’s story is practically a textbook case of that.

This guy started from scratch in 1984 at ABN AMRO, then went on through Bear Stearns, Cargill, and Marfrig, and in 2016 reached the top as CEO of Santander Brasil. Six years of solid management, growing numbers, and accelerating digitalization. The bank was doing great. But then comes the plot twist nobody expected.

In January 2023, Sergio Rial takes over Americanas. Seriously, the market went crazy. Shares surged 20% in days, adding 2 billion reais in value. Everyone thought it was the salvation. But 10 days later? He leaves the company after discovering a 20 billion hole in the balance sheets—massive accounting inconsistencies that nobody had seen.

That was the bomb that blew everything up. One of the biggest corporate crises in Brazil in recent years. And Sergio Rial became a symbol of it—not because it was his fault, really, but because he was the one who uncovered the mess.

He has a degree in Law from UFRJ, specializes in Economics, and has always worked with a focus on efficiency and results. His style is aggressive and communicative—nothing conservative. He believed in meritocracy and holding people accountable based on performance. That worked well at Santander, but when he arrived at Americanas, he found a rotten corporate governance system.

After 2023, Sergio Rial continues to have a presence in debates about corporate management and risk. His name has been etched into recent history in Brazil’s financial market. For anyone who invests, the lesson is clear: keeping track of who is leading companies is just as important as analyzing financial statements. Executives like Sergio Rial show that management decisions can make or break an entire company.

The market always reacts to these kinds of moves. That’s why it’s worth understanding these stories before making any investment decision.