Chinese e-cigarette billionaire Chu Lam Yiu is under investigation from Chinese authorities, causing shares of her company, Hong Kong-listed Huabao International, to fall by over 65% on Monday.

Chu, who serves as chair and CEO, is currently under investigation for “suspected disciplinary violations” of an unclear nature, the fragrances and tobacco flavoring supplier announced on Monday. [...] Chu, 52, owns approximately 70% of Huabao International’s shares. Often dubbed “China’s vaping queen” for overseeing Huabao International’s entry into the e-cigarette market, Forbes estimates her net worth at $2.6 billion as of Monday’s close.