The Hong Kong Stock Exchange has announced that shares of China's debt-laden Evergrande Group have been suspended from trading on Monday.
No reason was given for the halt and it remains unclear who initiated the suspension.
Officials say shares of Evergrande's property management unit are also being suspended.
The Chinese real-estate giant has deadlines looming for large interest payments on corporate bonds. That has made investors jittery about the possible impact on the country's economy and financial markets if it defaults or collapses.
Hong Kong's benchmark stock index fell more than two percent on Monday morning compared to the previous close.
Market sources in Hong Kong say investors are expecting some kind of announcement from Evergrande. For now, however, they say participants are waiting to see what the company has to say.