Danish investors and analysts spent the morning trying to figure out why a tiny biotechnology company suddenly soared almost 1,400% during US trading hours.

Orphazyme A/S says it has no idea why its American depositary shares surged overnight. When trading started in Copenhagen, the Danish shares rose as much as 76%. The company has now warned investors against being sucked into the frenzy.

“Investors who purchase the company’s ADS or shares may lose a significant portion of their investments if the price of such securities subsequently declines,” Orphazyme said on Friday morning.

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