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Valeant shares tumble on Andrew Left's new short position

Andrew Left, Citron Research
Michael Newberg | CNBC
Andrew Left, Citron Research

Shares of embattled Valeant Pharmaceuticals fell nearly 5 percent Wednesday after The Street reported short-seller Andrew Left took a new short position in the stock.

"I think it's obvious it's a zero now," Left told The Street. Left's firm, Citron Research, did not immediately respond to CNBC's request for comment.

Left's new position comes about two months after he told CNBC he had taken a long position in Valeant shares. That said, Left wasn't too optimistic about Valeant at the time, despite his long position.

"You still might say the stock is uninvestable," he said May 17.

Valeant shares have been punished by investors over the past year, falling 90 percent.

Click here for The Street's full report.