Short interest in Ciena Corp (NYSE:CIEN) increased during the last reporting period, rising from 4.15M to 4.41M. This put 3.98% of the company's publicly available shares short.

Short interest for Ciena gives investors a sense of the degree to which investors are betting on the decline of Ciena's stock. Short interest data is updated every two weeks.

Based on the recent average volume of 1.22M shares traded per day, it would take 3.61 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.