CXRX: April 15th short interest up...April 15: 5,891,385 (vs 4,203,933 on Mar. 31st)
Increase: 1,687,452 shares (approx 40.1%)
Short interest on Apr. 15th represents 14.4% of float and would take approximately 20 days at average volume, to cover.
https://www.wsj.com/mdc/public/page/2_3062-shtnasdaq_C-listing.html