0001356576 2021-08-04 2021-08-04 false 0001356576 8-K 2021-08-04 Supernus Pharmaceuticals, Inc. DE 001-35518 20-2590184 9715 Key West Ave Rockville MD 20850 301 838-2500 Common Stock, $0.001 par value per share SUPN NASDAQ false false false false false