0001356576 2021-05-20 2021-05-20 iso4217:USD shares iso4217:USD shares 0001356576 false 8-K 2021-05-20 Supernus Pharmaceuticals, Inc. DE 001-35518 20-2590184 9715 Key West Avenue Rockville MD 20850 301 838-2500 Common Stock, $0.001 par value per share SUPN NASDAQ false false false false false