Assertio Holdings, Inc. (“Assertio” or the “Company”) (Nasdaq: ASRT), a specialty pharmaceutical company offering differentiated products to patients, today announced that its stockholders and the stockholders of Spectrum Pharmaceuticals, Inc. (“Spectrum”) (Nasdaq: SPPI), a biopharmaceutical company focused on novel and targeted oncology, have each approved the proposed definitive agreement pursuant to which Assertio will acquire Spectrum in an all-stock and contingent value rights (CVR) transaction.