ASRT ASSERTIO HOLDINGS INC Company Mergers 8-K Filing 2023 - Merger Agreement with Spectrum Pharmaceuticals, Inc. Assertio Holdings, Inc. announced its entry into a Merger Agreement with Spectrum Pharmaceuticals, Inc., in which Merger Sub will merge with and into Spectrum, with Spectrum surviving as a wholly owned subsidiary of Assertio.Get access to all SEC 8-K filings of the ASSERTIO HOLDINGS INC