Lantheus and Curium merger faces FTC second request

Lantheus Holdings disclosed in an 8-K filed October 22, 2026 that on October 21, 2026, both the company and Curium US Holdings LLC received a "Second Request" from the Federal Trade Commission in connection with the FTC's review of the merger between the two companies.¹

The underlying deal was first disclosed earlier: on August 3, 2026, Lantheus entered into an Agreement and Plan of Merger with Curium US Holdings LLC and Coco Merger Sub Inc., a Delaware corporation and wholly owned subsidiary of Curium, under which Merger Sub would merge into Lantheus, leaving Lantheus as a wholly owned subsidiary of Curium.¹ The transaction remains conditioned on, among other things, expiration or termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act.

A Second Request has a specific procedural effect. It extends the HSR waiting period until 30 days after both the company and Curium have substantially complied with the request, unless the FTC ends the period sooner.¹

Lantheus said the parties expect to promptly respond to the Second Requests and to continue working cooperatively with the FTC during its review of the merger.¹ The filing added that completion of the merger still depends on expiration or termination of the HSR waiting period along with satisfaction or waiver of other closing conditions in the merger agreement.¹

Despite the added regulatory step, Lantheus and Curium continue to expect the merger to close in the first half of 2027.¹ The filing was signed by Daniel M. Niedzwiecki, Lantheus's Chief Administrative Officer and General Counsel, on October 22, 2026.