Lantheus Holdings, Inc. and Curium US Holdings LLC received a Second Request from the Federal Trade Commission on October 21, 2026, extending the regulatory waiting period for their pending merger. The antitrust scrutiny raises questions about the timeline for completing the deal, which both parties continue to expect will close in the first half of 2027.
The Second Request, issued under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, requires Lantheus and Curium to provide additional information and documentary materials to the FTC. This action pauses the initial waiting period until 30 days after each company has substantially complied with the request, unless the FTC terminates the period sooner. Lantheus stated it expects to respond promptly and will continue to work cooperatively with the agency during its review.
The merger was originally disclosed on August 3, 2026, when Lantheus entered into an Agreement and Plan of Merger with Curium US Holdings LLC and Coco Merger Sub Inc. Under the terms, Coco Merger Sub will merge with and into Lantheus, leaving Lantheus as a wholly owned subsidiary of Curium. The transaction remains subject to the expiration or termination of the HSR waiting period and the satisfaction or waiver of other closing conditions specified in the Merger Agreement.
Lantheus identified several risks that could cause actual results to differ from current expectations. These include uncertainty regarding the timing of the merger, the possibility that closing conditions may not be met on the expected timetable or at all, and the potential termination of the Merger Agreement. The company also noted uncertainties associated with contingent value rights milestones and payments to holders.
Additional risks cited in the filing include business disruption from the pending transaction, which could affect suppliers, business partners, employees, and competitors. Management time and attention may be diverted from ongoing operations, and there is a risk of changes to Lantheus's business plans between announcement and closing. The company also acknowledged that the merger or its announcement could affect its share price.
The filing was signed by Daniel M. Niedzwiecki, Chief Administrative Officer and General Counsel, on October 22, 2026. Lantheus common stock, with a par value of $0.01 per share, trades on The Nasdaq Global Market under the symbol LNTH. The company is headquartered at 201 Burlington Road South Building in Bedford, Massachusetts.