This document summarizes a webinar on recent developments in health care antitrust law. It discusses the Department of Justice and Federal Trade Commission's continued strong enforcement of mergers and monopolization cases. Recent challenges have involved health insurance mergers, as well as "problematic contracting practices" between payors and providers. The webinar also addressed antitrust issues involving provider collaborations and networks, noting the need for real integration and clinical justification rather than empty claims or "united front" price fixing. Recent court cases involving hospital mergers were also summarized.