STB Pauses UP-NS Merger Review, Demands More Data by July 27

The Surface Transportation Board conditionally accepted Union Pacific’s (NYSE: UNP) revised application to acquire Norfolk Southern (NYSE: NSC) but delayed formal review, requesting additional information by July 27. The regulator stated the refiled application only narrowly meets completeness standards, pushing the potential deal closing well into fall 2027 in a best-case scenario, according to TD Cowen analysts. The STB expressed skepticism over the merger’s proposed committed gateway pricing, noting it excludes major freight categories like intermodal and autos and may unintentionally weaken competition. The board also demanded a facility-by-facility analysis of shippers whose rail options would shrink. Markets reacted sharply, with the two railroads losing about $12 billion in combined market value on the news. The decision signals the regulator will conduct a thorough, discovery-led review, placing a significant administrative burden on both the companies and observers.