What it is
Antitrust reviews are conducted by regulatory bodies, such as the Federal Trade Commission (FTC) and the Department of Justice (DOJ) in the U.S., before large mergers or acquisitions can proceed. The goal is to prevent anti-competitive practices that could harm consumers through higher prices, reduced choices, or stifled innovation. Regulators analyze market concentration, potential barriers to entry, and the combined entity's power to dictate terms.
News of an antitrust review can significantly impact the stock prices of companies involved in a proposed merger, as regulatory hurdles introduce uncertainty about the deal's completion. If regulators demand concessions (like selling off parts of the business) or block the deal entirely, the target company's stock typically falls, while the acquirer's may rise. Retail investors track these reviews to assess the likelihood of a deal closing and its potential implications for their holdings.
Why it matters
Antitrust reviews can block or alter major corporate mergers, directly impacting stock prices and the competitive landscape of entire industries.
Reviewed under editorial standardsUpdated September 26, 2026Not investment advice