The kinds of claims that get brought
Antitrust lawsuits generally involve either agreements that restrain competition, such as price-fixing or market allocation among competitors, or conduct by a dominant firm that shuts out rivals. Federal law and state laws, including New York's Donnelly Act, both apply, and private parties can sue alongside government enforcers. Federal antitrust law allows a successful private plaintiff to recover more than its actual damages, along with attorney's fees, which is part of why these cases are so heavily litigated. Whether you bought directly from the defendant or further down the distribution chain matters, because federal and state law treat indirect purchasers differently.
Proof is economic as well as factual
Many antitrust cases turn on how the relevant market is defined and whether the conduct harmed competition rather than just one competitor. That analysis usually requires economists as retained witnesses and substantial data on prices, sales, and market shares. Plaintiffs should preserve their own purchase and pricing records and the communications showing how the conduct affected them. Companies on the receiving end should preserve documents broadly and be careful about internal messages describing competitors or market strategy, which are often the most quoted evidence in these cases. These cases also tend to involve extensive discovery of business documents, often reaching back over a long stretch of the company's history.
First decisions
We start by asking what happened, who was affected, and whether a government investigation may already be underway, since parallel criminal or civil proceedings change the strategy. For potential plaintiffs, we consider whether an individual claim, a class action, or a complaint to enforcers makes the most sense, and whether a time limit may already be running. For defendants, we assess the claims and whether early motions can narrow them. Antitrust cases tend to be expensive and long, so we discuss cost and the business relationships at stake from the beginning. Where an investigation is already public, private plaintiffs often shape their claims around what the government has disclosed.
