To determine which law firms represent America’s largest corporations, we searched public records to find outside counsel used by the Fortune 100 for contracts litigation, labor litigation, torts litigation, intellectual property litigation and patent prosecution.

We searched LexisNexis Total Litigator, which provides access to U.S. district civil courts, and Lexis Patent Optimizer for patent prosecution. For contracts litigation, for example, we included categories such as insurance and contract products liability, while for torts litigation we included personal injury and personal property. Included in our labor litigation search categories were the Fair Labor Standards Act and other labor-related suits, while intellectual property litigation encompassed copyrights, patents and trademarks.