Practice areas: Business Litigation, Securities Litigation, Antitrust Litigation
Licensed in Illinois since: 2003
Education: Washington University in St. Louis School of Law
Selected to Super Lawyers: 2025 - 2026 Winston Taylor
300 N La Salle DrSuite 4400
Chicago, IL 60654
William C. O'Neil is a top-rated attorney who practices law in Chicago, Illinois. William O'Neil focuses on Business Litigation issues. Additionally, he also helps clients with legal issues in the following areas of law: Securities Litigation and Antitrust Litigation.
William O'Neil received Super Lawyers designation for 2025 - 2026. He was selected for this honor subsequent to undergoing an evaluation of many different factors including peer recognition and professional achievement.
He became a licensed attorney in 2003. Before practicing law, he attended law school at Washington University in St. Louis School of Law and graduated in 2000.
Office location for William C. O'Neil
300 N La Salle Dr
Suite 4400
Chicago, IL 60654
