Oliver H. Thomas is an experienced litigator focusing his practice on complex commercial litigation. His representation spans an array of industries and includes a wide variety of clients, including local and national banks, a leading Missouri liquor distributor, a large nonprofit health corporation, and numerous manufacturers. Oliver devotes a significant portion of his practice to representing clients in high-stakes class action lawsuits, including cases involving alleged violations of state and federal consumer protection laws. 

Oliver has successfully represented both plaintiffs and defendants in complex litigation involving breach of contract claims, breach of warranty claims, real estate claims, construction claims, and products liability claims, as well as disputes involving franchising, trusts and estates, and general business matters. He is licensed to practice in both Missouri and Illinois and has appeared before state and federal courts across the country.

In addition to his litigation practice, Oliver regularly advises clients on antitrust compliance, particularly as it relates to the antitrust pre-acquisition reporting requirements set forth in the Hart-Scott-Rodino Antitrust Improvements Act of 1976. He has secured antitrust clearance from the U.S. Department of Justice and the Federal Trade Commission in billions of dollars’ worth of transactions spanning a variety of industries.

Oliver was selected for inclusion in Missouri & Kansas Rising Stars® 2014-2018.

Practice Areas


  • Saint Louis University School of Law (J.D., magna cum laude, 2008)
    • Order of the Woolsack
    • Academic Excellence awards in Legal Research and Writing and in Alternative Dispute Resolution
  • University of Notre Dame (B.A., magna cum laude, 2005)

Legal Background

  • Intern, St. Louis Federal Defender's Office (January-May 2008)
  • Summer associate, Lewis Rice LLC (2006, 2007)
  • Judicial intern, The Hon. Catherine D. Perry, U.S. District Court, Eastern District of Missouri (August-December 2007)

Professional Affiliations

  • American Bar Association
  • Bar Association of Metropolitan St. Louis


  • U.S. Court of Appeals, Eighth Circuit
  • U.S. District Courts
    • Eastern District of Missouri
    • Western Districts of Missouri
    • Southern District of Illinois
    • District of Kansas
  • Missouri Bar
  • Illinois Bar

Charitable & Civic Activities

  • Member, Christ the King Parish in University City
  • Member, Notre Dame Club of St. Louis