William L. Banowsky

William L. Banowsky

  • 214.969.1231
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  • Thompson & Knight LLP
    One Arts Plaza
    1722 Routh Street, Suite 1500
    Dallas, TX 75201 USA
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Bill Banowsky focuses his practice on complex business litigation and arbitration, securities litigation, and corporate governance investigations. He also represents national and international energy industry clients in various disputes involving contract rights and business torts. In recent years, he has become involved in numerous disputes representing healthcare providers including hospitals, ambulatory surgery centers, medical device suppliers, physician groups and ancillary providers.

Bill has extensive experience in contract disputes, corporate shareholders rights, director and officer liability claims and disputes, and environmental impact litigation. His securities and corporate governance practice includes the representation of audit committees in Sarbanes-Oxley investigations involving conduct occurring in the United States, Bolivia, Brazil, Nigeria, Iraq, and China.

Bill has also represented several local school districts in matters involving the First Amendment, open meetings and open records matters, school finance litigation, and general issues involving education.

Bill is Board Certified in Civil Trial Law by the Texas Board of Legal Specialization.


Securities Litigation and Corporate Governance Investigations

  • Obtained verdict for client in securities fraud case involving a $50 million private placement

  • Represented multibillion-dollar investment fund in fraud and breach of fiduciary claim filed by investors

  • Represented Special Litigation Committee of NYSE company in stock option backdating investigation

  • Represented the audit committee of a NYSE Company in review and investigation into dating of stock option grants

  • Represented the audit committee of a NASDAQ national transportation company investigating the activities, including questionable billing practices, directed by the COO of the Company

  • Represented a NYSE Company investigating certain contractual agreements involving illegal kickbacks

  • Represented a NYSE Company in internal review of ethics complaints filed against top officers

  • Represented the audit committee of a NASDAQ company regarding the activities of a China subsidiary

  • Represented the audit committee of a NYSE company in the investigation of questionable accounting practices by a division CEO

  • Represented a telecommunications company and its officers in a securities fraud class action

  • Represented a broker in a multi-party litigation and before the Securities and Exchange Commission relating to the sales of unregistered securities

  • Represented the audit committee of an NYSE company in the investigation of the activities of the company in Africa, South America, and the Middle East

  • Represented an audit committee of an NYSE company in a Sarbanes-Oxley investigation of CEO activities

  • Represented the director of a waste disposal company in a securities class action

  • Represented an internet media company in a securities fraud class action

  • Represented a national retailer in a securities fraud class action

Energy Industry Litigation, Arbitration, and Investigations

  • Represented buyer of gas producing company in a series of post-purchase arbitrations

  • Represented an oil and gas exploration company in a breach of contract dispute arising from the sale of mineral interests in the Gulf of Mexico

  • Represented a major chemical distributor in a grand jury investigation into price fixing of products

  • Represented oil and gas partnership in formal investigation by the Securities and Exchange Commission

  • Represented a target energy company in litigation arising from merger

  • Represented the audit committee of a NYSE company in the investigation of allegations of violations of the Foreign Corrupt Practices Act and U.S. antitrust law

  • Represented the officers and directors of an offshore oil and gas drilling company in a securities fraud class action

  • Represented an oil and gas company in a multi-plaintiff property damage class action resulting from a pipeline break

  • Represented an oil pipeline company in multi-state litigation involving environment contractual indemnities

  • Represented oil and gas producers in claims brought by surface interest owners for surface and subsurface contamination

  • Represented oil and gas producers in a major class action involving saltwater disposal practices

Complex Business Litigation and Arbitration

  • Represented defense contractor in dispute with subcontractors

  • Represented a fund-of-funds company in arbitration and litigation against former partner in purchase of business

  • Represented a U.S. company in a successful contract arbitration with Chilean company

  • Represented an international oil and gas company with regard to Congo concessions

  • Represented a national retailer in claims against the administrator of its extended service plans

  • Represented a national retailer in a claim against the insurance company underwriting its extended warranty program

  • Represented a life insurance carrier in a class action regarding policy language and dividend practice in which class certification was denied

  • Represented an insured in litigation and international arbitration in insurance coverage cases arising out of an industrial accident which damaged millions of dollars in equipment

  • Represented a charitable foundation in an arbitration against its investment advisor for investment losses

  • Represented a life insurance carrier in a series of cases related to the sales and marketing of variable life products

  • Represented a government contractor in an investigation by the Department of Defense regarding whistleblower claims

  • Represented limited partners against the general partner in a series of real estate limited partnerships asserting claims for fraud and mismanagement

  • Represented an e-tailer in a copyright infringement suit involving products sold on the e-tailer's web site

  • Represented real estate developer arbitrations across the country dealing with multiple architectural contracts

  • Represented a NYSE company in multiple arbitrations arising from dealer terminations

Healthcare Industry Litigation and Investigations

  • Obtained millions of dollars in settlement for healthcare providers against health insurance plans and companies who wrongfully denied payment

  • Represented providers asserting Prompt Pay Claims against payers

  • Obtain a favorable result for a medical device vendor against claims of fraud and other improper practices

  • Represented healthcare provider in investigation of whistleblower claims related to billing practices

  • Represented healthcare providers in disputes related to practice group or network relationships

  • Represented healthcare provider in dispute alleging fraudulent billing practices

  • Represented healthcare providers in professional liability matters


  • Dallas Corporate Compliance Law "Lawyer of the Year," The Best Lawyers in America® by Woodward/White Inc.; 2016; 2018

  • Dallas Litigation - Mergers & Acquisitions "Lawyer of the Year," The Best Lawyers in America® by Woodward/White Inc.; 2014

  • The Best Lawyers in America® by Woodward/White Inc. (Commercial Litigation, Corporate Compliance Law, Corporate Governance Law, Litigation-First Amendment, Litigation-Mergers & Acquisitions, Litigation-Regulatory Enforcement (SEC, Telecom, Energy), Litigation-Securities); 2006-2019

  • Texas Super Lawyers® by Thomson Reuters (Business Litigation, Securities Litigation, Class Action/Mass Torts); 2003-2018

Activities (Memberships/Affiliations)

  • Advisory Board Member, National Association of Corporate Directors, North Texas Chapter; Program Committee, 2009-2010

  • Member, American Bar Association

  • Member, Dallas Bar Association

  • Member, Texas Bar Association

  • Member, College of the State Bar of Texas

  • Fellow, Texas Bar Foundation

  • Fellow, Dallas Bar Foundation

  • Member, Federation of Defense and Corporate Counsel; Chair, Business Torts and Commercial Litigation Section, 2001-2003

  • Member, DRI-The Voice of the Defense Bar

  • Member, American Health Lawyers Association

Community Organizations

  • Member, Highland Park Education Foundation Business Counsel

  • Member, Dallas Volunteer Attorney Program

  • Pro-bono Legal Matters for Non-profit Organizations

  • La Fiesta de Seis Banderas, Order of the Flags