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Mason N. Floyd

fax +1 312.517.7581

Mason N. Floyd defends individuals and corporate clients in litigation and government investigations conducted by the Department of Justice (DOJ), Securities and Exchange Commission (SEC), Federal Deposit Insurance Corporation (FDIC), Department of Homeland Security (DHS), Immigration and Customs Enforcement (ICE), and Internal Revenue Service (IRS). Mason also represents clients in complex civil litigation matters in federal and state courts across the country.

False Claims Act Matters

Mason’s recent work includes defending healthcare providers, medical billing companies, and pharmacy owners in False Claims Act litigation and parallel criminal investigations.

White Collar Criminal Defense and Counseling

Mason represents individual and corporate defendants facing federal criminal prosecution arising from allegations of wire and mail fraud, tax fraud, insider trading, healthcare fraud, environmental crimes, mortgage fraud, and conspiracy. Mason routinely counsels individuals and companies subject to SEC subpoenas and investigations concerning alleged violations of securities laws with respect to a wide variety of financial transactions.

On behalf of individuals, Mason represents and counsels sales executives of pharmaceutical companies charged with violations of the Medicare Anti-Kickback laws, as well as physicians and office managers in healthcare fraud investigations. He has represented multiple foreign nationals in major U.S. and foreign antitrust investigations.

Cybersecurity Litigation

Mason defends a variety of clients in disputes related to data breaches, privacy violations, technology contracts, and violations of the Computer Fraud and Abuse Act and Stored Communications Act, amongst other statutory violations. He has litigated matters, including class actions, in multiple jurisdictions in both state and federal courts on data breaches.

Financial Institutions Representation

Mason regularly represents and counsels an Illinois bank on numerous matters involving issues related to the Uniform Commercial Code, Bank Secrecy Act, Anti-Money Laundering, and Compliance-related issues.

Complex Commercial Litigation Counseling and Advocacy

In other complex commercial litigation matters, Mason represents many client companies in employment discrimination and retaliation lawsuits.


J.D., Indiana University Robert H. McKinney School of Law, Indianapolis, Indiana, 2004
B.A., DePauw University, Greencastle, Indiana, 2001


Rising Star in White Collar Criminal Defense Litigation since 2014, Illinois Super Lawyers

Emerging Lawyer by Leading Lawyers in Commercial Litigation since 2015


American Bar Association, Section on Litigation

Federal Bar Association, Chicago Chapter

Kohl Children’s Museum of Greater Chicago, Development Board Member 2014 – present, President 2022 – present

Big Brothers Big Sisters of Metro Chicago, 2005-2007

State Bar Licenses


Court Admissions

U.S. District Ct., N.D. of Illinois
U.S. District Ct., N.D. of Illinois Trial Bar
U.S. Tax Court
U.S. Court of Appeals, 7th Circuit

Representative Matters

  • Obtained complete dismissal for a group of clients in District Court and successfully argued and won affirmation by a three-judge panel at the Seventh Circuit.
  • Successfully advocated for a client in a securities fraud action before an SEC panel including the Deputy Director of Enforcement.
  • Successfully negotiated and resolved an insider trading investigation.
  • Advised client on the avoidance of enforcement actions on behalf of multiple entities in relation to EB-5 investments.
  • Represented an individual in an SEC action alleging an investment fraud scheme involving millions of dollars.
  • Helped the defense of an individual in an investigation of international racketeering conspiracy and commercial bribery involving over $18.5 million in alleged bribes to foreign government officials. He has also represented individuals in matters alleging criminal violations of the Clean Water Act and related environmental statutes.
  • Successfully defended a records management company in a data breach matter seeking over $5 million in damages.
  • Defended two traders of a national banking institution in a securities fraud action involving more than $500 million in damages.
  • Obtained a temporary restraining order and permanent injunctive relief against three former executives who misappropriated patented technology from a major corporation and started a competing business in China.
  • Presenter, “Trial Advocacy for Civil Litigators – Cross Examination: Rules of the Game,” Illinois Institute for Continuing Legal Education, October 2019
  • Presenter, “Practical Applications: Part II – Foundations in the Digital Age,” Illinois Institute for Continuing Legal Education