Konstantine P. Diamaduros

Konstantine Diamaduros is a Shareholder of the Firm's Compliance and Investigations practice group. Konstantine concentrates on government and internal investigations, white-collar criminal defense, and a broad range of high-stakes civil litigation. From a civil litigation perspective, Konstantine frequently litigates a wide range of shareholder disputes, contract disputes, and commercial landlord-tenant disputes in both state and federal court. Konstantine is also experienced in defending clients against tort claims and products liability claims and is currently representing multiple defendants in PFAS-related litigation filed in both federal and state court. From a white-collar perspective, Konstantine’s practice focuses primarily on whistleblower claims under False Claims Act, healthcare fraud, and criminal and grand jury investigations for individuals and companies. Konstantine has handled appellate matters in both state and federal court and is also experienced in helping guide individuals and businesses through internal investigations when they or their employees are accused of violating criminal or civil laws.  

Some of Konstantine’s recent, high-profile matters include:

• Currently defending a Fortune 500 company in several related False Claims Act qui tam cases pending in the United States District Court for the District of South Carolina. 
• Currently defending a company in the Aqueous Film-Forming Foams (AFFF) Products Liability Multidistrict Litigation.
• Currently defending multiple companies in the South Carolina statewide PFAS-related litigation.
• Currently defending a South Carolina company in PFAS-related litigation in Georgia.
• Currently defending a Fortune 500 company in a complex civil case in the District of South Carolina arising out of a suicide bombing event in Afghanistan. 
• Currently defending a Fortune 500 company in the South Carolina statewide opioid-related litigation.  
• Served as co-counsel for the South Carolina House of Representatives in statewide redistricting litigation. 
• Assisted in handling a complex internal investigation for a Fortune 500 company related to a nuclear project. 
• Assisted in handling an internal investigation and obtaining a favorable outcome for a Fortune 500 company related to the LOGCAP IV contract in Afghanistan.
• Assisted in handling an internal investigation and obtaining a favorable outcome for a subsidiary of a Fortune 500 company in a case involving alleged violations of the False Claims Act.

Konstantine is licensed to practice in all South Carolina courts and the Fourth Circuit Court of Appeals. In addition, he has been admitted to practice pro hac vice (for the purpose of a particular case) in other courts, including the Southern District of Texas and the District of New Hampshire. 

Prior to joining the firm, Konstantine graduated from Wofford College and the University of South Carolina School of Law. After graduating from the University of South Carolina School of Law, Konstantine clerked for the Honorable Joseph F. Anderson, Jr. in the United States District Court for the District of South Carolina before joining Maynard Nexsen in the fall of 2016.

Community & Professional

• South Carolina Bar 
• Greenville County Bar Association
• S.C. Ducks Unlimited, Greenville Chapter, Committee Member
• Meals on Wheels Young Professionals, Member
• Greenville Chamber of Commerce - Young Professionals, 2023 

Recognition

• Best Lawyers in America "Ones to Watch" for Criminal Defense: White Collar, 2025
• South Carolina Super Lawyers Rising Stars, Criminal Defense/White Collar, 2024
• GSA Business Report Forty Under 40 Class, 2023
• TALK Greenville Magazine Top Lawyers, 2022-2024 
• Greenville Business Magazine Legal Elite in Business Litigation, Criminal, and Insurance, 2021; Criminal - White Collar and Insurance, 2022-2023; Business Litigation and Civil Litigation, 2024

Law School Honors

• Order of the Wig and Robe
• Order of the Coif
• Moot Court Bar, Order of the Barristers

Multimedia

Black History Month Spotlight: Konstantine Diamaduros on Jackie Robinson

In honor of Black History Month, we are highlighting leaders who have made an impact on business and the community. Today, Greenville attorney Konstantine Diamaduros shares the accomplishments and influence of Jackie Robinson.