Matthew J. Letten

Senior Associate

F: (860) 331 8913
F: (202) 354 5230
Overview Experience Insights Education and Credentials Recognition and Community


Matthew Letten, a litigator, represents businesses and individuals in civil and criminal matters.

Matt represents clients in civil litigation matters in federal and state courts and arbitrations. He handles complex business and real estate disputes involving allegations of breach of contract, breach of fiduciary duty, fraud and unfair trade practices. Matt has experience with all phases of discovery and drafting critical motions and briefs. Matt has briefed numerous appeals in the Second Circuit and the Connecticut Appellate Court.

In addition, Matt helps clients respond to criminal, civil and regulatory investigations brought by federal and state agencies, including the Department of Justice (DOJ), the U.S. Securities and Exchange Commission (SEC) and the Consumer Financial Protection Bureau (CFPB). He regularly defends businesses in government investigations and related litigation involving alleged violations of the False Claims Act (FCA).

Following graduation from Yale Law School, Matt served as a law clerk for the Honorable Thomas L. Ambro of the U.S. Court of Appeals for the Third Circuit and the Honorable Paul S. Diamond of the U.S. District Court for the Eastern District of Pennsylvania. Before joining Day Pitney, Matt practiced law for several years at an international law firm in Washington, DC.


Prior results do not guarantee a similar outcome.

Represented the plaintiff, a family-owned business, in litigation involving breach of a lease agreement, breach of fiduciary duty and fraudulent misrepresentation

Defended a pharmaceutical company in False Claims Act litigation related to a Department of Defense contract

Represented the plaintiff, a U.S.-based entertainment company, in a multiparty international arbitration involving the breach of a license agreement that resulted in a substantial damages award for the plaintiff, as well as an award of attorney’s fees and costs

Represented a foreign company in a Second Circuit appeal challenging the constitutionality of state tax regulations

Defended a U.S.-based manufacturing company in a federal grand jury investigation involving allegations of financial reporting and tax fraud

Advised a U.S. bank in a CFPB investigation concerning sales practices

Represented a healthcare company in a False Claims Act investigation involving allegations of improper referral payments and medical billing fraud

Achieved a favorable result and probationary sentence for a client facing criminal tax fraud charges


Education and Credentials

Yale Law School, J.D.,

Yale Law Journal, Notes Editor

University of Notre Dame, B.A.,

magna cum laude, Phi Beta Kappa

State of Connecticut
District of Columbia
U.S. District Court, District of Connecticut
U.S. District Court, District of Columbia
U.S. District Court, Southern District of New York
U.S. Court of Appeals for the Second Circuit
U.S. Court of Appeals for the Third Circuit
U.S. Supreme Court

Recognition and Community


No aspect of these advertisements has been approved by the highest court of any state. See Awards Methodology.

Selected to the list of Ones to Watch for Commercial Litigation by The Best Lawyers in America (Woodward/White, Inc.), 2023-2024

Selected to the list of Connecticut Super Lawyers Rising Stars (Thomson Reuters), Civil Litigation, 2020, 2022-2023