Marco A. Dueñas



Marco A. Dueñas is an Associate in the New York office of Labaton Sucharow LLP.  A dedicated trial lawyer with more than a decade of experience in the legal industry, Marco prosecutes complex securities litigation cases in trial courts throughout the United States and abroad.  He focuses his practice on representing institutional investors in domestic and multinational securities cases to recover investment losses and vindicate shareholder rights.

Marco has been recognized as a New York Metro Rising Star by Super Lawyers.

Marco is a founding member of the team leading the Firm’s efforts to prosecute securities claims related to public offerings in state courts following the U.S. Supreme Court’s decision in Cyan, Inc. v. Beaver County Employees Retirement Fund.  Marco has also successfully represented dissenting shareholders in a foreign appraisal action in the Cayman Islands, securing a favorable judgment on behalf of his clients following a three-week bench trial.  Skilled in all phases of litigation including pleadings, dispositive motions, discovery, trial, and appeal, Marco develops innovative, fact-based case theories to expose violations of the securities laws and recover clients’ financial losses.

Marco has played a key role prosecuting and resolving several high-profile cases, such as those against Nord Anglia Education (more than $130 million judgment following a $37.68 per share fair value appraisal—a 16% premium over the take-private transaction price); ADT ($30 million settlement); Spectrum Brands Holdings, Inc. ($9 million settlement); and Livent Corporation ($7.4 million settlement).

Prior to joining Labaton Sucharow, Marco was a Paralegal at Harras Bloom & Archer LLP, where he focused on real estate litigation in state and federal courts, land use and zoning, and real estate transactions.  

Marco is an active member of the New York City Bar Association and the New York State Bar Association.

Marco earned his Juris Doctor, cum laude, from Brooklyn Law School, where he served as Associate Managing Editor and Senior Staff of the Brooklyn Journal of International Law.  Marco was also a competitor on Brooklyn Law School’s award-winning International Criminal Court Moot Court Competition team, achieving a first-place finish in the Americas and Caribbean regional round and reaching the semifinals of the international round held in The Hague, Netherlands.  Marco earned his Bachelor of Science, summa cum laude, from Farmingdale State College.

Marco is fluent in Spanish.


2019, New York

U.S. Court of Appeals
2022, Ninth Circuit

U.S. District Court
2019, Southern District of New York
2019, Eastern District of New York