Pomerantz LLP

Matthew L. Tuccillo


New York

Securities Litigation

Georgetown University Law Center

The Supreme Court of the United States; Commonwealth of Massachusetts; State of New York; State of Connecticut; U.S. Court of Appeals for the Second and Ninth Circuits; U.S. District Courts for the Districts of Massachusetts, Connecticut, the Southern District of New York, the Eastern District of New York the Northern District of Illinois, and the Southern District of Texas


  • Biography
  • Publications
  • Cases
  • Awards
  • News

Matthew L. Tuccillo joined Pomerantz in 2011 and was named a Partner in December 2013.  With 18 years of experience, he has been honored as a 2016 and 2017 Super Lawyers® “Top-Rated Securities Litigation Attorney,” a recognition bestowed on just 5% of eligible attorneys in the New York Metro area, after a rigorous nomination, peer evaluation, and independent research process overseen by Thompson Reuters.  Since 2016, he has been a recommended securities litigator by The Legal 500, which evaluates law firms worldwide for cutting edge, innovative work based on client feedback, practitioner interviews, and independent research.  Since 2014, he has maintained Martindale-Hubbell’s highest-available AV® Preeminent™ peer rating, scoring 5.0 out of 5.0 in Securities Law, Securities Class Actions, and Securities Litigation while being described as a “First class, top flight lawyer, especially in complex litigation.”  His advocacy has been covered by Bloomberg, Law360, and the Houston Chronicle, among others. 

He is responsible, on an ongoing basis, for the Firm’s litigation of numerous securities fraud class actions pending nationwide, currently including:  In re KaloBios Pharmaceuticals, Inc. Securities Litigation, No. 15-cv-05841 (N.D. Cal.); Perez v. Higher One Holdings, Inc., et al., No. 14-cv-00755-AWT (D. Conn.); Plumley v. Sempra Energy, et al., No. 16-CV-512 (S.D. Cal.); Altayyar v. Etsy, Inc., No. 17-1180 (2d Cir.); and Tucci v. The Toronto-Dominion Bank, 1:17-cv-01735 (D.N.J.).

Mr. Tuccillo oversees and is the lead litigator on the Firm’s securities fraud lawsuits arising from BP’s 2010 Gulf oil spill, pending in Multidistrict Litigation 2185, In re BP p.l.c. Secs. Litig., No. 4:10-md-2185 (S.D. Tex.).  He briefed and argued successful oppositions to three rounds of BP’s motions to dismiss the claims of roughly 100 institutional investors, drawing the court’s praise for the “quality of lawyering,” which it called “uniformly excellent.”  In leading the BP litigation, Mr. Tuccillo has secured some of the Firm’s most ground-breaking rulings:

  • He successfully argued that foreign and domestic investors had asserted viable “holder claims” seeking to recover investment losses due to their retention of already-owned shares in reliance upon the fraud, which is believed to be the first ruling by a U.S. court sustaining such a theory under English common law.
  • He successfully argued against forum non conveniens dismissal, obtaining the first ruling after the Supreme Court’s decision in Morrison v. Nat’l Australia Bank Ltd., 130 S. Ct. 2869 (2010) to permit foreign investors pursuing foreign law claims to seek recovery for losses on a foreign stock exchange in a U.S. court.
  • He successfully argued that the Securities Litigation Uniform Standards Act of 1998 (SLUSA), which extinguishes U.S. state law claims in deference to the U.S. federal securities laws, should not be extended to foreign common law claims being pursued by both domestic and foreign investors.
  • He successfully argued that the pendency of a class action extends tolling under American Pipe & Construction Co. v. Utah, 414 U.S. 538 (1974) to both the statute of limitation and the statute of repose applicable to the Securities Exchange Act of 1934. 

Mr. Tuccillo also fulfills Pomerantz’s roles as MDL 2185 Individual Action Plaintiffs Steering Committee member and sole Liaison with BP and the Court.  The Firm’s BP clients include nearly three dozen public and private pension funds, investment management firms, limited partnerships, and investment trusts from the U.S., Canada, the U.K., France, the Netherlands, and Australia, seeking recovery for losses in BP’s common stock (traded on the London Stock Exchange) and American Depository Shares (traded on the NYSE). 

As the Firm’s lead litigator in In re KaloBios Pharmaceuticals, Inc. Securities Litigation, No. 15-cv-05841 (N.D. Cal.), Mr. Tuccillo negotiated a partial class-wide settlement for a cash/stock fund worth roughly $3 million from a bankrupt pharmaceutical company and its insurance carriers, while retaining the right to continue litigation against its former CEO.  The settlement was approved by the bankruptcy court and preliminarily approved by the district court. 

Mr. Tuccillo was the Firm’s lead litigation lawyer in In re Silvercorp Metals, Inc. Secs. Litig., No. 1:12-cv-09456 (S.D.N.Y.), a securities class action involving a Canadian company with mining operations in China and stock traded on the NYSE.  He worked closely with mining, accounting, damages, and market efficiency experts to defeat a motion to dismiss and oversee discovery.  After two mediations, the case was resolved for a $14 million all-cash fund.  In granting final approval of the settlement, Judge Rakoff noted that the case was “unusually complex,” given the technical nature of mining metrics, the need to compare mining standards in Canada, China, and the U.S., and the volume of Chinese-language evidence requiring translation. 

Mr. Tuccillo’s prior casework also includes litigation and resolution of complex disputes over roll ups of consulting companies and of commercial real estate interests. At Pomerantz, he was on the multi-firm team that litigated and settled In re Empire State Realty Trust, Inc. Investor Litig., No. 650607/2012 (N.Y. Sup. Ct.), representing investors in public and private commercial real estate interests against the long-term lessees/operators, the Malkin family and the Estate of Leona Helmsley, regarding a proposed consolidation, REIT formation, and IPO centered around New York’s iconic Empire State Building.  These efforts achieved broad relief for the class, including a $55 million cash/securities settlement fund, a restructured deal creating a tax benefit estimated at $100 million, expansive remedial disclosures, and important deal protections.

Mr. Tuccillo regularly counsels Pomerantz’s and his own institutional investor clients, both foreign and domestic, regarding pending or contemplated complex litigation in the United States.  He has extensive experience collaboratively working with outside investment management firms retained by Pomerantz’s clients to uncover evidence supporting securities claims.  His investigative skills enable Mr. Tuccillo to identify potential securities frauds early, regularly providing Pomerantz and its clients with the first opportunity to evaluate and pursue.  When litigation is filed, he oversees its conduct and regularly counsels these clients throughout.  These skills have enabled him to sign numerous institutional clients for litigation and portfolio monitoring services, including public and private pension plans, investment management firms and sponsored investment vehicles, from both the U.S. and abroad. 

Before joining Pomerantz, Mr. Tuccillo began his career at a large full-service Boston firm, litigating primarily for corporate clients. He also worked at plaintiff-side firms in Boston and Connecticut, litigating securities, consumer, and wage and hour class actions, as well as complex sale of business disputes. He has helped negotiate numerous multi-million dollar settlements, at times through the use of alternative dispute resolution.  His pro bono work includes securing Social Security benefits for a veteran suffering from non-service-related disabilities. 

Mr. Tuccillo graduated from the Georgetown University Law Center in 1999, where he made the Dean’s List. He competed on and later coached Georgetown’s award-winning team in the Philip C. Jessup International Law Moot Court Competition, was Foreign Publications Editor of the Georgetown International Environmental Law Review, and participated in Georgetown’s top-ranked clinical program, representing the Mattaponi Tribe in its fight to block a Virginia dam project on ancestral burial grounds. 

Prior to that, he was a 1995 graduate of Wesleyan University.  As an alumnus, he has devoted considerable time to Wesleyan’s pre-law programs, co-authoring and periodically updating its pre-law student guidebook and serving on numerous panels.  He currently serves as President of the Wesleyan Lawyers Association, after previously serving terms as Secretary, Executive Board member, and Steering Committee member. 

Mr. Tuccillo takes great pride in representing union clients.  He got his own union card as a teenager (United Food & Commercial Workers International Union, Local 371), following in the footsteps of his grandfather (International Brotherhood of Teamsters, Local 560).