Bar Admissions

  • New York

Court Admissions

  • U.S. Court of Appeals for the Second Circuit
  • U.S. Court of Appeals for the First Circuit
  • U.S. District Court for the Southern District of New York
  • U.S. District Court for the Eastern District of New York


  • J.D., cum laude, University of Pennsylvania Law School, 1999
    Moot Court Board, Co-Chair

    University of Pennsylvania Law Review, Articles Editor
  • B.B.A., High Distinction, University of Michigan, 1996

Judicial Clerkships

  • Honorable Shirley Wohl Kram, U.S. District Court for the Southern District of New York, 1999 - 2001


  • Federal Bar Council

    Hellenic Lawyers Association of New York

    International Bar Association

    New York City Bar Association (Secretary, Government Ethics Committee, 2008-2011)
T +1 212.370.6272
F +1 212.307.5598

Kostas D. Katsiris


Kostas Katsiris is an accomplished litigator and a powerful advocate for his clients. For nearly two decades, he has represented plaintiffs and defendants in complex disputes in federal and state courts in New York and throughout the United States, and in private mediations and arbitrations. He has extensive experience working with clients in a number of industries, including financial services, real estate, media and entertainment, retailing, construction, hospitality, and hotel management. Kostas also has substantial experience conducting confidential internal investigations relating to sensitive legal issues.

Kostas brings to his work a level of energy and dedication that has been recognized by his peers, his clients, and judges. He has the distinction of having served as a federal court-appointed Special Master in a complex consumer fraud class action. He encourages prospective clients to speak to his prior and current clients and will provide references upon request.

Representative Matters

Financial Services Industry: Kostas represents banks, investment advisors, hedge funds, private equity firms, broker-dealers, and their officers and directors in civil litigation, including:

  • Securities actions brought under federal and state securities laws. Kostas has been involved in some of the largest securities fraud class actions on record and has successfully defeated class certification and narrowed class claims through motion practice.
  • Stockholder class actions arising out of merger agreements.
  • SEC and FINRA matters, including internal investigations concerning reporting obligations and conduct.
  • Breach of contract disputes and business torts, including claims of tortious interference. Kostas has won dismissal of suits alleging in excess of $50 million in damages.
  • Plaintiff's-side matters. Kostas has recovered millions of dollars for his clients and has helped them restructure business and contractual arrangements to their satisfaction.

Real Estate, Hotel Management and Construction: Kostas represents real estate developers, landlords, and commercial tenants in breach of contract and business tort cases. He also represents hotel management companies in disputes concerning their management and franchise agreements, and special servicers in the CMBS industry. His litigation experience includes:
  • Defeating negligence and nuisance claims against the nation's largest deconstruction and abatement company. The claims related to the reconstruction of the World Trade Center area in Lower Manhattan. In that case, Kostas's client was the only defendant among ten similarly situated defendants to assert a legal theory that ultimately resulted in the dismissal of all claims against it (the defense was later adopted by other parties).
  • Dismissing claims of fraud brought by a prominent New York City-based landlord against an international developer of surgical centers. The plaintiff alleged that it was fraudulently induced to develop a commercial premises for use as a medical center and had claimed over $25 million in damages.
  • Representing a global hotel management company in litigation brought by the owner of a prominent Miami Beach hotel. One of the issues in the litigation concerns the hotel owner's failed attempt to oust the manager from the hotel in a surprise midnight raid, while the lawsuit was pending.
  • Successfully defending a real estate developer's ability to complete the renovation of a building in Manhattan and defeating claims of injunctive relief brought by an adjacent landowner.
  • Representing the senior lender and various junior lenders in connection with inter-creditor disputes arising out of the multi-billion-dollar financing of Peter Cooper Village and Stuyvesant Town.  

Bankruptcy-Related Disputes: Kostas litigates disputes in the bankruptcy context for creditors, debtors, and other parties in interest. This experience includes:
  • Representing a prominent private equity firm in litigation arising out of the bankruptcy of one of its portfolio companies, a well-known mortgage lender. This matter involved bankruptcy-related claims asserted by an unsecured creditor's committee, as well as securities-related tort claims asserted by sophisticated hedge fund creditors.
  • Representing a leading global investment bank and underwriter of asset-backed securities in an adversary proceeding brought by a litigation trustee in federal bankruptcy court.
  • Representing an investment adviser and its affiliates in Chapter 15 proceedings related to an application by debtors for recognition of restructuring proceedings in the Cayman Islands.
  • Representing clients in connection with their responses to expedited discovery requests pursuant to Rule 2004.

Class Actions: Kostas has worked on various consumer, shareholder, and privacy-related class action matters throughout his career. This experience includes:
  • Obtaining an order denying lead plaintiffs' motion for class certification in a putative shareholder class action. The order was based on testimony elicited by Kostas during the depositions of lead plaintiffs.
  • Representing a Big Four audit firm in various state court actions and in consolidated federal securities and derivative actions related to alleged misconduct by officers of the international manufacturing company Tyco. The multi-district litigation proceedings in this case remain among the largest on record.
  • Representing a global retailer in privacy-related class actions filed in multiple jurisdictions that alleged the misuse of customer information.
  • Serving as a federal court-appointed Special Master in a complex consumer fraud class action involving hidden images in a well-known video game. In this role, Kostas oversaw the notice and claims administration procedures in the case. 


Kostas is a member of the Federal Bar Council, the Hellenic Lawyers Association, the International Bar Association, and the New York City Bar Association. He has served as a mentor to young adults and teenagers through the Year Up and Citizen Schools programs. He is a member of Venable's nationwide Expansion Committee, which is charged with furthering the strategic growth of the firm.