Katherine Maco is a senior associate in the New York office and a member of the Securities Litigation, Investigations and Enforcement Group. Her practice focuses on accountants’ liability, securities and commercial litigation, regulatory investigations and international commercial arbitration.

Katherine has represented clients in federal appeals court, federal district courts, and state court, in international arbitrations held under the auspices of the International Centre for Dispute Resolution at the American Arbitration Association as well as non-administered arbitrations conducted under UNCITRAL and other rules, in trans-national investigations conducted by the SEC, in internal corporate investigations, and as amicus curiae before the Supreme Court of the United States.

Katherine has represented a variety of foreign members of the Big Four accounting firms in both commercial litigation and regulatory investigations.

Katherine also has experience conducting internal corporate investigations of whistleblower claims, and has represented clients in various commercial actions, including the successful defense of a chemical supplier against claims brought by its distributer and the representation of a client arising out of a deal in the municipal bond market.

  • Katherine’s representative engagements include the following:

    • The successful defense of foreign member firms in two federal suits arising out of the firms’ audits of a group of companies that invested largely in a $3 billion Ponzi scheme. Katherine also represented the foreign member firms in a related SEC investigation of the firms’ client.
    • The successful defense of a foreign member firm in litigation arising out of the collapse of hedge funds controlled by the Bear Stearns companies.
    • The successful defense in federal district court of a foreign member firm in litigation arising out of the firm’s involvement in the audits of certain feeder funds that invested in Bernard Madoff securities.
    • The representation of several foreign member firms in multi-national regulatory investigations of the firms’ clients. In these investigations, Katherine has worked closely with both the domestic and foreign regulators on cross-border and trans-national issues related to regulatory enforcement.


    Katherine’s practice also focuses on international commercial arbitration and related federal litigation. Katherine’s representative engagements include the following:

    • The successful representation of a U.S. investment fund in a dispute with its Indian partner arising out of the parties’ investment in an Indian securities business before the International Centre for Dispute Resolution. Katherine also successfully represented the client in its related suits for several anti-suit injunctions in aid of arbitration as well as litigation to confirm and enforce the arbitral award in favor of her client, and is advising Indian counsel in Indian proceedings related to defending and enforcing the arbitral award.
    • The representation of a major European telecommunications conglomerate in connection with cross-border disputes arising out of various shareholder agreements, including an UNCITRAL arbitration and federal litigation.
    • The representation of a U.S. investor in an ad hoc proceeding against the Commonwealth of Dominica arising out of the expropriation of the local electric utility.

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