Katherine Stoller
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Katherine Stoller

Partner

Katherine is U.S. Head of Investigations and White-Collar. 

Katherine advises global companies, boards, and senior executives on complex regulatory and enforcement matters, governance and compliance issues, and civil litigation.  She focuses on matters involving allegations of money laundering, AML/BSA violations, economic sanctions violations, securities fraud, bank fraud, corruption, and other significant institutional risks. She has represented global banks and leading businesses in resolving multifaceted cross-border investigations that present uniquely challenging legal and operational issues.

Widely recognized as a leading white-collar and investigations lawyer, Katherine has been named a White Collar MVP by Law360 and recognized as North America Litigator of the Year by Women in Business Law. Global Investigations Review has nominated her as Investigations Professional of the Year. Chambers USA recognizes her in Financial Services Regulation: Banking (Enforcement & Investigations) and White-Collar Crime & Government Investigations.

Katherine represents companies and individuals in matters involving the U.S. Department of Justice, the SEC, the FRB, the OCC, NYDFS, the CFTC, OFAC, and FinCEN. Katherine also advises clients in the financial services, digital assets, and technology industries on a broad range of governance and compliance matters, with particular experience helping institutions navigate periods of heightened scrutiny and change. 

Katherine has deep experience defending civil securities fraud claims and represents clients in a wide range of complex commercial disputes, particularly in cross-border litigation and proceedings connected to compliance, governance, and other high-stakes institutional matters.

Expertise

Industries

Experience

Representative matters

White-collar criminal defense, regulatory enforcement and internal investigations
  • Danske Bank in investigations by DOJ, the SEC, and Danish criminal authorities arising from money laundering allegations involving its former Estonian branch, resulting in a USD2 billion global settlement. This settlement was nominated for Most Important Development of the Year at the Global Investigations Review 2023 awards.
  • Counsel to DOJ’s Independent Monitor of A global cryptocurrency exchange, the global cryptocurrency exchange, in connection with its USD4.3bn BSA/AML and sanctions resolution with DOJ. This settlement was nominated for Most Important Development of the Year at the Global Investigations Review 2024 awards.
  • KuCoin Crypto Exchange in connection with charges by DOJ and the CFTC that one of the world’s largest exchanges operated in the US without appropriate registrations or a compliant BSA/AML program. 
  • Deutsche Bank in the investigation and resolutions with the New York State Department of Financial Services and the Federal Reserve relating to anti-money laundering compliance in its Moscow office.
  • UniCredit in connection with compliance obligations arising from its settlements with DOJ, the District Attorney of New York County, the Federal Reserve, OFAC and the New York State Department of Financial Services, following global resolution of U.S. economic sanctions charges.
  • Wachovia Bank in the investigation and resolution with DOJ, FinCEN, and the OCC related to anti-money laundering compliance in Wachovia’s correspondent banking business.
  • Fiat Chrysler Automobiles N.V. and FCA US LLC in resolving an SEC investigation of sales reporting practices.
  • Numerous financial institutions and companies in cross-border investigations relating to money laundering, BSA/AML compliance, and sanctions violations, including in connection with Russia, the Baltics, the Middle East, and Latin America.
  • Major financial institution in multiple internal investigations related to control failures and regulatory interactions.
  • Numerous companies and financial institutions in internal investigations involving whistleblower and workplace misconduct allegations, including sexual harassment, hostile workplace environment, and discrimination.
  • Technology company, in an internal investigation into sexual harassment and hostile workplace environment allegations.
  • Consumer-facing tech company in a DOJ fraud investigation, resulting in a declination.
  • Global investment bank in connection with SEC and FINRA inquiries into underwriting practices.
  • Global financial institution in connection with a price-fixing investigation.
  • A company and its CEO in connection with an insider trading investigation. Secured a declination from the SEC.
  • Global financial services firm in a False Claims Act investigation in which the government declined to intervene.
Securities and complex commercial litigation
  • A major global bank against claims it aided and abetted an alleged Ponzi scheme.
  • A major global bank in connection with lawsuit asserting claims under foreign law for environmental damages allegedly caused by mining company.
  • Nomura Holding America Inc. in a securities action brought by the Federal Housing Finance Agency concerning Freddie’s and Fannie’s purchase of RMBS before the financial crisis. Defended Nomura in four-week bench trial in the U.S. District Court for the Southern District of New York, in one of the only financial crisis securities litigations to go to trial.
  • Philips in a successful bench trial before the Delaware Court of Chancery involving contractual, fraud and corporate law claims by an Italian investor under the laws of Italy, the Netherlands and Delaware pertaining to a EUR200 million loan to a third-party company.
  • A global financial institution in a series of litigations brought by various companies alleging that they manipulated the market for those companies’ stocks by intentionally failing to deliver shares sufficient to settle short positions entered into by the defendants’ clients.
  • Porsche in obtaining the dismissal of federal securities claims (affirmed by the U.S. Court of Appeals for the Second Circuit) seeking more than USD2.5bn arising out of its takeover bid for Volkswagen; also represented the client in obtaining the dismissal, on appeal, of parallel claims brought in New York State Court.
  • A prominent family office, in litigation arising out of a Ponzi scheme.

Published Work

  • Author, “10 Questions to Ask About Incentives and Clawbacks,” Corporate Compliance Insights, 2024
  • Author, “Unpacking the New Russia Sanctions and Export Controls,” Law360, 2024
  • Author, “Witness Interviews in Internal Investigations: The US Perspective,” Global Investigations Review, 2022 - 2023
  • Author, “Latest Ripple Development Highlights SEC’s Crypto Approach,” Law360, 2022
  • Author, “Navigating the regulatory web of Russia sanctions,” The Banker, 2022
  • Author, “Conducting Internal Investigations: Avoiding Common Legal Pitfalls,” PLI Chronicle, 2021 

Speaking Engagements

  • Panelist, “AML Implementation, New FinCEN Executive Orders,” Managed Funds Association, MFA Workshop. July 2025
  • Panelist, “Anti-Money Laundering Compliance & Investigations,” Nardello & Co. Risk Advisory & Compliance Summit, October 2022
  • Panelist, “Navigating the Russian Sanctions Regime,” LexisNexis, March 2022
  • Panelist, “The U.S. Anti-Money Laundering Act of 2020: Strengthening AML Enforcement Abroad While Closing Loopholes at Home,” Bahamas Financial Services Board, June 2021
  • Panelist, “The Outlook for Russia,” Trade Association for the Emerging Markets, May 2021
  • Panelist, “Best Practices in Internal Investigations – The Legal Perspective for CFEs,” Practising Law Institute, April 2021
  • Panelist, “Sanctions Regime: Implementing OFAC Requirements and Magnitsky Legislation,” LexisNexis, March 2021
  • Panelist, “Update on Emerging Markets Sanctions,” Trade Association for the Emerging Markets, March 2021
  • Panelist, “Global Reach: Recent Developments in Cross-Border Investigations of Financial Institutions,” Practising Law Institute, April 2020
  • Panelist, “AML and OFAC/Sanctions Enforcement Update,” Financial Crimes Enforcement, Compliance & Risk Mitigation Conference, February 2020 

Leadership Positions And Professional Affiliations

  • Trustee, Practising Law Institute

Recognition

She brings incredible expertise, manages huge matters and is very good and strong.
Chambers USA, 2023
Katherine is a master at handling contentious situations with poise and sharp intellect.
Chambers USA, 2025

Awards

  • White Collar MVP, Law360
  • North America Litigator of the Year, Women in Business Law 
  • Investigations Professional of the Year nominee, Global Investigations Review
  • Recognized in Chambers USA, Financial Services Regulation: Banking (Enforcement and Investigations); White-Collar Crime and Government Investigations
  • Litigation Star, Benchmark Litigation
  • Listed in Global Investigations Review, Women in Investigations survey
  • Named a Notable Woman in Law, Crain’s New York Business 
  • White-Collar Crime Lawyer of the Year nominee, Women in Business Law
  • Recognized by The Legal 500 in International Litigation; Financial Services, Litigation; and Corporate Investigations and White-Collar Criminal Defense 

Qualifications

Admissions

Attorney-at Law, State of New York, US, 2007

Courts

United States Court of Appeals for the Second Circuit, 2018

United States District Court for the Eastern District of New York, 2018

United States Court of Appeals for the District of Columbia Circuit, 2019

United States District Court for the Southern District of New York, 2007

Academic

BA, magna cum laude, Phi Beta Kappa, Yale College, 2002

JD, Harlan Fiske Stone Scholar, Columbia Law School, 2006

Disclaimer
A&O Shearman was formed on May 1, 2024 by the combination of Shearman & Sterling LLP and Allen & Overy LLP and their respective affiliates (the legacy firms). Any matters referred to above may include matters undertaken by one or more of the legacy firms rather than A&O Shearman.