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William (Bill) M. Regan

New York

William (Bill) M. Regan

Bill Regan understands that success in modern litigation means obtaining early-stage resolutions that save the client the substantial burden, expense, and distraction of protracted litigation. To achieve this goal, Bill begins each case by working closely with the client to marshal the critical facts and efficiently and compellingly present the client's legal position to the court or regulator as early as possible. This intensive "up-front" approach to litigation regularly results in pleading-stage dismissals and terminated regulatory investigations.

Bill is a partner in Hogan Lovells’ global Financial Services Litigation Practice Group. He has more than 16 years of experiencing representing financial institutions in both civil litigations and regulatory enforcement actions. Recently, Bill has represented some of the world’s largest international financial services firms in U.S. legal proceedings concerning repurchase agreements, RMBS valuations, hedge-fund linked derivatives, futures, commercial credit facilities, trading accounts, and real estate and construction loans.

In addition to his work for financial services firms, Bill is a member of Hogan Lovells’ corporate and shareholder litigation subgroup. At both the trial court and appellate levels, Bill has extensive experience in all types of securities litigation matters, including class actions under the Securities Exchange Act of 1934 and the Securities Act of 1933, stockholder derivative suits, SEC investigations, internal and special committee investigations, and M&A and corporate governance disputes. These matters have involved investors or whistleblowers alleging, among other things, accounting improprieties, overly optimistic earnings forecasts, false representations concerning the likelihood of FDA approval, and failure to disclose risks associated with newly developed technologies.

Bill has been recognized as a leading securities litigator by The Legal 500 United States from 2013-2015.

Representative Experience

Representing international investment bank in a litigation concerning repo liquidations and RMBS valuation during the financial crisis.

Represented international investment bank in multiple litigations concerning hedge-fund linked derivatives.

Obtained dismissal of derivative action against a financial institution alleging breach of fiduciary duty and improper liquidation of loan collateral.

Represented commercial bank and senior executives in SEC investigation of timely recognition of loan losses during the financial crisis.

Represented international software firm in SEC investigation concerning accounting misconduct identified by corporate whistleblower.

Obtained dismissal of SDNY securities class action against officers and directors of clean energy company.

Obtained dismissal of DNJ securities class action against pharmaceutical firm following FDA rejection of new drug application.

Represented issuer in SDNY securities class action filed after executive turnover, failure to file SEC reports, and resignation by independent auditor.

Education and admissions


  • B.A., magna cum laude, Hofstra University
  • J.D., with honors, The George Washington University Law School

Bar admissions and qualifications

  • New York

Court admissions

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