LAWYER PROFILE
William Regan

William Regan

USA 2026

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Ranked in 1 practice area

About

Provided by Hogan Lovells Cadwalader

USA

Practice Areas

Bill Regan understands that success in litigation means obtaining early-stage resolutions that save clients the substantial burden, expense, and distraction of protracted legal disputes.

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 Cadwalader's Securities, Shareholder and M&A Litigation group. He has more than 20 years of experience representing public and private companies in all types of securities litigation matters, including class actions under the Securities Act of 1933 and the Securities Exchange Act of 1934, stockholder derivative suits, SEC and FINRA investigations, internal and special committee investigations, and M&A and corporate governance disputes. Bill's securities litigation matters have involved corporate culture and #metoo allegations, accounting improprieties, missed earnings forecasts, regulatory violations, and representations concerning FDA approval of new drug applications. In the M&A space, Bill has represented clients in cases concerning false statements in proxy and tender offer disclosures, indemnification in connection with representation and warranty breaches, earn-out disputes, purchase price adjustments, and material adverse change issues.

In addition to his work for public and private issuers, Bill regularly represents financial institutions on securities-related matters. Recently, Bill has represented some of the world's largest international financial services firms in U.S. legal proceedings concerning repurchase agreements, CMBS, RMBS, hedge-fund linked derivatives, futures, commercial credit facilities, trading accounts, and real estate and construction loans.

Chambers Review

Provided by Chambers

Chambers Guide to the USA

Litigation: Securities - New York

Band 4
Band 4

Individual Editorial
William Regan is a go-to litigator for financial institutions facing securities class and derivative suits involving a range of issues.

Strengths

Provided by Chambers

  • William is fantastic. He is extremely knowledgeable in the securities area and a subject matter expert. He is excellent with board members and is lovely to work with.

    Litigation: SecuritiesChambers Guide to the USA
  • William is excellent in terms of his knowledge, work ethic, preparation and communication skills. He has an ability to look ahead and plan accordingly, along with business sense.

    Litigation: SecuritiesChambers Guide to the USA
  • William is great on nuanced litigation issues.

    Litigation: SecuritiesChambers Guide to the USA

Ranked Individuals at Hogan Lovells Cadwalader (262)

California

California: San Francisco, Silicon Valley & Surrou

California: Southern

Colorado

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