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Gandolfo V. DiBlasi

Of Counsel

Gandolfo V. DiBlasi

Of Counsel
New York +1-212-558-3836+1-212-558-3836 +1-212-558-3588+1-212-558-3588

Vince DiBlasi is a member of Sullivan & Cromwell’s Litigation Group. After joining the Firm in 1978, he built a global reputation representing clients in several of the largest financial services industry cases of the past two decades.

Mr. DiBlasi has served as lead counsel to clients in major investigations, such as:

  • the insider trading and market manipulation cases of the late 1980s;
  • the government securities investigations arising from the Salomon Brothers Treasury auction scandal;
  • the pay-to-play investigations in the municipal securities market;
  • the Orange County litigation and investigation;
  • various Enron-related matters;
  • investigations into practices related to IPOs and research analysts;
  • investigations relating to market timing of mutual funds; and
  • representation of several clients in connection with litigation and investigations concerning allegedly “back dated” options.

Mr. DiBlasi is currently representing clients in litigation arising from mortgage-related securities, liquidity concerns and auction rate securities.

He has handled many investigations by the Securities and Exchange Commission and self-regulatory organizations such as the New York Stock Exchange, National Association of Securities Dealers and Chicago Board Options Exchange, including trials.

Mr. DiBlasi also regularly represents leading investment banking firms in connection with major legal developments affecting the investment banking industry.

He has earned many of the legal industry’s top rankings and is recognized as a leading authority on securities and commodities class actions and derivatives suits. He frequently is retained to consult with board committees and board members.

Professional Activities and Community Involvement

  • Director, The Legal Aid Society
  • Trustee, Federal Bar Foundation

Recent Recognitions

  • Chambers USA: America’s Leading Lawyers for Business – recognized as a leading litigator in Securities (2004-2016), White-Collar Crime & Government Investigations (2004) and General Commercial Litigation (2003-2004)
  • Chambers Global: The World’s Leading Lawyers for Business – recognized as a leading lawyer in General Commercial Litigation (2003)
  • The Legal 500 United States – recognized as a leading lawyer in Corporate Governance and SEC (2007), Financial Services Litigation (2012), Securities Shareholder Litigation (2007, 2009-2012) and SEC Investigation and Enforcement (2007)
  • The Best Lawyers in America – recognized as a leading lawyer in Bet-the-Company Litigation and White-Collar Criminal Defense (2006-2018), Corporate Governance and Compliance (2006-2011), Commercial Litigation (2007-2018), Corporate Law (2011-2018), Business Litigation (2005, 2006) and Litigation - Antitrust and Litigation - Securities (2012-2018)
  • The International Who’s Who of Commercial Litigation Lawyers – recognized for Commercial Litigation
  • The International Who’s Who of Business Lawyers – recognized for Commercial Litigation
  • Euromoney’s Benchmark: America’s Leading Litigation Firms and Attorneys – recognized as a star in Securities Litigation (National) (2008-2014), White-Collar Crime (National) (2008-2014) and Litigation (New York) (2008-2014)
  • Euromoney’s Guide to the World’s Leading White Collar Crime Lawyers – recognized for White-Collar Crime (2008)
  • Euromoney’s Guide to the Leading United States Litigation Lawyers – recognized for Litigation (2005)
  • Lawdragon – selected as one of “100 Lawyers You Need to Know in Securities Litigation” (2008)
  • Lawdragon – selected as one of the “500 Leading Lawyers in America” (2005-2010)
  • Lawdragon – selected as one of the “500 Leading Litigators in America” (2006)
  • New York Super Lawyers – selected as one of The Top 10 Lawyers in New York (2011) and as one of The Top 100 Lawyers in New York (2007-2013)
  • New York Super Lawyers – selected as a leading lawyer (2005-2017)


  • Represents more than a dozen major banks in litigation brought against a large bond insurer concerning a multi-billion dollar restructuring
  • Successfully represented an Audit Partner of a major accounting firm in an SEC Administrative Trial
  • Represents a major financial institution and serves as liaison counsel to 55 investment banks in the IPO allocation class actions, one of the most complex and long-running corporate and securities litigation matters ever. The litigation consists of 309 putative or certified class action suits that have been filed since early 2001, each relating to an initial public offering managed by one or more of the defendants during the “dot com” boom of the late 1990s. Mr. DiBlasi was selected for this role by his peers at other top law firms
  • Counsel to Oxford Health Plans in class action and derivative litigation arising out of the 1997 collapse of Oxford’s stock price
  • Represented David Duncan, former lead Arthur Andersen engagement partner for Enron. Following reversal of Arthur Andersen’s conviction, federal court granted motion to vacate Mr. Duncan’s guilty plea
  • Served as counsel to First Boston in connection with Orange County’s bankruptcy in a case brought by the SEC