A. William Caporizzo


  • Vice Chair, Transactional Department

Bill Caporizzo is a leading lawyer and certified public accountant who helps both private and public companies navigate the complex tax issues they often face. For more than 30 years, Mr. Caporizzo has been regularly called upon to represent clients on the tax implications of domestic and cross-border corporate mergers, acquisitions and dispositions, as well as international restructurings. He also focuses on all tax issues related to early-stage companies, including equity compensation issues, and structuring financing transactions and mergers and acquisitions for efficient tax results. In addition, he has extensive experience with the taxation of partnerships and limited liability companies engaged in investment and real estate activities. Learn more about Mr. Caporizzo's practice and how he can support your startup on

Mr. Caporizzo has presented at seminars on taxation for the NASDAQ, National Association of Stock Plan Professionals, and Massachusetts Continuing Legal Education Program. He is a member of the Tax Sections of the American and Massachusetts Bar Associations and the Boston Bar Association.

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    September 12, 2018
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    Nine WilmerHale partners were named 2019 Lawyers of the Year by Best Lawyers in America®, with the peer-review publication recognizing 114 lawyers from the firm overall.

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  • WilmerHale Counsels Vail Resorts in Acquisition of Four Mountain Resorts in Two Transactions

    Vail Resorts, Inc., a leading global mountain resort operator, announced on June 4, 2018, that it has entered into an agreement to purchase four mountain resorts.

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  • Represented Credit Suisse Securities and BMO Capital Markets Corp. on tax matters related to its Entasis IPO.
  • Advised WeWork Companies Inc. on various tax matters in connection with its acquisition of Teem Technologies.
  • Counseled TMC Bonds in the acquisition by Intercontinental Exchange.
  • Represented Vail Reports in its acquisition of four mountain resorts in two separate transactions.
  • Advised DriveWealth in its $21M Series B Funding.
  • Served as legal counsel in connection with the creation of Valence Media, a new diversified media company formed through the combination of three successful media companies.
  • Represented Westmount Asset Management on the sale of Rosemont Investment Partners’ stake to Temperance Partners.
  • Counseled WorkMarket in its acquisition by ADP.
  • Advised HS2 Solutions in its acquisition of LunaMetrics.


  • Award Text

    Leading Tax Lawyer

    Chambers USA


  • Award Text

    Best Lawyer in America for Tax Law

    Best Lawyers in America®


  • Award Text

    Recommended for Tax: US Taxes Non-Contentious

    The Legal 500 United States


  • Recognized as a Massachusetts leader in the practice area of tax in the 2007–2023 editions of Chambers USA: Guide, with sources saying he is "really helpful in guiding the business people to understand the issues and to come up with solutions" and that "his advice is always tailored to the needs of the client." He has also been previously recognized in the area of employee benefits.
  • Selected by peers for inclusion in the 2013–2024 editions of Best Lawyers in America for his tax law practice.
  • Named to Boston Magazine’s Top Lawyers list in the area of tax law (20212023).
  • Recommended in the 2016–2019 editions of the The Legal 500 United States in the area of Tax: US Taxes Non-Contentious.
  • Named a "New England Super Lawyer" (formerly "Massachusetts Super Lawyer") in tax law in the 2004–2012 issues of Boston Magazine.

Insights & News


  • Education

    • JD, Boston University School of Law, 1985

      magna cum laude
    • BS, University of Pennsylvania, 1982

      magna cum laude
  • Admissions

    • Massachusetts

    • Connecticut



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