Caporizzo_William

A. William Caporizzo

Partner

  • Vice Chair, Transactional Department

Bill Caporizzo is a leading lawyer and CPA who helps both private and public companies navigate the complex tax issues they often face. For more than 35 years, Mr. Caporizzo has been regularly called upon to represent clients on the tax implications of domestic and cross-border corporate mergers, spin-offs, acquisitions and dispositions, partnerships and joint ventures, and restructurings. He also advises corporate clients on capital market transactions, venture financings and fund formations.

Bill advises on tax related matters for myriad of industries, including technology, life sciences, financial services, private equity and manufacturing, among others.  

  • Thermo Fisher Enters into Definitive Agreement to Acquire Solventum’s Purification and Filtration Business

    On February 25, 2025, Thermo Fisher Scientific Inc., the world leader in serving science, announced its definitive agreement to acquire Solventum’s purification and filtration business for approximately $4.1 billion. 

    February 25, 2025
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  • WilmerHale Lawyers Named Among the 2025 Best Lawyers in America®, Seven Recognized as Lawyers of the Year

    Best Lawyers in America® has named seven WilmerHale partners as 2025 Lawyers of the Year, with the peer-review publication recognizing 121 attorneys from the firm overall.

    August 15, 2024
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  • Herb Chambers Companies to be Acquired by Asbury Automotive Group for $1.34B

    On February 18, 2025, Asbury Automotive Group, Inc. (NYSE: ABG), one of the largest automotive retail and service companies in the US, signed a definitive agreement to acquire various automotive dealerships owned by The Herb Chambers Companies (HCC), the fourteenth largest by revenue privately-owned dealership group in the country.

    February 21, 2025
    Read More

Experience

    • Represented Akamai Technologies in its acquisition of Noname Security.
    • Represented CH Investment Partners in its sale to Cresset Asset Management.
    • Represented Circle Internet Group, Inc. in its acquisition of Hashnote Holdings LLC.
    • Represented Flo Health in its $200 million Series C financing.
    • Represented Herb Chambers Companies in its definitive agreement to be acquired by Asbury Automotive Group.
    • Represented Instinet in the sale of its Fox River algorithmic trading business to Clear Street.
    • Represented Navient Corporation in the sale of its Government Services business to an affiliate of Gallant Capital Partners, LLC.
    • Represented Navient Corporation in the sale of its Xtend Healthcare business to CorroHealth.
    • Represented Nordstrom family in connection with its going private transaction with Nordstrom, Inc. (NYSE) for $6.25 billion and related corporate governance matters.
    • Represented Orna Therapeutics in its acquisition of ReNAgade Therapeutics.
    • Represented Spectric plc in its acquisition of Micromeritics Instrument Corporation.
    • Represented The Penn Mutual Life Insurance Company in its agreement to sell Janney Montgomery Scott LLC to KKR.
    • Represented Thermo Fisher Scientific Inc. in its definitive agreement to acquire Solventum’s purification and filtration business for approximately $4.1 billion.
    • Represented TMX VettaFi in its acquisition of Credit Suisse’s Bond Indices from UBS.

Recognition

  • Award Text

    Leading Tax Lawyer

    Chambers USA

    2007–2025

  • Award Text

    Best Lawyer in America for Tax Law

    Best Lawyers in America®

    2013–2025

  • Award Text

    Leading Global Tax Lawyer

    Lawdragon

    2025

  • Named to the 2025 Lawdragon 500 Leading Global Tax Lawyers list.
  • Recognized as a Massachusetts leader in the practice area of tax in the 2007–2025 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 2013–2025 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 (20212024).
  • 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

Credentials

  • Education

    • JD, Boston University School of Law, 1985

      magna cum laude
    • BS, University of Pennsylvania, 1982

      magna cum laude
  • Admissions

    • Massachusetts

    • Connecticut

Credentials

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