FacultyFaculty/Author Profile

Clare O'Brien

Shearman & Sterling LLP

New York, NY, USA

Clare O’Brien regularly advises major US and international clients on their public and private mergers and acquisition transactions, including public company restructurings, joint ventures and large public transactions.  She also provides counsel on corporate law questions, including corporate governance matters.

Ms. O’Brien has been consistently acknowledged as a leading M&A lawyer and has received a “Dealmaker of the Year” award by The American Lawyer.

Prior to joining Shearman & Sterling, Ms. O’Brien worked with the law firm of Brady & Tarpey, P.C., where her practice included cross-border corporate transactions, litigation and domestic relations.  She began her legal career at the Irish law firm of Eugene F. Collins & Son.


  • Boston Scientific Corporation in its pending acquisition ofthe men’s health and prostate health businessesof Endo International plc for up to $1.65 billion, the sale of its neurovascular business to Stryker Corporation, the restructuring of its interests in Advanced Bionics Corporation, its acquisition of Guidant Corporation, the sale of Guidant's vascular businesses to Abbott Laboratories and in various corporate and other transactional matters
  • Heidelberg Cement AG,in its recently completed sale of its building products business in North America (excluding Western Canada) and the United Kingdom to an affiliate of Lone Star Funds for a purchaseprice of up to $1.4 billion, $1.3 billion of which was paid at closing.
  • Mubadala Development Company, a public joint stock company wholly owned by the Government of the Emirate of Abu Dhabi, in connection with various matters, including its global business partnership with General Electric Company, its $2 billion investment in the EBX Group (and related restructuring transactions) and its 2014 investment with Trafigura Pte. Ltd. in MMX Porte Sudeste
  • Lafarge SA in various transactions, including the 2013 sale of its North American Gypsum business to an affiliate of Lone Star Funds, and the 2014 sale of certain aggregate and ready mix concrete assets to Bluegrass Materials Company, LLC, an affiliate of Lindsay Goldberg III, LP
  • Ardagh Group S.A. in connection with its 2014 sale of Anchor Glass Container Corporation to an affiliate of KPS Capital Partners LP
  • Corning Incorporated in various corporate and transactional matters, including its acquisitions of Axygen BioScience, Inc. and the Discovery Labware business of Becton, Dickinson and Company
  • Bunge Limited in connection with various matters, including the sale of its Brazilian fertilizer business to Yara International ASA, its 2010 sale of Brazilian Fertilizer Nutrients Assets to Vale S.A., its 2010 acquisition of Usina Moema Participações S.A. and its terminated merger agreement with Corn Products International, Inc.
  • Danone in various matters, including its acquisitions of The YoCrunch Company, YoCream International, Inc., and Medical Nutrition USA, Inc. and transactions with an affiliate of Kelso & Company, Suntory Water Group, The Coca-Cola Company, and Stonyfield Farm, Inc.
  • SunGard Data Systems, Inc. in its $11.3 billion acquisition by seven private equity funds led by Silver Lake Partners, the sale of its Higher Education businesses in 2012 to affiliates of Hellman & Friedman LLC for an aggregate cash purchase price of $1,775 billion, andits 2014 split-off of SunGard Availability Services Inc
  • nP.H. Glatfelter Company in various matters, including its acquisition through its wholly owned subsidiary, Glatfelter Canada Inc., of outstanding shares of Concert Industries Corp. from Brookfield Special Situations Management Limited
  • HeartWare International, Inc. in various matters, including its terminated acquisition transaction with Thoratec Corporation
  • Fujifilm Holdings Corporation (Fujifilm) in connection with its $995 million acquisition of SonoSite, Inc.
  • Quest Diagnostics Incorporated in various corporate and transactional matters, including its 2014 acquisition of Spectrum Laboratories Holdings, Inc, a portfolio company of Welsh, Carson, Anderson & Stowe, its 2011 acquisitions of Athena Diagnostics, Inc. and Celera Corporation and its acquisitions of AmeriPath Corporation, Unilab Corporation and the clinical laboratory business of SmithKline Beecham Corporation
  • The Special Committee of HCA Inc. in connection with the $33 billion acquisition of HCA by three private equity funds


    Incorporated Law Society of Ireland (Irish Roll of Solicitors) (1985)

    Trinity College (Dublin), B.A. Legal Science (1982)

    Bar Admissions/Qualifications

    New York, Ireland

    Professional Affiliations and Business Activities

  • Board of Directors, American Association of the International Commission of Jurists
  • Board of Directors of The French American Foundation

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