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Ronan P. O'Sullivan

Partner, Corporate Department
T 44-020-3023-5127
F 44-020-3023-5427
Ronan O'Sullivan is the chair of the London office of Paul Hastings and vice chair of the global Corporate Department. Mr. O'Sullivan focuses his practice on mergers and acquisitions and corporate finance and has considerable experience in private and public takeover work, joint ventures and domestic and cross-border restructurings.


  • Jacobs Engineering Group Inc. on the acquisition of the patent rights for BAYQIK® quasi-isothermal sulfuric acid converter technology and other related technology from Bayer AG;
  • Filtration Group on the acquisition of the Porous Technologies business of UK-based industrial group Essentra plc. for £220 million;
  • Ares Management on a joint venture with Thor Equities to acquire the Benetton retail space in Paris;
  • City Football Group, the owner of football-related businesses including Manchester City FC, New York City FC, Melbourne City FC, and a minority shareholder in Yokohama F. Marinos, on its partnership with a consortium of high-profile Chinese institutional investors led by China Media Capital.  The agreement will see the consortium of China Media Capital and CITIC Capital invest US$400M in the City Football Group to take a shareholding of just over 13%, valuing City Football Group at US$3 billion;
  • Fosun Property, the Shanghai-based real estate investment management platform of Fosun International, the largest privately-owned conglomerate in China, on the acquisition of a majority stake in Resolution Property Investment Management, the London-based private equity real estate fund manager;
  • Moneygram on its acquisition of MTI Money Transfer Limited;
  • Jacobs Engineering Group Inc. on a number of transactions including its US$913 million acquisition of the Process and Construction business from Oslo-listed Aker Solutions ASA and in connection with its $1.3 billion acquisition of SKM.

Accolades and Recognitions

  • Chambers UK, 2017
    Ronan O'Sullivan of Paul Hastings (Europe) LLP “knows our business really well; he can apply the law to the business in a practical way,” notes a client. He is a well-regarded name in the field and has recently advised clients in the sports, shipping and private equity areas.
  • Chambers UK, 2016
    The "extremely knowledgeable and very deal-oriented" Ronan O'Sullivan heads the corporate practice at Paul Hastings (Europe) LLP. Clients appreciate that "he's very personable" and has "taken the time to understand us and our business
  • Chambers UK, 2015
    Ronan O’Sullivan gains plaudits from commentators for his creativity and work ethic and is described as “incredibly efficient”
  • Chambers UK, 2014
    Ronan O'Sullivan is "exceptionally responsive" and "sensible, pragmatic and helpful," clients say 
  • Chambers UK, 2013
    Ronan O'Sullivan is lauded by clients, who say: "We value him highly; he is well regarded in the legal department and very well respected in the industry"
  • Legal 500, UK, 2012
    Ronan O’Sullivan has been instrumental in the creation of a "can-do culture within the London team"
  • Legal 500, UK, 2011
    London team is praised for its "intense work ethic," and practice head and newly appointed office head Ronan O’Sullivan has "a great style" and "a quick, analytical mind"
  • M&A Advisor, 2011
    Winner of M&A Advisor's Annual 40 Under 40 Recognition Awards

Speaking Engagements and Publications

  • Trends in International M&A in 2012: A mid-year review, September 2012 (The M&A Lawyer)
  • Pricing Mechanisms: Locked Box vs Completion Accounts, February 2012 (PLC Magazine)
  • Preliminary Observations Regarding Recent Changes to the UK Takeover Regime, November 2011

Professional and Community Involvement

  • Member, City of London Law Society


  • The University of Oxford St Edmund Hall College, B.C.L., 1995 (first class honours)
  • Trinity College, The University of Dublin, LL.B., 1994