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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.


  • FLSV Fund Administration Services LLC ("FAS") and its owners on its agreement for the disposal of FAS to Sanne Group plc for a total consideration of $65.8 million subject to customary adjustments;
  • Computer Science Corporation on its strategic alliance with, and investment in, eBECS Limited;
  • 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;
  • DexCom, Inc., a leading provider of continuous glucose monitoring technology to both patients and healthcare professionals, on its acquisition of Nintamed, a distribution company with presence in Germany, Switzerland and Austria;
  • 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$400 million 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;

Accolades and Recognitions

  • Ronan O’Sullivan – Recommended for Corporate/ M&A – High-end Capability and Mid-Market - Chambers UK, 2017
  • Ronan O'Sullivan “knows our business really well; he can apply the law to the business in a practical way." He is a well-regarded name in the field and has recently advised clients in the sports, shipping and private equity areas." - Chambers UK, 2017
  • 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, 2016
  • Ronan O’Sullivan gains plaudits from commentators for his creativity and work ethic and is described as “incredibly efficient” - Chambers UK, 2015
  • Ronan O'Sullivan is "exceptionally responsive" and "sensible, pragmatic and helpful," clients say - Chambers UK, 2014  
  • 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" -Chambers UK, 2013

Speaking Engagements and Publications

  • Brexit – The UK's departure from the single market, January 2017
  • UK chapter of China Law & Practice’s 2016 China Outbound Investment Guide
  • Pricing Mechanisms: Locked Box vs Completion Accounts, February 2012 (PLC Magazine)


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