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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.


Mr. O’Sullivan’s recent experience includes advising:

  • Jacobs Engineering on its agreement with Saudi Aramco to form a Saudi Arabian-based joint venture to provide PMCM services to clients in the Kingdom of Saudi Arabia and across the Middle East and North Africa; 
  • Aman Resorts on a number of confidential transactions; 
  • Starwood Capital on its joint venture with Tunstall Real Estate Management to implement the acquisition of U.K. social housing regeneration company, Pinnacle Group Limited; 
  • An ad hoc committee of various bondholders on the recapitalisation of the Co-operative Bank plc
  • DXC Technology (formerly Computer Sciences Corporation) on its strategic alliance with, and investment in, eBECS Limited; 
  • Filtration Group on the acquisition of the Porous Technologies business of U.K.-based industrial group Essentra plc. for £220 million; 
  • City Football Group, the Abu Dhabi controlled 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 the $400m investment by China Media.

Accolades and Recognitions

  • Described by clients as a "bright, gifted lawyer who really guides clients well" – Chambers U.K., 2018 
  • Recommended for Corporate/ M&A – High-end Capability and Mid-Market – Chambers U.K., 2018 
  • 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 U.K., 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 U.K., 2016 
  • Ronan O’Sullivan gains plaudits from commentators for his creativity and work ethic and is described as “incredibly efficient” – Chambers U.K., 2015 
  • Ronan O'Sullivan is "exceptionally responsive" and "sensible, pragmatic and helpful," clients say – Chambers U.K., 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 U.K., 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
  • PLC Magazine Pricing Mechanisms: Locked Box vs Completion Accounts, February 2012


  • The University of Oxford – St Edmund Hall College, B.C.L., 1995 (First-class honours)