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Saoirse O'Reilly's practice concentrates on international commercial litigation and arbitration. She has been recognized as a "key lawyer" in these fields by The Legal 500, which describes her as "a rising star," "a first-class senior associate," and "incredibly hard working and precise."

Saoirse advises international corporations, private equity firms, and ultra-high-net-worth individuals (UHNWIs) on high-stakes contractual disputes involving warranties, guarantees, and contractual negotiations and terminations.

Recent representative matters include, successfully advising an international hotel group in a series of arbitrations against a prominent hotel franchisor arising from a €300 million hotel portfolio divestment; defending a claim against an offshore bank in excess of £415 million, relating to an alleged carousel fraud; advising a U.S.-based private equity firm in a battle over Europe's largest aluminium smelter; and acting for the owner of a football club in a multimillion pound claim arising from the aborted sale of the club.

Saoirse routinely acts for clients in the aerospace sector and has spent time seconded to the litigation team at Boeing, where she worked on a range of contractual disputes and commercial matters. She is currently acting for an aviation company in a dispute regarding a performance guarantee valued at more than £50 million.

Saoirse works closely with the Firm's business restructuring & reorganization team, advising on contentious matters, such as the high-profile investigation into the retail collapse of the BHS Group.

The Legal 500 identifies Saoirse as "a great lawyer," "a pleasure to work with," and "completely hands on and anticipates the best points and how to deconstruct them."


  • AIP acquires Aluminium BelgiumJones Day advised American Industrial Partners in the acquisition of 100% of the shares of Aluminium Belgium BV, the parent company which owns Aluminium Duffel, from Ecnavla 8 UK Ltd.
  • Macquarie sold Condor FerriesJones Day advised Macquarie Infrastructure and Real Assets in the sale of Condor Ferries, an operator of lifeline freight and passenger ferry services between Guernsey, Jersey, the United Kingdom, and the Port of St. Malo in France, to a consortium of Columbia Threadneedle European Sustainable Infrastructure Fund (ESIF) and Brittany Ferries.
  • BHS insolvency officeholders seek advice relating to investigations arising from company's collapseJones Day is acting for Geoff Rowley and Tony Wright as the insolvency officeholders of UK high street retailer, British Homes Stores ("BHS"), on investigations into the causes of the company's collapse and pursuing avenues of recovery for creditors.
  • Byron Hamburgers enters into company voluntary arrangementJones Day advised the casual dining chain, Byron Hamburgers Limited, on the approval by its creditors of a company voluntary arrangement within the context of a wider financial and operational restructuring of the company.
  • Macquarie European Infrastructure Fund II and Condor Ferries Group complete debt refinancingJones Day represented Macquarie European Infrastructure Fund II (MEIF II) and the Condor Ferries Group, an operator of passenger and freight ferry services, in connection with the refinancing of Condor's senior facilities.
  • CBRE GIP's European Co-Investment Fund acquires portfolio of assets from Prologis UKJones Day advised CBRE GIP's European Co-Investment Fund (a Dutch incorporated fund) in relation to the acquisition of a portfolio of 22 UK logistics assets (mix of development and stabilized assets) and circa 20 associated property holding companies and management companies, and the formation of an associated 85/15 joint venture with Prologis UK.
  • Fourth Alcuin Fund acquires minority stake in Air Charter ServiceJones Day represented The Fourth Alcuin Fund LP, a fund managed by Alcuin Capital Partners LLP, in connection with its minority stake investment in Air Charter Service, a global leader in providing aircraft charters.