A partner in the Tax Department, Cian O’Connor advises clients on a wide range of U.K. and international tax matters, with a focus on private equity and real estate tax structuring. O'Connor has handled the tax aspects of a wide range of complex cross-border deals, including acquisitions, disposals, joint ventures, financings, restructurings and capital markets offerings. He also advises on tax considerations in fund formation and portfolio company matters. O'Connor represents private equity sponsors, sovereign wealth funds, real estate investors, corporate clients and financial institutions.
Lawdragon Honors
| Honor | Year | Practice |
|---|---|---|
| The 2026 Lawdragon 500 X – The Next Generation | 2026 | Tax |
| The 2025 Lawdragon 500 X – The Next Generation | 2025 | Tax |
| The Inaugural Lawdragon 500 Leading Global Tax Lawyers | 2025 | Tax, Private Equity, Real Estate |
O'Connor’s recent representative matters include advising:
- General Atlantic
- Blackstone
- The Kraft Heinz Company in its separation into two independent publicly traded companies through a tax-free spin-off
- IonQ in its $1.075 billion acquisition of Oxford Ionics
- GSK in its acquisition of CMG1A46 from Chimagen Biosciences
- Enstar Group, a Bermuda-based insurance company, in its $5.1 billion sale to Sixth Street and other institutional investors
- Qualcomm in its acquisition of Alphawave Semi, with an enterprise value of approximately $2.4 billion
- Brighton Park Capital in its $112 million investment in PortSwigger
- AMG in its acquisition of a minority equity interest in Montefiore Investment SAS, a investment firm with €5 billion in assets under management
- RXO in its $1.025 billion acquisition of Coyote Logistics from UPS
- TA Associates and Warburg Pincus in their joint acquisition of Epassi Group, and in Epassi’s combination with Exercite
- Beacon Rail in its definitive agreement to acquire Mitsui Rail Capital Europe
- Travelodge in its high-yield refinancing and shareholder distribution
- Noble in its $600 million offering of senior notes
- Cushman & Wakefield in the launch of an underwritten public offering of 12,500,000 ordinary shares
- AXA Investment Managers - Real Assets in the acquisition of the Kadans Science Partner platform
- Ares in the acquisition of a portfolio of mixed use commercial properties across Europe
- Goldman Sachs, Park Square and NGA Human Resources in the sale of NGA’s UK mid-market and small and medium business divisions to Bain Capital Private Equity
- TDR Capital, Sun Capital and their portfolio company Keepmoat Limited on the sale of Keepmoat’s regeneration arm to energy and services provider