
With international corporate M&A and private equity being the hallmark of the firm, William Fry LLP displays an impressive roster of clients in the sector, working with some of the world’s largest corporates. Spearheaded by M&A heavyweight Ivor Banim, the London office advises on complex transactional work, regularly working in conjunction with the firm’s offices in Cork and Dublin. The firm also displays expertise in real estate, particularly in the retail and leisure sector, as well as in public sector work; the firm is often found advising the State on high-value, multijurisdictional issues. Other key figures include Brian Butterwick, rated by clients as a ‘very solid operator’, and Aisling O’Gorman, noted for her expertise in renewable energy work, and wind power in particular.
Legal 500 Editorial commentary
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Testimonials
Collated independently by Legal 500 research team.
- 'Complete experts in Irish law coupled with responsiveness and excellent client service.'
- 'Brian Butterwick is a very solid operator - knowledgeable, responsive and just generally easy to work with.'
Key clients
- Amgen
- SoftBank
- AIB
- Tesco
- DCC plc
- Edwards Lifesciences plc
- Glanbia
- York Capital Management
- Lazard Asset Management
- Mayfair Equity Partners
Work highlights
- Advised UKG Inc. the United States based software-computer company on the acquisition of Immedis Limited and its subsidiaries for a reported €575 million.
- Advised Amgen, one of the world's leading independent biotechnology companies, on its acquisition of Horizon Therapeutics plc, a global biotechnology company headquartered in Dublin, for an enterprise value of $28.3 billion.
- Advised the Irish Department of Finance on (i) the sale by the State of approximately 10% of AIB Group plc by way of two separate accelerated book built placings, raising gross proceeds of approximately €995m; and (ii) on the sale of 5% of permanentTSB by way of an accelerated book-built placing to institutional investors.
Lawyers
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.

Next generation partners
Junior partners with significant recognition from clients and peers in the market and key roles on multiple matters.
Practice head
Ivor Banim
Other key lawyers
Brian Butterwick; Lorena Dunne; Aisling O'Gorman