Who We Are

Arthur Cox is one of Ireland's largest law firms. We are an "all-island" law firm with offices in Dublin and Belfast. The firm also has offices in London, New York and Silicon Valley. Our practice encompasses all aspects of corporate and business law.

For almost 100 years, we have been at the forefront of developments in the legal profession in Ireland. From the outset, we have striven to deliver superior levels of service, building relationships that grow over time and developing specialist industry knowledge to help our clients achieve their goals.


A Brief History of the Firm

Arthur Cox & Co commenced practice in 1920 at 5 St Stephen’s Green. There were two partners – Arthur Cox and John McAreavey.


The firm was so successful that by 1926 they had outgrown No 5 and acquired two of the most elegant buildings on the Green – numbers 42 and 43. From the outset, Arthur Cox & Co’s client list was enviable. The birth of the Free State created many opportunities for work and as a friend and trusted advisor to the State’s founders, Arthur Cox’s influence in shaping industrial policy over the next three decades was immense. He opined on many landmark documents such as the Treaty and is widely acknowledged as the architect of The Companies Act, 1963. Although an intensely private individual, Arthur Cox ventured somewhat reluctantly into public life during the 1950s. He served as President of the Incorporated Law Society 1951/52 and was nominated by the Taoiseach to the Senate in 1954, where he sat for three years.


In 1961, following the death of his wife, Arthur Cox decided to bow out of busy practice life to join the priesthood. He was very fortunate that the firm’s affairs could be placed in the capable hands of Niall McLaughlin, Daniel O’Connor and Frank Scott (each of whom would later have sons in the practice: Paul and Peter McLaughlin, Dan O’Connor and Ian Scott). On 15 December 1963 he was ordained a priest and the following year, at the age of 73, he set off for a well-established Jesuit Mission in Monze, Northern Rhodesia. This gentle, albeit primitive, lifestyle suited Fr Cox very well. On 11 June 1965, he met with his untimely death following a road traffic accident. The news of Arthur Cox’s death was a double blow to his former partners back in Dublin as that very same week Frank Scott died suddenly of a heart attack.


Late 1965 and the firm had four partners: Niall McLaughlin, Daniel O’Connor, Vincent Walsh and Denis Bergin. In 1971 Arthur Cox & Co amalgamated with Peeble Knox and Pigot and by 1974, with ten partners and a sizeable support staff, it became necessary to take additional office space. The second floor of a newly built office block at 44 and 45 St Stephen’s Green fitted the bill. In 1985 number 41 St Stephen’s Green was added to the firm’s premises. By this time, and to accommodate its staff of almost 60, the firm was also occupying the first floor of numbers 44 and 45. The 1990s hailed a whole new era of expansion for the newly named Arthur Cox and by 1996 it had doubled in size and opened an office in Belfast. On 31 December 1997, the front door of 41 to 45 St Stephen’s Green was closed for the last time as the 200 strong practice took up residence in 55,000 sq. ft. of modern office space in the Earlsfort Centre – almost twice the space previously occupied. The firm continued to go from strength to strength, beginning the new millennium with a staff in excess of 300.


In March 2017, the firm moved to a new purpose-built building over 12,000 sq. m. in size at Ten Earlsfort Terrace, located on the corner of Earlsfort Terrace and Hatch Street, to accommodate over 850 staff.