Allen & Overy was founded on 1 January 1930 by George Allen and Thomas Overy, formerly partners at Roney & Co. A member of the UK's Magic Circle of leading law firms, Allen & Overy was widely considered to be one of the world's most elite law firms, advising national and multinational corporations, financial institutions, and governments.
As a British multinational law firm with a strong international presence, Allen & Overy operated in over 40 offices worldwide. The firm had 590 partners and over 5,800 employees worldwide, and in 2023 reported revenue of £2.1 billion, making it the second largest law firm headquartered in the UK by revenue. It was widely recognized for its finance, corporate and cross-border practice areas, serving global clients on complex international matters.
In 2024 Allen & Overy merged with Shearman & Sterling to form A&O Shearman, combining two elite firms and underscoring its reputation as a high-performing, internationally focused legal platform.
Facts compiled by Executive Moves from publicly available news and press releases on 31 October 2026. Spotted an inaccuracy? Email us and we'll review within 1 business day.
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