US firms dominated the M&A rankings in 2025, according to the latest data from the London Stock Exchange Group (LSEG), with Kirkland & Ellis and Latham & Watkins claiming the top spots for UK and global deals by value.
With 2025 the biggest year for global M&A in four years, and partners in London gearing up for a busy 2026 despite geopolitical instability, the LSEG data highlights the extent to which a small group of elite US players are eclipsing rivals on both sides of the Atlantic.
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