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Europe's Top Private Equity Firms: The Law Firms Behind Their Biggest Deals

Reported by Law
Sep 28, 2026· 2 min read
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Key Takeaways
  • • Advent International leads European private equity deal activity with $64.18 billion in transaction value over the past two years, completing six deals—the highest volume among global PE firms targeting European assets.
  • • Kirkland & Ellis serves as the primary legal adviser to Advent International, having advised on four deals valued at $50.4 billion combined, with Adrian Maguire identified as a key relationship partner.
  • • Law.com's analysis draws from comprehensive transaction data spanning 2024–2026 (announced deals including pending and completed transactions) sourced from the London Stock Exchange Group and Mergermarket, supplemented by interviews with 20+ leading private equity lawyers.
  • • The research identifies adviser relationships among the five largest European private equity firms by funds raised, establishing which law firms command the strongest institutional ties within the sector.
Summary
Law.com conducted an in-depth investigation into the law firms advising Europe's leading private equity firms, interviewing more than 20 senior PE lawyers across the UK and Europe and analyzing transaction data from the London Stock Exchange Group and Mergermarket. The research examined deal activity over the past two years to identify which legal advisers maintain the strongest relationships with major PE acquirers pursuing European targets.

The analysis identified Advent International as the most active European private equity firm by deal value, with transactions totaling $64.18 billion over the two-year period. Advent completed six deals during this timeframe—representing the highest transaction count among global PE firms acquiring European targets. The firm's advisory relationships reflect the scale of its activity, with Kirkland & Ellis serving as its primary legal counsel.

Kirkland & Ellis has been the most active adviser to Advent International, advising on four transactions valued at $50.4 billion combined. Adrian Maguire is identified as a key relationship partner at Kirkland in managing this mandate. The firm's largest single engagement for Advent during the period was valued at $34 billion, demonstrating the scale of individual transactions within the top tier of European PE activity.

The Law.com investigation analyzed transaction data covering all deals announced between 2024 and 2026, including both pending and completed transactions while excluding withdrawn or cancelled deals. Deal valuations incorporate target net debt, providing a comprehensive measure of transaction size. By synthesizing transaction records with primary interviews of leading practitioners, the research establishes a clear mapping between Europe's largest PE acquirers and their core legal advisers.

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Law Europe's Top Private Equity Firms: The Law Firms Behind Their Biggest Deals