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Trends in UK Property and Casualty Insurance Mergers and Acquisitions

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By Joshua Tomlin, Christopher Clarke, and Rían Mullan


A review of UK P&C M&A activity between 2016 and 2025

The United Kingdom is one of the world's leading centres for insurance mergers and acquisitions, underpinned by the breadth and sophistication of its property and casualty (P&C) insurance sector. This report provides a comprehensive analysis of P&C insurance M&A activity in the UK from 2016 to 2025, offering insights for insurers, investors, and advisers operating in the UK insurance market.

Why is the UK a global hub for insurance M&A?

Drawing on a decade of transaction data, this report examines the UK's position within the global M&A landscape, analyses deal volumes and disclosed valuations, and delivers an industry outlook. Detailed case studies of two landmark 2025 transactions explore the acquirers' M&A histories, share price performance, and strategic prospects.

How significant is the UK's share of global P&C deal activity?

The UK ranked second globally by deal count in every year from 2016 to 2025 —behind only the United States—accounting for approximately 10% of worldwide transactions (200 of 2,019 deals). By disclosed value, the UK represented 12% of global activity, with £22.7 billion across 91 transactions. Six deals exceeding £1 billion, all in personal lines, accounted for 74% of the UK total. High-profile consolidation among personal lines insurers, including Aviva, Direct Line, Admiral, Ageas, and RSA, has reshaped the competitive landscape.

Which market segments are driving UK insurance deal volumes?

Beyond personal lines, the report highlights sustained investment in the Lloyd's and London specialty markets during a period of hardening conditions, legacy market activity linked to the post-Brexit environment, and the growing prominence of managing general agents (MGAs) as drivers of underwriting innovation and capital deployment.

 

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Milliman is the global leader in financial risk management, with over two decades of experience helping insurers and insurance-focused asset managers navigate market volatility, regulatory change, capital pressure, strengthen balance sheet resilience and optimize portfolio outcomes.

Our life and annuity risk management capabilities are grounded in deep actuarial expertise and span a wide range of products, including VA, FA, FIA, RILA, and PRT blocks. We help clients manage surplus volatility, create and optimize hedge programs, and comply with evolving accounting and reserve standards.

We engineer ALM, SAA, and portfolio optimization solutions across entire general accounts and targeted blocks, integrating private credit and illiquid structured assets. Our optimization approach incorporates return, risk, capital, and liquidity constraints to support detailed efficient frontier analysis across global regulatory regimes. In capital markets, Milliman supports the design and oversight of over $170 Billion in customized hedge and overlay programs across portfolios, currencies, and risk exposures.

In M&A, we are a trusted advisor, having supported more than three quarters of insurance and reinsurance transactions over the past decade, across major insurance acquisitions, reinsurance, and sidecar structures.

Milliman brings analytical depth and strategic partnership to help our insurance clients solve their most complex challenges, empowering them to grow with strategic insight and confidence.
 

Todd W. Arbuckle
SAA & ALM Strategic Advisor
Todd.Arbuckle@milliman.com
O +1 312.279.3066
M +1 312 953 7868
 

Tony Dardis, FSA, MAA, CERA, CFA  
Principal & Consulting Actuary
Anthony.dardis@Milliman.com
O 312 499 5795
M +1.312 804.7996
 

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