M&A Junior Analyst

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Location: London | Hybrid
Team: Casualty Treaty Underwriting

We are seeking an Underwriting Administrator to join our Casualty Treaty team, providing high‑quality administrative and operational support to underwriters. This role is a vital part of ensuring the underwriting function runs smoothly, accurately, and in line with internal processes and regulatory requirements.

This is a dedicated administration role, well suited to someone who enjoys structured, process‑driven work, takes pride in accuracy, and wants to build a strong and stable career in insurance operations and underwriting support, rather than moving into an underwriting role itself.

• Entering and maintaining risk and policy data accurately across underwriting systems
• Producing, maintaining, and updating underwriting files in line with guidelines and workflows
• Supporting underwriting teams by ensuring documentation and records are complete and up to date
• Monitoring and maintaining operational, compliance, and financial controls (e.g. SOX, Aged Debt reports)
• Assisting with income monitoring, contract signings, and chasing late payments where required
• Ensuring underwriting systems and established processes are consistently followed
• Providing a professional, responsive administrative service to multiple stakeholders

This role would suit candidates with strong administrative, coordination, or insurance support experience.

• Strong attention to detail and a structured approach to work
• Good working knowledge of Microsoft Office
  , particularly Excel and Word
• Ability to manage deadlines, prioritise tasks, and work methodically
• Clear communication skills, both written and verbal
• Professional, reliable, and customer‑focused attitude
• Experience in insurance administration or underwriting support
• Familiarity with underwriting or policy administration systems
• Numeric and analytical confidence

This role is designed as a long‑term underwriting administration position
, offering stability, consistency, and the opportunity to deepen expertise in insurance processes, data accuracy, and operational controls. Support may be provided for relevant professional qualifications
, where appropriate, to strengthen administrative and technical knowledge.

Mosaic is a global specialty insurance platform with an innovative structure allowing deployment of different forms of capital aligned for the benefit of clients and partners. We underwrite for 40 other top‑rated carriers alongside our Lloyd’s syndicates 1609 and 2610—offering lead‑line + syndicated capacity, and claims‑settlement authority across eight product lines via seven countries. We harness the heritage of Lloyd’s and benefit from the market’s global licenses and financial‑strength ratings

Mosaic Transactional Liability team in London is looking for an analyst to join the team to work on all M&A insurance placements. This role provides an exciting opportunity to learn about transactional liability insurance in the fast‑paced M&A environment, develop analytical and commercial skills, gain a deep understanding of corporate transactions, and work alongside experienced underwriters on market‑leading deals.

Key Responsibilities

• Managing workflow on deal opportunities that contemplate use of Warranty and Indemnity Insurance, Tax Insurance and Contingent Insurance, including review of NDAs, management of core inbox for submissions and working with internal teams and 3 rd parties to ensure data collection.
• Analysing mergers and acquisition-related documents, including reviewing financial statements, business background information and purchase agreements, and researching issues related to M&A transactions
• Assis…