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Siân Chester-Jones

Chief of Staff

Biography

  • Joined Convex in 2019.
  • Worked in Catlin’s Legal and Compliance team, then in Internal Audit, before supporting the UK CEO and UK Chief Underwriting Officer Insurance.
  • Called to the Bar of England and Wales 2014.
  • University of Nottingham – BA Hons First Class.

Convex Group's financial strength

Regulatory Reports
  • $3.9bn

    Shareholder equity at December 2025

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  • A (Excellent)

    AM Best Rating, outlook Stable. Affirmed 17.06.26

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  • A

    Standard & Poors, outlook Stable. Assigned 03.11.25

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