Spotlight

Convex

05

2025 London
Market Brand
Index
02

2024 Employer
Brand Index
06

Share of
Business

Fast response times. Approachable team. Very well-respected leaders and knowledgeable.

Convex was founded in 2019 by Stephen Catlin and Paul Brand, two leaders with deep roots in specialty insurance and reinsurance. Headquartered in Bermuda and London, Convex combines strong underwriting discipline with a fresh, technology-driven approach. With over $3 billion in committed capital, Convex provides coverage across a wide range of complex risks, helping clients navigate an increasingly uncertain world.

Built on a foundation of experience and innovation, Convex emphasizes long-term relationships, financial strength, and a commitment to fair dealing.

What people say about Convex

“Ability to lead. Convex are prepared to write almost anywhere on a programme to help us e.g. they are willing to “top and tail.” They are very good at interacting with clients.”
“Very prompt claims service. They work to assist us with keeping our clients happy.”
  1. Convex was ranked 5th in 2025 London Brand Index.
  2. Ranked 2nd in the 2024 London Market Insurers Employer Brand Index.
  3. Achieved the London Claims Service Quality Marque three years in a row (2023-2025).
  4. Achieved the London Underwriting Service Quality Marque for the second year in a row (2024 and 2025).

PEOPLE

Stephen Catlin
Executive Chairman

In 2019, Catlin co-founded Convex Group Limited, a specialty insurer and reinsurer, with Paul Brand. He initially served as CEO and Chairman, and in June 2022, transitioned to the role of Executive Chairman.

Throughout his career, Catlin has held several influential positions, including Chairman of the Lloyd’s Market Association and President of the Insurance Institute of London. In recognition of his significant contributions to the industry, he was inducted into the Insurance Hall of Fame in 2015.

Paul Brand
Chief Executive Officer

With 36 years of insurance industry experience, including 31 years at Catlin and XL Catlin, Paul served as Chief Underwriting Officer at Catlin from 2003 to 2015, Chief Underwriting Officer (Insurance) at XL Group from 2015 to 2017, and Chairman of Accelerate, XL Catlin’s in-house innovation team, from 2016 to 2018.

Theo Butt
Chief Executive Officer, UK

With over 20 years of insurance industry experience, Theo served as Chief Executive of Neon Underwriting Ltd from 2018 to 2020, previously holding a series of roles at Ascot Underwriting from 2006 to 2018, culminating as Executive Underwriter and Head of Non-Marine, after starting his career in various broking roles at Marsh and JLT.

Sharon Long
Claims Chief Officer

Sharon brings 30 years of experience in claims across technical and senior leadership roles, having previously served as Claims Director at Catlin Claims/XL Catlin where she was instrumental in developing a client-focused service excellence ethos; she is also technically specialized in both Marine and US Casualty lines.

Doug Howat
Chief Underwriting Officer, Insurance

Doug has 33 years of insurance industry experience, having started his career at Catlin in 1989 as an Assistant Underwriter and rising through a range of roles, including Chief Executive of the Energy, Property and Construction division, before serving as Chief Executive of Global Lines (including Specialty) at XL Catlin.

Convex arms

In November 2024, Convex collaborated with Glendale Creative, a graphic design agency, to open their own pub called The Convex Arms. The pub was a pop-up in Leadenhall Market and was open for one week only.

The pub had a full menu, serving mainly burgers and alcohol provided by Boom Bar Burgers. Convex’s logo was visible everywhere, including on menus, the bar, and even branded onto burger buns.