Scale is as good a signal as any of where the UK MGA market is heading. The businesses below have grown into some of the largest delegated underwriting authorities in the country, some through acquisition and consolidation, others by building out specialist product lines one at a time. Here’s our pick of ten of the biggest UK MGAs worth watching, and what’s driving their growth.
CFC Underwriting
CFC is the UK’s largest independent MGA, with a significant share of its business international, particularly in North America. It pioneered cyber insurance and now writes around 50 specialty products across roughly 20 classes for more than 150,000 businesses in 90 countries, backed by an in-house CFC Response breach team and a live pilot of agentic AI quoting for low-complexity risks.
DUAL UK
DUAL, part of Howden Group, has built one of the broadest specialty books in the UK MGA market, spanning 27+ product lines and 500+ people across professional indemnity, cyber, M&A/transactional risk, construction and bloodstock and equine cover. It keeps expanding by acquisition, adding travel-failure specialist International Passenger Protection in 2024, and in July 2026 launched a unified global Transactional Risk practice.
Pen Underwriting
Pen Underwriting is one of the UK’s largest MGAs, running its own pricing, claims and actuarial functions across property owners, construction and casualty, marine, motor trade and sports and leisure lines on behalf of its capacity partners. It hit a major premium milestone ahead of schedule in 2024, and in August 2026 doubled its property owners’ capacity to £120m through a new deal with Endurance Worldwide.
Rokstone
Rokstone, the underwriting arm of Aventum Group, works with more than 30 capacity partners across property, marine, aviation, casualty and financial institutions. It’s expanded fast, adding new Lloyd’s coverholder boxes, a Dubai office, new cyber and healthcare divisions and, in April 2026, its first acquisition under Aventum in marine specialist Post & Co.
Optio Group
Optio Group has grown from a single-product start-up in 2018 into a specialty MGA platform spanning 30+ products from 18 offices in 15 countries. In July 2026, private equity firms Cinven and La Caisse agreed to jointly acquire a majority stake from existing backer Preservation Capital Partners, with founder-CEO Deepak Soni and the management team remaining in place.
Nexus Underwriting
Nexus Underwriting, part of Brown & Brown’s Arrowhead Intermediaries platform since 2023, operates through 300+ people across three continents, spanning 20 risk classes from trade credit and financial lines to aviation. It keeps adding specialist capability, folding medical-tourism MGA Sure Insurance Services into its Millstream Underwriting business in January 2026 and launching a US fine art line in April 2026.
Carbon Underwriting
Carbon Underwriting, an appointed representative of Davies MGA Services, writes primarily into its own dedicated Lloyd’s syndicate, 4747, the first Syndicate-in-a-Box to graduate to full syndicate status, with a second syndicate, 5757, in the pipeline. It’s grown quickly since 2023, and in June 2026 backer Apiary Capital sold its stake to FTV Capital in a growth-equity deal reported at a 6x return.
MX Underwriting
Founder Jantharna Kaenprakhamroy started Tapoly after struggling to insure a short-term Airbnb let. It’s grown into flexible, on-demand cover for freelancers, professionals and businesses across the sharing economy, with a fully digital quote process and white-labelled SaaS options for wholesale and retail partners.
Bspoke Insurance Group
Bspoke Insurance Group brings together niche MGA brands spanning commercial, property, high-net-worth, lifestyle and sports and leisure cover, and has grown through a SiriusPoint capacity deal and acquisitions including Miramar Underwriting. NFP, an Aon company, acquired the group in August 2025, its constituent brands continue to operate independently and it won MGA of the Year at the 2025 National Insurance Awards.
Prestige Underwriting
Surety bonds (performance, retention, advance payment) are a persistent capacity gap for UK construction and property firms. DRS Bond MGA, backed by DRS Bond Management’s underwriting expertise, brings brokers uncollateralised surety terms so clients can meet contractual and regulatory requirements without tying up working capital.
Constant innovation is only possible with the right systems behind it. Insly’s platform covers the full insurance lifecycle for MGAs and insurers, from product design and distribution to accounting and claims, with Nora, Insly’s AI layer, removing manual work at every stage and an AI-guided Claims Portal that takes policyholders from first notice of loss to resolution without a phone call.
We work with 70+ MGAs and insurers and on average our customers handle double the gross written premium they managed on their previous systems.
