We’ve rebranded! As of July 2022 GB Underwriting rebranded to MX Commercial.

Our underwriting solutions

Real estate

Real estate

Protect your investments and mitigate risks that can knock property developments and portfolio values off track.



Unlock more development opportunities with our range of tools designed to help you to drive renewable transition.



Back up your ESG commitment with insurance and legal expertise, that will put your portfolio on firmer footing.

Mergers & Acquisitions (M&A)

Mergers & Acquisitions (M&A)

Further ensure that your business goals go to plan by wrapping your M&A risks up into one efficient policy.

Commercial Combined

Commercial Combined

Choose a comprehensive package that will suit most of your insurance needs, with flexible limits that are ideal for businesses across a range of sectors.

Property Owners

Property Owners

Protect your more complex cases with solutions that most insurers cannot provide, including options for DSS Lets and Unoccupied Properties.



Provide cover for full contract works, ensuring materials on and off site, hired-in plant and employee tools are all protected.

Can't find what you're looking for?

Can't find what you are looking for?

The MX team is growing, so if you have a query about a risk, do not hesitate to get in touch with one of our experts. If we cannot cover your risk, we promise to provide you with a fast response.

Who are MX?

MX is a growing Managing General Agent (MGA) committed to innovation. We provide solutions for clients with complex and varied insurance requirements. Our specialist experience currently spans across renewables, M&A, real estate, and environmental markets.


MX is a dynamic, people-focused and data driven business, led by highly experienced and specialist underwriters. Today, we bring together a group of over 65 outstanding underwriters and insurance professionals, who are passionate about what we do, who care about our brokers and clients and share the “core values” upon which we will grow.

Learn more about MX

Knowledgeable. Personable. Trusted.

MX Underwriting are knowledgeable experts. They’re approachable. I trust their underwriting. They are happy to engage and find a way to fix a problem and, on Rights of Light, they are considered the best in the market.

Oliver Jackson, Marsh JLT

Great underwriting methodology. Data is second to none. Good people – pragmatic and personable.

Mark Manwaring, Aon

I like the MX Underwriting people and their technical knowledge is outstanding. They have a willingness to look at risks many others wouldn’t and are consistently one of our biggest markets.

Mark Swallow, WTW

We have been working with MX Underwriting for the past 18 months and its clear to see how important it is to have insurance companies as part of the property and development life cycle. They are at the forefront in the industry solving real-world property challenges and enable world-class development to happen. It's a pleasure working with such a dynamic team.

Keith Griffiths, Built Environment Network

A Specialist Risk Group Company

Our parent company, Specialist Risk Group (SRG) is one of the fastest-growing group of insurance intermediaries in the UK.

MX is the Group’s Managing General Agent (MGA). And is part of a wider selection of businesses within the Group that provide a bespoke service to our unique markets and clients. With a global-reach, SRG is making their mark on the industry as a culture-driven and people-focused business.

These values extend to MX, who are united in the Group’s pursuit to create a company we are proud to tell our friends and family about. MX operates independently to SRG when working with broker partners and clients.

Learn more about SRG

Contact us

Get in touch with the MX team today to learn more about our appetite and how we can support your business. 

Speak to us