Boutique London Insurance Broker & Consultant

At Sioma, we recognise that every business faces its own set of unique risks and challenges.
That is why we take the time to understand your business and create the right portfolio of insurance policies to protect you.
We pride ourselves on our technical knowledge and personal service to deliver the best experience for our customers.

We also have access to a wealth of risk management documentation which we provide our clients to support their businesses.

Who do we advise?

Businesses in the following sectors:

  • Technology & Start Ups (all industries including FinTech)

  • E-Commerce Platforms & Marketplaces

  • Retail​

  • Wholesale

  • Manufacturing

  • Car Parking & Enforcement

  • Hospitality (Hotels, Bars and Restaurants)

  • Financial & Professional Services 

  • Property Owners - Let & Unoccupied

  • Construction

  • Motor Trade

  • Transport

  • Charity

  • Education

Mid & High Net Worth Individuals with:

  • Unique Homes

  • Fine Art​

  • Antiques

  • Jewellery

  • Classic and High-Value Cars

  • Worldwide Travel

  • Yachts

  • Secondary Residences

  • Property Portfolios

  • Private Healthcare

Founder's Story

Alexander Margolin, spent 6 years at Allianz prior to founding Sioma Ltd. During his time at Allianz, Alexander was recognized by the industry and awarded Young Underwriter of the Year at the Insurance Post Underwriting Services Awards in 2015.

While working as Senior Property and Liability Underwriter in the City of London at Allianz, one of the largest insurance companies in the world, Alexander completed his Insurance professional exams in 2015 to become an Associate of the Chartered Insurance Institute and holds the title of a Chartered Insurance Broker.


Alexander left the city in 2018 to fulfill a vision of running his own business and utilizing his industry knowledge to provide the best insurance service available to UK businesses and high net worth individuals. In 2019, after a decade in the industry, Alexander was named as one of the top 24 talents under the age of 35 in the UK insurance industry by Insurance Business UK .

Client Reviews


Our industry is a minefield of legislation and contractual obligations which require comprehensive indemnity insurance. There was a real void in the insurance market for the type of coverage we needed.

Alexander Margolin of Sioma Insurance was able to broker a policy that met all our commercial and legal requirements at a competitive rate.

I cannot recommend Alexander highly enough for his professionalism, business acumen and depth of knowledge.

William Hurley, Chief Executive Officer

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Our Team

At Sioma, our clients have access to a team of highly trained advisors, account handlers and claims handlers to ensure we always provide you with an excellent service.


Some of our key team members include:


Alexander Margolin BSc (Hons), ACII

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Founder | Chartered Insurance Broker

Alexander is the founder of Sioma and a Chartered Insurance Broker. As the principal consultant at Sioma, Alexander is always looking to best advise and support UK businesses and individuals, utilising his knowledge and expertise gained with a decade of experience in the insurance industry.

Alexander was recently named by Insurance Business UK as one of the top 24 talents under the age of 35 in the UK insurance industry.

Get In Touch

235-241 Kingsbury Road

0208 205 3000

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