Aventum Group

What Aventum Group does

Aventum Group is a London-headquartered, employee-owned global specialty (re)insurance group operating across both underwriting and broking. Founded in 1996 and trading through Aventum Group Limited (a subsidiary of Direct Group Holdings Limited), the Group serves insurance markets in the United Kingdom, Ireland, the Netherlands, Belgium, Germany, the United Arab Emirates, Japan, and North America. Underwriting capabilities are delivered through Rokstone (specialty lines including casualty, surety, and property), the recently acquired Marine specialist Post & Co (founded 1918, headquartered in Rotterdam), and iSure in Ireland, while Lloyd's and London Market broking is conducted through FCA-regulated Consilium Insurance Brokers (FRN 306080). Distribution is wholesale and broker-mediated, reaching approximately 250 brokers across Europe and Asia for Marine lines and a global network of Lloyd's and wholesale brokers for other specialty classes.

The Group's technological core is ATOMX, an AI-powered integrated insurance cloud platform built from scratch with a self-funded $12 million investment and operated by a 130-person technology team representing roughly 25% of total headcount. ATOMX delivers seamless integration across underwriting, risk management, and operations and is reported to save over 1,000 staff hours per month and an anticipated $2 million annually. Supporting internal platforms include the Ascend learning system, the Applaud employee recognition tool, the Bear Cave innovation competition, and a dedicated Innovation Lab. The Group is structured as a platform-plus-module architecture with a self-built proprietary technology stack, and earned FCA-regulated access to the Lloyd's marketplace through Consilium.

Aventum generates revenue through two primary streams: specialty re/insurance underwriting (premium income from risk assumption across Marine, casualty, surety, and property) and Lloyd's and London Market broking (commissions and fees from placing risk on behalf of clients). Pricing is quote-based and tailored to individual risk profiles rather than published. The go-to-market combines enterprise field sales (Rokstone-led ATOMX deployment) with channel partner distribution through Lloyd's brokers, wholesale brokers, and Post & Co's Continental European broker network. All employees participate in a global Company Share Option Plan (CSOP) releasing 10% of equity, and the Group invests heavily in employer brand — winning Great Place to Work certification for four consecutive years, ranking 11th on the UK's Best Workplaces 2026, and securing sponsorship of Formula 1 driver Ollie Bearman at MoneyGram Haas F1 Team.

Name

Aventum Group

Legal name

Aventum Group Limited

Website

https://aventumgroup.com

Company type

Private

Founded year

1996

Operating status

Operating

Headcount range

11–50 employees

Short description

Aventum Group is a London-based, employee-owned global specialty (re)insurance group operating underwriting (Rokstone, Post & Co) and Lloyd's broking (Consilium) businesses, serving clients across the UK, Europe, the Middle East, and North America via its ATOMX AI-powered insurance platform.

Ownership category

akta.pro rank

Product category

Specialty Re/Insurance

NAICS

Agencies, Brokerages, and Other Insurance Related Activities (5242), Insurance Carriers (5241), Insurance Agencies and Brokerages (52421)

SIC

Insurance Agents, Brokers & Service (6411), Fire, Marine & Casualty Insurance (6331), Surety Insurance (6351)

akta.pro primary industry

Policy Administration, Underwriting & Rating Platforms (Core Insurance SaaS) (FSAGAGAB)

akta.pro secondary industries

Surety & Bond Brokerage (FSAEADAI), Data, Analytics & AI for Insurance (Risk, Pricing, Personalization) (FSAGAGAE), Customer Engagement, CRM & Agent/Broker Enablement Platforms (FSAGAGAD)

Keywords

• Specialty reinsurance
• Insurance underwriting
• Insurance broking
• Lloyd's market
• Marine insurance

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices7 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Technology or R&D, Operations, Marketing or Sales, Infrastructure

Revenue model

1. Specialty Re/Insurance Underwriting: Aventum operates as a specialty re/insurance group with market-leading underwriting businesses that generate premium income through risk assumption across Marine, casualty, surety, and property lines.
2. Lloyd's and London Market Broking: The Group operates Lloyd's and London Market broking companies that earn commissions and fees by placing insurance and reinsurance risk on behalf of clients through the Lloyd's marketplace and specialist company markets.

Go-to-market motion2 records

Distribution channels3 records

Marketing channels6 records

Core offering

Aventum Group is a global specialty (re)insurance group that underwrites specialty insurance risks across Marine, casualty, surety, and property lines through its underwriting subsidiaries Rokstone and Post & Co, and places insurance and reinsurance risk through Lloyd's and London Market broking company Consilium Insurance Brokers Limited. Distribution is supported by approximately 250 brokers across Europe and Asia, with the entire operation powered by ATOMX, an AI-powered insurance cloud platform.

Product overview

Aventum Group is a global specialty (re)insurance group operating across underwriting and broking sectors. The Group's core technology platform is ATOMX - an AI-powered integrated insurance cloud ecosystem that underpins the Group's operations. Underwriting capabilities are delivered through Rokstone (specialty insurance with casualty, surety, and property lines) and the acquired Marine specialist Post & Co. Broking operations are handled by Consilium Insurance Brokers Limited. Supporting products include Ascend (learning platform), Applaud (recognition platform), Bear Cave (innovation initiative), Innovation Lab (R&D), and CSOP (employee ownership scheme). The architecture is a platform-plus-module structure centered on ATOMX, with supporting internal tools for employee engagement, development, and innovation.

Differentiator

Problem solved

Functional benefit

Brands

• ATOMX: AI-powered integrated suite of innovative products delivering Aventum's fully featured insurance cloud platform. Built from scratch to meet evolving group needs, ATOMX is self-funded with a $12 million investment.
• Rokstone
• Consilium
• iSure

Products and services

• Specialty (Re)Insurance Underwriting Specialty re/insurance underwriting across Marine, casualty, surety, and property lines, operated by Aventum through its underwriting subsidiaries Rokstone and Post & Co. The Group generates premium income through risk assumption across these specialty lines for clients and brokers seeking non-standard or complex risk capacity.
• Rokstone Specialty Insurance Underwriting Rokstone is Aventum's specialty insurance underwriting business operating as an appointed representative of Consilium Insurance Brokers Limited. It handles casualty, surety, and property underwriting with global capabilities and is expanding its footprint across Continental Europe through the Post & Co acquisition.
• Post & Co Marine Insurance Post & Co is a Marine specialist MGA founded in 1918, headquartered in Rotterdam, with offices across the Netherlands, Belgium, and Germany. It distributes Marine insurance lines through approximately 250 brokers across Europe and Asia, with Lloyd's and specialist company market backing. Now part of Aventum Group following its 2026 acquisition.
• Consilium Insurance Broking Consilium Insurance Brokers Limited is Aventum's FCA-authorised and regulated (FRN: 306080) Lloyd's and London Market broking company. It places insurance and reinsurance risk on behalf of clients through the Lloyd's marketplace and specialist company markets, and serves as the principal for Rokstone as an appointed representative.

Quantifiable outcome

• ATOMX saves over 1,000 staff hours per month and an anticipated $2m annually
• +2 more outcomes

Named customers1 record

Segments3 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability8 records

Feature2 records

Scale indicators7 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Canopius: Canopius is a London-based specialty insurance group operating across Lloyd's and company markets, underwriting property, casualty, marine, and specialty lines - a direct peer in scale and distribution approach.
• Convex Group: Convex is a Bermuda-based specialty insurer and reinsurer launched by industry veterans, writing casualty, marine, aviation, and property lines - comparable as a fast-growing private specialty platform.
• Lancashire Holdings: Lancashire is a specialty insurer and reinsurer focused on marine, aviation, energy, and property lines operating through Lloyd's - comparable to Aventum's specialty re/insurance platform with similar geographic distribution.
• Tokio Marine Kiln: Tokio Marine Kiln is a Lloyd's managing agent underwriting marine, energy, aviation, casualty, and specialty lines - a direct peer at Lloyd's with overlapping specialty product mix.
• Hamilton Insurance Group: Hamilton is a Bermuda-headquartered specialty insurer and reinsurer with Lloyd's Syndicate operations underwriting specialty lines - directly comparable in scale, specialty focus, and dual-platform model.
• Beazley: Beazley is a London-headquartered specialist insurance group operating across Lloyd's and the London Market, underwriting marine, casualty, property, and specialty lines - directly comparable to Aventum's Rokstone and Consilium operations.
• Hiscox: Hiscox is a Bermuda-headquartered specialty insurer with significant Lloyd's presence, underwriting marine, casualty, and specialty lines globally - a direct peer in size, market, and product mix to Aventum.

Others

• Insurity: Insurity is a US-based insurance technology platform providing core systems and analytics to specialty insurers - adjacent peer recognized Aventum's ATOMX at its Excellence in Insurance Conference; comparable as a technology partner/competitor in insurance SaaS.

Emerging players

• Ardonagh Group: Ardonagh is a UK-based insurance platform built through M&A roll-up of brokerages and MGAs - comparable in growth trajectory and acquisition-led platform strategy, though more broking-focused than underwriting.

Broad incumbents

• Liberty Specialty Insurance: Liberty Specialty Markets is the London-based specialty arm of Liberty Mutual, operating across Lloyd's and London Market - a broad incumbent with overlapping specialty lines including marine, casualty, and property.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Instagraminstagram.com/theaventumgroup
• Xx.com/AventumGroup
• LinkedInlinkedin.com/company/aventum-group

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles15 records

Subsidiaries4 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A1 record

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Aventum Group