Aventum Group
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.
- Company typePrivate
- Founded1996
- HeadquartersLondon, United Kingdom
- Headcount11–50
- GTM typeB2B
- OfferingServices
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.
Aventum Group firmographics
Firmographics- 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
Aventum Group industry classification
Industry- 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
Where Aventum Group is headquartered
LocationHeadquarters
- HQ city
- London
- HQ country
- United Kingdom
- HQ region
- Europe
Offices7 records
Markets served
Aventum Group business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Technology or R&D, Operations, Marketing or Sales, Infrastructure
Revenue model
- 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.
- 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
Aventum Group product offering
Product offeringCore 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
Companies that use Aventum Group
Customer profileNamed customers1 record
Segments3 records
Ideal customer profiles2 records
Aventum Group technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
AI capability8 records
Feature2 records
Aventum Group partnerships and signals
Strategic signalScale indicators7 records
Recent moves7 records
Expansion highlights6 records
Aventum Group competitors and assessment
Company assessmentDirect 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
Aventum Group social profiles
Digital presenceAventum Group compliance and trust
Trust signalCompliance1 record
Aventum Group financial estimates
Financial estimateRevenue estimate
Valuation estimate
Aventum Group leadership team
Management profileNumber of profiles
Profiles15 records
Aventum Group subsidiaries and ownership
Company hierarchySubsidiaries4 records
Aventum Group funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Aventum Group M&A and investment
M&A and investmentM&A1 record
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Aventum Group
What does Aventum Group do?
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.
Is Aventum Group a public or private company?
Aventum Group is a private company. It is classified as management employee owned and is currently operating.
When was Aventum Group founded?
Aventum Group was founded in 1996. It employs 11 to 50 people.
Where is Aventum Group based?
Aventum Group is headquartered in London, United Kingdom, in the Europe region.
How does Aventum Group make money?
Two revenue lines are on record. Specialty Re/Insurance Underwriting is the primary driver. The others are lloyd's and London Market Broking.
Who are Aventum Group's main competitors?
Direct peers on record are Canopius, Convex Group, Lancashire Holdings, Tokio Marine Kiln, Hamilton Insurance Group, Beazley and Hiscox. Insurity is listed as an others. Ardonagh Group is listed as an emerging player. Liberty Specialty Insurance is listed as a broad incumbent.
Does Aventum Group have an API?
No public API is recorded for Aventum Group.
What industry is Aventum Group in?
Aventum Group's product category is Specialty Re/Insurance. Its primary akta.pro industry code is FSAGAGAB, Policy Administration, Underwriting & Rating Platforms (Core Insurance SaaS), with a secondary code of FSAEADAI, Surety & Bond Brokerage. Its NAICS code is 5242 and its SIC code is 6411.