MS Reinsurance

What MS Reinsurance does

MS Reinsurance is a Zurich-headquartered global non-life treaty reinsurer and a wholly-owned subsidiary of MS&AD (Mitsui Sumitomo Insurance Group). The company underwrites proportional and non-proportional reinsurance capacity across two main product lines: Property & Casualty (catastrophe treaties, per risk treaties, general liability, D&O and E&O, workers' compensation, medical professional liability) and Specialty Lines (Agriculture, Cyber, Financial Risks, Engineering, Complex Industrial and Corporate Risks). Distribution is conducted through three underwriting units — Americas, International, and Global Specialty Lines — with offices in Zurich, Bermuda, Miami, New York, London, and Labuan, allowing the company to serve cedants across North America, Latin America, EMEA, and Asia-Pacific.

The platform operates on a traditional reinsurance underwriting model, generating revenue through gross written premiums, with underwriting teams structured by client type to align expertise with client need. The company does not disclose proprietary technology or AI/ML product capability; its core technology is the non-life reinsurance underwriting platform itself, augmented by a recently hired Chief Information and Data Officer leading digital transformation. The company reports financial strength ratings of A+ (Stable) from both AM Best and S&P Global Ratings, with $3.9B in gross written premiums, $415M in net profit, and a combined ratio of 87.4% for 2025.

MS Reinsurance is a sales-led enterprise, distributing reinsurance through direct underwriting relationships with insurance companies. The company is led by CEO Robert Wiest, a former Swiss Re Reinsurance COO, and a leadership team staffed heavily with alumni from Swiss Re, Munich Re, PartnerRe, and AXA XL. Its go-to-market emphasizes a portfolio mindset, long-term through-cycle partnership, responsive service, and customized coverage rather than price-led competition; it has a strategic partnership with Envelop for cyber reinsurance and is actively deepening its Americas underwriting bench in 2026.

Name

MS Reinsurance

Legal name

MS Amlin AG

Website

https://msreinsurance.com

Company type

Private

Founded year

2023

Operating status

Operating

Headcount range

251–500 employees

Short description

MS Reinsurance is a Zurich-based global non-life treaty reinsurer and wholly-owned subsidiary of MS&AD, underwriting Property & Casualty and Specialty Lines capacity across the Americas, EMEA, and Asia-Pacific for insurance company clients.

Ownership category

akta.pro rank

Product category

Non-life Reinsurance

NAICS

Reinsurance Carriers (524130), Insurance Carriers and Related Activities (524)

SIC

Fire, Marine & Casualty Insurance (6331)

akta.pro primary industry

Casualty Treaty Reinsurance (FSAOAEAD)

akta.pro secondary industries

Catastrophe Treaty Reinsurance (FSAOAEAE), Financial Lines Treaty Reinsurance (e.g., D&O, E&O, professional liability) (FSAOAEAG), Professional Liability (E&O) Reinsurance (FSAOADAH), Construction / Engineering (CAR/EAR) Reinsurance (FSAOADAG)

Keywords

• Non-life reinsurance
• Treaty reinsurance solutions
• Property catastrophe reinsurance
• Specialty lines reinsurance
• Risk transfer services

Headquarters

HQ city

Zürich

HQ country

Switzerland

HQ region

Europe

Offices6 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Reinsurance Premiums: MS Reinsurance generates revenue through gross written premiums from non-life treaty reinsurance solutions. For the year ended 2025, gross written premiums grew to $3.9 billion from $3.6 billion in 2024.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

MS Reinsurance is a global non-life treaty reinsurer that provides proportional and non-proportional reinsurance capacity to insurance companies worldwide. The offering is organized into two product pillars — Property & Casualty Reinsurance (catastrophe treaties, per risk treaties, casualty lines including general liability, D&O/E&O, workers' compensation, and medical professional liability) and Specialty Lines Reinsurance (Agriculture, Cyber, Financial Risks, Engineering, and Complex Industrial and Corporate Risks) — delivered through three underwriting units (Americas, International, and Global Specialty Lines).

Product overview

MS Reinsurance is a global reinsurance company that provides non-life reinsurance solutions through two main product lines: Property & Casualty Reinsurance (covering catastrophe treaties, per risk treaties, proportional treaties, and casualty lines including general liability, D&O/E&O, workers compensation, and medical professional liability) and Specialty Lines Reinsurance (covering Agriculture, Cyber, Financial Risks, Engineering, and Complex Industrial and Corporate Risks). The company operates as a unified platform delivering tailored reinsurance capacity across Americas, International, and Global Specialty Lines business units, all supported by robust capacity and A+ ratings from both AM Best and S&P Global Ratings.

Differentiator

Problem solved

Functional benefit

Products and services

• Property & Casualty Reinsurance Non-life treaty reinsurance providing proportional and non-proportional capacity across a wide range of property and casualty risks, including catastrophe treaties, per risk treaties, proportional treaties for property, and casualty lines such as general liability, D&O and E&O liability, workers' compensation, and medical professional liability. Designed for insurance company cedents seeking reinsurance capacity and expertise across multiple lines of business.
• Specialty Lines Reinsurance Specialized non-life reinsurance solutions for unique and dynamic risks, covering Agriculture, Cyber (delivered in partnership with Envelop), Financial Risks, Engineering, and Complex Industrial and Corporate Risks. Targeted at insurance company cedents and corporate risk pools needing specialized underwriting expertise, customization, and capacity that standard treaty markets do not provide.

Quantifiable outcome

• Improved combined ratio to 87.4% in 2025 from 88.7% in 2024
• +1 more outcomes

Segments4 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

One partnership is on record.

• EnvelopminorStrategic or Co-development PartnerMS Reinsurance has a strategic partnership with Envelop for cyber reinsurance offerings. This partnership enables the company to provide comprehensive cyber reinsurance protection to clients by combining Envelop's cyber expertise with MS Reinsurance's underwriting capabilities.

Scale indicators7 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• AXIS Capital: AXIS Capital operates AXIS Re as a global P&C and specialty treaty reinsurer, with significant overlap to MS Reinsurance's product offering. MS Reinsurance's CIDO Benedikt Schmid previously held senior IT roles at AXIS Re, and both serve comparable cedant panels across specialty and treaty P&C lines.
• PartnerRe: PartnerRe is a Bermuda-based global multi-line reinsurer owned by Exor. Former Group CUO Charles Goldie served five years at MS Re but has industry depth; Jörg Bruniecki previously headed Global Client and Broker Management at PartnerRe. Both write P&C and specialty treaty with comparable geographies.
• Everest Re: Everest Re is a Bermuda-listed global P&C reinsurer with strong North American treaty presence. Both companies share a comparable product profile (cat, per risk, casualty treaty) and compete for the same North American cedant relationships that MS Reinsurance targets through its Miami and New York underwriting offices.
• Munich Re: Munich Re is the second-largest global reinsurer and the dominant specialty reinsurance platform. MS Reinsurance's Group CUO Jörg Bruniecki previously held senior roles at Munich Re, and both companies write proportional and non-proportional P&C and specialty treaty business on a worldwide basis.
• SCOR: SCOR is a French-listed global reinsurer writing P&C and Life treaty business across the Americas, EMEA and APAC. MS Reinsurance's Chief Technical Underwriting Officer Louis de Segonzac was previously VP, Latin America and Caribbean at SCOR. Both target the same cedant client base for non-life treaty solutions.
• Hannover Re: Hannover Re is the third-largest global reinsurer and one of the most disciplined underwriters in P&C treaty. Both companies write a similar mix of property catastrophe, non-proportional, and specialty treaty business globally, and compete for cedant panel positions in the same markets MS Reinsurance serves.
• RenaissanceRe: RenaissanceRe is a Bermuda-based specialty reinsurer dominant in property catastrophe and increasingly expanding into specialty casualty. While its product mix skews more cat-heavy, it competes for the same proportional and non-proportional P&C treaty placements that MS Reinsurance underwrites through its Americas unit.
• Swiss Re: Swiss Re is the world's largest dedicated reinsurer, offering both P&C and life/health treaty reinsurance globally. MS Reinsurance's CEO Robert Wiest spent 30 years at Swiss Re, most recently as COO of the Reinsurance division, and several other senior team members are former Swiss Re executives. Both companies compete head-to-head for the same treaty cedant relationships.

Others

• Envelop: Envelop is a specialty managing underwriting agent focused on cyber insurance. MS Reinsurance has an exclusive strategic partnership with Envelop to provide cyber reinsurance capacity, making Envelop a meaningful ecosystem partner rather than a direct competitor, given the limited overlap with MS Re's broader P&C and specialty treaty book.

Broad incumbents

• Lloyd's of London: Lloyd's of London is a global insurance and reinsurance marketplace where many of MS Reinsurance's cedant clients place specialty and complex risk business. While not a direct competitor to MS Re's treaty book, Lloyd's syndicates compete for similar proportional and non-proportional treaty placements and serve as a meaningful distribution channel for specialty reinsurance.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/ms-reinsurance

Revenue estimate

Valuation estimate

Number of profiles

Profiles12 records

Subsidiaries2 records

Funding overview

Funding rounds

Investors

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

M&A

Investments

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

Frequently asked questions about MS Reinsurance