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Ironshore provides broker-sourced specialty commercial property and casualty coverages for varying risks located throughout the world. With more than 30 offices around the globe – including Ironshore’s Lloyd’s Pembroke Syndicate 4000 in London – Ironshore is prepared to meet clients’ complex needs promptly, with local service on a global basis and in-depth underwriting experience across a broad spectrum of industries.

Ironshore’s acquisition by Liberty Mutual and merger with Liberty International Underwriters (LIU) U.S. in 2017 enables us to bring even greater scale, expertise, innovation and product offerings to market. As a combined operation with approximately $2.9 billion in gross written premium, brokers now have access to a top-tier insurer with greater capacity and product lines for a wide range of risks.

Boston-based Liberty Mutual is a diversified insurer in business since 1912, offering a wide range of personal and commercial insurance products and services. Liberty has $125.6 billion in assets and ranks 68th on the Fortune 100 list of largest corporations in the U.S. based on 2016 revenue. As of December 31, 2016, Liberty Mutual had $38.3 billion in annual consolidated revenue, with ‘A’ ratings from both A.M. Best and Standard & Poor’s.

Competitive Advantages

Expertise &

Management averages 30 years of experience and is proven to navigate complex risks across industry sectors


Complete business coverage ranging from difficult-to-place risks to niche specialty products


Flexibility and creativity to not just meet, but anticipate, the needs of specific business challenges

Global Reach,
Local Presence

Offices worldwide to understand your needs and respond quickly on a local level

Strength &

Protection for the long haul, backed by industry icon Liberty Mutual Insurance and more than $125 billion in assets


A premier global commercial and specialty lines (re)insurer, seamlessly delivering innovative and comprehensive risk solutions that meet the unique needs of our customers

largest property
and casualty insurer
in the U.S.
largest commercial
lines writer
in the US
largest global property and casualty insurer
on the
US Fortune
100 list
largest excess and surplus insurer

Competitive Advantage

  • The Ironshore group of companies is rated A (Excellent) by A.M. Best and A (Stable) by Standard & Poor’s.
  • Ironshore’s U.S. companies carry a “g” modifier and Ironshore’s Irish company carries an “r” modifier from A.M. Best, which means all Ironshore subsidiaries carry the Financial Class Size XIV of the group. These modifiers are assigned to subsidiaries deemed integral to the group’s strategy and ongoing success and are fully integrated into the group’s strategic plan. To receive this rating enhancement, a stand-alone analysis was conducted to evaluate the individual subsidiary’s operating performance and capitalization.
  • Ironshore’s Lloyd’s Pembroke Syndicate 4000 operates within Lloyd’s where the market rating is A (Excellent) by A.M. Best,AA- (Very Strong) from Fitch and A+ (Strong) from Standard & Poor’s.