About us

Tamesis is a specialty excess of loss reinsurance business.

Tamesis history

Tamesis London commenced operations in January 2012 as a Managing General Agency (MGA) writing global specialty excess of loss reinsurance (RI) business.  In 2016, Tamesis Americas opened offices in New York and Miami to service North, Central and South America as well as Caribbean territories.

Tamesis capacity

Tamesis capacity is provided by Allianz and Tokio Marine Kiln.

Tamesis enables capacity providers the opportunity to participate in the global specialty treaty reinsurance market by partnering our underwriting expertise with their prescribed risk appetite.

Tamesis approach

Market Cycles and ‘Value at Risk’ is Key

To our brokers and clients, they value our skilled and experienced underwriting team, and our consistent approach to evaluating business.  Our differentiated, multi class, gross line underwriting proposition enables us to offer capacity to clients across a broad spectrum of insured classes as well as allowing provision of cover on a blended / composite basis.

The selective approach to underwriting permits increased deployment of capacity in classes where conditions are stronger and facilitates a rapid response to changes in market conditions and proper cycle management.

There is a strict focus on underwriting profit, return on capital, and a 'gross line' underwriting mentality.   We select risks offering the best value to the portfolio in terms of risk adjusted return, class or client.  This has been demonstrated by producing strong returns across the market cycle and “being underweight” to loss exposure during large catastrophe loss events.

Tamesis offers transparency, accountability, integrity, teamwork and consistency of approach.  This enables us to build long-standing, strong relationships with distributors and clients with our unique multi-class position facilitating flexibility and speed of response to changing market conditions.

Tamesis philosophy

  • to offer value based portfolio management, creating a franchise with few peers
  • avoids over-reliance on any single business area 
  • has an effective, pre-emptive and flexible approach to risk management
  • has a conservative, deterministic, top-down view to the aggregation of risk
  • utilises a strategy born of thirty years market experience assessing exposure and buying and designing reinsurance programs 

Meet Tamesis at:


1 Creechurch Place
T +44 (0)20 7337 9888

New York

Wall Street Plaza
88 Pine St. – Suite 2202
NYC, NY 10005
T: +1 (973) 631-7575


1221 Brickell Avenue - Suite 944
Miami, FL 33131
T: +1 480 454 6151