MSIG USA Appointed Oscar Aguilar to Lead E&S Property
The insurer has named industry veteran Oscar Aguilar to spearhead its new excess and surplus property division.
Updated on Sept. 29, 2026 in People
MSIG USA, a unit of Mitsui Sumitomo Insurance, has appointed Oscar Aguilar to serve as the head of its excess and surplus property business. In this newly created role, Aguilar will oversee the firm's underwriting strategy and overall portfolio performance.
Why it matters
The creation of this leadership role signals an expansion of the insurer's specialized property coverage capabilities. By tapping an industry veteran for this position, the company aims to solidify its strategic direction within the competitive property insurance sector.
Oscar Aguilar brings over two decades of industry experience, including a six-year tenure at Ironshore. He joins the firm after serving as senior vice president and national manager of major accounts property at Liberty Mutual.
The players
Oscar Aguilar
He is the newly appointed head of the excess and surplus property business at MSIG USA who brings extensive experience from past roles at Liberty Mutual and Ironshore.
MSIG USA
This is a unit of Mitsui Sumitomo Insurance that provides insurance products and has recently expanded its organizational structure to include a dedicated excess and surplus property division.
The details
Aguilar will be based in Vallejo, California, as he assumes responsibility for the strategy and underwriting of the division. His professional background includes previous roles at Brit Insurance, Maiden Re North America, GMAC Re, SRO Napa, St. Paul Cos., and Sherwood Insurance.
Timeline
September 29, 2026: MSIG USA officially named Oscar Aguilar to the new executive role.
Market Landscape
The appointment reflects a broader industry shift toward specialized underwriting as insurance companies build out internal expertise to manage complex property risks. This move positions MSIG USA to capture increased market share by leveraging executive talent with deep national account experience.
For brokers and clients in the property insurance market, this leadership change may result in updated underwriting processes and new coverage options. The addition of a dedicated head of excess and surplus property suggests an increased focus on product availability for commercial accounts.
The takeaway
The move highlights the importance of deep, technical leadership when launching new specialized insurance divisions. As insurers adjust their portfolios to meet changing risk profiles, having experienced oversight remains a key factor for maintaining long-term portfolio stability.
Further reading
For more information on executive movements and industry leadership, visit the People section.
