Seneca Insurance operates as a specialty property and casualty insurer within the Crum & Forster group, alongside a sister company, Seneca Specialty Insurance Company. The two underwriting companies offer specialty package, specialty solutions, inland marine, and excess and surplus lines property coverage, placing business on either an admitted or a non-admitted basis.

Seneca Express reads an incoming submission, pulls the reports an underwriter needs, and leaves pricing and customization to that underwriter. The carrier targets businesses with difficult-to-place risks, writing vacant property, labor unions, businesses in bankruptcy, and energy exposures.