On May 24, 1875, the City's insurance companies joined together to organize and fund the Underwriters Fire Patrol. The UFP was like a fire department; it had its own firehouses, alarm system and firemen whose only task was salvage practices. The patrol worked at fires in conjunction with the SFFD. The insurance companies realized that if valuable items could be saved from fire damage that their business expenses could be controlled. Due to do the reduction of these expenses, their policy holders would not have to pay higher premiums. On this premise, the Underwriters Fire Patrol was organized.
The following companies are listed chronologically.