Chubb gave notice three months ago of its plan to stop participating in the NRA insurance program, known as "NRA Carry Guard," a Chubb spokesman said.
The Carry Guard program covers gun owners and their families facing legal costs related to firearm use, including self-defense shootings.
Chubb is at least the sixth company to cut ties the NRA this week. It joins Insurance company MetLife, as well as car rental companies National, Enterprise, Alamo, and Hertz.
First National Bank of Omaha also announced this week that it would end its contract to issue NRA-branded credit cards.
The announcements come amid heightened scrutiny of the NRA following last week's mass shooting at a Florida high school.