The May 4 fire killed five women, all nurses, including 31-year-old bride Neriza Fojas as they rode to a wedding party across the San Mateo-Hayward Bridge. They were trapped in the back seat of the modified Lincoln Town Car.
The suit names six companies, including Ford Motors, which manufactured the original town car and Limo Stop of San Mateo County which operated the vehicle.
Three other companies are being sued for the car's modifications and maintenance.
A three-month CHP investigation concluded the fatal limousine fire was caused by a failure of the vehicle's suspension system.