Mo. Rev. Stat. § 379.1940: Indemnification claim, contribution against.

A motor vehicle insurer that defends or indemnifies a claim against a shared vehicle that is excluded under the terms of its policy shall have the right to seek recovery against the motor vehicle insurer of the peer-to-peer car-sharing program if the claim is:

(1) Made against the shared vehicle owner or the shared vehicle driver for loss or injury that occurs during the car-sharing period; and

(2) Excluded under the terms of its policy.