A form of proportional reinsurance in which the reinsurer assumes an agreed percentage of each insurance being reinsured and shares all premiums and losses accordingly with the reinsured. Quota share reinsurance is usually arranged to apply to the insurer's net retained account (i.e., after deducting all other reinsurance except perhaps excess of loss catastrophe reinsurance), but practice varies. A quota share reinsurer may be asked to assume a quota share of a gross account, paying its share of premium for other reinsurance protecting that gross account.