Section 746.145 - Workers' compensation insurance; combination of group of employers; purpose; conditions(1) Notwithstanding ORS 737.600, but subject to all other rate filing requirements of ORS chapter 737, an insurer may combine for dividend purposes the experience of a group of employers covered for workers' compensation insurance by the insurer, subject to applicable rules adopted by the Director of the Department of Consumer and Business Services, if: (a) All the employers in the group are members of an organization.(b) The employers in the group constitute at least 50 percent of the employers in the organization, unless the number of covered workers in the group exceeds 500, in which case the employers in the group must constitute at least 25 percent of the employers in the organization.(c) The grouping of employers is likely to substantially improve accident prevention, claims handling for the employers and reduce expenses.(2) This section does not apply to an organization of employers for which organization a workers' compensation policy was lawfully issued before October 4, 1977. The policy required by ORS 656.419 shall contain for each employer covered thereby the information required by ORS 656.419(2). When an employer becomes an insured member of the organization the insurer shall, within 30 days after the date insured membership commenced, file a notice thereof with the director. 1977 c.405 §3; 1983 c.706 §3; 1990 c.1 §5; 2003 c. 170, § 11; 2007 c. 241, § 29