Oregon Revised Statutes Insurance § 750.317

(1) The powers of a multiple employer welfare arrangement, except as otherwise provided, must be exercised by a board of trustees chosen to carry out the purposes of the trust agreement. At least 50 percent of the trustees shall be persons who are covered under the multiple employer welfare arrangement. A trustee may not be an owner, officer or employee of a third party administrator who is licensed pursuant to ORS 744.700 to 744.740 and provides services to a multiple employer welfare arrangement.

(2) The trustees must give the attention and must exercise the vigilance, diligence, care and skill that prudent persons use in like or similar circumstances. Trustees are responsible for all operations of the multiple employer welfare arrangement and must take all necessary precautions to safeguard its assets.