This Essay suggests that a discussion on insurance regulation should include a consideration of the effect reinsurance may have on the behavior of insurers. The Essay reviews the traditional types of reinsurance, and considers the ability of private reinsurance contracts to produce insurer action. This essay suggests if reinsurance is not included in a holistic examination of the field, its realities have the capacity to misdirect insurance regulatory assumptions. Moreover, reinsurance works as a source of independent and often unexamined contractual influence on insurer activity, and as a potential source of interference with regulatory proposals. Even though reinsurance is initiated by private contract, those contracts have the potential for regulatory effect sufficient to provide a positive answer to this Essay’s main query: may reinsurance correctly be termed a “silent regulator”?