215 ILCS 5/378
This article shall apply to all companies authorized in this State to transact the kind or kinds of business enumerated in Class 2 of section 4.
Every such company shall, at all times, maintain reserves in an amount estimated in the aggregate to provide for the payment of all losses and claims incurred, whether reported or unreported, which are unpaid and for which such company may be liable, and to provide for the expenses of adjustment or settlement of such losses and claims. Such reserves shall be computed in accordance with regulations made from time to time by the Director after notice and hearing, upon reasonable consideration of the ascertained experience and the character of such kinds of business for the purpose of adequately protecting the insured and securing the solvency of such company.
Whenever the loss and loss expense experience of such company shows the reserves, calculated in accordance with such regulations, to be inadequate, the Director may require such company to maintain additional reserves.
Each company that writes liability or compensation policies shall include in the annual statement required by law, a schedule of its experience thereunder in such form as the Director may prescribe.
215 ILCS 5/378