40 ILCS 5/22A-112
The board shall have the authority to invest funds, subject to the requirements and restrictions set forth in Sections 1-109, 1-109.1, 1-109.2, 1-110, 1-111, 1-114 and 1-115 of this Code.
No bank or savings and loan association shall receive investment funds as permitted by this Section, unless it has complied with the requirements established pursuant to Section 6 of "An Act relating to certain investments of public funds by public agencies", approved July 23, 1943, as now or hereafter amended. The limitations set forth in such Section 6 shall be applicable only at the time of investment and shall not require the liquidation of any investment at any time.
The board shall have the authority to enter into such agreements and to execute such documents as it determines to be necessary to complete any investment transaction.
All investments shall be clearly held and accounted for to indicate ownership by the board. The board may direct the registration of securities in its own name or in the name of a nominee created for the express purpose of registration of securities by a national or state bank or trust company authorized to conduct a trust business in the State of Illinois.
Investments shall be carried at cost or at a value determined in accordance with generally accepted accounting principles and accounting procedures approved by the board.
The value of investments held by any pension fund, retirement system or education fund in one or more commingled investment accounts shall be determined in accordance with generally accepted accounting principles.
40 ILCS 5/22A-112