A. The state treasurer shall invest and reinvest trust and treasury monies in any of the following items:

1. 1. Obligations issued or guaranteed by the United States or any of its agencies, sponsored agencies, corporations, sponsored corporations or instrumentalities.
2. 2. Repurchase agreements collateralized with securities that are authorized for investment pursuant to state law and that are purchased from authorized counterparties that have adequate capital and liquidity as determined by the state treasurer.
3. 3. Bonds or other evidences of indebtedness of this state or any of the counties or incorporated cities, towns or duly organized school districts.
4. 4. Commercial paper whose issuer is investment grade for short-term obligations by any two nationally recognized statistical rating organizations.
5. 5. Bills of exchange or time drafts known as banker's acceptances that are drawn on and accepted by a commercial bank.
6. 6. Negotiable certificates of deposit issued by a nationally or state-chartered bank or savings and loan association.
7. 7. Bonds, debentures, notes or other evidences of indebtedness that are denominated in United States dollars and that carry an investment grade rating by a nationally recognized bond rating agency.

8. 8. Securities of or any other interests in any open-end or closed-end management type investment company or investment trust, including exchange traded products whose underlying investments are invested in securities allowed by state law, registered under the investment company act of 1940 (54 Stat. 789; 15 United States Code sections 80a-1 through 80a-64), as amended. For any treasurer investment pool that seeks to maintain a constant share price, both of the following apply:

   1. (a) The investment company or investment trust takes delivery of the collateral for any repurchase agreement either directly or through an authorized custodian.
   2. (b) The investment policy of the investment company or investment trust includes seeking to maintain a constant share price.
9. 9. Certificates of deferred property taxes as provided by section 42-17309.
10. 10. Treasurer's warrant notes issued pursuant to section 35-185.01 or registered warrants of a county issued pursuant to section 11-605, if the yield is equal to or greater than yields on eligible investment instruments of comparable maturities.
11. 11. Shares in the treasurer's local government investment pools pursuant to section 35-326 if investment policies of the pool seek to maintain a constant share price.
12. 12. Shares in the treasurer's long-term local government investment pools, the terms of which are determined by the state board of investment, pursuant to section 35-326.01.
13. 13. Subject to subsection D of this section, state transportation board funding obligations delivered pursuant to section 28-7678.
14. 14. Deposits placed in accordance with the procedures prescribed in section 35-323.01.
15. 15. Institutional common trust funds whose underlying investments are invested in securities allowed by state law.
16. 16. Program funding obligations delivered by the credit enhancement eligibility board pursuant to section 41-5857.

D. The state treasurer shall invest operating monies in state transportation board funding obligations delivered pursuant to section 28-7678 pursuant to the following:

1. 1. The state treasurer shall liquidate investments of operating monies if necessary to invest in state transportation board funding obligations, except that if operating monies in the state general fund fall below an $800,000,000 average over the previous twelve consecutive months, the state treasurer is not required to purchase state transportation board funding obligations pursuant to this subsection.
2. 2. Each series of state transportation board funding obligations shall bear interest at a fixed interest rate equal to the mean bid-ask price of the United States treasury obligation with a maturity date closest to the maturity date of the state transportation board funding obligation as determined by the pricing system used by the state treasurer before the date the state treasurer receives a certificate from the state transportation board that states the board's determination to deliver an obligation to the state treasurer and the anticipated delivery date of the obligation. The delivery date shall be between fifteen and sixty days after the day the state treasurer receives the certificate.
3. 3. The state treasurer shall notify the state transportation board and the director of the department of transportation in writing when the operating monies fall below $400,000,000. If operating monies fall below $200,000,000, the state treasurer may call the investment in the state transportation board funding obligations in $25,000,000 increments up to the amount that the operating monies are below $200,000,000. The state treasurer shall give the state transportation board and the director of the department of transportation at least fifteen days' notice of the call.