Wyo. Stat. § 9-4-805

Instead of furnishing a surety bond as security for the deposits, a depository may pledge any bonds, debentures and other securities in which the state treasurer may by law invest and in an amount equal, at least, to the maximum amount of money at any time to be deposited with the bank or credit union. The bonds, debentures and other securities so pledged shall have a market value at least equal to the amount of the deposit. In addition, any depository may furnish as security for the deposit letters of credit issued by any Federal Home Loan Bank in such form as approved by the state treasurer of Wyoming or pledge conventional first mortgages of Wyoming real estate and notes connected with the mortgages at a ratio of one and one-half to one (1.5:1) of the value of public funds secured by them. A pledge of collateral as security for the deposit of public funds shall be accompanied by a written assignment from the depository vesting legal title thereto to the state and by any other instruments required by the state treasurer. The assignment shall provide that the depository shall pay over deposited public funds and accrued interest thereon to the state treasurer, or his authorized deputy, upon check, order or demand in accordance with this article. The assignment shall also provide that the state has the authority, if the depository defaults, to sell all collateral necessary to realize the full amount of deposited public funds and interest accrued thereon. The interest on bonds, debentures and other securities, so pledged, when paid shall be remitted to the bank or credit union so pledging them, as long as it is not in default.