Mississippi Code Title 77. Public Utilities and Carriers § 77-5-247

All monies of a corporation from whatever source derived, shall be deposited or prudently invested in one or more banks, trust companies, or financial institutions, as may be approved by the board of directors, and, if the corporation shall so require, each of such accounts shall be continuously secured by a pledge of direct obligations of the United States of America or of the State of Mississippi having an aggregate market value, exclusive of accrued interest, at all times at least equal to the balance on deposit in such account or accounts, or otherwise insured by the Federal Deposit Insurance Corporation by whatever mechanism the corporation's board may deem appropriate.

Such securities shall either be deposited with the corporation or held by a trustee or agent satisfactory to the corporation. In lieu of any such pledge or such securities, said deposits may be secured by a surety bond or bonds which shall be in form, sufficiency and substance satisfactory to the corporation.