Mo. Rev. Stat. § 285.1025: Employer immunity from liability, when.

An eligible employer, a participating employer, or other employer is not and shall not be liable for or bear responsibility for:

(1) An employee's decision as to which investments to choose;

(2) Participants' or the board's investment decisions;

(3) The administration, investment, investment returns, or investment performance of the plan including, but not limited to, any interest rate or other rate of return on any contribution or account balance, provided that the eligible employer, participating employer, or other employer is not involved in the administration or investment of the plan;

(4) The plan design or the benefits paid to participants; or

(5) Any loss, failure to realize any gain, or any other adverse consequences including, but not limited to, any adverse tax consequences or loss of favorable tax treatment, public assistance, or other benefits, incurred by any person solely and directly as a result of participating in the plan.