Since 1985, the First Security Bank of Utah common stock trust fund for employee benefits has earned a 13.1 percent return compounded annually, according to Robert A. Hatch, executive vice president and manager of the Trust Group at the bank.

In the past five years, the fund ranks 17th out of 500 co-mingled equity funds rated nationally by CDA Investment Technologies, an investment performance evaluation firm. In the peak-to-trough market from May 1990 to October 1990, the fund performance ranked 11th nationally.First Security banks manage more than $2 billion through First Security Investment Management, the corporation's investment management and advisory affiliate. Based on the fund's performance in the five years ending Dec. 31, 1990, FSIM ranked among the top quarter of the nation's money managers.