Square D Co., Palatine, Ill., may search for an additional emerging-markets manager as a result of a recent asset allocation study for its $850 million defined benefit plan, said Richard O Shannon, vice president and treasurer. The new mix is 50% U.S. equities, 25% domestic fixed income, 15% international equities and 10% emerging markets. The previous mix was 55% U.S. equities, 25% domestic fixed income, 15% international equities and 5% emerging markets. A decision is expected by December. Frank Russell assisted.