The Tacoma (Wash.) City Council yesterday approved a $25 million investment in Russell Investment Groups Composite Select Holdings strategy for the Tacoma Employees Retirement System, Patricia F. Pabst, director of the $1.3 billion system, said in an e-mail. The strategy screens securities in the Russell U.S. Equity Fund, based on the number of managers that overweight them, and to what degree. Funding will come from reducing an active, domestic midcap growth portfolio managed by Denver Investment Advisors. Denver will still managed $72 million for the system. The change was made to further diversify the plan, Ms. Pabst said.